Sihe Steel
Sihe Steel
Direct manufacturer-to-factory pipeline offering high quality coiled tubes, precision polished lines, and custom engineered alloys.
In-depth metallurgical evaluation of 310S (UNS S31008) alloy capillary tubes under thermal deformation, high oxidation pressure, and structural stress.
Grade 310 Stainless Steel (UNS S31000) and its low-carbon derivative, 310S (UNS S31008), are highly alloyed austenitic stainless steels engineered for high-temperature service. Benefiting from a robust chemical composition of 24% to 26% Chromium and 19% to 22% Nickel, these alloys exhibit outstanding oxidation resistance under mildly cyclic conditions up to 1035°C, and in continuous atmospheres up to 1150°C.
The high chromium content promotes the rapid formation of a self-healing chromium-oxide protective film. Meanwhile, the rich nickel matrix stabilizes the austenitic structure, offering enhanced resistance to carburizing, nitriding, and moderate sulfidation atmospheres compared to traditional 304 or 316 grade alloys. This makes 310S capillary tubing the premium choice for chromatography columns, core oil-and-gas control lines, and sensor wells subjected to continuous thermal stresses.
1. Creep Strength: Superior resistance to creep deformation under elevated loads compared to ferritic stainless steels.
2. Low-Carbon Stability: Carbon content capped at 0.08% max prevents intergranular carbide precipitation during welding or long thermal exposure.
3. Anti-Scaling Properties: Adherent scale resistance that reduces downstream contamination in high-purity applications.
Precision cold drawing is crucial to maintaining capillary tube integrity. We ensure tolerances meet or exceed ASTM A632 specifications, down to ±0.01 mm for outer diameter (OD) and inner diameter (ID). Our processing pipeline guarantees high concentricity and a smooth inner wall surface finish (Ra ≤ 0.4 μm) to minimize drag and prevent fluid turbulence in precision instruments.
By controlling structural mechanical parameters, our capillary tubes provide excellent bendability and workability, enabling flawless orbital welding, flanging, and micro-spiral bending without wall thinning or cracking.
Leveraging state-of-the-art bright annealing lines and advanced engineering to deliver globally compliant B2B steel solutions.
Operating out of Liaocheng, China, Liaocheng Sihe Stainless Steel Material LTD is a leading expert in the manufacturing of stainless steel coiled tubes, stainless steel polishing tubes, and stainless steel seamless coiled tubing. Utilizing six advanced production lines, we strictly adhere to international quality standards including GB, ASTM, ASME, JIS, and EN.
Our material catalog extends beyond standard 304/304L and 316L, incorporating specialized grades such as 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625. Our capacity to execute bright annealing processes ensures that our tubes retain maximum microstructural flexibility and oxidation resistance without surface scale, meeting requirements for demanding aerospace, military, and semiconductor applications.
We perform rigorous quality control testing on 100% of our products, including compression, flaring, bending, tensile strength, hardness, and air tightness tests, establishing ourselves as a reliable B2B supplier for international projects.
Bespoke metallurgical fabrication supporting specialized applications with tight engineering tolerances.
Supports various materials (e.g., 304, 316L, 2205, 310S) and specifications (diameters from 6.35mm to 19mm and custom capillary dimensions) for stainless steel coils.
Includes bending, custom spiral forming, precision drawing, and coil configuration tailoring designed for heat exchangers and compact heating systems.
High-precision laser cutting, mechanical cutting, and computer-controlled flame cutting ensure clean cuts with minimal deformation of the tube cross-section.
Advanced mechanical polishing, electrochemical polishing, and chemical passivation. We commit to developing high-grade surface treatments for ultra-clean industrial needs.
Precision flanging used in automotive exhaust networks, chemical transfer pipelines, and high-pressure instrument connections to ensure leak-proof seals.
Engineered for stability and reliability in extreme temperatures, high pressure, and corrosive environments.
High thermal transfer properties combined with 310S thermal stability make it ideal for furnace tubes, radiant systems, and high-temp steam superheaters.
Precision capillary dimensions are ideal for expansion lines and gas regulators, maintaining consistent pressure flow under cycling loads.
Resists chemical attack and stress corrosion cracking in high-temperature organic acid, ester, and sulfur atmospheres.
Ultra-smooth electropolished ID restricts biological adhesion and complies with strict food hygiene standards.
Seamless design eliminates weld crevices, ensuring contamination-free fluid delivery in biomedical and chromatography systems.
Designed for thermal load monitoring, steam line sensing, and flue gas analytics under high thermal and corrosive stresses.
Ideal for high-pressure control lines and subsea chemical injection systems exposed to hydrogen sulfide gas.
High strength-to-weight ratio and fatigue resistance make it suitable for aerospace instrumentation, fuel injectors, and structural sensors.
Every shipment is backed by international quality certifications and comprehensive testing reports to ensure standard compliance.
Our quality management system is ISO 9001:2015 certified. We can provide standard Mill Test Certificates (MTC) in accordance with EN 10204 3.1, including chemical analysis, mechanical property test reports (tensile, hardness), and non-destructive eddy current testing to guarantee structural reliability.
Explore our core product lines, designed to meet diverse engineering and heavy industrial needs.
2205 duplex stainless steel containing balanced austenitic and ferritic microstructures for high strength and corrosion resistance.
1/2 inch stainless steel coiled tubing refers to a continuous coil optimized for gas transport and downhole hydraulic control.
Specialized high-temperature resistant coiled tubing lines manufactured directly in China factories.
High precision micro-bore tubing options.
High thermal transfer options.
Industrial structural plates.
Corrosion resistant surface sheeting.
Specialized coils and micro-tubing.
Custom drawn tubes designed to reduce pressure drops.
Spiral-wound assemblies.
100% leak-proof verification.
Protective packaging for maritime transit.
Engineered for thermal expansion resilience.
Get answers to technical, commercial, and logistical queries regarding our stainless steel products.
Explore our full range of duplex steel coils, heat exchanger pipes, and polished stainless steel sheets.
