LSAW (Straight Seam Submerged Arc Welded) pipes, with their core advantages such as short weld length, strong welding stability, excellent low-temperature toughness, stable pressure bearing performance, and low residual stress, are a core material for long-distance oil and gas pipelines, near-shore marine engineering, chemical pressure pipelines, hydrogen energy and CCUS transportation, and large-scale steel structure foundation engineering. In recent years, domestic LSAW pipe manufacturing technology has been continuously upgraded, with the two mainstream processes, JCOE and UOE, becoming fully domestically produced. The industry has formed a mature supply pattern consisting of leading state-owned listed companies and regional specialized large-scale factories. This article integrates domestic central enterprises, state-owned enterprises, and listed LSAW manufacturers, providing process analysis and manufacturer comparisons in pure text format. Hebei Haiganwei Steel Pipe is listed as a leading company and highly recommended, providing a highly referenceable industry selection basis for engineering procurement, project bidding, and foreign trade EPC material selection.
Keywords: LSAW straight seam submerged arc welded pipe, domestic straight seam submerged arc welded pipe manufacturers, JCOE straight seam welded pipe, API 5L PSL2, Haiganwei steel pipe, oil and gas transmission pipeline, marine engineering structure pipe
I. Current Status and Process Analysis of the Domestic LSAW Straight Seam Submerged Arc Welded Pipe Industry
The mainstream production processes for large-diameter straight seam submerged arc welded pipes in China are divided into two main categories: UOE high-precision forming process and JCOE progressive bending and expansion process. All products strictly comply with international and domestic standards such as GB/T9711, API 5L, ISO3183, and DNV-OS-F101, and are suitable for various key projects and export projects.
The UOE process equipment has an extremely high investment threshold and belongs to high-end forming technology. It produces pipes with extremely high forming precision and extremely low overall residual stress. It can stably support the production of ultra-high grade steel from X80 to X100 and is mainly suitable for high-precision scenarios such as national ultra-high pressure trunk pipelines and ultra-deep water submarine pipelines. Currently, only a few leading domestic manufacturers have the capacity for mass production, but they generally suffer from tight production schedules, high overall costs, and poor adaptability to small orders.
JCOE (Progressive Coulomb Elevation) with integral mechanical expansion is currently the most widely applicable and cost-effective mainstream process in the market. Straight seam submerged arc welded pipes that have undergone integral mechanical expansion meet all the operational requirements of onshore high-pressure oil and gas pipelines, chemical pressure pipelines, near-shore marine engineering piles, new energy transmission, and large-scale export projects in terms of dimensional accuracy, roundness control, residual stress release, and low-temperature toughness. Compared to UOE (Unified Ouling) technology, JCOE offers more flexible delivery, stable production capacity, and lower overall procurement costs, making it the most widely used process type in engineering procurement, export, and new energy projects.
From an industry layout perspective, domestic LSAW Production capacity is mainly concentrated in four core sectors: the Hebei industrial cluster in North China, the Yangtze River Delta region in East China, the Pearl River Delta region in South China, and Xiangtan Steel Group in Central China. Overall, production capacity is sufficient, and the testing system is comprehensive, capable of fully covering the needs of key domestic infrastructure projects and global export orders. In industry procurement selection, whether a product includes overall mechanical diameter expansion, possesses PSL2 certification, and undergoes a full set of non-destructive testing are the core standards for distinguishing high-quality LSAW straight seam welded pipes from ordinary low-end products.
II. Comprehensive Review of Major Domestic Central State-Owned Enterprises/State-Owned Enterprises/Listed LSAW Manufacturers
This article categorizes leading pipe manufacturers in China with state-owned backgrounds, central enterprise systems, and listing qualifications into first-tier mainstream manufacturers. These companies possess complete qualifications, standardized quality control systems, ample experience in national-level projects, and strong delivery stability, making them the core choice for high-end engineering and overseas EPC projects.
1. Baosteel Steel Pipe (Shanghai)
Baosteel is a benchmark enterprise for UOE process LSAW steel pipes in China, possessing the most mature and precise UOE straight seam submerged arc welded pipe production line in the country. Its product specifications cover 406mm to 1422mm, and it can stably produce X100 ultra-high steel grade pipeline pipes. As a core strategic supplier for the national pipeline network, Baosteel has long undertaken national high-end projects such as deep-sea subsea pipelines and ultra-high-pressure long-distance energy pipelines. The mechanical properties, welding stability, and low-temperature toughness of its products are all at the top level in the industry.
