GamingDiver / WoWs Legends Ships / Sejong

World of Warships: Legends ship guide

Sejong

Also called: 世宗 Beta

Pan-Asia · Tier VIII · CL Cruiser · Tech Tree: Destroyer-Cruisers

Smoke cruiserTrade DPM from smoke cover; reward steady fire over constant repositioning.

Playstyle

Anchor near your smoke cycle on a contested cap and trade DPM from inside the cloud
Avoid: Burning Torpedo Reload Booster on a hopeful salvo

Key characteristics

Long, fast torpedoes (12 km)High HE / fire outputStrong AALobs over islandsSmokeFragile

On this page

Community stats
Playstyle
How to get Sejong
Builds
Cohort position
Stats and specs
Armor
Charts
Balance history
Exteriors

Community Data

Sejong Community Stats

Log in to GamingDiver and upload your data to see Community Data for Sejong: community win rate, damage, survival, spotting, and your own comparison.

Playstyle

Overview

Sejong is a Tier VIII Pan-Asian light cruiser whose Smoke Generator lets her trade DPM from cover instead of from open water. The kit rewards static, sustained fire rather than rotation play. AA (672 AA DPS at 5.2 km, +100% Defensive AA flak burst) ranks 4 of 35 in T8 CAs: heavy enough to make a careless strike expensive, though not the umbrella that shuts a carrier out of her grid. Standout traits: best turret traverse rate in T8 CAs (40) and best HE DPM in T8 CAs (308,571).

Positioning

Anchor near your smoke cycle on a contested cap and trade DPM from inside the cloud. The kit rewards a static firing position; rotating mid-smoke wastes the consumable for the next contest. Your guns lose penetration at range, so aim AP at broadsides you can still citadel and put HE into superstructures and upper-hull sections, rather than the bow-in or belt armor your shells bounce and shatter on. Shooting from the cloud gives you away at 5.9 km, and a destroyer here is spotted at about 7 km, so you see it coming with roughly 1.1 km to spare. Vision is mutual: past the 2 km guaranteed ring you cannot see out either, and nothing in her kit sees through it, so pop the smoke where someone is already lighting the enemy or you will sit in it with nothing to shoot. Enemy sonar (about 4.7 km) and radar (about 9 km) read straight in regardless. She is genuinely evasive in both phases of a turn, answering the helm in 7.7 s and carving a 670 m circle, so you can break a salvo and still be where you meant to go.

Potato Avoidance

Burning Torpedo Reload Booster on a hopeful salvo These torpedoes ignore the Destroyer class

With only 2 charges it is a finisher rather than an opener: spend it on a target that cannot turn away, a broadside battleship or a cruiser already committed to its own attack, where the extra torpedo salvo lands as damage instead of splashes. A booster pressed on a maybe is one you will not have when the certainty shows up. Aim torpedo drops ONLY at battleships, carriers, and most cruisers; every torp fired at a DD is wasted output.

Signature Traits

Deep-water torpedoes

Torps IGNORE the Destroyer class (deep-water mechanic); they pass under DDs and cannot hit them. Aim ONLY at battleships, carriers, and most cruisers; every torp fired at a DD is wasted, unique in T8 CAs.

LOBBING BATTERY ↗

Fast turret traverse · 40°
HE DPM machine · 308571 HE
High-arc shells · 33.86°

Thick stern plate ↗

32 mm stern, best of T8 CAs.

MIXED ARMOR ↗

Weak torp belt · 0%
Thin armor · 95 mm

Acquisition

How to get Sejong

Sejong is available in the Destroyer-Cruisers branch of the Pan-Asia Tech Tree for 25,000,000 credits after researching it in the branch. Known module upgrades cost up to 6,250,000 credits. Official source cards below may also show its temporary Early Access window before it became a normal Tech Tree unlock.

Early AccessOfficial WG line/source notes indicate a temporary Early Access window before normal acquisition.

Show Pan-Asia tech-tree branch diagram

Pan-Asia Tech Tree

Sejong sits in the Destroyer-Cruisers branch. The highlighted path shows the local branch context inside the full Pan-Asia tree.

6 ships in highlighted branch · scroll to inspect all Pan-Asia lines.

Pan-AsiaIIIIIIIVVVIVIIVIII★

Destroyer

Cruiser

Tier ★JinanPZSC110 Tier VIIIChung MuPZSD109 Tier VIIISejongPZSC109 Tier VIIHsienyangPZSD108 Tier VIIHarbinPZSC108 Tier VIGadjah MadaPZSD107 Tier VIChumphonPZSC107 Tier VFushunPZSD106 Tier VRahmatPZSC106 Tier IVJianweiPZSD105 Tier IVChungkingPZSC105 Tier IIIShenyangPZSD104 Tier IIPhra RuangPZSD103 Tier IShi AnPZSC102

Official WG availability sources

Rabbit and Dragons: Lunar New Year and Early Access Pan-Asian Cruisers Early Access Start: 2023-01-31 · End: 2023-03-01 Official early-access or tech-tree-line article. Tech-tree ships are temporary crate drops during Early Access, then move to the Tech Tree.

Builds

Pair with a commander whose unique skill complements her main armament; check the build tool for current recommendations.

Open in Build Tool →

Have a build you swear by? Open it in the Build Tool and hit Save build to share it here.

Cohort position

Hide ▾

Where Sejong sits among Tier VIII CAs (34 ships). Notable standouts are shown first; the rest of the cohort-ranked stats are in the expand below. Acquisition variants (Black Friday, Founders Edition) are counted once with their base ship, not as separate peers.

