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Tier IXBattleship
JapanPremiumUncommonGlobal
JapanPremiumUncommonGlobalIwami B
WoWS World of Warships Japan Battleship · Tier IX
- Main Battery
- 410 mm/50 10th Year Type Mod.A in a twin-gun turret
- 4 turrets × 2 barrels
- Range 22.3 km
- Secondaries
- 155 mm HE Type0
- Secondaries
- 100 mm HE Type 98
- Range 6.95 km
- Torpedoes
- 610 mm Quad
- 2 launchers × 4 tubes
- Range 20 km
Specifications
Iwami B Win Rate & Combat Stats
Sample of 495.2K players · as of 2026-10-15ServerBattlesWin rateAvg damage
EUBattles 57,436
57.4K57,436
Win rate
49.79%
#44 of 62
Avg damage
68,270
#43 of 62
ASIABattles 32,546
32.5K32,546
Win rate
50.29%
#44 of 62
Avg damage
65,958
#49 of 62
NABattles 25,146
25.1K25,146
Win rate
49.51%
#44 of 62
Avg damage
64,893
#48 of 62
Averages from our own crawled player sample, not official server-wide data. The sample skews toward active clan players, so its overall win rate runs about 1 point above the true server average. Battle counts are career totals and include games played before this ship’s past balance changes.
Survivability
Hit Points80,700
#13 of 67
Group avg 72,934Flood Damage37%
Main Belt Armor356 mm
Deck Armor55 mm
Bow / Stern Armor32 mm
Ship Length255.2 m
Ship Width37.4 m
Main Battery
Main battery layout4×2(Total barrels 8)
Caliber410 mm
Firing Range22.3 km
#13 of 67
Group avg 20.6 kmReload Time28.0 s
Rotation Time35.0 s
Max Dispersion244 m
Sigma2.10
Shell Types
AP Shell
AP ShellDamage12,750
Shell Velocity834 m/s
Overmatch Threshold28.7 mm
Ricochet Angle45° / 60°
Normalization6°
Fuse Threshold68 mm
Air Drag0.34
Flight Time13.35 s
Nominal all-gun DPM218,571
#46 of 67
Group avg 239,019HE Shell
HE ShellDamage6,500
Shell Velocity834 m/s
Fire Chance30%
Penetration68 mm
Air Drag0.34
Flight Time13.37 s
Nominal all-gun DPM111,429
Torpedoes
Type 93
Type 93Torpedo Tubes2
Speed62 knots
Range20.0 km
#1 of 12
Group avg 13.0 kmDamage20,966
#2 of 12
Group avg 16,375Alpha Damage58,700
Splash Damage1,400
Flood Chance355%
Detectability2.50 km
Reload Time150.0 s
#10 of 12
Group avg 111.8 s180° Rotation7.2 s
Arming Time1 s
Spread Angle4.8° / 16°
Torpedo Caliber610 mm
Tube Module HP1,200
Fuse Depth0.14 m
Secondary Battery
Secondary Guns11
Range7.0 km
Sigma1.00
Max Dispersion259.4 m
Accuracy★★★★☆ Excellent
Total DPM661,000
100 mm HE Shell(8×2)
Damage1,700
HE Penetration30 mm
Fire Chance6%
Rate of Fire20 rpm
155 mm HE Shell(3×3)
Damage2,600
HE Penetration26 mm
Fire Chance10%
Rate of Fire5 rpm
AA Defense
Flak Bursts8
Flak Damage1,470
AA Ranges
Long range5.8 km203 dps
Short range2.5 km284 dps
Maneuverability
Max Speed28.2 knots
#50 of 67
Group avg 30.3 knotsTurning Radius880 m
#26 of 67
Group avg 893 mRudder Shift Time14.1 s
Engine Power145,000 hp
Displacement58,962 t
Power-to-Weight2.46 hp/t
Concealment
Max Surface Detection15.89 km
#29 of 67
Group avg 15.79 kmMin Surface Detection12.87 km
Air Detection10.00 km
Submarine Detection10.00 km
Detectability Firing in Smoke15.94 km
Consumables
Slot 1
Damage Control Party
Damage Control Party
Extinguishes fires, removes instances of flooding, and repairs damaged modules. Prevents enemy acoustic torpedoes from homing.
Reload80 s
Duration10 s
Charges∞
Slot 2
Repair Party
Repair Party
Partially restores the ship's HP by repairing any light damage.
Reload80 s
Duration28 s
Charges4
Heal Rate0.5%/s
Citadel10%
Non-Citadel50%
Armament
Depth Charge Airstrike
Depth Charge Airstrike
Carries out aerial bombardment of the marked area with depth charges. Depth charges can hit enemy submarines. They also have chances of causing fire, flooding, and incapacitating modules. Increased chances of incapacitating sonar. Effective against enemy mines. Cannot spot enemy ships.
