Sihe Steel
Sihe Steel
A comprehensive review of technical indicators, processing parameters, and global supply chain optimization.
As a cornerstone alloy of the global industrial economy, Grade 304 (UNS S30400) austenitic stainless steel represents the optimal balance of tensile strength, corrosion resistance, and versatile workability. At Liaocheng Sihe Stainless Steel Material LTD, we translate materials science into engineering reliability. With six continuous drawing and high-efficiency rolling lines, we produce high-specification seamless and welded coiled tubing that satisfies the most rigorous international standards.
Our advanced metallurgical processes strictly adhere to GB, ASTM, ASME, JIS, and EN requirements. By regulating the chemical composition—guaranteeing a minimum of 18% Chromium and 8% Nickel—we cultivate a resilient passive chromium oxide layer that prevents oxidation in challenging chemical, heat exchange, and subsea hydraulic umbilical networks.
Analyze mechanical properties and composition thresholds across high-performance steel grades.
| Grade (UNS) | Cr (%) | Ni (%) | Mo (%) | Tensile Strength (MPa) | Yield Strength (MPa) | Key Applications |
|---|---|---|---|---|---|---|
| 304 (S30400) | 18.0 - 20.0 | 8.0 - 10.5 | - | ≥ 515 | ≥ 205 | Chemical Processing, HVAC, General Heat Exchangers |
| 304L (S30403) | 18.0 - 20.0 | 8.0 - 12.0 | - | ≥ 485 | ≥ 170 | Cryogenic Tanks, Welded Structurals, Acid Lines |
| 316L (S31603) | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | ≥ 485 | ≥ 170 | Marine Environments, Biotech, Pharmaceutical UHP Tubing |
| Duplex 2205 (S32205) | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | ≥ 655 | ≥ 450 | Deep-water Oil & Gas Umbilicals, High-pressure Hydraulics |
| Super Duplex 2507 (S32750) | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 5.0 | ≥ 800 | ≥ 550 | Offshore Desalination, Highly Corrosive Acid Chambers |
| Incoloy 825 (N08825) | 19.5 - 23.5 | 38.0 - 46.0 | 2.5 - 3.5 | ≥ 586 | ≥ 241 | Sour Gas Wells, Nuclear Fuel Reprocessing, Chemical Valves |
The performance limits of stainless steel tubing are defined by heat treatment. Our factory integrates the industry’s leading online bright annealing (BA) technology, heat-treating pipes in a dry hydrogen atmosphere. This process prevents oxidation, preserves surface brightness, and eliminates internal mechanical stresses from the cold drawing process.
To achieve exceptional quality, our raw material runs through specialized calibration equipment. We perform complete quality checks on dimensional accuracy, wall thickness variations, and mechanical properties. Coiled tubing is available in outer diameters ranging from 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3.0 mm). Single coils can reach continuous lengths of 32,800 feet (10,000 meters) without orbital welds, reducing fluid system leakage risks.
This high-integrity coiled tubing is vital for deep-water offshore platforms, subsea umbilical systems, and complex oil and gas extractions, where extreme environments demand safety and corrosion resistance.
Understanding cost factors, technical specifications, and international standard requirements.
Stainless steel prices fluctuate based on LME/SHFE nickel and chromium indexes, along with molybdenum surcharges. We offer stable quarterly framework pricing to protect procurement operations from raw material volatility.
We work with international projects on continuous minimum order terms. For developmental trial runs or regional distributors, we support customized batch allocations to facilitate qualification processes.
Every shipment is backed by Mill Test Certificates (MTC) conforming to EN 10204 3.1. We provide complete PMI chemical analysis, mechanical property testing reports, and export compliance documents.
Delivering high-integrity stainless steel piping for demanding engineering fields worldwide.
Precision post-processing tailored for custom engineering requirements.
We support various materials (e.g., 304, 316L, 2205) and custom specifications for coils ranging from 6.35 mm to 19 mm, matching unique design dimensions.
Our production services include custom bending, spiral forming, and precision drawing, designed to optimize performance in heat exchangers.
Our facility provides laser, mechanical, and flame cutting options for high-precision, efficient material processing.
We work to clean, pickling, electropolish, and physically passivate steel pipes, developing products with state-of-the-art technologies.
We produce custom flanges designed for automotive exhaust systems, chemical pipelines, and precision instrument connections.
Explore the full range of flexible coils, heat exchanger pipes, and customized stainless steel plates.
100% Inspection guarantees subsea safety, heat exchanger lifecycle, and chemical resistance.
Our laboratory facilities are fully equipped to perform complete material checks. In addition to chemical PMI analysis, we perform:
Developing advanced metallurgy and process capabilities to support the clean energy transition.
Optimizing austenitic structures to prevent hydrogen embrittlement. Developing custom 316L and high-nickel alloys designed for high-pressure hydrogen refueling stations and delivery lines.
Expanding processing lines to draw continuous tubes up to 15,000 meters. This technology helps lower the risk of joint corrosion and structural failures in deep-sea environments.
Technical guidance and answers to common procurement questions for industrial engineers and design buyers.
Dual-certified stainless steel combines the mechanical strength of Grade 304 with the intergranular corrosion resistance of low-carbon Grade 304L (carbon max 0.030%). This configuration ensures structural reliability in high-temperature applications without the risk of sensitization during welding.
We use export-ready wooden cases, internal plastic wrapping, and steel end protectors. For temperature-sensitive or high-purity capillary tubing, we offer sealed packing to prevent particulate and moisture contamination during sea transport.
Standard material samples are prepared in approximately 7 days. Mass production runs are typically completed and ready for shipment 20 to 30 days after drawing approval and deposit confirmation.
All process pipes undergo pressure testing according to ASTM A450 and ASTM A1016 standards. Hydrostatic pressures are adjusted based on outer diameter and wall thickness, with options for gas-leak testing up to 70 MPa for specific critical applications.
Rates are determined by weight, volume, and the selected transportation method. We arrange sea container shipments for high-volume orders, while air freight is available for urgent custom components.
Yes, we warrant our materials and workmanship. Our commitment is to address and resolve all customer issues to your satisfaction. In warranty or not, we support our products throughout their service life.
