Sejong

13.10

Cruiser | Pan-Asia | Tier IX

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IX

13,000,000

Sejong — Pan-Asian Tier IX cruiser.

CL-154 class cruisers were designed in the U.S. as a development of the Atlanta-class cruisers. They featured a larger hull and 5-inch guns. The new gun had a higher rate of fire, longer firing range, and heavier shells. Six ships even received their hull numbers, but construction was canceled due to cuts in the naval budget in 1945. Had they been completed, some of the cruisers might have been transferred to the Republic of Korea Navy, which in the 1950s and 60s acquired 42 warships of various types from the United States.

Modules

	Rate of Fire (shots/min)	180° Turn Time (sec)	Maximum Dispersion (m)	Maximum HE Shell Damage (HP)	Chance of Fire on Target Caused by HE Shell (%)	Maximum AP Shell Damage (HP)		Research price (exp)	Purchase price ()
127 mm/54 Mk.42 on a twin mount	13.3	4.5	127	1,800	9	2,100		0	1,300,000

	Hit Points (HP)	Armor (mm)	Armor (mm)	Main Turrets (pcs.)	Secondary Gun Turrets (pcs.)	AA Mounts (pcs.)	Torpedo Tubes (pcs.)	Hangar Capacity (pcs.)		Research price (exp)	Purchase price ()
Sejong (A)	28,800	6	95	6		14/6/8/6	4			0	1,950,000
Sejong (B)	29,800	6	95	6		20/8/6	4			48,000	3,000,000

	Rate of Fire (shots/min)	Torpedo Tubes Reload Time (sec)	180° Turn Time (sec)	Maximum Damage (HP)	Torpedo Speed (knot)	Torpedo Range (km)		Research price (exp)	Purchase price ()
Mark 17	0.5	125	7.2					0	1,300,000

	IDS_SHIP_PARAM_SUO_INCREASE_DIST (%)	Maximum Firing Range (km)		Research price (exp)	Purchase price ()
Mk9 mod. 1		0		0	1,300,000
Mk9 mod. 2		0		32,000	2,000,000

	Maximum Speed (knot)		Research price (exp)	Purchase price ()
Propulsion: 90,000 hp	33		0	1,300,000

Compatible Upgrades

Slot 1
Slot 2
Slot 3
Slot 4
Slot 5
Slot 6

Player Opinion

Performance

Warning: The data presented in the AA Defense sidebar section may be incorrect.
Refer to the in-game Port screens for more useful data.

At Tier IX, Sejong continues the HE and torpedo spam play style developed over the rest of the line. A variant of the American CL-154 project, Sejong shares many similarities with her American cousin X Austin and Pan Asian successor X Jinan, as well as other destroyer-caliber cruisers like VII Atlanta and Flint. Combining a fast-firing main battery and four heavy-hitting quadruple deepwater torpedo launchers with flexible Pan Asian smokescreens and a Torpedo Reload Booster, Sejong can stall capital ship pushes and quickly deal with destroyers that get too close.

Armament

Sejong is armed with twelve 127mm guns in six twin turrets, with similar characteristics to those found on Austin. But while Austin’s HE shells have similar stats, Sejong's lose speed more quickly due to higher drag, and thus have longer flight times and higher shell arcs. Her turret traverse and reload are among the fastest of any cruiser, but her small caliber limits the damage she can do to battleships and heavily armored cruisers. In those cases, she relies on superstructure hits and setting fires. Although her fire chance per shell is one of the lowest for Tier IX – only 9% – with twelve shells per salvo and a fast reload she can still set fires consistently. Sejong has AP shells, but their low penetration makes them ineffective at almost all ranges. In most situations, her HE shells will be the best choice. With her floaty shells, hitting longer range or agile targets can be a challenge. But her fast reload makes her a big threat to any destroyer that gets caught too close.

In addition to her main battery, Sejong carries two quadruple deepwater torpedo launchers per side. Like those found on the Pan Asian destroyer line, they have a low detection range but can’t hit destroyers. Sejong's are faster than those of any other Tier IX cruiser, with an excellent range as well as high damage and flood chance. They’re ideal for area denial or against isolated battleships and cruisers, as well as providing a painful deterrent against pushing ships if she has to run. With her torpedo reload booster, she can have up to 32 torpedoes in the water at the same time.

Consumables

Sejong features the standard consumable suite for high tier Pan Asian cruisers. In addition to the normal cruiser Repair Party and Damage Control Party, she has access to the Defensive AA Fire consumable, a Smokescreen with a relatively short cooldown period, and the Torpedo Reload Booster consumable. Unlike most other high tier cruisers, Sejong does not have access to the Hydroacoustic Search consumable, leaving her more vulnerable to enemy torpedoes.