Reload30 s
Charges2
Strike Range0.5–10.0 km
Planes8
Flights2
Bomb Damage4200
Fire Chance24%
Ballistics
Armor Model
Overview
One of the battleship projects developed in Japan in the mid-1930s. The ship was supposed to have four twin-gun main battery turrets. She had reinforced 100 mm dual-purpose artillery, improved anti-aircraft armament, and torpedo launchers.
Modules
410 mm/50 10th Year Type Mod.A in a twin turret
410 mm/50 10th Year Type Mod.A in a twin turret
Main Battery
Rate of Fire:2.1
Max AP Damage:12,750
Max HE Damage:6,500
Rotation Time:35s
Type90 mod. 1
Type90 mod. 1
Torpedoes
Range:0 km
Max Damage:20,966
Reload Time:0.4 knots
Torpedo Speed:62 knots
Iwami B.
Iwami B.
Hull
AA Guns:62
Main Guns:4
Secondary Guns:11
HP:80,700
Range:19-508
Torpedo Tubes:2
Propulsion: 145,000 hp
Propulsion: 145,000 hp
Engine
Max Speed:28.2 knots
Type9 mod. 1
Type9 mod. 1
Fire Control
Range:0 km
Upgrades
Slot 1
Auxiliary Armaments Modification 1
Auxiliary Armaments Modification 1
AA mount survivability: +100%
Secondary battery survivability: +100%
Main Armaments Modification 1
Main Armaments Modification 1
Risk of main battery becoming incapacitated: -20%
Main battery survivability: +50%
Main battery repair time: -20%
Risk of torpedo tubes becoming incapacitated: -20%
Torpedo tubes survivability: +50%
Torpedo tubes repair time: -20%
Damage Control Party Modification 1
Damage Control Party Modification 1
Consumable action time: +40%
Slot 2
Engine Room Protection
Engine Room Protection
Risk of steering gears becoming incapacitated: -20%
Steering gears repair time: -20%
Risk of engine becoming incapacitated: -20%
Engine repair time: -20%
Damage Control System Modification 1
Damage Control System Modification 1
Risk of catching fire: -5%
Risk of flooding: -3%
Slot 3
Torpedo Tubes Modification 1
Torpedo Tubes Modification 1
Risk of torpedo tubes becoming incapacitated: -40%
Torpedo tubes traverse speed: +20%
Torpedo speed: +5%
Aiming Systems Modification 1
Aiming Systems Modification 1
Maximum main battery shell dispersion: -7%
Maximum secondary battery shell dispersion: -5%
Secondary battery firing range: +5%
Torpedo tubes traverse speed: +20%
AA Guns Modification 1
AA Guns Modification 1
Priority AA sector preparation time: -20%
Secondary Battery Modification 1
Secondary Battery Modification 1
Maximum secondary battery shell dispersion: -20%
Secondary battery firing range: +20%
Main Battery Modification 2
Main Battery Modification 2
Main battery traverse speed: +15%
Slot 4
Airstrike Modification 1
Airstrike Modification 1
Airstrike aircraft HP: +25%
Airstrike armament reload time: -20%
Depth charge damage: +15%
Steering Gears Modification 1
Steering Gears Modification 1
Rudder shift time: -20%
Propulsion Modification 1
Propulsion Modification 1
Maximum reverse speed at full power: +140%
Time to reach full engine power when decelerating: -50%
Maximum forward speed at full power: +140%
Time to reach full engine power when accelerating: -50%
Damage Control System Modification 2
Damage Control System Modification 2
Fire extinguishing time: -15%
Flooding recovery time: -15%
Slot 5
Ship Consumables Modification 1
Ship Consumables Modification 1
Ship consumable action time: +10%
Concealment System Modification 1
Concealment System Modification 1
Squadron detectability range: -10%
Dispersion of shells fired by enemies attacking your ship: +5%
Ship's detectability range: -10%
Ship detectability for submarines when underwater: -10%
Torpedo Lookout System
Torpedo Lookout System
Assured acquisition range of torpedoes: 1.8km
Slot 6
Auxiliary Armaments Modification 2
Auxiliary Armaments Modification 2
Continuous AA damage: +15%
Damage from AA shell explosions: +15%
Number of explosions produced by AA defense salvos when the Defensive AA Fire consumable is active: +2
Secondary battery reload time: -20%
Gun Fire Control System Modification 2
Gun Fire Control System Modification 2
Main battery firing range: +16%
Torpedo Tubes Modification 2
Torpedo Tubes Modification 2
Risk of torpedo tubes becoming incapacitated: +50%
Torpedo tube reload time: -15%
Main Battery Modification 3
Main Battery Modification 3
Main battery traverse speed: -13%
Main battery reload time: -12%