Stainless steel / UNS S31000
310 is a 25% chromium, 20% nickel heat-resisting austenitic stainless steel with excellent oxidation resistance in continuous service up to about 1,100 °C.
- UNS S31000
- Spec ASTM A276
- Density 7.9 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | S31000 |
| Also known as | AISI 310 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.25 |
| Mn | — | 2.00 |
| P | — | 0.045 |
| S | — | 0.030 |
| Si | — | 1.50 |
| Cr | 24.0 | 26.0 |
| Ni | 19.0 | 22.0 |
| Fe | Bal. | — |
Mechanical properties
| Property | Value |
|---|---|
| Tensile strength (min) | 515 MPa (74.7 ksi) |
| Yield strength, 0.2% offset (min) | 205 MPa (29.7 ksi) |
| Elongation in 50 mm (min) | 40 % |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.9 g/cm³ | 0.285 lb/in³ |
| Magnetic response | Non-magnetic when annealed; may become slightly magnetic after cold work | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets, plates & coils | ASTM A240 / ASME SA240 | 0.3 mm – 6 mm |
| Seamless & welded pipe | ASTM A312 / ASME SA312 | 1/8" – 24" NB |
| Tubes | ASTM A213, A249, A269 | 1/8" – 24" NB |
| Bars & rods | ASTM A276, A479 | 3 mm – 500 mm |
| Flanges & forgings | ASTM A182 / ASME SA182 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A403 / ASME SA403 | 1/2" – 48" NB |
| Fasteners | ASTM A193 / A194, F593 / F594 | M3 – M56 |
Corrosion & temperature resistance
Corrosion resistance rises with chromium, molybdenum and nitrogen: 304 handles general atmospheric and food-contact service, 316/317 add resistance to chlorides and pitting, 904L handles strong reducing acids, and stabilised 321/347 resist intergranular attack after welding or high-temperature exposure.
Applications
SS 310: Furnace parts, burners, heat-treatment fixtures. Process piping, tanks and vessels, heat exchangers, food, dairy and pharmaceutical equipment, architectural work and general engineering.
SS 310 vs SS 310S
| SS 310 | SS 310S | |
|---|---|---|
| UNS | S31000 | S31008 |
| Key property | Oxidation resistance to ~1,100 °C | Heat resisting, lower carbon than 310 |
| Typical use | Furnace parts, burners, heat-treatment fixtures | Furnace linings, kilns, heat exchangers |
| Cr (wt %) | 24.0–26.0 | 24.0–26.0 |
| Ni (wt %) | 19.0–22.0 | 19.0–22.0 |
| Mo (wt %) | — | — |
| C (wt %) | ≤ 0.25 | ≤ 0.08 |
| Tensile / yield (min, MPa) | 515 / 205 | 515 / 205 |
Frequently asked questions
What is the UNS number of SS 310?
SS 310 is designated UNS S31000.
What is SS 310 used for?
Oxidation resistance to ~1,100 °C. Typical uses: furnace parts, burners, heat-treatment fixtures.
Is SS 310 magnetic?
Non-magnetic when annealed; may become slightly magnetic after cold work.
In which forms can I buy SS 310 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dairy Fittings, Dish Ends, SS Tanks, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with SS 310?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
What is the difference between SS 310 and SS 310S?
SS 310: oxidation resistance to ~1,100 °c. SS 310S: heat resisting, lower carbon than 310. See the comparison table on this page.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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