Sejong's smokescreen consumable is identical to those found on the preceding cruisers. Like the Pan Asian destroyer smoke generator, it has a good action time and average dispersion time, but the downtime between one smokescreen expiring and the next being available is just 40 seconds. However, Sejong only has three charges compared to Chung Mu’s five.

While she doesn’t get the extended smoke times of US smokescreens, the shorter cooldown means less waiting for the next if she has to abandon a smokescreen early.

Maneuverability

Sejong is one of the most agile cruisers at Tier IX, with an excellent rudder shift and turning circle. Unlike the preceding ships, Sejong is one of the slowest in her tier. Although her handling is slightly worse than VIII Harbin, players familiar with the lower tier cruisers should still feel comfortable in Sejong.

If absolutely necessary, players can use her excellent agility to survive in the open. But her floaty shells, lack of health and armor, and slow speed make this a risky and less effective last resort if island or smoke cover is available.

Survivability

Like her predecessors, Sejong is the exact opposite of durable. She has the second smallest health pool of any Tier IX cruiser, and one of the lowest out of all Tier VIII to X cruisers. Sejong inherits Austin’s armor, including a 32mm main belt that can provide some protection against battleship AP and smaller caliber cruiser shells. However, she also shares Austin’s relative lack of armor elsewhere, with 16mm bow, stern, and deck plating and a vulnerable citadel that extends well above the waterline.

Sejong's excellent concealment also aids in her survival. When fully upgraded, her surface detection can get as low as 9.7km. Although some Tier VIII cruisers can still outspot her, she is one of the stealthiest cruisers at Tier IX or X. She can sneak around the map and get closer to a cap or move between island cover before getting spotted. Her low 5.5km smoke firing penalty also allows her to farm from smoke with less risk of enemy destroyers spotting her.

Players should not rely on Sejong’s health or armor to keep her alive. Staying undetected, along with a player’s ability to dodge incoming fire when spotted, will be her main sources of protection.

Anti-aircraft

As an anti-aircraft focused cruiser, Sejong has an impressive anti-aircraft suite to deter enemy planes. Although she doesn’t have the 6.9km reach of ships like IX Seattle or Neptune, her long range defenses and flak are still some of the strongest at Tier IX. Although Seattle’s flak deals slightly more damage per individual explosion, Sejong produces more flak per salvo than any other Tier IX cruiser. Her mid range defenses are below average for the tier, but in exchange they have some of the longest range. Although her close range defenses lack the extended reach of Dmitri Donskoi and Dalian, only Alaska’s deal more damage.

Like the other tech tree cruisers, Sejong mounts the Defensive AA Fire consumable by default, which can increase her defenses even further.

Her long range defenses and high flak count offer more than enough protection to deter attacking planes and cover nearby allied ships. A determined carrier will still be able to get a strike through, but it will be costly.

Battle performance

Just as with Austin, Flint, and other small caliber cruisers, Sejong prefers to play around island cover. With her high shell arcs, she can comfortably fire over her protective island armor to provide support in a cap or farm battleships. Her smokescreens allow her to produce an ‘island’ on demand if necessary, but her lack of hydro leaves her more vulnerable to incoming torpedoes.

Pros:

Fast main battery reload and turret traverse
Uses deepwater torpedoes, with high damage and low detection
Reasonably fast torpedo reload
Strong AA defenses, further boosted by the Defensive AA Fire  consumable
Very agile
Good concealment
Has access to the Smoke Generator  consumable
Has access to the Torpedo Reload Booster  consumable

Cons:

Very thin armor plating and vulnerable citadel
Very low health
Small main battery shell caliber, making it more difficult to damage capital ships
Slow shell velocity makes hitting targets at range more difficult
Deepwater torpedoes can’t hit destroyers
Lower top speed
Does not have access to the Hydroacoustic Search  consumable

Research

Availability of researchable upgrades for Sejong is as follows:

Hull: Upgrade to Sejong (B) for more health, improved maneuverability, and AA (see above for cost). Research of this module unlocks progression to Jinan.
Gun Fire Control System: Upgrade to Mk9 mod. 2 for an extra 10% range on the main battery.