BestTraverse-to-turn ratio26.74 × (1/35) BestHE DPM308,571 (1/29) BestEffective HE DPM (incl. fire)435,054 (1/29) BestFlak per wave (expected)3,402 (1/35) BestTorpedo reaction time4.4 s (1/21) BestStern armor32 mm (1/35) Top 10%Rudder shift7.7 s (3/35) Top 10%Turning circle670 m (3/35) Top 10%Main battery reload4.2 s (2/35) Top 10%Fires per minute15.43 (2/29) Top 10%AP arming threshold21 mm (3/34) Top 10%Displacement9,126 t (2/35) Top 10%Power-to-weight9.86 hp/t (4/35) Top 10%AA DPS672 (4/35) Top 10%Torpedo range12.5 km (3/21) Top 25%Max speed34 kt (9/35) Top 25%Stealth profile11.68 km / 7.36 km (5/35 / 8/35) Top 25%Smoke fire bloom5.9 km (5/35) Top 25%Main dispersion136.3 m (5/35) Top 25%Acceleration24.8 s (5/35) Top 25%AA threat2,543 (7/35) Top 25%Torpedo damage≈17,367 (6/21) Top 25%Torpedo speed67 kt (5/21) Bottom 25%HE velocity808 m/s (27/29) Bottom 25%AP fuse timer0.01 s (31/34) Bottom 25%Turn-speed retention134.3 hp/m (32/35) Bottom 25%Citadel belt95 mm (32/35) Bottom 25%Deck armor32 mm (29/34) Bottom 10%Hit points35,000 HP (33/35) Bottom 10%Main battery range14.97 km (34/35) Bottom 10%Engine power90,000 hp (33/35) WorstMain battery caliber127 mm (35/35) WorstAP shell damage2,100 (34/34) WorstNo secondaries (8 of 35 in cohort) WorstAP pen at 10 km57 mm (34/34) WorstRepair heal rate0.5 %/s (1 of 16 tied) WorstMax armor95 mm (35/35) WorstBow armor16 mm (1 of 6 tied)

See 9 mid-pack stats

Not standouts for Sejong -- here's where she sits on every other ranked stat in the cohort. Stats tagged NORM are tied across more than half the cohort, so the value is the cohort default rather than a standout.

Sigma2.05(17/35) AP DPM360,000(10/34) AP velocity808 m/s(25/34) AA range5.2 km(13/35) Torpedo reload110 s(16/21) NormAP ricochet start45°(25 of 34 tied at this value) NormAP auto-bounce angle60°(24 of 34 tied at this value) NormTurn speed retained81%(32 of 35 tied at this value) NormRepair charges2(33 of 35 tied at this value)

Peers in this cohort

Compare Tier VIII Cruisers

Show all 34 peers

Stats & specs

Customize in the Build Tool →

Survivability

Hit PointsInitial: 31,500 → 35,000

Displacement9,126 t

Hull dimensions

Length x beam at the waterline, with the hull's draft where the client carries one. Ships whose client entry holds only the 260 x 20 m placeholder use a curated real-world figure instead, and any ship we have no trustworthy size for omits this row rather than print the placeholder. Length matters when dodging torpedoes; beam and draft shape how hard the ship is to hit.

180.6 x 17.6 m

Armor range6–95 mm

Plate armor thicknesses6, 13, 16, 25, 32, 40, 75, 95 mm

Armor material/layer entries63

Fire resistance

Does not reduce the damage a burning fire does per second: replay-measured burn ticks run at the full rate on every ship. By elimination it lowers how often hits set you on fire; ignition-rate replay data is consistent with that but too confounded by attacker mix to measure the reduction directly.

40%

Fire duration30 s

Fire damage

Each fire ticks 0.3% of max HP per second for the full 30 s, so one unattended fire burns 9% of the pool (3,150 HP on this ship). 4 fire points can burn at once. Verified against measured burn ticks in replay data.

0.3% of HP per second

Flood duration40 s

Flood damage

A flood ticks 0.25% of max HP per second for the 40 s duration, so one unattended flood costs 10% of the pool (3,500 HP on this ship). Verified against measured flood ticks in replay data.

0.25% of HP per second

Torp Reduction

Reduces torpedo hit damage. Replay data shows no effect on floods: flood ticks run at the full rate and flood frequency does not decline with protection.

Magazine HP

Per-turret powder-magazine HP, a separate pool from the ship's. Penetrating hits wear it down and the turret is likelier to be knocked out as it falls, so a larger pool keeps the guns firing through punishment that silences a peer's.

17,500

Steering gear HP

Durability of the steering gears. As this pool drops, hits are likelier to jam the rudder; unlike most modules the steering can be knocked out and repaired but is never permanently destroyed.

10,500

Effective HP

Base 35,000 HP plus everything Repair Party can restore: 0.5%/s x 28 s = 4,900 HP per charge, x2 charges = 9,800 HP. Ceiling, not a prediction: a charge only restores damage actually taken, and only the regeneratable share of it. Across 1,826 players in our replay corpus the median ship realized about half of this, mostly because half the charges go unspent — when Repair Party IS pressed it returns ~97% of the per-charge figure above. Repair Party is one choice in its slot on this ship, so this applies only if you take it.

44,800

Repairable: penetration50%

Repairable: citadel50%

Repairable: steering gear50%

Main Battery

These main guns are dual-purpose: they also fire at aircraft and feed the AA Defense card.

