This articleneeds additional citations forverification. Please helpimprove this article byadding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Type 037 corvette" – news ·newspapers ·books ·scholar ·JSTOR(May 2024) (Learn how and when to remove this message)

TheType 037 corvette is a series 400–500 toncorvette type classes in service with thePeople's Liberation Army Navy. Unlike western navies, the People's Liberation Army Navy does not have dedicatedpatrol boats in its inventory. Instead, a large variety of corvette type classes, in the form ofmissile boats andsubmarine chasers fulfill the tasks of patrollingChina's territorial waters. TheEgyptian Navy operates eight vessels.

Hainan-class submarine chaser
Class overview
Name	Hainan class
Operators	People's Liberation Army Navy  Bangladesh Navy  Egyptian Navy  Korean People's Navy  Myanmar Navy  Pakistan Navy
Preceded by	Haizhui class
Succeeded by	type 056 / Jiangdao class
Built	1964–1982
In commission	1964–present
Completed	100+
Active	67 (PLAN)
Lost	1 (North Korean)
General characteristics
Type	Submarine chaser
Displacement	430 tonnes (420 long tons; 470 short tons)
Length	58.77 m (192 ft 10 in)
Beam	7.2 m (23 ft 7 in)
Draft	2.2 m (7 ft 3 in)
Propulsion	4 ×diesel engines, 8,800 hp (6,562 kW) 4 × shafts
Speed	30.5knots (56.5 km/h; 35.1 mph)
Range	2,000 nmi (3,700 km) at 14 knots (26 km/h; 16 mph)
Complement	70
Sensors & processing systems	1 ×Type 351 Radar "Pot Head" surface search radar 1 × Soviet Tamir-II hull mounted or SJD-3 telescoping high frequency active sonar
Armament	4 × Chinese Type 66 57 mm (2.2 in) guns (2×2) 4 × ChineseType 61 25 mm (0.98 in) guns (2×2) 4 ×RBU-1200 or Type 81ASW rocket launchers 2 × BMB-2ASWmortars 2 ×depth charge rails with more than 20 depth charges, and mine rails (10 mines total)

The Type 037 submarine chaser (NATO reporting name:Hainan class), is a class of submarine chaser of thePeople's Liberation Army Navy. It was designed by China to replace the Soviet S.O.-1 class submarine chaser.^[1]

In addition toanti-submarine warfare missions, these simple yet effective units are also capable of a wide variety of missions such asmine laying and patrol. These boats were first equipped with Soviet Tamir-11 (MG-11, NATO reporting name: Stag Hoof) hull-mountedsonars which had a typical range of 3 km (1.9 mi), but in the 1970s, they were superseded by domestic Chinese SJD-3 sonar, which is modification of original MG-11: instead of being fixed to the hull, SJD-3 has a telescoping arm, so when not in use, the sonar is stored in the hull, and when deployed, the sonar is lowered into water several meter below the hull, thus increased detection range by avoiding baffles generated by the hull.^{[citation needed]}

During theSino-South Vietnamese naval clashes on 19 January 1974, two boats of this class, # 281 & # 282 (two out of the eight total in Chinese inventory) participated in the latter half of the battle, the fastest Chinese units in the conflict. Originally the units were waiting atYongxing Island, but due to the problem of communications, they were not notified until the battle was already in progress.^{[citation needed]}

Over 100 were built, but as newer submarine chasers enter service, this class is steadily being decommissioned. A number of these ships have subsequently been exported toBangladesh,Egypt,North Korea,Pakistan andMyanmar.^[1] On October 13, 2013, a North Korean Type 037 was lost offWonsan with the loss of at least nineteen of her crew. She may have been in collision with anotherKorean People's Navy ship.^[2][3][4]

It is understood that four Type 037 submarine chasers were modified and became known as theType 037 Mod (NATO:Haijiu class).^{[citation needed]}

In PLAN service, pennant numbers as follows:601－610,622,625－629,639,650,673,674,677,681－687,689－692,694－696,698－709 and721－742^{[citation needed]}

