Sihe Steel
Sihe Steel
410 Stainless Steel (UNS S41000) is a basic martensitic stainless steel that provides high mechanical strength, excellent wear resistance, and moderate corrosion resistance. As a high-carbon alloy relative to austenitic grades, Grade 410 can be hardened through heat treatment processes (quenching and tempering), making it uniquely suited for applications that experience severe stress and abrasive wear.
When drawn into precision capillary tubing, 410 stainless steel exhibits specific structural behaviors. Its mechanical characteristics depend largely on the heat-treated state. In the annealed condition, it maintains excellent ductility for cold drawing and shaping. Once hardened, its yield strength and tensile strength increase substantially, offering strong support against high internal pressures without permanent deformation.
International procurement teams face complex challenges when sourcing small-diameter tubes. For components used in instrumentation, hydraulic control lines, and sensor wells, consistency in wall thickness and inner diameter tolerances is essential. Globally, sourcing strategy is shifting towards manufacturers who can provide comprehensive quality validation documents, including Certificates of Analysis (COA), heat code traceability, and mill test certification conforming to international standards like ASTM, ASME, JIS, and EN.
Sourcing from established manufacturers like Liaocheng Sihe Stainless Steel Material LTD ensures access to specialized production capabilities. With dedicated bright annealing lines and comprehensive mechanical testing (flaring, flattening, tensile, and pressure integrity tests), sourcing teams can reduce quality risk, optimize lead times (7 days for samples, 20-30 days for mass orders), and secure consistent material characteristics.
Across demanding industries such as oil & gas, chemical processing, and aerospace, capillary tubes serve as critical components in control systems, chromatographic analysis, and micro-fluidic pathways. 410 capillary tubing is highly valued in oilfield downhole control lines, subsea umbilical systems, and mechanical instrumentation due to its high strength-to-weight ratio and resistance to wear under high mechanical loads.
Integrating these tubes into complex engineering systems requires high dimensional accuracy. Our manufacturing processes utilize specialized cold-rolling and precise drawing sequences to achieve narrow dimensional tolerances. This ensures leak-free connections with compression fittings in high-pressure and high-vibration environments.
Comprehensive metallurgical compositions and mechanical properties conforming to strict GB, ASTM, ASME, JIS, and EN standards.
| Material Standard | Chemical Composition (%) | Tensile Strength (MPa) | Yield Strength (MPa) | Hardness Range | Primary Application |
|---|---|---|---|---|---|
| AISI 410 (UNS S41000) | Cr: 11.5–13.5, C: 0.08–0.15, Mn: ≤1.00, P: ≤0.04, S: ≤0.03, Si: ≤1.00 | ≥ 480 (Annealed) / up to 1200 (Hardened) | ≥ 275 (Annealed) / up to 950 (Hardened) | HRB ≤ 96 (Annealed) / HRC ≥ 35 (Hardened) | Wear-resistant components, mechanical instrumentation, hydraulic valves |
| ASTM A269 304 | Cr: 18.0-20.0, Ni: 8.0-11.0, C: ≤0.08, Mn: ≤2.00, Si: ≤0.75 | ≥ 515 | ≥ 205 | HRB ≤ 90 | General chemical delivery, laboratory tubing, food processing lines |
| JIS SUS316L | Cr: 16.0-18.0, Ni: 12.0-15.0, Mo: 2.0-3.0, C: ≤0.03, Mn: ≤2.00 | ≥ 485 | ≥ 170 | HRB ≤ 90 | Marine engineering, subsea oil wells, pharmaceutical chromatography |
| Duplex 2205 (UNS S32205) | Cr: 22.0-23.0, Ni: 4.5-6.5, Mo: 3.0-3.5, N: 0.14-0.20 | ≥ 655 | ≥ 450 | HRC ≤ 32 | High-pressure oil & gas pipelines, subsea control lines |
Liaocheng Sihe Stainless Steel Material LTD is a leading manufacturer of high-quality stainless steel coiled tubes, stainless steel polishing tubes, and seamless coiled tubing. Utilizing six advanced production lines and proprietary bright annealing technologies, we produce precision tubing that complies with international standards, including GB, ASTM, ASME, JIS, and EN.
Our alloy capabilities cover a wide range of materials, from classic austenitic grades (304/304L, 316L, 321, 317L, 309S, 310S) and high-performance nickel alloys (INCOLOY 800/825, INCONEL 625) to high-strength duplex and super duplex structures (Duplex 2205, Super Duplex 2507).
Our precision tubing ranges from an outer diameter of 0.125 inch (3.175 mm) to 1 inch (25.4 mm), with wall thicknesses up to 0.165 inch (3 mm). We specialize in continuous coiled lengths up to 32,800 feet (10,000 meters) without orbital welds. This is critical for manufacturing subsea umbilicals and downhole injection systems, reducing leak risk and installation costs.
We implement comprehensive quality control procedures, including flare, flatting, expansion, bending, tensile strength testing, and 100% pneumatic/air tightness tests. Today, 80% of our production volume is exported to customers in North America, Europe, South America, and Southeast Asia.
Our manufacturing facilities adhere to strict ISO quality management protocols. Each product comes with complete material traceability.
We provide complete processing services to transform raw capillary tubes into ready-to-assemble sub-systems.
We process various materials (including 304, 316L, 410, and duplex 2205) in sizes ranging from 6.35 mm to 19 mm to meet specific industrial requirements.
Our production techniques include custom bending, spiral coiling, and precision drawing, designed specifically for installation in compact heat exchangers and flow systems.
We offer high-precision laser and mechanical cutting to deliver exact lengths with burr-free end finishes for clean installation.
Through bright annealing and chemical passivation, we develop corrosion-resistant surfaces with controlled reflectivity and minimal microscopic imperfections.
We provide flanged and flared tube ends to ensure secure mechanical connections in automotive exhaust, chemical dosing, and instrumentation applications.
All finished products undergo non-destructive eddy current testing, pneumatic pressure verification, and micro-hardness inspection to guarantee high performance under pressure.
Our tubing is engineered to perform reliably in demanding structural, chemical, and thermal conditions.
2205 duplex stainless steel combines austenitic and ferritic structures to provide high resistance to chloride stress corrosion cracking.
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Our 1/2-inch stainless steel coiled tubing is designed for subsea umbilicals and chemical injection lines in oilfield installations.
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Our 310 heat-resistant steel coiled tubing maintains mechanical integrity and oxidation resistance at high operating temperatures.
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As precision diagnostics and automation systems expand in chemical engineering, there is growing demand for capillary tubes with ultra-small outer diameters (down to 0.5 mm) and extremely smooth internal bores. Advanced cold drawing techniques and internal polishing processes are critical to reducing surface friction in micro-fluidic lines.
Modern high-pressure mechanical systems require capillary tubing that can withstand abrasion and heavy structural loads. Through precise heat treatment and chemistry optimization, 410 martensitic tubing offers a balance of wear resistance and moderate corrosion protection, making it a reliable choice for hydraulic actuators and safety valves.
The expansion of hydrogen fuel transport and clean energy systems requires high-strength capillary lines that are resistant to embrittlement. Ongoing development in metallurgical formulation and bright annealing processes ensures that our stainless steel capillary lines can meet these emerging mechanical requirements.