ModuleArtillery: 127 mm/54 Mk.42

Mounts / barrels6 mounts / 12 barrels

Reload time

patched

baseline4.7
In-game data
2023-06-155.2
Ministry of Balance: Italian Concerto Main Battery reload time reduced from 5.5 to 5.2 s.
2026-07-304.7
Ministry of Balance: Anniversary Tune-Up Main battery reload time reduced from 5.2 to 4.7 seconds.

4.7 s

Firing range (base)13.6 km

Firing range (top fire control)15 km

Turret traverse40 °/s

Turret armor32 mm

Turret traverse arcs

How far each mount can train, in degrees to either side of the mount's own facing, read from in-game data. A rear turret with ±150° leaves a 60° blind wedge over the bow; one-sided arcs are wing mounts that cover a single side. The data does not say which way each mount faces, so the arcs are listed per mount without bow/stern angles.

3x ±145°, 3x ±144°

Guns to bear

How far off the bow (or stern) the ship must angle before every main turret can fire: the widest blind wedge among the rear-facing (or forward-facing) mounts, from each mount's trainable arc. Mount facing is inferred from turret stations and verified against known layouts, including Izumo's aft-facing forward turret.

36° off bow / 35° off stern

See the firing-arcs diagram ↓

HE fire DPM vs T8 BB113017

Effective HE DPM vs T8 BB388761

Shell Grouping (σ)2.05

Max Horiz Disp

Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:

σ_{H} = (\frac{R}{30} \cdot \frac{idealRadius - minRadius}{idealDistance} + minRadius) \cdot 30

= (\frac{14971}{30} \cdot \frac{8 - 1.1}{1000} + 1.1) \cdot 30 = 136.3 m

136.3 m at 15 km

Max Vert Disp

Vertical dispersion ellipse height at max range:

σ_{V} = σ_{H} \cdot radiusOnMax

= 136.3 \cdot 0.6 = 81.8 m

81.8 m at 15 km

Med Horiz Disp

50%-hit horizontal radius:

σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}

= 136.3 \cdot \frac{0.6}{2.05} = 39.9 m

39.9 m at 15 km

Med Vert Disp

50%-hit vertical radius:

σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}

= 81.8 \cdot \frac{0.6}{2.05} = 23.9 m

23.9 m at 15 km

Turret turn time

180 degrees / 40 deg/s traverse speed = 4.5 s.

4.5 s

Shells/min

Zero upgrades: 12 broadside guns x 60 / 4.7 s base reload = 153.2. All upgrades (Main Battery Mod. 3 = -10% reload): 12 broadside guns x 60 / 4.2 s all-upgrades reload = 171.4.

Initial: 153.2 → 171.4

HE shells

HE Damage1,800

HE Velocity808 m/s

Fire Chance9%

HE penetration

21 mm ≈ 127 mm caliber / 6 (standard HE penetration ratio).

21 mm

HE full-salvo alpha

1,800 HE damage x 12 broadside guns = 21,600.

21,600

HE DPM

Zero upgrades: 21,600 HE full-salvo alpha x 60 / 4.7 s base reload = 275,745. All upgrades (Main Battery Mod. 3 = -10% reload): 21,600 HE full-salvo alpha x 60 / 4.2 s all-upgrades reload = 308,571.

Initial: 275,745 → 308,571

Fires/min

Zero upgrades: 153.2 shells/min x 9% fire chance = 13.79. All upgrades (Main Battery Mod. 3 = -10% reload): 171.4 shells/min x 9% fire chance = 15.43.

Initial: 13.79 → 15.43

AP shells

AP Damage2,100

AP Velocity808 m/s

Min Ricochet45 deg

Guaranteed Ricochet60 deg

Fuse Timer0.01 s

Fuse Threshold21 mm

AP overmatch

floor(127 mm caliber / 14.3) = 8 mm (AP auto-penetrates plating this thick or less).

8 mm

AP Pen Close

Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity:

P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v_{0}^{1.38}

= 10^{- 7} \cdot 1720 \cdot {31.75}^{0.69} \cdot {0.127}^{- 1.07} \cdot 808^{1.38} = 174.9 mm

. Matches the in-game spec card.

174.9 mm point-blank

AP Pen Far

Same formula at the ship's max firing range (15 km), where the shell has slowed to 284.1 m/s:

P = 10^{- 7} \cdot 1720 \cdot {31.75}^{0.69} \cdot {0.127}^{- 1.07} \cdot {284.1}^{1.38} = 41.3 mm

41.3 mm at 15 km

AP full-salvo alpha

2,100 AP damage x 12 broadside guns = 25,200.

25,200

AP DPM

Zero upgrades: 25,200 AP full-salvo alpha x 60 / 4.7 s base reload = 321,702. All upgrades (Main Battery Mod. 3 = -10% reload): 25,200 AP full-salvo alpha x 60 / 4.2 s all-upgrades reload = 360,000.

Initial: 321,702 → 360,000

AP AOE Radius

AP shell over-penetration splash radius; scales with shell mass. Wickes 102mm = 3, standard 152mm CL ~ 20, Iowa 406mm ~ 270, Yamato 460mm = 400, Incomparable 650mm = 550 (max). Larger value = bigger splash damage area when AP over-pens.