Class overview
Operators	People's Liberation Army Navy
Preceded by	Type 037 (Hainan-class)
Succeeded by	Type 037I (Haiqing-class)
Completed	4
General characteristics
Type	Submarine chaser
Displacement	490 long tons (500 t)
Length	64 m (210 ft 0 in)
Beam	7.2 m (23 ft 7 in)
Draft	2.2 m (7 ft 3 in)
Propulsion	4 ×diesel engines, 8,800 hp (6,562 kW) 4 × shafts
Speed	28knots (52 km/h; 32 mph)
Range	750 nmi (1,390 km) at 18 knots (33 km/h; 21 mph)
Complement	72
Crew	70
Sensors & processing systems	I-band Pot Head surface search radar I-band Round Ball fire control radar Chinese copy of Thomson-Sintra medium frequency SS-12 VDS sonar
Armament	4 × Chinese Type 66 57 mm (2.2 in) guns (2 × 2) 2 ×AK-230 30 mm (1.2 in) AA guns 4 × RBU-1200ASWmortars 2 ×depth charge rails with 18 depth charges

TheHaijiu class submarine chasers are two (possibly four) modified versions of theHainan class submarine chasers (Type 037) of thePeople's Liberation Army Navy.

The main difference is that fourASW rocket launchers have replaced the original two ASW mortars. The biggest improvement, however, is in the sonar system. Original SJD-3 sonar on earlierType 037 class submarine chaser is replaced by a 13 kHz (2 frequency ranges) FrenchThomson Sintra SS-12/DIP 12 hull mounted (HM)/variable depth sonar (VDS). DIP 12, the VDS version weigh 4 tons and has a 200-meter cable with towing speed of 16 kn, and the range is selectable at 2, 4, 8 and 16 km respectively. However, during deployment, it was discovered that the endurance of this class is limited and the capabilities of SS/DIP 12 sonar system could not be fully exploited. There is some disagreement over the type designation of this class, some sources claim it isType 037I, while others claim it isType 037 Mod (for modified or modernized).

The Type 037I submarine chaser (NATO reporting name:Haiqing class), is a follow-on class of submarine chasers to the preceding Type 037-class of the People's Liberation Army Navy. There are two designations of this class, the baseType 037I and the improvedType 037IS. The earlier boats were built by the Qiuxin Shipyard ofShanghai, and later by Huangpu Shipyard.^{[citation needed]}

The ships are armed with two 6-tubed anti-submarine mortar launchers. The earlier boats are fitted with two manually operated twin-barrel 37 mm guns, but they have been replaced by two automatic 37 mm guns on the later variants. They also have various other mounted heavy machine guns for patrol duty. These weapons focus on a general-purpose patrol boat, with only a limited anti-submarine capability.^{[citation needed]}

One Haiqing class submarine chaser was purchased by theSri Lanka Navy and was commissioned in 1996 asSLNS Parakramabahu (P351), serving in theSri Lankan Civil War.^[5]

The Type 037IG missile boat (NATO:Houxin class) were first built by Qiuxing and Huangpu Shipyard from 1991 through 1999 for thePeople's Liberation Army Navy (PLAN). In addition to the PLAN, 6 were exported toMyanmar: 2 in 1995, 2 in July 1996, and 2 in late 1997. This boat is the anti-ship version of the Type 037 submarine chasers, armed with missiles rather than torpedoes. It was also used as a cheaper alternative to the Type 037II class.^[6]

According to the Office of Naval Intelligence, multiple Type 037IG missile boats were retired.^[7]

