310S Austenitic Heat-Resistant Stainless Steel Coil Tube
Wenzhou Jixing Metal Materials Co., Ltd presents a premium-grade 310S stainless steel coil tube engineered for the most demanding high-temperature industrial applications. As a specialist in austenitic heat-resistant alloys, Wenzhou Jixing delivers coil tubes that combine exceptional thermal stability, outstanding oxidation resistance, and superior structural integrity at temperatures far beyond those tolerable by conventional stainless steels.
Product Overview
The 310S coil tube represents the pinnacle of austenitic heat-resistant stainless steel performance. Classified under the austenitic heat-resistant alloy family, this product is formulated with a 25% chromium and 20% nickel composition (25Cr-20Ni), providing an extraordinary continuous service temperature of up to 1050°C (1922°F). The coil tube format offers significant advantages in fabrication efficiency, material utilization, and downstream processing flexibility, making it an ideal solution for large-scale industrial projects requiring consistent quality and rapid deployment.
Wenzhou Jixing Metal Materials Co., Ltd leverages advanced metallurgical expertise and precision manufacturing capabilities to produce 310S coil tubes that meet the exacting standards of international industrial sectors. Each coil tube is manufactured to ensure uniform wall thickness, precise dimensional tolerances, and consistent mechanical properties throughout the entire length of the coil.
Material & Properties
The 310S grade is a low-carbon modification of the classic 310 austenitic stainless steel, specifically designed to resist intergranular corrosion during welding and high-temperature service. The reduced carbon content (≤0.08%) significantly improves weldability while maintaining the exceptional heat resistance inherent to the high chromium-nickel alloy system.
- Composition: 25% Chromium, 20% Nickel, with controlled levels of carbon, manganese, silicon, and other alloying elements
- Microstructure: Fully austenitic at all service temperatures, ensuring no phase transformation and no embrittlement under prolonged thermal cycling
- Oxidation Resistance: Forms a dense, self-healing chromium oxide scale that protects the base metal against rapid oxidation in air and non-corrosive gas atmospheres
- Thermal Stability: Maintains tensile strength and structural integrity at temperatures exceeding 1000°C, far surpassing 304, 310, and 316 grades
- Weldability: Excellent weld performance without preheating; the low-carbon formulation minimizes the risk of intergranular carbide precipitation
- Formability: Good cold and hot working characteristics, suitable for bending, rolling, and forming into complex geometries
- Corrosion Resistance: Superior resistance to sulfurization and scaling in high-temperature environments compared to standard austenitic grades
Specifications
| Parameter | Specification |
|---|---|
| Material Grade | 310S (UNS S31008 / 1.4845) |
| Chemical Composition (Cr) | 24.0 – 26.0% |
| Chemical Composition (Ni) | 19.0 – 21.0% |
| Chemical Composition (C) | ≤ 0.08% |
| Chemical Composition (Mn) | ≤ 2.0% |
| Chemical Composition (Si) | ≤ 1.0% |
| Chemical Composition (S) | ≤ 0.03% |
| Chemical Composition (P) | ≤ 0.045% |
| Continuous Service Temperature | Up to 1050°C (1922°F) |
| Intermittent Service Temperature | Up to 1150°C (2092°F) |
| Tensile Strength (RT) | ≥ 520 MPa (75 ksi) |
| Yield Strength (0.2% offset) | ≥ 205 MPa (30 ksi) |
| Elongation | ≥ 40% |
| Thermal Conductivity (100°C) | ~16.3 W/(m·K) |
| Density | 8.0 g/cm³ |
| Available Forms | Seamless Coil Tube, Welded Coil Tube |
| Surface Finish | Pickled & Annealed (2B), No. 4 Brushed, Polished |
| Standards | ASTM A213 / ASME SA-213, ASTM A313, EN 10216-5, GB/T 12770 |
Manufacturing Process
Wenzhou Jixing Metal Materials Co., Ltd employs a rigorous, multi-stage manufacturing process to ensure the highest quality 310S coil tubes:
- Raw Material Selection: High-purity 310S stainless steel billets and strip are sourced from certified foundries, with full chemical analysis and traceability documentation for every heat number.