Torpedoes

ModuleTorpedoes: 533 mm Mk31

Launchers / tubes4 launchers × 4 tubes = 16 tubes

Reload time

Base reload of the top torpedo module (all-upgrades configuration); the stock module reloads in 125 s. In-game port tooltips additionally fold in your installed modernizations and commander effects - e.g. Torpedo Launchers Mod. 3 alone is x0.85:

110 \times 0.85 = 93.5

110 s

Projectile speed67 kt

Range12.5 km

Maximum simulated damage

Estimate of WG's in-game value; matches the in-game port screen within ±5%. Saturation: most targets only intersect one hull section, so the sim transfers ~1/3 of the warhead alpha (2/3 when the warhead blast >= 5000 and the burst reaches a second section). For this ship:

D_{sim} = α \cdot c = 52, 100 \cdot 0.333 = 17, 367

≈ 17,367

Maximum damage (ammunition)

The ammunition card's 'Maximum Damage' stat, exact: warhead alpha / 3 plus the blast addend. This is the per-torpedo number most references quote; the 'Maximum simulated damage' row above is WG's separate geometry-sim stat from the launcher spec panel.

18,567

Torpedo detectability0.8 km

Reaction time

How long a target has to dodge after your torpedo is spotted at its detectability range (lower means less warning):

t_{react} = \frac{0.8 km}{67 kt \times 2.6855} = 4.4 s

. The 2.6855 m/s-per-knot game-speed factor is calibrated from in-game measurement; the community's traditional 2.6 reads about 3% slower. Base value; commander torpedo-concealment skills lower it further. Community torpedo-reaction calculator by u/LorenDovah and u/The_ColorOutofSpace.

4.4 s

Flooding chance

Read straight from the game's own data: this torpedo carries a flooding-chance value of 3.68 per hit, shown as

3.68 \times 100 = 368 %

. Torpedo flood values above 100% are normal: in battle the base chance is scaled down by the target's torpedo protection (the Torp Reduction stat on its Survivability card) and any flood-resistance modifiers, so a value above 100% keeps flooding likely even through partial protection. Not shown on the in-game port screen.

368%

Torpedo launcher traverse25 °/s

Launch arcs140°, 139° per side

Torp Turn

Time to rotate the launchers 180 deg:

t_{turn} = \frac{180 °}{25 ° / s} = 7.2 s

7.2 s

Torp Arming210 m

Deep-Water TorpedoesYes

Per-side salvo damage

One side firing, all torpedoes hitting: per-side tubes x per-torpedo simulated damage = 8 x 17,367 = 138,936.

138,936

AA Defense

AA mount points28

Maximum AA range

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 3.5 km; dual-purpose mount auras extend it.

5.2 km

76.2 mm/50 Mk.33 (upgraded hull only)8×2 76mm

20 mm Oerlikon Mk20Initial: 6×2 → 20×2 20mm

40 mm/56 Bofors Mk.2 (stock hull only)8×4 40mm

20 mm Oerlikon Mk4 (stock hull only)14×1 20mm

Gunsmain battery (DP)

Continuous DPS

Effective DPS in in-game units (raw aura damage × 3.5 × hit probability, summed per contributing aura) - matches the Close-range AA DPS headline's currency. Includes 220 from dual-purpose main battery firing as AA in this range band.

220

Range5.2 km

Guns76.2 mm/50 Mk.33

Continuous DPS

Effective DPS: 78 raw aura damage × 3.5 × 0.9 hit probability = 246 - the same in-game units as the Close-range AA DPS headline.

246

Range4 km

Total DPS in Aura

Far 220 + Medium 246 = 466

466

Guns20 mm Oerlikon Mk20

Continuous DPS

Effective DPS: 69 raw aura damage × 3.5 × 0.85 hit probability = 205 - the same in-game units as the Close-range AA DPS headline.

Initial: 149 → 205

Range2 km

Total DPS in Aura

Far 220 + Medium 246 + Near 205 = 671

671

Bursts

Each ~2 s wave fires 3 quick salvos of 4 clouds ahead of the attacking squadron, plus 2 stray clouds farther out that appear off-beat between waves - up to 14 clouds per wave × 270 damage each. Planes that fly into a cloud take its damage; clouds dissipate before the next wave lands. Defensive AA Fire, where fitted, multiplies the salvo repeats within each wave.

3 salvos × 4 clouds + 2 outer

Cloud damage

Damage a plane takes for flying into one flak cloud, before any reductions.

270

Cloud spawn chance

Each cloud in the pattern rolls this chance to spawn, so waves average fewer clouds than the maximum. Often called flak 'hit chance', but spawned clouds always damage planes that fly into them - the roll is on spawning.

90%

Wave rate

A flak wave spawns roughly every 2 s - timed frame-by-frame from gameplay footage and consistent across ships.

every ~2 s

Fired by

Flak keeps firing while at least one main battery mount is operational - even losing every other AA mount does not stop it.

Main battery

Flak zone

The activation band: flak fires while attacking planes are inside it. Clouds are placed ahead of the planes' path, so bursts can land short of 2.5 km or past 5.2 km - once planes get inside the band, new waves stop. AA range bonuses push the outer edge out; the 2.5 km inner edge does not move.

2.5-5.2 km

See the AA layers diagram ↓

Maneuverability

Engine power90,000 hp

Maximum speed34 kt

Turning circle radius670 m

Rudder shift time7.7 s

Engine power-boost threshold7 kt

Engine spool-up time15.3 s

Reverse spool-up time7.7 s

Reverse speed

top speed / 4 + 4.9 = 34 / 4 + 4.9 = 13.4 kt. The community reverse-speed model from the WoWs ShipBuilder project, the same source as the acceleration model on this card. Base value; speed modifiers scale it. Not shown on the in-game card.

