Sejong the Great vs Type 055
Sejong the Great vs Type 055 at a glance — displacement 10,000 vs 13,000 tons, length 166 vs 180 m, speed 30 vs 30 knots, crew 300 vs 300.
| Sejong the Great | Type 055 | |
|---|---|---|
| Origin | 🇰🇷 South Korea | 🇨🇳 China |
| Category | Destroyer | Destroyer |
| Type | Guided-missile destroyer | Guided-missile destroyer |
| Manufacturer | Hyundai Heavy Industries | Changxingdao-Jiangnan Shipyard |
| Year introduced | 2008 | 2020 |
| Number built | 4 units | 10 units |
| Estimated unit price | $923 million | $888 million |
| Displacement | 10,000 tons | 13,000 tons |
| Maximum speed | 30.0 knots | 30.0 knots |
| Range | 5,500 nm at 20 knots | 5,000 nm at 12 knots |
| Length | 166.0 m | 180.0 m |
| Beam | 21.4 m | 20.0 m |
| Crew | 300 | 300 |
| Sejong the Great | Type 055 | |
|---|---|---|
| Armament |
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| Propulsion | 4 × General Electric LM2500 COGAG; 2 × shafts; 100,000 shp (75,000 kW) produced power | COGAG 4 × QC-280 gas turbines (28 MW (38,000 hp) each) Total: 112 MW (150,000 shp) |
Detailed Comparison
South Korea's Sejong the Great-class (KDX-III) and China's Type 055 are the heaviest surface combatants produced in Asia, built for entirely different naval doctrines. Seoul scaled up the U.S. Arleigh Burke architecture to maximize magazine depth for localized ballistic missile defense against Pyongyang. Beijing designed a clean-sheet, 13,000-ton platform optimized to command carrier strike groups and project long-range anti-ship fires into the Pacific.
Development and Design
At 10,000 tons, the KDX-III utilizes a conventional, high-RCS superstructure. Batch I ships operate Aegis Baseline 7, while Batch II vessels—starting with Jeongjo the Great in 2024—upgrade to Baseline 9.C2 for integrated air and missile defense (IAMD). The program is constrained by cost; at $923 million per hull, only four are currently active.
The Type 055 weighs 13,000 tons and employs an enclosed forecastle, integrated mast, and flared hull to reduce radar and infrared signatures. Jiangnan and Dalian shipyards exploit economies of scale to produce the Type 055 for $888 million per unit, commissioning eight hulls between 2020 and 2022 with a second batch of eight under construction.
Weapons and Sensors
The Sejong the Great relies on the passive AN/SPY-1D(V) radar and segregates its 128-cell payload into two distinct systems:
- 80 Mk 41 cells reserved for U.S.-sourced SM-2 and SM-3 interceptors
- 48 K-VLS cells limited to domestic Hyunmoo land-attack and Red Shark ASW missiles
The Type 055 utilizes an active dual-band AESA radar (Type 346B S-band and X-band), increasing target resolution against low-flying or low-RCS threats. Its 112 universal GJB 5860-2006 VLS cells handle both hot and cold launches. While fielding 16 fewer cells than the KDX-III, the 055's larger vertical tubes accommodate the YJ-21 anti-ship ballistic missile, outranging the KDX-III's SSM-700K Haeseong.
Propulsion and Performance
The South Korean destroyer uses four General Electric LM2500 gas turbines yielding 100,000 shaft horsepower, achieving 30 knots and a 5,500 nm range at 20 knots. The Type 055 operates four QC-280 gas turbines generating 150,000 shp. This 50% increase in mechanical output powers the energy-intensive dual-band AESA arrays and provides excess capacity for future directed-energy weapon integration, though its endurance rating is slightly shorter at 5,000 nm at 12 knots.
Deployment and Combat Record
Sejong the Great operates primarily within the First Island Chain, focused heavily on radar tracking and regional air defense. The class proved its sensor capabilities by tracking the April 2009 North Korean Unha-2 rocket launch. By contrast, the Type 055 commands expeditionary formations. Nanchang deployed with the Liaoning carrier strike group in April 2021, operating in the Philippine Sea to validate its role as the air-defense node for PLAN blue-water operations.
Conclusion
In a localized ballistic missile defense scenario, the Sejong the Great wins. Its 128-cell capacity and Aegis Baseline 9.C2 integration provide a deep, proven magazine for intercepting incoming theater ballistic missiles via the SM-3. In a surface engagement or blue-water fleet action, the Type 055 defeats the KDX-III. Its dual-band AESA radar outpaces the aging SPY-1D(V) in target discrimination, its stealth-optimized hull delays detection, and the YJ-21 ASBM provides a standoff anti-ship strike range that the South Korean vessel cannot match or currently intercept.