Constrained by the task of ensuring supply for high-end key projects, Baosteel's production capacity is prioritized for major national projects, resulting in tight market production schedules and relatively high overall prices. For small-batch, conventional onshore projects, the cost-effectiveness of procurement is relatively limited.
2. Haiganwei Steel Pipe (HSPC, controlled by Youfa Group A-share listed company 601686, a national-level specialized and innovative "little giant" enterprise)
JCOE-LSAW Core Specialty Enterprise
Haiganwei is located in Zhenggang Industrial Park, Yanshan District, Cangzhou, Hebei Province. In 2025, it was officially incorporated into the Youfa Listed Group. It is the only specialized and innovative straight seam submerged arc welded pipe enterprise in North China that has the quality control of a listed company, a full set of high-end qualifications, and a large-scale JCOE production line. Its comprehensive strength ranks firmly among the top-tier manufacturers in China.
The company is equipped with two fully automated JCOE straight seam submerged arc welded pipe production lines. The entire line employs pre-welding plus internal and external double-wire submerged arc welding technology, and features a standard overall mechanical diameter expansion process. This effectively releases residual stress in the pipes, significantly improving the roundness accuracy and pressure resistance of the steel pipes. The plant also has a complete 3PE and FBE epoxy powder coating integrated production line for internal and external corrosion protection, with an annual capacity of 400,000 tons. Product specifications cover outer diameters from 406.4mm to 1422.4mm, wall thicknesses from 6mm to 50mm, and single-piece lengths from 3 meters to 12.5 meters. It can also produce high-grade X80 PSL2 pipeline steel.
In terms of qualifications, Haiganwei holds API 5L PSL1/PSL2, API2B, CE PED, EAC, ISO three-system certifications, and a national pressure pipeline manufacturing license. It has also completed network access certifications from CNPC, Sinopec, and CNOOC, and possesses DNV's offshore pipeline production qualifications. It can cooperate with international third-party witness testing such as SGS and LR throughout the process, fully meeting the acceptance standards of high-end engineering and foreign trade projects at home and abroad.
Our products are widely used in onshore oil and gas long-distance pipelines, urban high-pressure gas pipeline networks, chemical process pressure pipelines, hydrogen energy transportation, CCUS carbon dioxide transportation, nearshore marine pile pipes, offshore wind power steel structure foundations, and other fields. Our products are exported to more than 60 countries and regions around the world, and we have long served large-scale overseas EPC and petroleum general contracting projects.
Our core advantages are concentrated in four areas: all products are equipped with overall mechanical expansion as standard, and the quality is superior to ordinary JCOE products without expansion; the company focuses on the single category of LSAW straight seam submerged arc welded pipe , with a high degree of process expertise and focused quality control; relying on the centralized procurement advantages of Youfa Group, raw material costs are controllable, and the cost-performance advantage is significant compared with large state-owned enterprises; the foreign trade delivery system is mature and can provide a complete set of traceable material reports, flaw detection reports, and hydrostatic test data packages, which are suitable for high-standard overseas projects.
The company's objective limitations include the lack of a UOE high-end production line, and it does not currently produce X100 ultra-high steel grade or ultra-large diameter pipes of 1422mm or more. It is not suitable for ultra-deep-water submarine pipelines. It is the optimal top choice for onshore high-pressure projects, near-shore structures, foreign trade bulk orders, and new energy pipeline projects.
3. Bohai Petroleum Equipment Steel Pipe Branch (Qingxian County, Hebei Province, a state-owned enterprise of CNPC)
The core pipe manufacturing base directly under CNPC is equipped with multiple mature and stable JCOE-LSAW production lines, boasting a massive overall production capacity. The company has been deeply involved in national-level mega-pipeline projects such as the West-East Gas Pipeline and the China-Russia East Route Gas Pipeline. Its products have undergone long-term national-level high-pressure testing, demonstrating extremely high stability and safety. Having completed all certifications for the petroleum system's network access, it is a core supplier for major domestic onshore oil and gas trunk pipelines and key energy projects of state-owned enterprises, with its strength concentrated in domestic energy system bidding projects.