13.4 kt

Crash stop

Seconds from top speed to a dead stop after ordering full reverse: reverse power winds in over the reverse spool-up while water drag does most of the braking. Same community-model simulation as the acceleration times, using the ship's own reverse-power ratio from in-game data. The full curve is on the acceleration chart.

24.9 s

Engine boost threshold (reverse)

Speed below which the engine's built-in power boost applies in reverse. Matches the in-game maneuverability card's reverse threshold (Vampire II reads 10.5 here and the card shows 11; the card rounds half up).

10.2 kt

Acceleration 0-90%

Time to reach 90% of top speed (30.6 kt of 34 kt), from our in-house acceleration model.

24.8 s

Acceleration 0-99%

Time to reach 99% of top speed (33.7 kt of 34 kt). 99% rather than 100% because true top speed is asymptotic (thrust meets drag), so the last fraction of a knot is never quite gained.

40.1 s

Traverse-to-turn ratio

How many degrees the turret can swing for each degree the hull turns. Turn rate

ω_{hull} = \frac{180}{π} \cdot \frac{V_{max} (m/s)}{R_{turn}} = \frac{180}{π} \cdot \frac{34.0 \cdot 0.5144}{670} = 1.50 ° / s

, so

ratio = \frac{ω_{turret}}{ω_{hull}} = \frac{40}{1.50} = 26.7 \times

. Below 5 the turrets drag in a turning fight; 25+ keeps up with any rudder.

26.7× instant

See the full acceleration curve ↓

Concealment

Detectability by sea11.68 km

Detectability by air7.36 km

Smoke firing penalty5.9 km

Detect when firing (sea)

Equal to the ship's main battery range (never below base detectability): firing makes you visible to everyone you can reach. Matches the in-game 'Detect Firing Sea' value on all 8 unmodified captures, and range-modified captures track the modified range.

14.97 km

Detect when firing (air)

Air detectability plus the gun-firing bloom (2.54 km, which tracks main-battery caliber x 0.020). Matches the in-game 'Detect Firing Air' value on every captured ship.

9.9 km

Detect when on fire (sea)

Base sea detectability + 2.0 km while burning; matches the in-game 'Detect Fire Sea' value on every captured ship.

13.68 km

Detect when on fire (air)

Base air detectability + 3.0 km while burning; matches the in-game 'Detect Fire Air' value on every captured ship.

10.36 km

Guaranteed Detect2 km

✦

Consumables

Damage Control Party∞ charges · 60 s reload · 5 s active

Smoke Generator3 charges · 130 s reload · 30 s emit / 70 s cloud active · 450 m radius

Choose one

Repair Party2 charges · 80 s reload · 28 s active · 4,900 HP (14% of max HP) total heal (per charge)
ƒ
Heal per second (0.5%) x effective active time (28 s) = up to 14% of max HP restored per charge.
· 9,800 HP (28% of max HP) total heal (all charges)
ƒ
14% per charge x 2 charges = up to 28% of max HP if the whole Repair Party loadout is used.
· 175 HP/s (0.5% of max HP) heal per second
ƒ
0.5% of max HP (35,000 HP) per second = 175 HP/s. WoWS heals a flat percent of MAX HP each second, so this rate holds at any health level.

Defensive AA Fire3 charges · 140 s reload · 25 s active · ×2 flak burst boost
ƒ
Repeats the flak burst pattern ×2 within each wave - more clouds in the air over the wave, at the same spots.

Torpedo Reload Booster2 charges · 300 s reload · 1 s active · 8 s torpedo launchers reload time
ƒ
While active, torpedo tubes reload in this time instead of the full reload, letting you fire a second spread right after the first.

Module options (3)

Stats above use the fully-upgraded modules. These are the research-tree alternatives; trade-offs are flagged.

HullUpgrade

Hit points31,500 → 35,000
Rudder shift14 → 10 s
Close-range AA DPS111 → 147
Maximum AA range3.5 → 4 km

Fire controlUpgrade

Main battery range13,610 → 14,971 m

TorpedoesUpgrade

Range12 → 12.5 km
Reload125 → 110 s
Alpha damage50,100 → 52,100
Display damage16,700 → 17,367

See all derived stats

Show ▾

All values are ship base stats with modifications and upgrade changes denoted inline.

Numbers the spec table cannot show directly: alpha-strike math, DPM, dispersion, AP penetration. Click the formula chip on any row to reveal how it is calculated.

Main battery formulas

Shell Grouping (σ)2.05

Max Horiz Disp136.3 m at 15 km

Horizontal dispersion ellipse width at max range, from the verified WoWS dispersion model:  $σ_{H} = (\frac{R}{30} \cdot \frac{idealRadius - minRadius}{idealDistance} + minRadius) \cdot 30$   $= (\frac{14971}{30} \cdot \frac{8 - 1.1}{1000} + 1.1) \cdot 30 = 136.3 m$

Shell scatter width @ 5 km67.5 m

Horizontal scatter at a fixed 5 km, from the same verified dispersion model as the rows below - a knife-fight-range anchor comparable across ships.

Shell scatter width @ 10 km102 m

How wide your shells scatter at 10 km, from the same dispersion model as the max-range figure above. Picking a fixed range makes this number directly comparable from ship to ship: max-range dispersion makes a longer-range gun look worse even when it's tighter at any common range. The interactive Dispersion tab on the Charts card plots the full curve from 0 to max range.

