Stainless 310S (UNS S31008) is a 25Cr-20Ni high-chromium-nickel austenitic grade with carbon ≤ 0.08%. It has outstanding oxidation resistance and high-temperature strength below 1100 °C, making it the standard for furnace parts, heat-treat fixtures and radiant tubes.
As a manufacturer and global exporter of special alloys since 2012, Shanghai Hangbo Alloy Group Co., Ltd. supplies Stainless Steel 310S as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), forgings & rolled rings (up to 7500 kg, 3500 mm OD), welding wire & coils (1.0–5.0 mm) — all with EN 10204 3.1 certified material test reports.
Stainless Steel 310S Chemical Composition (wt%)
| Element | Content (wt%) | Element | Content (wt%) |
|---|---|---|---|
| Fe (铁) | Balance | Si (硅) | ≤ 1.50 |
| Cr (铬) | 24.0–26.0 | C (碳) | ≤ 0.080 |
| Ni (镍) | 19.0–22.0 | P (磷) | ≤ 0.045 |
| Mn (锰) | ≤ 2.00 | S (硫) | ≤ 0.030 |
Stainless Steel 310S Mechanical Properties
| Property | Value |
|---|---|
| Tensile strength (Rm) | ≥ 515 MPa |
| Yield strength (Rp0.2) | ≥ 205 MPa |
| Elongation (A) | ≥ 40 % |
| Hardness | ≤ 217 HB |
| Density | 7.98 g/cm³ |
| Melting range | 1398–1454 °C |
| Thermal conductivity | 14.2 W/m·K |
| Young's modulus | 200 GPa |
| Max service temperature | 1100 °C (continuous oxidation) |
Key Advantages
- 25Cr-20Ni — oxidation resistant up to 1100 °C
- Strong creep and rupture strength at temperature
- Low carbon gives good post-weld intergranular corrosion resistance
- Watch for high-temperature corrosion in sulphidising atmospheres
Relevant Standards
- ASTM A276
- ASTM A240
- ASTM A312
- ASTM A182
- UNS S31008
Typical Applications
- Furnace rolls, radiant tubes and hearth rolls
- Heat-treat fixtures and baskets
- Petrochemical cracking and reformer tubes
- Burner nozzles and high-temperature piping
- Cement and metallurgical high-temperature parts
Why Buy from Hangbo Alloy?
- Factory-direct manufacturer — founded 2012, headquartered in Shanghai Qingpu
- Full product range — bar, plate, sheet, strip, tube, forging, welding wire, flanges and machined parts
- Certified quality — ISO 9001:2015, GB/T 19001-2016, GJB 9001C-2017, EN 10204 3.1 mill test certificates with third-party inspection (SGS / BV / TUV) available on request
- Complete mill documentation — chemical analysis, mechanical test, ultrasonic test (UT), hardness and grain-size reports with every shipment
Contact Us — Shanghai Hangbo Alloy Group Co., Ltd.
Shanghai Hangbo Alloy Group Co., Ltd.
📍 No. 388 Songhuang Road, Qingpu District, Shanghai, China
📞 Tel / WhatsApp: +86 15618279078
✉️ Email: demi@nickel-alloy.com
🕒 Available 24 hours a day, 7 days a week — enquiries answered around the clock.
Send your drawing or enquiry (grade, form, size, quantity, standard) for a same-day quotation.
Frequently asked questions
How do I choose between 310S and 309S?
Both are 25Cr/20–22Ni heat-resistant grades. 310S has slightly higher nickel (~20%) and chromium (~25%) and a higher oxidation limit (~1100 °C) with better cyclic oxidation stability. 309S carries ~22% Ni and is typically used for 900–1000 °C furnace parts and automotive exhaust manifolds. Pick 310S for long-term service above 1000 °C or where higher creep life is required; 309S is fine for sub-950 °C service where weldability and cost matter more.
What forms and sizes are available?
We supply Stainless Steel 310S as round bars (φ2–600 mm, up to 12 m), plates & sheets (0.5–100 mm thick, up to 2500 mm wide), seamless tubes & pipes (φ6–630 mm OD, 0.5–40 mm wall), forgings & rolled rings (up to 7500 kg, 3500 mm OD), welding wire & coils (1.0–5.0 mm). Custom lengths, tolerances and machining to drawing are available on request.
What is the MOQ and lead time?
MOQ is flexible — trial orders from a single piece are welcome. Stock sizes ship in 3–7 days; custom forgings and machined parts typically 15–35 days depending on quantity and process.
Can you provide third-party inspection and shipping to my port?
Yes. SGS / BV / TUV or your nominated inspector can witness all tests before shipment. Full export documentation is provided, and we ship worldwide by sea or air on FOB, CIF or DDP terms.