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Premium Stainless Steel Pipe with Superior Corrosion Resistance
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Understanding why Super Duplex (2507, S32750) is the ultimate choice for extreme environments.
Super Duplex pipes offer a mixed microstructure of austenite and ferrite (50/50), providing the benefits of both: high strength and exceptional corrosion resistance. With a PREN (Pitting Resistance Equivalent Number) > 40, these pipes withstand the harshest chloride-rich environments.
Unlike standard 300-series stainless steel, Super Duplex offers nearly double the yield strength. This allows engineers to reduce wall thickness, lowering the overall weight of offshore platforms and industrial piping systems without compromising safety.
Engineered for subsea applications, our pipes resist Stress Corrosion Cracking (SCC) and Hydrogen-Induced Stress Cracking (HISC), making them indispensable for modern Oil & Gas exploration in the North Sea and Gulf of Mexico.
Established in 2003, Shaanxi Kerlimar Engineers Co., Ltd. has long been engaged in international trade business, mainly a variety of pipes, carbon steel, alloy steel, stainless steel material, seamless pipe, straight seam welded pipe, spiral welded pipe and matching pipe fittings. Manufacturing standards for ASTM, ASME, EN, JIS and so on, in line with international standards. We are providing good quality, price competition, timely delivery, perfect service!
Years of Expertise
Patented Technologies
Custom Manufacturing
International Patents
The chairman of the company: Mr. Ming SUN, is a strong environmentalist and a fan of technological innovation. He cares about climate change and environmental protection, and makes continuous efforts and takes action for it.
Began in 2019, in response to the national innovation, focus on the new vertical axis wind power technology research and development... solving the bottleneck of wind power, mainly focus on research and development of new vertical axis wind turbine design, main direction, suspension, grid structure, rail maglev, cable, and more.
In December 2020, we won the national High-tech Enterprise certification. In December 2023, we were invited to participate in the Dubai COP28 Conference. We are currently completing 10KW-500KW series of units, contributing to the early realization of double carbon goals and controlling global temperature rise below 1.5°C.
Bridging the gap between Chinese manufacturing excellence and international engineering standards.
Our Super Duplex pipes adhere strictly to ASTM A789/A790, ASME SA789/SA790, and EN 10216-5. Every shipment includes 3.1 or 3.2 Material Test Reports (MTR).
We provide documentation in multiple languages and localized project management for EPC contractors in the Middle East, Southeast Asia, and Europe, ensuring seamless integration into local logistics networks.
Beyond standard PMI (Positive Material Identification), we offer Eddy Current testing, Ultrasonic inspection, and Hydrostatic testing to meet the Zero-Defect requirement of critical energy infrastructure.
China accounts for over 50% of the world's stainless steel production. For Super Duplex Stainless Steel, this concentration offers unique benefits to global buyers:
| Process Stage | Timeframe | QC Check |
|---|---|---|
| Material Sourcing | 3-5 Days | Spectroscopy |
| Pipe Fabrication | 15-25 Days | Dimensional/UT |
| Surface Treatment | 2-3 Days | Pickling/Passivation |
Where our Super Duplex products redefine performance limits.
In the arid regions of the GCC, our S32750 pipes handle high-pressure brine and concentrated seawater, preventing the localized pitting common in lower-grade steels.
Used in heat exchangers and pressure vessels for organic acid production and phosphoric acid processing where temperature and acidity levels are extreme.
Aligned with our Chairman's vision for renewable energy, these pipes provide structural support and fluid transport in corrosive maritime wind environments.
Critical for "sour service" pipelines carrying H2S-rich crude. Our pipes meet NACE MR0175/ISO 15156 standards for sulfide stress cracking resistance.
Development of "Lean" Super Duplex grades to provide specific corrosion resistance at lower costs by optimizing Manganese and Nitrogen content.
Implementation of AI-powered vision systems in our Chinese factories to detect microscopic surface defects during the extrusion process.
Increasing the use of recycled stainless steel scrap (up to 80%) in the melting process to reduce carbon footprint, meeting ESG goals of global partners.
Expert answers for procurement professionals and engineers.
Precision-Crafted Butt Welded Pipe Fittings for Seamless Solutions
China Suppliers for API Tubing, Casing, and Oil Screens
Trusted Butt Welded Pipe Fittings Supplier Since 1986
Reliable Suppliers of API Tubing and Oil Casing Products
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Kerlimar