Explore our highly integrated product lines, fabricated to international engineering standards and optimized for high-pressure pipeline applications.
How technological optimization, metallurgical progress, and manufacturing breakthroughs have repositioned welded steel piping as the backbone of modern global infrastructure.
The industrial landscape for welded steel piping has undergone a tectonic shift over the last decade. Historically, seamless pipe was the only option for high-pressure configurations due to concerns over weld integrity. Today, modern Electric Resistance Welding (ERW), Spiral Submerged Arc Welding (SSAW), and Longitudinal Submerged Arc Welding (LSAW) techniques have revolutionized the pipeline industry.
By leveraging advanced thermo-mechanical control processing (TMCP), manufacturers can ensure that the heat-affected zone (HAZ) in welded pipes maintains microstructural parity with the parent steel plate. This produces high-yield welded steel tubes that offer equivalent structural and pressure ratings to seamless alternatives, but at a significantly lower production cost.
Key metallurgical advancements integrated into contemporary production include:
Founded in 2003, we bring over 21 years of manufacturing expertise, engineering excellence, and technological innovation to the global steel supply chain.
Shaanxi Kerlimar Engineers Co., Ltd. has established a strong reputation as an international trade and manufacturing partner. We specialize in supply networks for carbon steel, alloy steel, and stainless steel products, including seamless pipe, straight seam welded pipe, spiral welded pipe, and matching pipeline fittings. Our products strictly comply with world-recognized manufacturing criteria, including ASTM, ASME, EN, JIS, and API standards.
Driven by the vision of our chairman, Mr. Ming SUN, Kerlimar merges industrial steel distribution with clean energy technology R&D. Beginning in 2019, our team expanded its focus into structural engineering components for wind turbines, developing new vertical axis wind turbine systems to solve onshore and offshore power limitations. This work includes grid structures, maglev rail integration, and land-floating systems, earning over 40 domestic patents and multiple international patent applications.
In recognition of our R&D focus, we received the national High-tech Enterprise certification in 2020. This was followed by invitations to participate in the China-Finland High Technology Match Conference in 2021, and the Dubai COP28 Climate Conference in 2023. Our commitment to high quality, competitive pricing, prompt delivery, and reliable service drives everything we do.
How smart production and regional industrial clustering keep global projects on schedule.
Global procurement teams must plan for logistics bottlenecks, fluctuating raw material costs, and strict ESG requirements. China's transition to Factory 4.0 addresses these issues through centralized production clusters and automation. Coils, plates, and billet processing are closely integrated with pipe rolling mills, reducing regional shipping costs and material handling times.
By using automated manufacturing management systems, Shaanxi Kerlimar Engineers coordinates with top-tier domestic rolling mills to optimize production runs. This setup helps reduce lead times, even for custom wall thicknesses, non-standard diameters, and specialized coatings (such as 3LPE, FBE, or cement mortar lining).
Furthermore, our integrated supply chain offers strong price stability by sourcing raw hot-rolled coils directly from major state-owned steel plants. This allows us to buffer against price volatility and provide reliable pricing for long-term project contracts.
To ensure reliability under harsh operating conditions, every production run undergoes testing in accredited laboratories. These procedures include:
Providing reliable performance across demanding industrial environments.
Our API 5L line pipes and casing products are designed for demanding upstream extraction, midstream transmission, and downstream refining. We supply high-strength grades (such as X52, X60, and X65) with targeted anti-corrosion properties to handle sour gas and high-pressure fluid transportation.
For modern airports, high-rise frameworks, and stadium structures, our rectangular and square section tubes offer high torsional stiffness and load-bearing capacity. These parts are designed to support complex architectural shapes and wind-resistant designs.
For colder municipal environments, we supply pre-insulated welded pipe networks. These systems integrate carrier steel pipes with thick polyurethane foam insulation and high-density polyethylene (HDPE) outer protective jackets to minimize energy loss.
We are applying our experience in heavy steel fabrication to clean energy technology. Under the leadership of Mr. Ming SUN, Shaanxi Kerlimar Engineers has developed vertical axis wind turbine designs. These structures require high-fatigue-resistant welded tubular columns and structural lattices to support maglev components and cable arrays.
By applying our steel fabrication experience to renewable infrastructure, we provide our customers with robust, long-term structural components. Whether you require standard line pipes or customized structural parts for clean tech applications, Kerlimar delivers consistent, reliable engineering support.
"Our efforts in clean energy technology, including the 10KW-500KW experimental wind turbine units, demonstrate our focus on new productivity tools. We align our industrial supply chains with ESG goals to support the transition toward carbon neutrality and sustainable energy infrastructure."
— Mr. Ming SUN, Chairman
Answers to common technical, manufacturing, and logistics questions from procurement managers and engineers.
We use a multi-stage testing process. This begins with online automatic ultrasonic testing (UT) along the weld line immediately after fabrication, followed by visual inspections. After sizing and cutting, each pipe undergoes hydrostatic testing. Finally, another round of offline UT or radiographic inspection (X-ray) is performed on the pipe ends and weld seams to ensure they meet API and ASTM standards.
PSL2 introduces stricter mechanical and chemical requirements. It specifies Charpy V-notch impact toughness testing, places strict limits on carbon equivalent values (CEq) for weldability, requires traceability from plate to pipe, and enforces tighter dimensional tolerances. PSL2 is typical for high-pressure, sour service, and cold-weather pipelines.
We offer several coating options, including 3-Layer Polyethylene (3LPE) for sub-grade burial, Fusion Bonded Epoxy (FBE) for chemical resistance, Coal Tar Epoxy, and internal liquid epoxy linings. We also provide zinc-rich priming and concrete weight coatings (CWC) for offshore pipelines.
We customize outer diameters, wall thicknesses, and pipe lengths. Our partners use adjustable tooling on ERW forming mills and custom angle settings on SSAW spiral mills to produce non-standard dimensions. This helps engineers minimize scrap rates and optimize onsite installation.
Every shipment includes Mill Test Certificates (MTC) matching EN 10204 Type 3.1 or 3.2. These documents detail the heat number, chemical composition, tensile and yield strength, impact test values, and hydrostatic test verification.
We apply our experience in heavy-duty steel pipe and structural section manufacturing to renewable energy projects. This includes fabricating tower components, base columns, and structural tubing designed to support wind turbines and maglev rail systems.
Complete your pipeline layout with our matching range of high-pressure fittings, industrial valves, and insulation sleeves.
Kerlimar