Sihe Steel
Sihe Steel
ASTM A269 covers nominal-wall-thickness, seamless, and welded austenitic steel tubing for general service. This specification is designed to provide high levels of corrosion resistance, mechanical stability, and dimensional precision across critical sectors including semiconductor processing, pharmaceutical production, subsea hydraulic systems, and chemical process control. Standard-grade tubing produced to ASTM A269 guidelines is subject to strict non-destructive electric tests, hydrostatic tests, flaring, flange, hardness, and tension tests to ensure structural integrity in high-vibration and cryogenic configurations.
Liaocheng Sihe Stainless Steel Material LTD specializes in optimizing the chemical balance and cold work processes of these alloys to surpass international standards, ensuring consistent, defect-free supply chains for global procurement teams.
Selecting the appropriate metallurgical compound requires a comprehensive understanding of pitting resistance, yield strength, and structural performance. In many applications, utilizing standard 304 stainless steel is cost-effective, but harsh marine or high-temperature acidic processes necessitate advanced duplex and nickel superalloys.
| Alloy Grade | UNS Code | PREN Value | Yield Strength (MPa) | Key Mechanical Characteristics | Typical Environment |
|---|---|---|---|---|---|
| 304 / 304L | S30400 / S30403 | 18.0 - 20.0 | ≥ 205 | General-use corrosion resistance, excellent formability. | HVAC, food processing, structural tubing. |
| 316 / 316L | S31600 / S31603 | 23.0 - 25.0 | ≥ 220 | Enhanced molybdenum content prevents pitting in mild chlorides. | Pharma, aerospace, chemical instrumentation. |
| Duplex 2205 | S32205 / S31803 | 32.0 - 35.0 | ≥ 450 | Dual-phase matrix provides double the yield strength of austenitic steel. | Deep sea oil & gas, harsh chemical reactors. |
| Incoloy 825 | N08825 | 31.0 - 33.0 | ≥ 240 | Nickel-iron-chromium base, outstanding resistance to oxidizing acids. | Sour gas wells, sulphuric acid processing plants. |
| Inconel 625 | N06625 | ≥ 45.0 | ≥ 415 | Cryogenic to 1000°C resistance, virtually immune to chloride cracking. | Nuclear plants, deepwater umbilical lines. |
The addition of nitrogen in Duplex 2205 allows for thinner wall dimensions without compromising structural pressure limits, reducing logistical costs. Meanwhile, 316L remains the golden standard for pharmaceutical and food environments due to its low carbon profile (≤ 0.03%), which limits chromium carbide precipitation during welding and post-fabrication processes.
To produce tubing of ultra-long lengths up to 32,800 feet (10,000 meters) without welds, a high level of cold-drawing precision is required. At Liaocheng Sihe, we implement an innovative Online Bright Annealing (BA) process. Conducted under a dry hydrogen shielding atmosphere, this heat treatment prevents oxidation, maintaining a bright, highly reflective internal and external surface finish.
Furthermore, our rigorous testing protocol ensures zero failure rates on deliveries. These include:
Liaocheng Sihe Stainless Steel Material LTD operates a centralized manufacturing complex in Shandong, China. By sourcing raw steel from tier-one state-owned mills and performing all cold drawing, bright annealing, coil spooling, and non-destructive testing under one roof, we achieve significant price optimization. This centralized layout eliminates mid-chain logistical overhead and allows us to provide wholesale pricing configurations that are significantly more competitive than Western suppliers.
For international procurement compliance, our products conform to GB, ASTM, ASME, JIS, and EN standards. We handle complex customs routing and offer localized compliance assurance, ensuring that every shipment arriving in Europe, North America, or Southeast Asia is accompanied by fully traceable Mill Test Reports (MTRs) according to EN 10204 3.1, raw material origin certificates, and pressure test documentation.
Supports variable raw materials (e.g., 304, 316L, 2205, 825) and specialized dimensions from outer diameters of 6.35mm to 19mm for high-pressure coils.
Advanced in-house cold drawing, tight-loop spiral forming, CNC bending, and precision extrusion specifically configured for compact industrial heat exchangers.
Utilizes multi-axis laser cutting and planetary mechanical rotary straightening to ensure close length tolerances and burr-free end preps.
State-of-the-art electrochemical polishing and pickling lines guarantee high cleanliness levels required by sanitary semiconductor applications.
High-integrity lap joint flanging and end-forming engineered for reliable installation in automotive exhaust lines and chemical transport pipelines.
Liaocheng Sihe Stainless Steel Material LTD is a world-class manufacturing authority specializing in cold-drawn seamless stainless steel coiled tubing, high-precision instrumentation tubing, and heat exchanger pipes. With multiple modern processing units operating in Shandong, China, our company provides technical solutions matching global specifications including ASTM A269, ASTM A213, ASME SA213, EN 10216-5, and JIS G3459.
Our material database spans standard austenitic grades like 304/304L and 316/316L to high-alloy configurations including Duplex 2205, Super Duplex 2507, Alloy 825 (UNS N08825), and Alloy 625 (UNS N06625). Over the years, we have positioned ourselves as an essential tier-one supplier for challenging operations like deepsea subsea control systems, cleanroom semiconductor gas delivery lines, precision optical fiber encasing, and petrochemical processing systems.
Through our dedicated research division, we have solved the technical challenge of manufacturing super-long, continuous heat exchanger coils. Offering continuous lengths up to 32,800 feet (10,000 meters) without orbital welds, we assist clients in reducing leak paths and saving installation time.
Duplex 2205 combines high tensile strength and pitting resistance for offshore service.
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High ductility bright annealed coiled tubing ideal for hydraulic and instrumentation lines.
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Austenitic chromium-nickel alloy designed for high-temperature oxidation environments.
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Seamless micro-bore tubes for medical, analytical, and sensor control setups.
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Pre-formed and stress-relieved configurations ready for shell and tube assemblies.
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Highly resistant to stress corrosion cracking and pitting in acid environments.
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Handles extreme burst pressures in mining, deepwater drilling, and automotive systems.
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Resistant to cyclic oxidation and corrosion under mechanical fatigue conditions.
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Chemically clean and smooth inside diameter, for gas chromatography lines.
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Hot-rolled and cold-rolled stainless sheets with customized finish treatment.
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High mechanical strength and flatness index sheet for processing frames.
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Premium corrosion protection for downhole control lines and chemical injection.
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Fully certified pre-fabricated configurations designed to minimize on-site pipeline installation time and avoid structural leaks in complex layout requirements. Ideal for automotive exhaust, marine umbilical pipelines, and specialized refrigeration loops.
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