Sihe Steel
Sihe Steel
Browse our primary inventory of industry-certified stainless steel pipes, polishing tubes, and specialized coiled lines direct from our manufacturing floor.
Liaocheng Sihe Stainless Steel Material LTD is a premier manufacturer specializing in industrial stainless steel coiled tubing, polishing pipes, and seamless alloy lines from China. Equipped with six state-of-the-art production lines, we adhere strictly to international standards, including GB, ASTM, ASME, JIS, and EN, to guarantee consistent mechanical performance and longevity.
We work with an extensive portfolio of steel types to solve corrosion and structural challenges globally. Our grades include standard austenitic variants (304/304L, 316L, 321, 317L, 309S, 310S), high-temp / high-corrosion superalloys (INCOLOY 800, Incoloy 825, Inconel 625), and high-strength duplex combinations (Duplex 2205, Super Duplex 2507). With a decade of dedicated fabrication history and an export network reaching more than 30 countries across the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe, we are prepared to support your mission-critical operations.
Why AISI 304 (UNS S30400 / EN 1.4301) remains the absolute foundational element of modern hydraulic, structural, and chemical transport infrastructures.
AISI 304, characterized by its composition of 18% chromium and 8% nickel, represents the workhorse of the global stainless steel industry. Across the Americas, Europe, and the APAC region, industrial expansion demands piping that offers high tensile strength, exceptional ease of forming, and predictable corrosion resistance. From deepwater offshore control systems to cleanrooms in modern pharmaceutical hubs, the requirement for standard 304 and 304L is growing rapidly.
Furthermore, as sustainability criteria take precedence in material selection, AISI 304’s total recyclability and prolonged life cycle minimize its carbon footprint. In green energy, hydrogen transport, solar thermal systems, and seawater purification, 304 tubing bridges the gap between raw economic viability and high-end thermal performance. Mill-direct sourcing has become key for global procurers looking to mitigate raw material price volatility.
Understanding the engineering criteria that separate premium industrial tubing from sub-standard products.
| Steel Grade (ASTM/UNS) | C (Max %) | Cr (%) | Ni (%) | Mo (%) | Tensile Strength (MPa Min) | Yield Strength (MPa Min) |
|---|---|---|---|---|---|---|
| AISI 304 (S30400) | 0.08 | 18.0 - 20.0 | 8.0 - 10.5 | - | 515 | 205 |
| AISI 304L (S30403) | 0.03 | 18.0 - 20.0 | 8.0 - 12.0 | - | 485 | 170 |
| AISI 316L (S31603) | 0.03 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | 485 | 170 |
| Duplex 2205 (S32205) | 0.03 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 655 | 450 |
| Incoloy 825 (N08825) | 0.05 | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | 586 | 241 |
Our mill utilizes advanced, inline bright annealing technology. This process treats the stainless steel tubes in a protective, oxygen-free hydrogen atmosphere, softening the metal while maintaining a smooth, scale-free, and high-reflectivity surface finish (Ra values < 0.4μm).
Every batch undergoes rigorous quality validation, including hydrostatic, pneumatic, tensile, and hardness testing. We also execute 100% flaring, flattening, and bending trials to ensure the tubes perform under high pressures and in bending configurations.
Our seamless and welded coiled tubing spans outer diameters from 0.125 inches (3.175 mm) up to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inches (3 mm). Single, continuous coil lengths can reach up to 32,800 feet (10,000 meters) to reduce connection points in deep-sea umbilicals.
An objective view of how LME indices, steel grades, and processing specifications shape your sourcing budget.
The cost of AISI 304 tubes is directly tied to the London Metal Exchange (LME) pricing for Nickel and Chromium. Surcharges fluctuate monthly. Selecting lower-carbon variants like 304L or molybdenum-bearing grades like 316L increases baseline material costs but mitigates corrosion risks over the long term.
Tolerances defined by standards like ASTM A269 or A213 dictate cold-drawing passes. Strict tolerance requirements (e.g., tight OD and wall thickness limits for instrumentation systems) add steps to manufacturing and inspection, which is reflected in the final cost per meter.
Continuous coiled tubing up to 10,000 meters reduces the need for orbital welding in the field, saving installation labor and reducing potential leak points. The engineering effort required to manufacture long, orbital-weld-free coils accounts for their premium pricing compared to straight 6-meter sections.
We maintain a quality management system verified by major global certification and inspection registries.
A detailed breakdown of our key product classifications, manufactured to standard tolerances for immediate dispatch.
Manufactured from grades like Duplex 2205, this product offers excellent corrosion resistance in high-chloride settings.
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Includes standard 1/2-inch stainless steel coiled tubing and custom instrumentation tubing for gas and fluid lines.
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High-temperature furnace tubes designed to resist scaling and carburization up to 1100°C.
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Seamless design for hydraulic control lines, offshore chemical injection, and subsea umbilical assemblies.
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Optimized for thermal transfer efficiency in condensers, boilers, and waste heat recovery systems.
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Features ultra-smooth internal surfaces to meet hygienic requirements in food, beverage, and biotech applications.
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High-precision micro-bore tubing for chromatography, medical devices, and cleanroom instrumentation.
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Welded and formed piping engineered to withstand cyclical thermal stresses in automotive exhaust systems.
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Specialty lines in grades such as Inconel and Incoloy, designed for hot acid and highly corrosive environments.
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We provide a range of post-drawn treatments and finishing processes to ensure your tubing integrates smoothly into your downstream systems.
From polar deep-sea drill sites to extreme heat petrochemical facilities, our tubing is built to perform.
Ensures optimal thermal transfer in boilers and condensers.
Resists refrigerant erosion in commercial heat pumps.
Handles organic acids and moderately corrosive media.
Polished interior surfaces to prevent microbial buildup.
Meets strict hygienic guidelines for drug production.
Maintains structural stability under high thermal loads.
Resists sour gas environments and high pressures.
Provides high strength-to-weight ratios for vehicle structures.
Expert answers to common engineering, logistics, and quality assurance questions.
Examine our specialized capillary lines, coiled heat exchanger loops, and high-temp alloy tubes.