Optimal Configuration

Upgrades

The recommended upgrades are:

Slot 1: Main Armaments Modification 1
Slot 2: Engine Room Protection or Defensive AA Fire Modification 1
Slot 3: Aiming Systems Modification 1 or Torpedo Tubes Modification 1 or Smoke Generator Modification 1
Slot 4: Propulsion Modification 1
Slot 5: Concealment System Modification 1 
Slot 6: Main Battery Modification 3 or Gun Fire Control System Modification 2

Slot 3 presents the biggest choice in defining Sejong's play style. Players that wish to boost her gun performance should select Aiming Systems Modification 1 or the coal Smoke Generator Modification 1 upgrade. Those that wish to play Sejong as a torpedo cruiser should instead select Torpedo Tubes Modification 1 to increase her torpedo speed and reduce the risk of her torpedo tubes getting knocked out or destroyed.

In slot 6, players can opt for Gun Fire Control System Modification 2 to increase Sejong's lackluster firing range. However, her floaty shells and long flight times will limit the usefulness of that extra range to farming battleships and stationary cruisers.

Commander Skills

Recommended Commander Skills
Cost (points)	Attack				Defense
1	Grease the Gears +15% main battery traverse speed.	Swift Fish +5% torpedo speed. ★★	Consumables Specialist −7.5% cooldown time of all Consumables except: Damage Control Party  Repair Party .	Gun Feeder -40% time to switch shell type.	Incoming Fire Alert Receive a warning of a salvo fired at your ship from more than 4.5km. ★★	Last Stand The ship remains able to move and maneuver - slowly - while the engine or steering gears are incapacitated. ★
2	Demolition Expert +1% chance of main and secondary HE shells causing a fire. +15% to the fragmentation damage area of HE ordnance fired at submarines. ★★★	Fill the Tubes -10% torpedo tubes reload time. ★★	Consumables Enhancements +10% action time of Hydroacoustic Search, Surveillance Radar, Smoke Generator, & Engine Boost.	Eye in the Sky Spotting Aircraft: • +2 charges • -50% cooldown time.	Priority Target The detection indicator will show the number of enemies targeting you with main battery. ★★	Focus Fire Training In an active priority AA sector: • +1.5% (to 5%) immediate damage. • +25% continuous damage. • +1 flak burst per salvo. −10% aircraft preparation time. −15% reload time of Airstrike armament..
3	Heavy HE and SAP Shells +10% HE and SAP shell damage. +15% ship detectability guns 149mm and up. ★★★	Pack a Punch +15% torpedo damage. +20% secondary battery range.. ★★	Adrenaline Rush -0.2% reload time of all armaments per 1% HP lost +0.2% AA continuous damage per 1% HP lost. ★★★	Heavy AP Shells +5% damage for AP shells 190mm and larger.	Superintendent +1 charge to all consumables. ★★★	Survivability Expert +450 HP per ship tier. ★★★
4	Top Grade Gunner -10% reload time of secondary batteries If enemy ship is spotted within detectability range, -8% reload time of main battery. ★	Outnumbered If there are fewer allies than visible enemies within the ship's base main caliber firing range: +8% ship speed -10% main battery dispersion.	Radio Location Shows the direction to the nearest enemy ship. The enemy is alerted that a bearing has been taken.. ★★	Inertial Fuse for HE Shells +25% armor penetration of HE shells Base fire chance reduced by half. ★	Concealment Expert -10% detectability range of the ship. ★★★	AAA & ASW Expert +25% continuous AA and flak damage. +15% damage inflicted by depth charges. While AAA is active: −50% ship consumables reload time..
Key: ★★★ - Extremely Useful ★★ - Frequently Useful ★ - Occasionally Useful No stars - Not Useful

Consumables

Sejong equips the following consumables:

Slot 1: Damage Control Party 
Slot 2: Smoke Generator 
Slot 3: Defensive AA Fire 
Slot 4: Torpedo Reload Booster 
Slot 5: Repair Party

