Sihe Steel
Sihe Steel
Operating from our highly integrated metallurgical complex in Shandong, China, Liaocheng Sihe Stainless Steel Material LTD represents the pinnacle of modern cold rolled steel processing and high-performance precision tubing manufacturing. Equipped with six state-of-the-art production lines, our industrial capability spans the entire process pathway of cold rolling, precision drawing, bright annealing, and finishing of advanced corrosion-resistant alloys.
We adhere strictly to international manufacturing frameworks including GB, ASTM, ASME, JIS, and EN standards. Our primary alloy portfolios are meticulously engineered to satisfy demanding service environments, utilizing high-grade austenitic alloys like 304/304L, 316L, 321, 317L, 309S, and 310S, as well as ultra-durable options like Incoloy 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Our engineered cold rolled sheets, plates, and seamless coiled tubing are deployed in vital infrastructure across diverse global industries where chemical degradation, extreme pressure, and high temperature cycles are constant.
As subsea extractions shift into ultra-deep waters, the extreme offshore environments dictate maximum structural integrity. Our super-long seamless coiled tubing (up to 32,800 feet / 10,000 meters) in Super Duplex 2507, Incoloy 825, and Inconel 625 serves as the reliable pipeline for control fluids, chemical injection, and umbilical modules.
Ultra-pure gas delivery networks and pharmaceutical biotechnology require ultra-clean inside surface finishes. Our high-precision austenitic 316L capillary tubing and bright annealed polishing tubes are processed with advanced online heat treatments to minimize surface roughness (Ra) and eliminate contamination points.
Designed for thermal efficiency and resistance to pitting corrosion in cooling towers, nuclear reactors, and boiler systems. Our seamless heat exchanger pipes in 304L, Duplex 2205 and other specialized grades are tested at 100% air-tightness, guaranteeing leak-free operation over extended lifecycles.
Liaocheng Sihe manufactures coiled tubing in sizes ranging from outer diameter 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters), with wall thicknesses up to 0.165 inch (3 millimeters). Lengths up to 32,800 feet (10,000 meters) are available for umbilical applications. Below is the chemical compatibility and mechanical capability overview:
| Steel / Alloy Grade | UNS Designation | Yield Strength (Min MPa) | Tensile Strength (Min MPa) | Key Performance Attributes |
|---|---|---|---|---|
| Austenitic 304/304L | S30400/S30403 | 205 | 515 | Excellent formability, general corrosion resistance in low-acid systems. |
| Austenitic 316/316L | S31600/S31603 | 290 | 580 | High resistance to chloride pitting; ideal for marine and pharmaceutical environments. |
| Duplex 2205 | S31803 / S32205 | 450 | 655 | Exceptional fatigue life; double the strength of standard austenitic alloys. |
| Super Duplex 2507 | S32750 | 550 | 795 | Extremely high PREN (>40); specifically designed for harsh marine chloride exposure. |
| Incoloy 825 | N08825 | 241 | 586 | Outstanding resistance to reducing and oxidizing acids and stress-corrosion cracking. |
| Inconel 625 | N06625 | 414 | 827 | Virtually immune to chloride stress cracking; high temperature structural stability. |
Our facilities utilize world-first-class online bright annealing technology. Through protective atmosphere induction furnaces, we recrystallize the grains of cold-worked stainless steel without causing oxidation. This process leaves the tube with a clean, reflective mirror finish on both internal and external walls.
To ensure zero defect rates, we implement a strict 100% testing matrix, comprising hydrostatic testing, compressed air leakage testing, flaring and flattening mechanical verification, hardness mapping, and automated eddy current defect scanning.
Navigating the complex global steel market requires high quality coupled with competitive pricing models. Sourcing cold rolled products and coiled tubing directly from Liaocheng Sihe in China yields unmatched operational advantages:
Through our partnerships with major state-run smelting operations, we secure consistent billet chemistry. This reduces raw material price volatility, allowing us to offer stable, long-term quotes even during global nickel and molybdenum fluctuations.
Our automated six-line infrastructure optimizes production cycles. High output rates reduce per-ton overhead costs, which translates directly to cost savings for our clients during volume negotiations.
Liaocheng’s integrated transport network links our mills directly to major ocean port terminals (Qingdao, Tianjin). This connection minimizes domestic transit times and lowers port-side handling and shipping fees.
Heat Exchangers
Refrigeration & HVAC Systems
Chemical Industry
Food & Beverage Processing
Pharmaceutical Industry
Power Plants & Energy Systems
Petrochemical Engineering
Automotive & Aerospace
As the steel industry adopts green manufacturing practices and seeks higher material yields, Liaocheng Sihe is updating its technology roadmap to meet the next generation of industrial requirements:
We are working to integrate 100% pure hydrogen-based bright annealing atmospheres. This setup prevents surface carbonization, reduces surface friction, and increases the structural fatigue resistance of coiled products inside subsea umbilicals.
To meet the needs of aerospace, semiconductor, and instrument lines, we are refining our cold drawing processes. This allows us to hold outer and inner diameters to ultra-precise tolerances within +/-0.03mm.
Quality control is built directly into our production processes. Below are the certifications and quality credentials achieved by our mills, confirming full compliance with international engineering requirements:
We offer tailored processing options to adapt our cold rolled metals and tubing to your specific project designs:
We process various materials (e.g., 304, 316L, 2205) and custom specifications, covering diameters from 6.35mm to 19mm for seamless stainless steel coils.
We provide specialized bending, helical forming, and precision drawing, designed to match the installation dimensions of heat exchangers and condensers.
We apply laser cutting, high-precision mechanical cutting, and flame cutting to deliver straight tubes with clean, burr-free ends.
We perform flanging processing on tube ends to assist with installation in automotive exhaust lines, chemical piping, and diagnostic systems.
We offer pickling, chemical polishing, mechanical polishing, and electrolytic treatments. These services ensure clean internal walls that prevent particulate trap issues in ultra-high vacuum applications.
Duplex 2205 stainless steel contains an austenitic-ferritic microstructure that provides high yield strength and stress corrosion cracking resistance.
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Our 1/2" coiled stainless steel tubing is designed for oil field control lines and umbilical installation.
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Manufactured for high-temperature service, 310S steel offers oxidation resistance up to 1100°C.
View Category DetailsOur prices are subject to change depending on raw material costs, supply trends, and other market factors. We will send you an updated pricelist once your company contacts us for a direct quote.
Yes, we require all international orders to have an ongoing minimum order quantity. For smaller trial shipments or distribution volumes, please contact our export team to discuss customized options.
Yes, we supply complete compliance documentation including Mill Test Certificates (MTRs) to EN 10204 3.1, Certificates of Analysis, insurance paperwork, certificates of origin, and other necessary export documentation.
For standard samples, lead time is approximately 7 days. For mass production, lead time runs 20 to 30 days after receiving deposit confirmation. Lead times apply once we have deposit cleared and your final specification sign-off.
Payments can be made to our verified corporate bank account, via Western Union, or PayPal. Our standard terms are a 30% deposit in advance, with the remaining 70% balance due against the copy of the Bill of Lading (B/L).
We warranty both our materials and workmanship. Our focus is to deliver products that meet your project requirements. Regardless of warranty status, it is our policy to investigate and resolve any quality issues to client satisfaction.
Yes, we use sea-worthy export packaging to protect our shipments. High-precision products are packed in reinforced wooden crates, and coils are secured with steel straps and internal moisture barriers to prevent sea-spray corrosion.
