Pohang-class corvette

The Pohang-class PCC (Patrol Combat Corvette) represents the lower-tier element of the high–low mix naval construction strategy developed by the Republic of Korea Navy under the 1st Yulgok Project (1974–1986) for the Republic of Korea Armed Forces. Initially, it was conceived as a Batch II continuation of the Donghae-class corvette. However, significant modifications to the overall design—most notably the adoption of the hull form used in the Ulsan-class frigate—led to its classification as a distinct class. These vessels were designed to conduct maritime patrol operations, including along the Northern Limit Line, safeguard coastal waters, and counter North Korean naval units.

Beginning in 1984, a total of 24 Pohang-class corvettes entered service with the Republic of Korea Navy. The retirement of the class started in 2009, with replacement ships being introduced under the FFX program. As of December 2025, two ships remain in active service, while eight have been transferred to foreign navies.

Originally, the Pohang-class was intended as an upgraded Batch II variant of the Donghae-class corvette. During the design phase of the Donghae-class, naval architects debated the optimal hull configuration. Captain Eom Do-jae, who was overseeing the construction of the Ulsan-class frigate at the time, advocated for a narrow V-shaped hull similar to that used on the Ulsan-class. In contrast, other designers, drawing from operational experience within the Republic of Korea Navy, argued that the Noryang-class PCEC offered an ideal size for mission requirements, while the Sinseong-class PCE—with its U-shaped hull—demonstrated superior stability at patrol speeds of 5 to 8 knots.

Another factor influencing the decision was that a V-shaped hull would necessitate the use of fin stabilizers. These were not favored due to prior issues encountered with similar systems on the Baekgu-class patrol gunboats. Consequently, the Navy opted for a U-shaped hull design for the Donghae-class to ensure stability without relying on fin stabilizers.

Captain Eom later convinced naval leadership to revise the hull design for the second production batch. The resulting hull closely resembled that of the Ulsan-class, and both internal and external structures underwent substantial redesign. Ultimately, these changes were extensive enough to justify reclassification into the Pohang class. Interestingly, the decision to install fin stabilizers was made only one month before the launch of ROKS Pohang, following feedback from ROKS Ulsan, which had been built without them. This late requirement forced rapid rearrangement of internal components under strict time constraints.

Compared to the Donghae-class, the Pohang-class is approximately 10 meters longer, 100 tons heavier, and capable of higher speeds—reaching a maximum of 32 knots due to an improved length-to-speed ratio. During sea trials, ROKS Pohang achieved speeds of up to 35 knots. Successful evaluation of fin stabilizers led to their installation on all ships of both the Pohang and Ulsan classes.

The propulsion system consists of one General Electric LM2500 gas turbine and two MTU Friedrichshafen 12V 956 TB82 diesel engines arranged in a combined diesel or gas (CODOG) configuration. This setup allows the 1,220-ton vessel to reach a top speed of 32 knots and maintain a cruising speed of 15 knots. The primary armament is optimized for surface warfare, particularly against numerous small North Korean vessels. Combat operations are managed through the Signaal SEWACO ZK combat management system, integrated with the Signaal WM28 fire-control system and radar, Raytheon AN/SPS-64 surface-search radar, and the Signaal LIOD optronic director. For anti-submarine warfare, the ship is equipped with an EDO 786 sonar and two triple Mark 32 torpedo tubes capable of launching Mark 46 torpedoes.

However, due to budget constraints, the class lacks an air-search radar and dedicated anti-aircraft weapon systems. This limitation became particularly notable in the global naval context following the Falklands War. As a result, the ships have only limited capability to defend against aerial and missile threats, relying mainly on the GoldStar ULQ-12K electronic support measures system and the Mk 36 SRBOC countermeasure system.

Throughout their construction and service life, the Pohang-class vessels underwent various upgrades and modifications. Sensitive systems such as ESM equipment are often removed prior to transfer to other countries, while certain components may be added depending on the receiving navy’s requirements.

Refit and modernization costs vary by operator. The Philippines reportedly spent approximately $4.8 million in 2019 for refurbishment, with South Korea covering dry dock work. Indonesian officials have indicated that upgrades to meet their service standards cost around $85 million in 2024.

Batch II – Four ships were constructed. This variant removed the twin Bofors 40 mm/60 gun and added two Aérospatiale MM38 Exocet anti-ship missile launchers.

Batch III – Four ships were built. This version significantly improved gun armament by adding an OTO Melara 76 mm/62 cannon and replacing the Emerson EMERLEC 30 twin 30 mm guns with Breda DARDO CIWS twin 40 mm/70 systems capable of engaging aircraft and cruise missiles. The sonar system was upgraded to the Raytheon AN/SQS-58, while the Exocet missiles were removed.

Batch IV – Ten ships were produced. This batch introduced major upgrades, including the WSA-423 combat management system developed jointly by Samsung Aerospace Industries (later Hanwha Systems) and the British company Ferranti. This system later formed the foundation of the Republic of Korea Navy’s Baseline 1.0 Integrated Combat Management System, known as “Naval Shield.” Its implementation caused delays due to its unproven nature. Additional upgrades included the Marconi S1810 fire-control radar and the Radamec 2400 optronic director, both localized by Samsung.

Batch V/VI – Six ships were constructed. These vessels featured structural differences from earlier batches and were equipped with the Samsung/Marconi ST1802 fire-control radar to enhance gunnery performance.