Max Vert Disp81.8 m at 15 km

Vertical dispersion ellipse height at max range: $σ_{V} = σ_{H} \cdot radiusOnMax$ $= 136.3 \cdot 0.6 = 81.8 m$

Shell scatter height @ 10 km54.4 m

How tall the same scatter ellipse is at 10 km. Comparable from ship to ship for the same reason as the width value above. The height/width ratio is a piecewise-linear curve through three points from the ship's own dispersion data:  $radiusOnZero = 0.2$  at 0 m,  $radiusOnDelim = 0.5$  at  $delim \cdot R_{m a x} = 0.5 \cdot 14971 = 7486$  m, and  $radiusOnMax = 0.6$  at 14971 m. Above the kink:  $k = 0.5 + (0.6 - 0.5) \cdot \frac{10000 - 7486}{14971 - 7486} = 0.5336$ , so  $σ_{V} = σ_{H} \cdot k = 102 \cdot 0.5336 = 54.4 m$ .

Med Horiz Disp39.9 m at 15 km

50%-hit horizontal radius: $σ_{H, 50} = σ_{H} \cdot \frac{0.6}{σ}$ $= 136.3 \cdot \frac{0.6}{2.05} = 39.9 m$

Med Vert Disp23.9 m at 15 km

50%-hit vertical radius: $σ_{V, 50} = σ_{V} \cdot \frac{0.6}{σ}$ $= 81.8 \cdot \frac{0.6}{2.05} = 23.9 m$

Dispersion familyCruiser Disp.

Standard cruiser dispersion baseline.

AP Pen Close174.9 mm point-blank

Canonical community AP formula (jcw780/wows_shell), evaluated at muzzle velocity:  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v_{0}^{1.38}$   $= 10^{- 7} \cdot 1720 \cdot {31.75}^{0.69} \cdot {0.127}^{- 1.07} \cdot 808^{1.38} = 174.9 mm$ . Matches the in-game spec card.

AP Pen Far41.3 mm at 15 km

Same formula at the ship's max firing range (15 km), where the shell has slowed to 284.1 m/s:  $P = 10^{- 7} \cdot 1720 \cdot {31.75}^{0.69} \cdot {0.127}^{- 1.07} \cdot {284.1}^{1.38} = 41.3 mm$ .

AP pen 5 km98 mm

AP penetration at a fixed 5 km, read off the same PC-validated ballistic curve as AP Pen Close/Far: the shell's impact velocity at that range fed through the canonical community AP formula  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v^{1.38}$ . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.

AP pen 10 km57 mm

AP penetration at a fixed 10 km, read off the same PC-validated ballistic curve as AP Pen Close/Far: the shell's impact velocity at that range fed through the canonical community AP formula  $P = 10^{- 7} \cdot K \cdot m^{0.69} \cdot d^{- 1.07} \cdot v^{1.38}$ . Fixed anchors make ships directly comparable at the same fighting distance; the Charts card plots the full curve.

HE flight time @ 10 km7.02 s

How long an HE shell takes to reach a target at a fixed 10 km, from the same numerically integrated trajectory the Charts card plots. The shell slows under quadratic air drag,  $a_{drag} = k ρ v^{2}$ , where  $ρ$  is air density from a standard-atmosphere profile and  $k$  bundles the shell's drag coefficient, caliber and mass:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.347 \cdot {0.127}^{2}}{8 \cdot 31.75} = 6.92 \times 10^{- 5}$ . That runs from a 808 m/s muzzle velocity in 0.02 s steps under gravity 9.8 m/s² until the shell lands, then divides by 2.77: the game clock runs faster than real time, and that factor was measured against stopwatch runs in the Training Room. Lower is better, since a faster shell is harder to dodge and needs less lead.

AP flight time @ 10 km7.02 s

How long an AP shell takes to reach a target at a fixed 10 km, from the same numerically integrated trajectory the Charts card plots. The shell slows under quadratic air drag,  $a_{drag} = k ρ v^{2}$ , where  $ρ$  is air density from a standard-atmosphere profile and  $k$  bundles the shell's drag coefficient, caliber and mass:  $k = \frac{π C_{d} d^{2}}{8 m} = \frac{π \cdot 0.347 \cdot {0.127}^{2}}{8 \cdot 31.75} = 6.92 \times 10^{- 5}$ . That runs from a 808 m/s muzzle velocity in 0.02 s steps under gravity 9.8 m/s² until the shell lands, then divides by 2.77: the game clock runs faster than real time, and that factor was measured against stopwatch runs in the Training Room. Lower is better, since a faster shell is harder to dodge and needs less lead.

HE penetration21 mm

21 mm ≈ 127 mm caliber / 6 (standard HE penetration ratio).

AP overmatch8 mm

floor(127 mm caliber / 14.3) = 8 mm (AP auto-penetrates plating this thick or less).

AP AOE Radius15

AP shell over-penetration splash radius; scales with shell mass. Wickes 102mm = 3, standard 152mm CL ~ 20, Iowa 406mm ~ 270, Yamato 460mm = 400, Incomparable 650mm = 550 (max). Larger value = bigger splash damage area when AP over-pens.

Broadside guns used for alpha12

All 12 barrels bear on the broadside.

Turret turn time4.5 s

180 degrees / 40 deg/s traverse speed = 4.5 s.

HE full-salvo alpha21,600

1,800 HE damage x 12 broadside guns = 21,600.

AP full-salvo alpha25,200

2,100 AP damage x 12 broadside guns = 25,200.

HE DPMInitial: 275,745 → 308,571

Zero upgrades: 21,600 HE full-salvo alpha x 60 / 4.7 s base reload = 275,745. All upgrades (Main Battery Mod. 3 = -10% reload): 21,600 HE full-salvo alpha x 60 / 4.2 s all-upgrades reload = 308,571.