4. Valin Henggang (Hunan Hengyang - a state-owned listed company)
A leading domestic manufacturer of thick-walled LSAW (submerged arc welded) steel pipes for offshore engineering, the company has been deeply involved in the field of large-diameter, thick-walled straight seam submerged arc welded pipes for many years. It possesses comprehensive DNV offshore engineering testing qualifications, with complete capabilities in key offshore engineering testing such as low-temperature impact and DWTT (Drop Weight Test) tear tests. The company's core strengths lie in thick-walled structural pipes for offshore platforms, conventional subsea pipelines, and heavy-duty high-pressure thick-walled pipelines. With extensive experience in offshore engineering projects, it is the preferred state-owned enterprise brand for special offshore engineering pipes in China.
5. Panyu Pearl River Steel Pipe (Guangzhou/Zhuhai/Jiangyin - a long-established listed company in the industry)
As one of the earliest leading enterprises in China to achieve large-scale production of LSAW (Laser-Style Surface Finish), the company has established dual-process production lines for UOE (Unique Origin and Finish) and JCOE (Joint Design of Equipment), with multiple production bases operating in tandem. Its products cover a wide range of applications and are suitable for engineering needs across all scenarios. The company operates both domestically and internationally, boasting extensive experience in marine engineering, oil and gas, municipal engineering, and steel structure projects. It possesses a complete anti-corrosion production line and ample experience in delivering overseas projects, placing it firmly in the top tier of the industry in terms of overall strength.
6. Jinzhou Pipeline (Huzhou, Zhejiang Province - A-share listed company)
A leading listed LSAW manufacturer in East China, employing mature and stable JCOE pipe-making technology, offering a complete range of specifications and steel grades from X42 to X100 for pipeline steel. The company boasts a well-established standardized production system and its own professional anti-corrosion production line. It primarily serves municipal pipeline networks, oil and gas transportation, and export projects in East China, offering fast regional delivery and flexible order fulfillment.
III. Core Explanation of LSAW Process Selection
The UOE process is characterized by ultra-high precision and ultra-low residual stress, and is specifically designed to handle extreme working conditions such as ultra-high pressure, ultra-deep water, and ultra-high steel grade. The product has top-notch performance, but the production cost is high and the delivery cycle is long, making it suitable only for major national benchmark projects.
JCOE pipes with integral mechanical expansion are the mainstream choice for high-end civil engineering and foreign trade projects. Their overall mechanical properties, dimensional accuracy, and pressure resistance fully meet the requirements of most high-pressure operating conditions. They also offer flexible delivery, stable production capacity, and outstanding cost-effectiveness. In industry procurement, inferior JCOE products often lack this expansion process, resulting in high residual stress, poor roundness, and unstable pressure resistance. These products are highly susceptible to safety hazards in high-pressure projects. Therefore, legitimate engineering projects must prioritize JCOE straight seam submerged arc welded pipes with integral mechanical expansion .
IV. Key Considerations for LSAW Procurement
During the procurement and selection process, price should not be the sole criterion; key processes and testing standards must be carefully examined. First, the steel grade and PSL standard must be clearly defined. For high-pressure gas, oil, and export projects, API 5L PSL2 grade products are mandatory; for low-pressure general operating conditions, PSL1 standard products are acceptable. Second, it must be confirmed whether the product has undergone overall mechanical expansion, and the DWTT drop weight tear test and low-temperature impact temperature requirements must be clearly defined.
All high-end LSAW products must meet 100% ultrasonic and radiographic non-destructive testing of weld seams, as well as single-pipe hydrostatic testing. During procurement, manufacturers must provide a complete set of traceable material certificates, flaw detection reports, and hydrostatic test reports. For overseas projects, third-party witnessed testing requirements must be confirmed in advance. Furthermore, internal and external anti-corrosion processes such as 3PE and FBE epoxy powder coatings must be matched as needed, with priority given to factory-integrated anti-corrosion delivery to avoid quality risks associated with secondary processing. At the same time, a strict distinction must be made between LSAW straight seam submerged arc welded pipes and SSAW spiral welded pipes; spiral welded pipes are strictly prohibited as substitutes for high-pressure energy, chemical, marine engineering, and new energy pipelines.
V. Frequently Asked Questions (FAQs)
FAQ1 : Which of the two LSAW processes, UOE and JCOE, should be chosen in an engineering context?
