Sihe Steel
Sihe Steel
Within high-performance industrial plumbing, the 34mm Outer Diameter (OD) holds a strategically vital structural sweet spot. It acts as an optimal bridge between smaller instrumentation tubes and bulky main service lines. In extreme pressure environments, a weld line is a vulnerability. This is why global heavy engineering programs insist on seamless manufacturing technology.
Seamless manufacturing eliminates molecular grain boundaries that are compromised by welding heat-affected zones (HAZ). It provides an isotropic material behavior, critical when coping with cyclic thermal expansion and high structural loads in deepwater oil fields, industrial heat exchangers, and advanced aerospace cooling loops.
Our 34mm seamless steel tubes are cold-drawn and cold-rolled to absolute concentricity, ensuring reliable flow profiles and resistance to cavitation erosion under high velocity.
From mainstream austenitic types (304, 304L, 316L, 321, 317L, 309S, 310S) to super alloys (Duplex 2205, Super Duplex 2507, Incoloy 825, Inconel 625, Incoloy 800).
For over a decade, Liaocheng Sihe Stainless Steel Material LTD has defined the standard for manufacturing stainless steel coiled tubing, polishing tubes, and seamless coiled tubing in China. Operating six state-of-the-art production lines, the company maintains absolute command over dimensional accuracy, finishing properties, and mechanical integrity.
We execute standard-compliant workflows aligning tightly with GB, ASTM, ASME, JIS, and EN criteria. Sihe has gained major market shares, exporting up to 80% of our production volume to competitive markets including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Our competitive advantage centers on the integration of bright annealing technology. Utilizing this inline thermal process, we soften the stainless steel tube structure to remove processing strain, producing a scale-free, mirror-bright surface inside and out. This maximizes corrosion resistance by keeping the chromium distributed homogeneously in the matrix.
Located in Liaocheng, the heart of China’s high-precision steel tube sector, we leverage a concentrated raw material infrastructure, shortening supply times and stabilizing upstream steel supply.
By blending advanced metallurgical equipment with domestic manufacturing scales, we deliver top-tier options such as Inconel 625 and Duplex 2507 at highly competitive costs.
Every meter of tubing undergoes a comprehensive battery of tests: compression, flaring, bending, 100% hardness evaluations, elongation, and air-tightness testing to eliminate defects before shipping.
Beyond manufacturing raw seamless tubes, we offer downstream structural customization to ensure our products fit seamlessly into your engineering assemblies.
Optimized for stainless steel coils across various sizes (OD 6.35mm to 19mm and up to 34mm) and steel grades like 304, 316L, and 2205.
Precision coil bending, spiral winding, and custom geometry configurations engineered specifically for space-constrained heat exchanger chambers.
State-of-the-art laser cut-to-length solutions that leave clean, burr-free ends, ready for immediate robotic orbital welding.
Precision flanged joints designed for exhaust systems, chemical processing loops, and high-vibration instrument lines.
Liaocheng Sihe is certified for quality and design compliance under leading international bodies. Our materials and operations meet PED (Pressure Equipment Directive), ISO 9001:2015, and related marine classification certifications.
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