Sihe Steel
Sihe Steel
Explore our industrial-grade stainless steel tubes and system connections certified under international GB, ASTM, ASME, JIS, and EN protocols.
An Industrial Guide to Chemical Specifications, Mechanical Requirements, and Selection Criteria.
ASTM A213 (or ASME SA213) represents the pinnacle standard specification for seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. These materials are critical for components operating under high-temperature cycles and high mechanical loads. In critical power generation utilities, petrochemical refining, and deep subsea exploration, failure is not an option. Thus, understanding the structural metallurgy of ASTM A213 steel grades is key to maximizing system lifespan and safety.
Common austenitic grades include TP304, TP304L, TP316, TP316L, TP321, TP310S, along with specialty Duplex and Super Duplex alloys such as S32205 (2205) and S32750 (2507). Lower carbon variants (indicated by the "L" suffix) provide enhanced protection against intergranular sensitization during welding processes, making them crucial for onshore chemical reactors and subsea control umbilicals.
Selecting the correct ASTM A213 grade depends on operating temperatures, corrosion aggressiveness, and mechanical stress profile:
"The presence of molybdenum in TP316 and chromium-nickel ratios in Super Duplex materials are engineered specifically to combat chloride-rich environments. For extreme temperatures, bright hydrogen annealing offers clean microstructural configurations that minimize pressure drop and guarantee seamless flow."
| Grade Designation | UNS Number | Carbon (C) max % | Chromium (Cr) % | Nickel (Ni) % | Molybdenum (Mo) % | Other Elements |
|---|---|---|---|---|---|---|
| TP304 | S30400 | 0.08 | 18.0 - 20.0 | 8.0 - 11.0 | - | N: 0.10 max |
| TP304L | S30403 | 0.035 | 18.0 - 20.0 | 9.0 - 13.0 | - | N: 0.10 max |
| TP316 | S31600 | 0.08 | 16.0 - 18.0 | 10.0 - 14.0 | 2.0 - 3.0 | N: 0.10 max |
| TP316L | S31603 | 0.035 | 16.0 - 18.0 | 10.0 - 15.0 | 2.0 - 3.0 | N: 0.10 max |
| TP321 | S32100 | 0.08 | 17.0 - 19.0 | 9.0 - 12.0 | - | Ti: 5 x C min to 0.70 max |
| TP310S | S31008 | 0.08 | 24.0 - 26.0 | 19.0 - 22.0 | - | Si: 1.50 max |
Market Shifts, Clean Energy Infrastructure, and Advanced Alloy Adaptations.
With massive investments in super-critical power stations and petrochemical hubs across the Americas, Europe, and Asia-Pacific, the demand for ASTM A213 grade tubing has experienced double-digit compound annual growth. These sectors require components that sustain high steam cycles without undergoing structural creep.
Hydrogen distribution networks require clean and highly reliable materials. ASTM A213 TP316L, with its excellent resistance to hydrogen embrittlement, is paving the way for safe distribution systems globally. Furthermore, solar thermal generation projects utilize these tubes to transfer heat via molten salts.
Offshore oil exploration is moving into deeper waters. Control umbilicals must withstand tremendous external pressures and resist highly corrosive saltwater environments. Our coiled tube configurations, reaching continuous lengths up to 10,000 meters, dramatically minimize weak orbital joints.
A Decade of Quality Manufacturing and Advanced Technology Integration from China.
Liaocheng Sihe Stainless Steel Material Ltd is a premier manufacturer and global exporter of high-grade stainless steel coiled tubes, capillary lines, heat exchanger pipes, and custom-formed plates. Backed by ten years of technological excellence and six dedicated production lines, our manufacturing floor strictly operates under ISO, GB, ASTM, ASME, JIS, and EN guidelines.
Our core capabilities range from small-scale high-precision capillary tubes to super-long seamless coiled configurations up to 32,800 feet (10,000 meters) in length. By integrating world-class online bright annealing technology, we eliminate surface oxidation while softening stainless steel tubing to achieve superior malleability and ductility.
Currently, over 80% of our production volume is exported directly to global markets including the United States, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe, where we serve as an approved tier-1 supplier for subsea exploration and energy infrastructure projects.
Delivering Zero-Defect Custom Metal Solutions Verified by Rigorous Quality Inspections.
Supports various materials (e.g., 304, 316L, 2205) and specifications (diameter 6.35mm to 19mm) for stainless steel coils.
Includes bending, spiral forming, precision drawing, and other processes tailored for heat exchangers.
Laser cutting, mechanical cutting, or flame cutting for high-precision and efficient material processing.
We devote ourselves to developing new products with state-of-art technologies, providing bright annealed and polished finishes.
Used in automotive exhaust systems, chemical pipelines, and precision instrument connections.
To produce stainless steel coiled and capillary tubing that functions under dynamic high-pressure loads, we employ high-efficiency bright annealing lines. The online softening treatment is executed within a high-purity hydrogen shielding gas environment, resulting in a scale-free, mirror-bright surface finish that guarantees excellent corrosion barrier characteristics.