Signals

Recommended Signal Flags
Combat
Juliet Charlie -100% to the risk of magazine detonation. ★★	Juliet Yankee Bissotwo -20% to flooding duration.	India Yankee -20% to fire duration. ★	Hotel Yankee -20% to damage received when ramming the enemy. +50% to damage dealt when ramming the enemy.	Victor Lima +1% chance for HE bombs and shells with a caliber above 160mm causing a fire. +0.5% chance for bombs and smaller shells causing a fire. +4% chance of torpedoes causing flooding. ★★★	India X-Ray +1% chance for HE bombs and shells with a caliber above 160mm causing a fire. +0.5% chance for bombs and smaller shells causing a fire. +5% to the risk of your ship's magazine detonating. ★★★
Juliet Whiskey Unaone +15% chance of causing flooding. +5% to the risk of your ship's magazine detonating. ★★	Mike Yankee Soxisix +5% to secondary battery maximum firing range. -5% to maximum dispersion of secondary battery shells. -5% to secondary battery loading time.	November Echo Setteseven +5% continuous AA damage at all ranges. +5% damage from flak bursts. ★★	Sierra Mike +5% to the ship's maximum speed. ★★	November Foxtrot -5% reload time on all consumables. ★★	India Delta +20% to the amount of HP recovered when Repair Party  is used. ★★★
X-Ray Papa Unaone +10% action time of a Smoke Generator . ★★	Sierra Bravo +10% action time of Hydroacoustic Search  -10% reload time of Defensive AA Fire . ★★

Note: Use of the Juliet Charlie signal makes detonation impossible.

Gallery

References

Ships of Pan-Asia

Destroyers	II Longjiang • III Phra Ruang • IV Shenyang • V Jianwei • VI Fushun • VI Anshan • VII Gadjah Mada • VIII Hsienyang • VIII Siliwangi • VIII Loyang • VIII Fenyang • VIII Loyang B • VIII Zhu Que • VIII Ship Smasha • IX Chung Mu • X Yueyang • X Lüshun • ★ Kunming
Cruisers	I Chengan • III Ning Hai • V Chungking • VI Rahmat • VI Huanghe • VII Chumphon • VIII Harbin • VIII Irian • VIII Wukong • IX Sejong • IX Dalian • IX Mengchong • IX Tianjin • X Jinan • X Incheon
Battleships	VII Teng She • IX Bajie • IX Wujing • IX Sun Yat-Sen • IX Louchuan • IX Xuan Wu
Aircraft Carriers	VIII Sanzang

