We are Riddhi Siddhi Impex, a Mumbai-based supplier and stockist of Stainless Steel 310S Sheets & Plates, established in 2002. We hold ready stock of ASTM A240 / ASME SA-240 flat products from 3.8 mm. Our ISO 9001, 14001, and 45001-certified company ships pan-India and worldwide. We also hold a supply capacity of 400-500 tonnes monthly with EN 10204 Type 3.1 / 3.2 mill test certificates on request.
Stainless Steel 310S sheets and plates are high-chromium, high-nickel austenitic products engineered for sustained high-temperature service up to 1150°C. With 24-26% chromium and 19-22% nickel, it grows a stable oxide scale that resists scaling in air to about 1050 °C. The low 0.08% maximum carbon separates 310S from plain 310, cutting carbide precipitation during welding. It also stays tough at cryogenic temperatures, widening use beyond furnaces. These sheets and plates typically used for high-temperature furnace parts, heat exchangers, and cryogenic components.
We stock these 310S stainless steel sheets and plates as part of our Stainless Steel Sheets & Plates range, held to ASTM A240 / ASME SA-240 from 3.8 mm cold-rolled sheet through hot-rolled plate, in widths to 2000 mm. Both forms sit annealed with No.1 and 2B finishes at our Mumbai and Taloja warehouses. Each dispatch carries EN 10204 Type 3.1 or 3.2 mill test certificates on request.
We provide Stainless Steel 310S sheets and plates to ASTM A240 / ASME SA-240 in annealed condition, in cold-rolled sheet and hot-rolled plate, with No.1 and 2B finishes and custom lengths to order.
| Parameter | Details |
|---|---|
| Standard | ASTM A240 / ASME SA-240 (general: ASTM A480) |
| Thickness (Sheet) | 3.8 mm to 6 mm |
| Thickness (Plate) | 6 mm and above |
| Width | 1000, 1250, 1500, 2000 mm |
| Length | 2000, 2500, 6000 mm; custom |
| Surface Finish | No.1 (For Hot Rolled Plate), 2B (For Cold Rolled Sheet) |
| Form | Hot Rolled Plate, Cold Rolled Sheet |
| Condition | Annealed |
Chromium at 24-26% drives the oxidation resistance of this grade, forming the protective scale that lets 310S run near 1050 °C. Nickel at 19-22% keeps the austenite stable. Full ASTM A240 limits appear below.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulphur (S) | 0.030 max |
| Silicon (Si) | 1.50 max |
| Chromium (Cr) | 24.0-26.0 |
| Nickel (Ni) | 19.0-22.0 |
| Iron (Fe) | Balance |
Tensile strength governs how 310S sheet and plate behave under load. The grade holds a 515 MPa minimum tensile strength and 205 MPa minimum yield, with 40% elongation for cold forming. Values follow ASTM A240 for annealed flat products.
| Property | Value |
|---|---|
|
Tensile Strength (min)
|
515 MPa (75 ksi) |
|
Yield Strength, 0.2% offset (min)
|
205 MPa (30 ksi) |
|
Elongation in 50 mm (min)
|
40% |
|
Hardness (max)
|
217 HBW / 95 HRB |
International buyers can match 310S to their local standard using the cross-reference below. UNS S31008 carries direct equivalents across European, Japanese, Chinese, and French designations.
| Country / Standard | Designation |
|---|---|
| USA (UNS) | S31008 |
| Europe (EN) | X8CrNi25-21 |
| Germany (W.Nr) | 1.4845 |
| Japan (JIS) | SUS 310S |
| China (GB) | 06Cr25Ni20 |
| France (AFNOR) | Z8CN25-20 |
| Russia (GOSTT) | 20Х23Н18 |
These 4 industries widely utilise the 310S stainless steel plate and sheet we supply, each picking the grade for oxidation resistance and high-temperature strength.
Heat treaters line furnace muffles, retorts, radiant tubes, and annealing boxes with 310S plate. The 25% chromium builds a tenacious oxide that stays adherent through repeated cycling to about 1035 °C. Nickel near 20% stabilises the austenitic structure at elevated temperatures.
Refineries install 310S sheet into thermowells, catalyst supports, and sulphur-recovery equipment. The grade resists oxidising atmospheres and outperforms most heat-resistant stainless steels in reducing and carburising conditions. 310S handles sulphur-bearing gases, but the temperature limit drops: roughly 950 °C where sulphur exceeds 2 g/m³, and about 1000 °C in low-oxygen atmospheres.
The 310S plate is used in ash handling sections, duct linings, and superheater supports in coal and biomass boilers. 310S holds its shape well under load, but for sustained mechanical load above roughly 980 °C, 310H (S31009) is the better choice because its controlled 0.04-0.10% carbon gives higher creep strength. We can supply either grade; ask us if your parts carry load at temperature.
Bakery ovens, roasting lines, and sterilising units use 310S sheet where hot, humid conditions corrode lesser grades. The smooth stainless steel surface is easy to clean and suitable for food-contact equipment. Its chromium-nickel matrix resists scaling on trays, conveyors, and oven panels.
Export orders issued from our Mumbai and Taloja warehouses are packed for sea freight.
| Parameter | Details |
|---|---|
| Packaging | Wooden cases, pallet packing |
| Incoterms | FOB, CIF, CFR, EXW Mumbai |
| Dispatch Points | Mumbai and Taloja warehouses |
| Standard Lead Time | 4 to 5 days |
| Urgent Dispatch | 2 to 3 days |
| Payment Terms | Advance, credit, LC |
| Certification | EN 10204 Type 3.1 / 3.2 on request |
The price of Stainless Steel 310S sheet and plate in India is between ₹300 to ₹580 per kg. Globally, the prices are around $3.60 to $6.00 per kg. Your actual price will vary according to real-time nickel alloy surcharges, thickness, surface finishes, and total order volume. Contact us for an accurate, up-to-date price for your project today.
The main difference between SS 310 and SS 310S is carbon content. SS 310S caps carbon at 0.08% against 0.25% for SS 310, which lowers carbide precipitation during welding and keeps corrosion resistance intact through the heat-affected zone.
SS 310S plates hold up in continuous service to about 1050 °C in air. The 24-26% chromium and 19-22% nickel form a stable oxide scale that resists spalling. Intermittent cycling service is rated slightly lower.
Yes, SS 310S sheets and plates may be easily welded by TIG, MIG, and manual arc procedures. ER310 or E310 is the preferred filler. Post-weld heat treatment is usually not needed due to the low carbon concentration, which prevents carbide precipitation.
All consignments of SS 310S sheets and plates are accompanied by EN 10204 Type 3.1 or 3.2 mill test certifications on request. Complete traceability on demand in the form of test data sheets and material property paperwork.
You can buy SS 310S plates in India from us at Riddhi Siddhi Impex. Our Mumbai and Taloja warehouses hold ready stock of 310S sheet and plate for pan-India supply and export. Send your size and grade requirements to get a quote within 24 hours.