Our Quality Management System conducts rigorous verification steps on each batch. We conduct 100% mechanical tests including flaring, flattening, hardness, tension/elongation, and high-pressure air tightness checks to ensure zero microstructure failures prior to shipment.
Our stainless steel tubes are utilized in key high-performance sectors across the globe.
High thermal conductivity, superior creep strength, and minimal oxidation profile.
Seamless coiled tube architecture prevents structural refrigerant leaks.
Excellent resistance to pitting, crevice corrosion, and aggressive acids.
High-quality mirror polishing ensures hygienic, sanitary media transfer.
Smooth inner surfaces mitigate biofilm deposits and bacterial growth.
Capable of managing superheater steam loops at critical temperatures.
Reliable performance against sulfide stress cracking (SSC) in oilfield flowlines.
Lightweight, high mechanical strength capillary tubing for hydraulic controls.
How Modern Metallurgy is Adapting to Tomorrow's Industrial Engineering Standards.
As global environmental regulations push for reduced carbon footprints, next-generation steam boilers operate at pressures exceeding 30 MPa and temperatures near 700°C. These advanced ultra-supercritical (A-USC) conditions exceed the capabilities of standard austenitic alloys. In response, our materials science division is optimizing nickel-base superalloys and high-chromium steel formulations (such as INCOLOY 800H and Inconel 625) to prevent grain boundary sliding and preserve high creep rupture limits over decades of operation.
With the rise of green hydrogen as a primary fuel source, preventing gas permeation in metal systems is critical. Hydrogen atoms can migrate into stainless steel microstructures, causing severe structural degradation. By refining the austenitic phase stability and maintaining a high nickel content (specifically above 12% in TP316/316L and Duplex varieties), our engineered tubes are designed to prevent hydrogen embrittlement, ensuring safety in clean energy applications.
At Liaocheng Sihe, we are integrating automated inspection systems directly into our six production lines. By pairing real-time eddy current testing with digital manufacturing logs, we capture dimension and micro-defect variations instantly. This data footprint provides customers in the military, aerospace, and semiconductor sectors with full traceability, certifying that every length of shipped coiled tubing meets precise engineering criteria.
Our Objective: Elevating continuous seamless coiled tube lengths while maintaining ultra-low dimensional tolerances (within ±0.05 mm) to support smart subsea umbilical and hydraulic assemblies.
Our products comply with global standards, ensuring safety and performance in all industrial projects.
Browse our main categories of structural tubing, coiled pipes, heat-exchanger lines, and customized metal sheets.
Featuring Duplex 2205 and Super Duplex 2507 options, providing high mechanical yields and localized corrosion barrier integrity.
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Designed with outer diameters starting from 0.125 inches (3.175mm) to 1 inch (25.4mm), ensuring tight tolerances for precision tools.
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Featuring high-alloy TP310S and Incoloy grades to combat high-temperature oxidation and thermal stress cycling.
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Technical and Commercial Solutions for Procurement Managers and Industrial Engineers.
Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contacts us for further information. We optimize our production scheduling to provide competitive pricing for large-scale projects.
Yes, we require all international orders to have an ongoing minimum order quantity depending on the specific pipe diameter and alloy class. If you are looking to resell or procure in smaller quantities, please contact our sales department or check out our website for stock availability.
Absolutely. We provide comprehensive documentation packages with every shipment, including Certificates of Analysis / Conformance (EN 10204 3.1/3.2), Mill Test Reports (MTR), heat treatment curves, insurance documents, Certificate of Origin, and all export documents required for customs clearance.
For samples and stock items, the lead time is about 7 days. For custom mass production, the average lead time is 20-30 days after receiving the deposit payment. Lead times become effective when: (1) we have received your deposit, and (2) we have your final approval for your technical drawing specifications.
We accept bank wire transfers (T/T), Western Union, and PayPal. Our standard terms are a 30% deposit in advance, and the remaining 70% balance paid against the copy of the Bill of Lading (B/L) or Letter of Credit (L/C).
We warranty our materials and workmanship. We guarantee that all products conform to the requested standards (e.g., ASTM A213, ASME SA213, EN 10216). Addressing and resolving client issues to mutual satisfaction is a core part of our business culture.
Yes, we use heavy-duty export packaging, including reinforced wooden cases, plastic end caps, and custom metal crates for coiled tubing to prevent transit deformation. Specialized hazard packing is applied for dangerous or heavy-duty industrial items.
Shipping costs depend on the delivery terms (FOB, CIF, CFR, DDU) and the transport method. Express shipping is fast but more costly, whereas seafreight is the most economical solution for bulk orders. Once we know your order volume, weight, and destination port, we will provide a precise freight quote.
Explore our high-performance capillary, welded, and coiled solutions for marine, nuclear, and chemical applications.