Cruisers

Netherlands	I Van Kinsbergen • II Gelderland • III Java • IV De Ruyter • V Celebes • VI Kijkduin • VII Eendracht • VIII Haarlem • VIII De Zeven Provinciën • VIII Admiraal • VIII Statenland • IX Johan de Witt • IX Van Speijk • X Gouden Leeuw • X Prins van Oranje • X Vrijheid
U.S.A.	I Erie • II Chester • II Albany • III St. Louis • III Charleston • IV Phoenix • V Omaha • V Marblehead • V Marblehead Lima • V Rattlehead • VI [[Ship:Cleveland (< 31.05.2018)\|Cleveland (< 31.05.2018)]] • VI Pensacola • VI Dallas • VII Atlanta • VII [[Ship:Pensacola (< 31.05.2018)\|Pensacola (< 31.05.2018)]] • VII New Orleans • VII Helena • VII Indianapolis • VII Atlanta B • VII Boise • VII Flint • VIII [[Ship:New Orleans (< 31.05.2018)\|New Orleans (< 31.05.2018)]] • VIII Baltimore • VIII Cleveland • VIII Wichita • VIII Anchorage • VIII Congress • VIII Rochester • VIII San Diego • VIII AL Montpelier • IX [[Ship:Baltimore (< 31.05.2018)\|Baltimore (< 31.05.2018)]] • IX Buffalo • IX Seattle • IX Vallejo • IX Alaska • IX Tulsa • IX Alaska B • X Des Moines • X Worcester • X Puerto Rico • X Salem • X Austin • ★ Jacksonville • ★ Annapolis
Europe	I Gryf • VI Elli • X Svea
Germany	I Hermelin • II Dresden • II Emden • III Kolberg • IV Karlsruhe • V Königsberg • VI Nürnberg • VI Admiral Graf Spee • VI Leipzig • VI HSF Admiral Graf Spee • VII Yorck • VII München • VII Weimar • VIII Admiral Hipper • VIII Prinz Eugen • VIII Mainz • VIII Schill • VIII Mainz B • VIII Cross of Dorn • VIII Wiesbaden • IX Roon • IX Siegfried • IX Ägir • IX Admiral Schröder • IX Roon CLR • IX AL Ägir • X Hindenburg • X Hildebrand • X [[Ship:[Hindenburg]\|[Hindenburg]]] • ★ Clausewitz
U.S.S.R.	I Orlan • II Diana • II Diana Lima • II Novik • III Aurora • III Bogatyr • III Oleg • III Varyag • III AL Avrora • IV Svietlana • V Murmansk • V [[Ship:Kirov (< 10.06.2020)\|Kirov (< 10.06.2020)]] • V Kotovsky • V Krasny Krym • V Mikoyan • V Kirov • VI Budyonny • VI Molotov • VI Admiral Makarov • VII Shchors • VII Lazo • VII Lazo B • VIII Chapayev • VIII Tallinn • VIII Mikhail Kutuzov • VIII Ochakov • VIII Pyotr Bagration • VIII Bagration • VIII Dmitry Pozharsky • IX Dmitri Donskoi • IX Riga • IX Kronshtadt • IX Kozma Minin • X Moskva • X Alexander Nevsky • X Petropavlovsk • X Stalingrad • X Smolensk B • X Smolensk • X Sevastopol • X Komissar • X [[Ship:[Moskva]\|[Moskva]]] • X Vladimir Monomakh • X Petrozavodsk • ★ Novosibirsk
Italy	I Eritrea • II Nino Bixio • III Taranto • IV Alberto di Giussano • V Raimondo Montecuccoli • V Genova • VI Trento • VI Duca d'Aosta • VII Zara • VII Duca degli Abruzzi • VII Francesco Ferruccio • VII Gorizia • VIII Amalfi • IX Brindisi • IX Michelangelo • X Venezia • X Napoli • X Napoli B • X Ravenna • ★ Piemonte
Pan-America	I Hércules • II Almirante Barroso • II Almirante Abreu • III Vicente Guerrero • IV Córdoba • V La Argentina • VI Almirante Cochrane • VII Coronel Bolognesi • VII Nueve de Julio • VIII Ignacio Allende • VIII Almirante Grau • IX Santander • X San Martín
Japan	I Hashidate • II Chikuma • III Tenryū • III Katori • IV Yūbari • IV Kuma • IV Iwaki Alpha • V Furutaka • V Agano • V Yahagi • VI Aoba • VI Gokase • VII Myōkō • VII Omono • VII Tokachi • VII Maya • VII ARP Myōkō • VII ARP Ashigara • VII ARP Haguro • VII Southern Dragon • VII Eastern Dragon • VII ARP Nachi • VIII Mogami • VIII Tone • VIII Atago • VIII Shimanto • VIII Atago B • VIII ARP Takao • VIII ARP Maya • VIII Tone 2 • VIII Tone 3 • IX Ibuki • IX Takahashi • IX Azuma • IX AL Azuma • IX Chikuma II • IX Chikuma II Golden • IX BA Takahashi • X Zaō • X Yodo • X Yoshino • X Yoshino B • X Kitakami • X Yari • X Zaō CLR • X [[Ship:[Zaō]\|[Zaō]]]
U.K.	I Black Swan • II Weymouth • III Caledon • IV Danae • V Emerald • V Hawkins • V Exeter • VI Leander • VI Devonshire • VI London • VI Dido • VI Orion '44 • VII Fiji • VII Surrey • VII Belfast • VIII Edinburgh • VIII Albemarle • VIII Cheshire • VIII Tiger '59 • VIII Belfast '43 • VIII Hampshire • VIII Nottingham • VIII AL Cheshire • VIII STAR Edinburgh • IX Neptune • IX Drake • X Monmouth • X Minotaur • X Goliath • X Plymouth • X Gibraltar • X Defence • ★ Edgar
France	I Bougainville • II Jurien de la Gravière • III Friant • IV Duguay-Trouin • V Émile Bertin • VI La Galissonnière • VI De Grasse • VI Dupleix • VI Montcalm • VI [[Ship:[La Galissonnière]\|[La Galissonnière]]] • VII Algérie • VII Toulon • VIII Charles Martel • VIII Cherbourg • VIII Bayard • IX Saint-Louis • IX Brest • IX Carnot • X Henri IV • X Marseille • X Colbert • X Brennus • ★ Condé
Pan-Asia	I Chengan • III Ning Hai • V Chungking • VI Rahmat • VI Huanghe • VII Chumphon • VIII Harbin • VIII Irian • VIII Wukong • IX Sejong • IX Dalian • IX Mengchong • IX Tianjin • X Jinan • X Incheon
Spain	I Júpiter • II Méndez Núñez • III Navarra • IV Almirante Cervera • V Galicia • VI Baleares • VI Canarias • VII Asturias • VIII Cataluña • VIII Numancia • IX Andalucía • IX Almirante Oquendo • X Castilla
Commonwealth	I Sutlej • II Port Jackson • III Caradoc • IV Dunedin • V Delhi • VI Hobart • VI Perth • VI Mysore • VII Uganda • VIII Auckland • IX Encounter • IX Hector • X Cerberus • X Brisbane

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