AP DPMInitial: 321,702 → 360,000

Zero upgrades: 25,200 AP full-salvo alpha x 60 / 4.7 s base reload = 321,702. All upgrades (Main Battery Mod. 3 = -10% reload): 25,200 AP full-salvo alpha x 60 / 4.2 s all-upgrades reload = 360,000.

Shells/minInitial: 153.2 → 171.4

Zero upgrades: 12 broadside guns x 60 / 4.7 s base reload = 153.2. All upgrades (Main Battery Mod. 3 = -10% reload): 12 broadside guns x 60 / 4.2 s all-upgrades reload = 171.4.

Fires/minInitial: 13.79 → 15.43

Zero upgrades: 153.2 shells/min x 9% fire chance = 13.79. All upgrades (Main Battery Mod. 3 = -10% reload): 171.4 shells/min x 9% fire chance = 15.43.

Torpedoes

Torpedo detectability0.8 km

Estimated torpedo reaction time4.4 s

detectability / (speed kt x 2.6855 game-speed factor, m/s per knot, calibrated from in-game measurement; the community's traditional 2.6 reads about 3% slower).

Torpedo speed67 kt

Travel time to max range69.5 s

range / (speed kt x 2.6855 game-speed factor, m/s per knot, calibrated from in-game measurement).

Torpedo module damage1,200

Per-torpedo module/blast damage parameter from in-game data. Most torpedoes carry 500 to 2,000; ships announced by WG as dealing increased module damage carry 9,000 to 12,000, so their hits knock out engines, rudders, and turrets far more often. Comparative figure; the exact module-HP conversion is not published.

Tube count16

4 launchers x 4 tubes.

Per-side salvo8 torpedoes

tube count / 2 (symmetric port/starboard launcher layout; common on cruisers and battleships with deck torpedoes).

Full-salvo damage277,872

All tubes hitting one target: tubes x per-torpedo simulated damage = 16 x 17,367 = 277,872.

Per-side salvo damage138,936

One side firing, all torpedoes hitting: per-side tubes x per-torpedo simulated damage = 8 x 17,367 = 138,936.

AA defense

AA DPS at max range221

Only families that reach 5.2 km contribute at the outer edge of the AA bubble. In-game families: 3in50 Twin Mark 33 8x2 -> 246 DPS @ 4 km; 20mm Oerlikon MK20 Twin 20x2 -> 205 DPS @ 2 km; Far AA (?) -> 221 DPS @ 5.2 km.

Maximum AA range5.2 km

Longest-reaching family on the in-game AA card. Base AirDefense aura max range is 3.5 km; dual-purpose mount auras extend it.

AA DPS layered by range221 DPS @ 5.2 km, 467 DPS @ 4 km, 672 DPS @ 2 km

Cumulative AA DPS at each family range threshold. Inner ranges stack the outer families, so a target closing the distance hits stronger AA bubbles as it crosses each band.

AA DPS at point-blank672

Sum of every family's average DPS, achievable only inside the closest-range family (2 km).

AA threat index2543

SUM over AA auras of (aura DPS x aura range km). A plane crossing the AA bubble is exposed to each aura for a time proportional to that aura's range, so long-reach DPS is worth more than the same DPS in a short bubble. Units: DPS*km; used to rank overall AA threat across the cohort.

Near aura range2 km

Armor Beta

Hull HP 31,500 → 35,000 with hull upgrade, distributed across 5 hull zones, each with its own plate thicknesses, saturation cap, and pen thresholds. HP caps are the exact in-game values, not estimated.

Bow & stern16 mm

Overmatched by 139+ AP guns across the bracket. Can’t reliably bow-tank; gets bow-citadelled and overpenned.

Belt / citadel95 mm

Thin belt: battleship AP citadels straight through it broadside. Rely on angle, speed and concealment, never sit flat.

Farming13 mm

Superstructure and extremities take HE pens and AP overpens from nearly any gun: steady chip damage. Fire resistance 40%, fires burn 30s. Range-by-range in the Compare tool →

Section	Plates	HP cap	Threats	Tactic
Bow	16 mm primary (range 16–40 mm)	1,000 (3% of HP)	Overmatched by 283mm+ AP (Scharnhorst '43, Schill)Angle bounces 203mm16 mm: HE pens from 127mm+	Bow-tank fits behind this exterior plate. Saturation is FAST here; the cap is often only a few thousand HP.
Hull (midship)	16 mm primary (range 16–95 mm)	26,300 (75% of HP)	Overmatched by 283mm+ AP (Scharnhorst '43, Schill)Angle bounces 203mm16 mm: HE pens from 127mm+	Largest HP pool. Citadel sits behind these plates; thinner deck and side plating absorb the rest.
Stern	32 mm primary (range 16–75 mm)	1,900 (5% of HP)	Overmatched by 460mm+ AP (Aki, Musashi)Angle bounces 410mm32 mm: HE pens from 203mm+	Mirror of bow. Same fast saturation.
Citadel	95 mm primary (range 6–95 mm)	≈ 165,500 (effectively no cap)	Citadel pen: full damageOver-pen: ×0.10 damage	Effectively no cap; citadel pool sits at ~165k HP on every ship. An AP citadel penetration deals the shell's full damage, the biggest single hit available; only over-penetrations are damped, to ×0.10.
Superstructure	13 mm primary (range 13–32 mm)	no cap	Any HE ≥16 mm pens at full damage	Any HE ≥16 mm pens at full damage. HE-spam target, and the section saturates fast (often only a few thousand HP).
Turret (module, per magazine)	separate HP pool, does not drain ship HP	17,500 magazine HP	Turret knocked out	Per-turret powder-magazine HP, a separate pool that does not drain ship HP. As it is worn down the turret is likelier to be knocked out, and a smaller pool gets there faster.
AA mount (76 mm mount)	separate HP pool, does not drain ship HP	200 per-mount HP	Destroyed at 0 HP	Per-mount HP for the heaviest AA on this ship. An AA mount destroyed at 0 HP stops shooting down planes for the rest of the battle; DCP does not repair destroyed mounts. HE shells specifically target AA mounts since the small-caliber HP pool falls fast.
Rudder (module)	separate HP pool, does not drain ship HP	10,500 module HP	Incapacitated at 0 HP	When module HP reaches 0 the rudder locks at its current angle until DCP repairs it. Repair via Damage Control Party.

