Sihe Steel
Sihe Steel
Precision engineered stainless steel and alloy tubing options tailored for high-temperature heat exchangers, instrumentation, and subsea applications.
Established with a vision to deliver world-class piping solutions, Liaocheng Sihe Stainless Steel Material LTD is a premier manufacturer specializing in high-performance stainless steel coiled tubes, polishing tubes, and seamless coiled tubing. Utilizing state-of-the-art bright annealing technology and online softening treatments, we produce high-grade tubing designed to meet the strict demands of international standards including GB, ASTM, ASME, JIS, and EN.
Our dynamic inventory and processing capabilities include premium grades such as 304/304L, 316L, 321, 317L, 309S, 310S, and INCOLOY 800. We also process advanced alloys like Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625, serving mission-critical systems worldwide.
AISI 304 (UNS S30400) is the standard "18/8" stainless steel. It is an austenitic alloy characterized by its high chromium (minimum 18%) and nickel (minimum 8%) content. This structural balance provides exceptional oxidation and corrosion resistance in moderate chemical and marine environments.
Unlocking technological efficiency, economies of scale, and advanced metallurgical processing in Liaocheng's steel cluster.
Our online bright annealing technology softens stainless steel tubes in a protective atmosphere, producing a clean, mirror-like finish, reducing oxidation, and optimizing mechanical processing characteristics.
We produce ultra-long seamless coiled tubing in continuous lengths of up to 32,800 feet (10,000 meters) without orbital welds. This reduces potential leak paths in subsea control lines and chemical injection lines.
Every batch undergoes non-destructive and physical tests, including hydrostatic testing, air tightness verification, flaring, compression tests, bending tests, and 100% hardness inspections.
Tailoring stainless steel tubing to the demands of precision engineering, deepwater extraction, and sanitary processing.
We provide versatile fabrication methods to optimize the installation of your tubing components:
Sihe steel tubing is designed for critical, high-reliability applications, including:
Strategic guidance for sourcing managers facing strict engineering tolerances, compliance requirements, and logistics constraints.
Engineering teams require compatibility across regional designations (UNS, EN, JIS, GB). We provide material certs showing equivalence and chemical compliance with ASTM A269 and EN 10216-5.
With 80% of our production exported globally, we use heavy-duty seaworthy packaging, custom export crates, and specialized handling protocols to ensure tubing arrives damage-free.
Get competitive, factory-direct pricing without compromising on material grade purity. Online bright annealing and high-yield extrusion lines help keep manufacturing costs down.
We maintain rigorous testing protocols and certifications to meet high international engineering and safety standards.
Clear, technical answers to common questions about our procurement, metallurgy, and delivery processes.
Our raw material prices depend on daily LME alloy pricing indexes (specifically nickel and chromium content variations) and order processing requirements. We will send you an updated price list once you contact our engineering team with your specifications.
Yes, we require all international orders to have an ongoing minimum order quantity. For customized coil runs, the MOQ depends on the coil weight and physical dimensions. Please contact us to discuss the requirements for smaller or trial orders.
Yes, we provide comprehensive documentation for every shipment, including EN 10204 3.1/3.2 Mill Test Certificates, Certificates of Analysis/Conformance, Hydrostatic Test Results, Eddy Current Verification, and certificates of origin for duty concessions.
For standard samples, the lead time is approximately 7 days. For mass production and custom extrusion runs, lead times average 20-30 days after deposit confirmation and technical approval. We work to accommodate tight project deadlines.
We accept wire transfers (T/T), Western Union, and PayPal. Our standard terms are 30% deposit in advance, with the remaining 70% balance payable against the presentation of the Bill of Lading (B/L) and inspection documents.
We warranty our material properties, chemical compositions, and physical workmanship. If any issues arise, we work to address and resolve them, including replacement or technical adjustment, to ensure your system functions reliably.
We use heavy-duty export packaging, including wooden or metal reels, bubble wrap, and moisture-proof plastic covers. High-alloy materials are shipped in reinforced crates to prevent physical impact or contamination in transit.
Our coiled tubing is available in 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). Customized sizes can also be produced to meet your requirements.
A wider selection of industrial-grade alloy piping, seamless control tubes, and heat exchanger components.