Class overview
Name	Houjian class
Operators	People's Liberation Army Navy  Pakistan Navy
Preceded by	Type 037IG (Houxin class)
Succeeded by	Type 022 missile boat
Subclasses	Azmat class
Built	1991–2001
In commission	1991–present
Planned	10
Building	1
Completed	9
Active	8
Retired	1
Preserved	1
General characteristics
Type	Missile boat
Displacement	520 tonnes
Propulsion	2 xSEMT-Pielstick 12 PA6 280 diesel engines at 1,584 hp (1,181 kW) with 3 shafts
Speed	30+ knots
Range	1,800 nmi (3,300 km; 2,100 mi) at 18 knots (33 km/h; 21 mph)
Crew	75
Sensors & processing systems	Type 348G tracking radar Type 348S search radar Type 765 (I-band)[11] Type 88C EOTS
Armament	1 xType 76 twin 37 mm naval gun (Only on Lianjiang) 2 xType 69 twin 30 mm[11] 6 xC-101/YJ-1[11]

The Type 037II missile boat (NATO:Houjian class) is a missile equipped corvette built by Huangpu Shipyard ofGuangzhou for thePeople's Liberation Army Navy. A total of six vessels were delivered to the PLA Navy and form the main naval defence force currently stationed inHong Kong.^[12]

The original one-off design was by an American company, the H-3 group, the design was for a 245-ton boat, equipped with Harpoon SSMs, OTO Melara 76 mm guns, gas turbine engines and waterjet propulsion. However, this specifications was too complicated for China, and a major redesign was begun, resulting in a boat with C-801 SSMs, diesel engines and propellers instead. The OTO Melara 76 mm gun was retained in the revised design, called in 1988 the EH-3D (and in 1996 the 520T), but failed to survive the cooling of relations with the West following theTiananmen Square protests of 1989 and the resulting end of Western participation in Chinese military projects.^{[citation needed]}

The first vessel was built in 1990, as a technology demonstrator and proof-of-concept trials vessel, it fired its first C-801 missile in a 1995 exercise. Three more vessels were built in 1995/96. However, due to technological difficulties (particularly with regards the license produced SEMT diesel engines), high price, and over sophisticated design compared to the PLAN standard, further production was terminated. A fifth vessel, hull number 774, was built in 2001, as another proof of concept vessel for modified SEMT engines with new turbochargers and license produced RussianAK-176 76 mm gun.^{[citation needed]}

Four vessels were built forrotation, with two vessels being deployed to Hong Kong at a time. The fifth vessel (Lianjiang (774)) has been involved in two navigation incidents. The first time in 2001 whilst on a pre-delivery test it was nearly sunk after a collision with a fast ferry servicing the Hong Kong-Guangzhou route. In June 2006, it collided again, this time with a Chinese freighter, and sank immediately, 13 servicemen going missing in the incident. The vessel was later refloated and sent to the shipyard for repair.^{[citation needed]}

The Type 037II's twin 30mm cannons are controlled by the Type 88CElectro-optical targeting system which has an infrared seeker and automatic tracker along with a laser rangefinder.^[12]

The Type 037II's tracking radar is theType 348G tracking radar while its search radar is theType 348S search radar.

TheAzmat-class vessels in service with the Pakistani Navy are based on this class.^[13] In 2012Bangladesh contracted for two slightly modified ships.^[14]

Ships in PLAN service:

Ships inPakistan Navy service:

• PNS Azmat
• PNSDehshat
• PNSHimmat

• Type 056 corvette
• Type 062 gunboat
• Ching Chiang-class patrol ship
• Cyclone-class patrol ship

• Missile boats of the PLAN (haijun360.com)
• Submarine chasers of the PLAN (haijun360.com)

• Corvettes of the People's Liberation Army Navy
• Missile boats of the People's Liberation Army Navy
• Missile boats of the Myanmar Navy
• Corvette classes
• Submarine chaser classes
• Missile boat classes

• CS1 Chinese-language sources (zh)
• Webarchive template wayback links
• Articles with short description
• Short description matches Wikidata
• Articles needing additional references from May 2024
• All articles needing additional references
• All articles with unsourced statements
• Articles with unsourced statements from January 2021
• Ship infoboxes without an image
• Pages using gadget WikiMiniAtlas
• All articles lacking reliable references
• Articles lacking reliable references from February 2025