Saturation cap = HP a section can absorb before further damage to it is reduced (the "bow-tank" effect). Citadel pool is ~165k on every ship (effectively no cap); damage is gated by pen/over-pen multipliers instead. Superstructure saturates fast but HE always pens regardless of the plate thickness. Rudder (and other module HPs) are a separate pool from ship HP: damaging a module doesn't drain ship HP. Incapacitated modules like the rudder and engine are restored by DCP, but secondary and AA mounts destroyed at 0 HP stay out for the rest of the battle.

Open in Charting Tool

Ship Charts

Balance History

Balance updates affecting Sejong. Cards are condensed; use each source link for full context.

Nerf ×11Buff ×23Main Battery ×4Torpedo ×1Concealment ×14

2026-07-30

Ministry of Balance: Anniversary Tune-Up

Maximum speed increased from 33.0 to 34.0 knots.
Main battery reload time reduced from 5.2 to 4.7 seconds.
Stock torpedo reload time reduced from 139 to 125 seconds.
Upgraded torpedo reload time reduced from 125 to 110 seconds.
Upgraded torpedo distance increased from 12 to 12.5 km.
credit earnings increased by 5.26%.

Read the full official post

2024-12-12

Ministry of Balance: Breaking the Ice

Super-light cruisers can struggle with their survivability, and Sejong is no exception. As a result, we're improving the HP and concealment for Sejong so she can continue being a stubborn thorn in the side of her enemies.
Detectability range for both stock and upgraded hull detectability range by sea reduced from 12.05 to 11.68 km.
Detectability range for both stock and upgraded hull detectability range by air reduced from 7.59 to 7.36.
Detectability range for both stock and upgraded hull detectability range by sea while firing in smoke reduced from 6.2 to 5.9 km.
Detectability range for both stock and upgraded hull stock hull total health increased from 29,600 to 31,500.
Detectability range for both stock and upgraded hull stock hull casemate HP increased from 3,500 to 3,700.
Detectability range for both stock and upgraded hull stock hull superstructure HP increased from 2,900 to 3,100.
Detectability range for both stock and upgraded hull stock hull stern HP increased from 1,600 to 1,700.
Detectability range for both stock and upgraded hull stock hull HP increased from 22,200 to 23,600.
Detectability range for both stock and upgraded hull stock hull steering gear HP increased from 8,900 to 9,500.
+4 more official change lines in the source post.

Read the full official post

2024-03-21

Ministry of Balance: Spring Changes

credit-earning rate reduced by 5%.

Read the full official post

2023-06-15

Ministry of Balance: Italian Concerto

Main Battery reload time reduced from 5.5 to 5.2 s.
Stock Hull HP increased from 28,800 to 29,600.
Bow HP increased from 800 to 900.
Casemate HP increased from 3,400 to 3,500.
Hull HP increased from 21,600 to 22,200.
Magazine HP increased from 14,400 to 14,800.
Steering Gear HP increased from 8,600 to 8,900.
Upgraded Hull HP increased from 29,800 to 32,000.
Casemate HP increased from 3,500 to 3,700.
Superstructure HP increased from 2,900 to 3,200.
+4 more official change lines in the source post.

Read the full official post

Exteriors

Skins & permanent camouflages

Every custom exterior Sejong can equip, from in-game data.

DefaultThe ship’s standard exterior
The Four Elements
The Four Elements skin for SejongThe Four Elements

Primary official WG sources

Filtered to official World of Warships: Legends pages where this ship is a focus, reward, line member, or high-context variant mention.

2023-01-31 · Early access / tech tree line Rabbit and Dragons: Lunar New Year and Early Access Pan-Asian Cruisers Line source 2023-01-26 · Patch notes February Update: The Dragon Strikes Back Patch notes 2023-03-02 · Patch notes March Update: Seeing Green Patch notes 2024-12-12 · Patch notes Holiday Update: Glimpse Into the Future Patch notes 2026-07-30 · Patch notes Anniversary Update: Tides of Adventure Patch notes

Sejong

Sejong Community Stats

Sejong Community Stats

Playstyle

Overview

Positioning

Potato Avoidance

Signature Traits →

How to get Sejong

Builds

Cohort position

Peers in this cohort

Stats & specs

See all derived stats

Main battery formulas

Torpedoes

AA defense

Armor Beta

Ship Charts

Balance History

Ministry of Balance: Anniversary Tune-Up

Ministry of Balance: Breaking the Ice

Ministry of Balance: Spring Changes

Ministry of Balance: Italian Concerto

Skins & permanent camouflages

Primary official WG sources

Signature Traits