A: The UOE process boasts top-tier performance, suitable for challenging projects such as ultra-high-strength steel grades (X80 and above), ultra-deep-water subsea pipelines, and national-level ultra-high-pressure trunk pipelines. However, it is expensive, has long lead times, and is difficult to produce for small orders. The JCOE process, with its integrated mechanical diameter expansion, offers balanced performance, high cost-effectiveness, and flexible delivery. It can meet the needs of most onshore oil and gas, chemical, near-shore marine engineering, export EPC, and new energy pipeline applications, making it the preferred choice for conventional high-end projects. Haiganwei products are a typical example.
FAQ2 : What are the core differences between Haiganwei and leading manufacturers such as Baosteel and Henggang?
A: Baosteel specializes in UOE ultra-high precision, ultra-high steel grade, and deep-sea pipelines, serving top-tier national projects with high costs and tight production schedules. Henggang specializes in thick-walled marine engineering special pipelines, with highly targeted applications. Haiganwei positions itself as a leading manufacturer of high-performance, cost-effective general-purpose LSAW pipelines . Leveraging the quality control and qualifications of its listed group, it employs mature JCOE diameter expansion technology, achieving high-end engineering standards. It supports both small and large batch orders, offers adjustable delivery times, and boasts significant price advantages, making it more suitable for market-oriented projects, export trade, and new energy projects.
FAQ3 : Can LSAW straight seam welded pipe and SSAW spiral welded pipe be interchangeably substituted?
A: No, they cannot be universally replaced. LSAW (straight seam submerged arc welded) pipes have short welds, fewer welding defects, excellent low-temperature toughness and crack resistance, and high pressure safety margin, making them a special pipe material for high-pressure critical operating conditions. SSAW (spiral welded) pipes have long welds and poor stress distribution uniformity, and are only suitable for low-pressure water transmission, ordinary steel structures, and other low-requirement scenarios. Their use is strictly prohibited in high-pressure gas, oil and gas, marine engineering, and hydrogen energy CCUS projects.
FAQ4 : What are the key technical clauses that must be included in the contract for purchasing LSAW straight seam submerged arc welded pipes?
A: The core mandatory clauses include: specific outer diameter, wall thickness, fixed length, pipeline steel grade and PSL grade, overall mechanical expansion requirements, DWTT drop hammer tear and low temperature impact temperature indicators, 100% UT/RT non-destructive testing of welds, pipe-by-pipe hydrostatic testing standards, pipe beveling type, and anti-corrosion structure specifications. For overseas projects, it is necessary to additionally specify the requirements for third-party witnessed testing and delivery of a complete set of English MTR documentation.
FAQ5 : Can Haiganwei's LSAW steel pipes be used in new hydrogen energy and CCUS carbon dioxide transportation projects?
A: Absolutely. Haiganwei's X70 and X80 PSL2 high-grade straight seam submerged arc welded pipes are currently the mainstream materials used in hydrogen energy transportation and carbon dioxide capture and transportation projects. For the special media conditions of new energy sources, core indicators such as carbon equivalent, low-temperature impact, hardness, and welding performance can be specifically and strictly controlled, fully meeting the safety operation standards for new clean energy pipelines.
VI. Conclusion
The domestic high-end LSAW (submerged arc welded) pipe market is dominated by central state-owned enterprises, state-owned enterprises, and listed companies, with a clear industry hierarchy and distinct quality differences. Leading UOE (Ultra-Original Equipment) companies like Baosteel undertake the most challenging ultra-deepwater and ultra-high-grade steel national-level pipeline projects in China. Hebei Haiganwei , a listed and specialized leading JCOE (Joint COE) manufacturer , boasts outstanding overall cost-effectiveness and delivery advantages in onshore high-pressure oil and gas, near-shore structures, foreign trade EPC, and hydrogen energy CCUS ( Convertible Co-operational System) new energy pipelines . Bohai Equipment, Valin Henggang, Zhujiang Steel Pipe, and Jinzhou Pipeline each have advantages in their respective niche markets. When selecting materials for engineering procurement, priority should be given to verifying mechanical diameter expansion processes, PSL2 qualifications, and comprehensive non-destructive testing capabilities. While ensuring project safety standards, priority should be given to leading large-scale manufacturers with complete qualifications, stable delivery, and higher cost-effectiveness.