- Hot Rolling / Seamless Piping: The material undergoes precision hot rolling or seamless piercing to achieve the target outer diameter and wall thickness with tight dimensional tolerances.
- Coil Winding: The continuous-length tube is wound onto mandrels to form coils, minimizing cutting waste and enabling efficient downstream fabrication. Coil diameters and lengths are tailored to customer specifications.
- Solution Annealing: Tubes are solution-annealed at approximately 1050–1150°C followed by rapid quenching to restore full austenitic microstructure, relieve residual stresses, and ensure maximum corrosion and heat resistance.
- Pickling and Passivation: The surface is acid-pickled to remove oxide scale formed during annealing, followed by passivation treatment to establish a protective chromium oxide film.
- Quality Inspection: Every coil tube batch undergoes ultrasonic testing (UT), hydrostatic pressure testing, dimensional verification, chemical analysis, and mechanical property testing to confirm compliance with specified standards.
- Protective Packaging: Tubes are wound, wrapped in protective material, and secured with steel strapping and wooden crates to prevent mechanical damage and corrosion during transit.
Applications
The 310S coil tube is purpose-engineered for extreme-temperature industrial environments where conventional stainless steels fail. Key application areas include:
- Furnace Internal Components: Construction of furnace linings, support structures, heat shields, and internal fixtures operating at sustained temperatures exceeding 1000°C. The coil format facilitates the fabrication of curved and contoured furnace parts with minimal welding.
- Radiant Tubes: Critical heat-transfer elements in petrochemical reformers, glass furnaces, and heat treatment kilns. The 310S alloy maintains structural integrity and resists scaling under intense radiant heat flux.
- High-Temperature Flue Gas Waste Heat Recovery: Heat exchanger tubes and recuperator elements that capture thermal energy from exhaust gases at temperatures up to 1050°C, improving overall process energy efficiency.
- Industrial Kiln Components: Heating elements, burner supports, and structural members in cement, ceramic, and metallurgical kilns.
- Exhaust Systems: High-temperature exhaust ducts and muffler components in power generation and heavy industrial applications.
- Aerospace and Energy: Turbine exhaust components, heat shield elements, and high-temperature structural applications requiring sustained performance above 1000°C.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains comprehensive quality management systems and holds the following certifications and standards compliance:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and continuous improvement
- ISO 14001 — Environmental Management System certification
- Product Standards: ASTM A213/SA-213, ASTM A313, EN 10216-5, GB/T 12770, JIS G3459
- Mill Test Certificates (MTC): Every shipment is accompanied by a full EN 10204 3.1 Mill Test Certificate documenting chemical composition, mechanical properties, heat number, and inspection results
- Third-Party Inspection: Available upon request through SGS, BV, or TUV for independent verification
- Traceability: Complete heat-to-heat traceability from raw material through final product, ensuring full accountability and quality assurance
Why Choose Wenzhou Jixing 310S Coil Tube
Unmatched Heat Resistance: Continuous service up to 1050°C sets this alloy apart from all other stainless steel grades, making it the definitive solution for ultra-high-temperature applications.
Coil Format Advantage: The coil tube configuration maximizes material utilization, reduces fabrication time, minimizes waste, and enables the production of complex curved geometries with minimal joints and welds.
Superior Oxidation & Scaling Resistance: The 25Cr-20Ni composition provides the highest oxidation resistance among austenitic stainless steels, extending component life and reducing maintenance costs.
Excellence in Weldability: The low-carbon 310S formulation ensures reliable welding performance without preheating, simplifying fabrication and reducing production costs.
Comprehensive Quality Assurance: From certified raw materials through rigorous multi-stage inspection, every coil tube batch meets or exceeds international standards.
For projects demanding reliability at extreme temperatures, Wenzhou Jixing Metal Materials Co., Ltd stands as a trusted manufacturer of 310S stainless steel coil tubes — delivering performance, precision, and peace of mind.