310S Stainless Steel
310S is a heat-resistant austenitic stainless steel with high chromium and high nickel. It is widely used in high-temperature, oxidizing service where parts must resist scaling and keep stable strength.
The “S” grade is the low-carbon option, which helps improve stability in welded fabrications. This page provides practical specifications, typical properties, and common supply forms for export projects.
Main advantage
High temperature oxidation resistance
Designed for hot service in oxidizing atmospheres.
Typical service (guidance)
Up to ~1100°C
Actual limit depends on atmosphere and thermal cycling.
Common identifiers
S31008 / SUS310S / 1.4845
Confirm the ordering standard before purchase.
Supply scope
Plate, sheet, coil, pipe, bar
Cut-to-size and processing available on request.
310S is commonly selected when standard grades such as 304, 316, or even 309S cannot meet the temperature requirement. The higher alloy content supports better scaling resistance and improved hot strength.
- Furnace parts such as burners, radiant tubes, muffles, retorts, and heat shields
- Kiln hardware, high-temperature fixtures, and heat treatment equipment
- Boiler components and hot gas ducting in oxidizing service
- Heat exchanger parts on the hot side, supports, and frames
- Thermal processing lines where repeated heating is expected
310S is referenced under multiple systems. Use the project specification as the ordering basis, then cross-check equivalents.
| System | Designation | Typical note |
|---|---|---|
| ASTM / ASME | A240 / SA240 Type 310S | Plate, sheet, and strip for heat-resistant service |
| UNS | S31008 | Unified numbering reference |
| JIS | SUS310S | Common in Japanese specifications |
| EN | 1.4845 | European material number |
| DIN | X8CrNi25-21 | Common cross-reference in documents |
| GB (common) | 0Cr25Ni20 | Seen in RFQs; confirm final code requirement |
310S is built around high chromium and high nickel to improve oxidation resistance at elevated temperature. Confirm chemistry and heat treatment on the mill test certificate.
| Grade | C | Cr | Ni | Mn | Si | P | S | Fe |
|---|---|---|---|---|---|---|---|---|
| 310S (A240 / SA240) | ≤0.08% | 24.0–26.0% | 19.0–22.0% | ≤2.0% | ≤1.5% | ≤0.045% | ≤0.03% | Balance |
Values depend on product form and thickness. Use these as a practical reference unless your order requires a different standard.
| Property | Typical minimum / limit | Unit |
|---|---|---|
| Tensile strength | ≥ 515 | MPa |
| Yield strength (0.2%) | ≥ 205 | MPa |
| Elongation | ≥ 40 | % |
| Hardness | ≤ 95 | HRB |
These values support engineering checks such as thermal movement and temperature cycling. Use your project standard for final design.
| Property | Typical value | Unit / note |
|---|---|---|
| Density | ~7.9 | g/cm³ |
| Thermal expansion (20–100°C) | ~15.9 | µm/m·°C |
| Thermal conductivity (at ~100°C) | ~14–15 | W/m·K |
| Specific heat | ~500 | J/kg·K |
| Modulus of elasticity | ~200 | GPa |
LYHSteel supports 310S in common flat products and tubular products. Availability depends on requested size, tolerances, and inspection scope.
| Form | Typical range | Notes |
|---|---|---|
| Sheet (cold rolled) | 0.3–6.0 mm; width 1000–2000 mm | 2B, BA, No.4, HL, mirror (by request) |
| Plate (hot rolled) | 3–100 mm; width 1000–2000 mm | Cut-to-length and edge trimming on request |
| Coil / Strip | CR 0.3–6.0 mm; HR 3–14 mm | Slitting available by tolerance |
| Seamless pipe | OD up to 610 mm; WT 1–100 mm | Hot service per specification |
| Welded pipe | OD 6–3000 mm; WT 1–100 mm | Size/spec dependent |
| Round bar | Ø 1–200 mm; length up to 12000 mm | Machining stock for hot service parts |
- Machining: More demanding than 304. Use stable feeds and good chip control to reduce work hardening.
- Welding: Suitable for TIG, MIG, and SMAW. Filler selection should match service and code requirements.
- Forming: Good ductility, but higher alloy content may require stronger tooling and controlled forming steps.
- Heat treatment: Solution anneal is commonly in the 1030–1180°C range followed by rapid cooling.
309S is often used for high-temperature parts, but 310S is typically selected when the duty temperature is higher or scaling risk is stronger. Where atmospheres include sulfur or strong reducing conditions, higher alloy options may be evaluated.
Use these internal tools to confirm equivalents, estimate weight, and validate tolerances before issuing an RFQ.
What is 310S stainless steel used for?
310S is commonly used for furnace parts, kiln equipment, heat treatment fixtures, heat shields, and hot-side components where oxidation resistance is required.
What does the “S” mean in 310S?
The “S” indicates a low-carbon grade. It helps reduce carbide precipitation risk during welding and supports more stable performance in welded fabrications.
Is 310S magnetic?
310S is generally non-magnetic in the annealed condition. After cold working, it may show slight magnetism.
What should I include in a 310S RFQ?
Include the standard, product form, dimensions, tolerances, surface finish, quantity, testing requirements (MTC, PMI, NDT), and the operating temperature and atmosphere. These details support correct mill routing and inspection planning.
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