Sejong the Great-class destroyer

The Sejong the Great-class destroyers, also known as KD-III, are guided missile destroyers of the Republic of Korea Navy. The lead ship was launched 25 May 2007, sponsored by Kwon Yang-sook, the First Lady of the Republic of Korea at the time and was commissioned in December 2008. The second ship was commissioned in August 2010. As of 2010, the ROK Navy has committed itself to deploy three ships with an option for three more.


Sejong the Great-class destroyer
Class Ship
Type Destroyer
Manufacturer Hyundai Heavy Industries
Production Period 2007 - 2011
Origin South Korea
Country Name Origin Year
South Korea 2007
Country Name Operational Year Retirement Year
South Korea 2007 View
ManufacturerName Production From Production To Quantity
Daewoo Shipbuilding & Marine Engineering 2008 2010 1 View
Hyundai Heavy Industries 2007 2011 2 View

The Sejong the Great class is the third phase of the Republic of Korea Navy's Korean Destroyer eXperimental (KDX) program, a substantial shipbuilding program, which is geared toward enhancing ROKN's ability to successfully defend the maritime areas around Korea from various modes of threats as well as becoming a blue-water navy. At 8,500 tons standard displacement and 11,000 tons full load, the KDX-III Sejong the Great destroyers are by far the largest destroyers in the Republic of Korea Navy,[4] and built slightly bulkier and heavier than Arleigh Burke-class destroyers or Atago-class destroyers to accommodate 32 more missiles. KDX-III are currently the largest surface warfare ships to carry the Aegis combat system.

Ships in Class:

Name Number Builder Launched Commissioned Status
Sejong the Great DDG-991 Hyundai Heavy Industries 25 May, 2007 22 Dec, 2008 Active
Yulgok Yi I DDG-992 Daewoo Shipbuilding & Marine Engineering 14 Nov, 2008 31 Aug, 2010 Active
Seoae Ryu Seong-ryong DDG-993 Hyundai Heavy Industries 24 March, 2011 30 Aug, 2012 Active

Class overview
Builders: Hyundai Heavy Industries

Daewoo Shipbuilding & Marine Engineering
Operators: Republic of Korea Navy
Preceded by: Chungmugong Yi Sun-sin class
Cost: $923 million (per ship)
Planned: 6
Completed: 3
Active: 3

General characteristics
Class and type: Sejong the Great class destroyers
Displacement: 8,500 tons standard displacement

11,000 tons full load
Length: 165 m
Beam: 21.4 m
Draft: 6.25 m
Propulsion: 4 General Electric LM2500 COGAG;

two shafts,

100,000 total shaft horsepower (75 MW)
Speed: 30+ knots (56+ km/h)
Range: 5,500 nautical miles (10,200 km)
Complement: 300-400 crew members
Sensors and processing systems: AN/SPY-1D(V) multi-function radar

AN/SPG-62 fire control radar

DSQS-21BZ hull mounted sonar

MTeQ towed array sonar system

Sagem Infrared Search & Track (IRST) system
Electronic warfare and decoys: LIG Nex1 SLQ-200K Sonata electronic warfare suite[2]
Armament: 1 x 5 inch (127mm/L62) Mk-45 Mod 4 naval gun

1 x 30 mm Goalkeeper CIWS

1 x RAM Block 1 CIWS

4 x 4 SSM-700K Hae Sung anti-ship missiles

80-cell Mk 41 VLS

SM-2 Block IIIB/IV

48-cell K-VLS

32 x Hyunmoo III land attack cruise missiles

16 x K-ASROC Red Shark in (VLS)

2 x 3 K745 LW Blue Shark torpedoes
Aircraft carried: Hangar for two Super Lynx or SH-60 Seahawk, one more on landing pad

End notes