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Stainless Steel 321 Sheet, Plate & Coil are popular austenitic stainless steel products known for their strength, cost efficiency, and versatility. SS 321 is a chromium-nickel-manganese alloy designed to be a lower-cost alternative to grades like 304. It offers a perfect balance of hardness, corrosion resistance, and formability for both industrial and decorative applications.
SS 321 Sheets and Plates are manufactured from high-quality raw materials that comply with ASTM A240 / ASME SA240 standards. These materials exhibit excellent toughness, good drawability, and high resistance to wear and abrasion. Stainless Steel 321 can be easily fabricated, welded, and polished, making it ideal for products requiring durability and a clean finish.
The chemical composition of Stainless Steel 321 includes about 16–18% chromium, 4–6% nickel, and up to 7.5% manganese. This unique composition enhances its strength and gives it good resistance to oxidation and mild corrosion. Though not as corrosion-resistant as 304 or 316, SS 321 performs well in mildly corrosive environments and indoor applications.
Stainless Steel 321 Coils are available in both hot-rolled and cold-rolled forms, with a wide range of thicknesses and finishes such as 2B, BA, and No.4. These coils are often used to produce kitchen utensils, decorative panels, railway coaches, sinks, and appliances. Their bright, attractive surface finish also makes them suitable for architectural and interior design applications.
SS 321 Sheets and Plates offer an excellent combination of strength and toughness even at low temperatures. They are known for their good work-hardening ability, allowing manufacturers to form or bend them easily without cracking. The alloy’s mechanical properties make it a reliable choice for light structural components and machinery parts.
Stainless Steel 321 Sheet, Plate & Coil are widely used in industries such as construction, food processing, automotive, and furniture manufacturing. Their aesthetic appearance and cost-effectiveness make them a preferred material for kitchenware, countertops, appliances, and other decorative purposes where corrosion exposure is minimal.
Welding and fabrication of SS 321 can be done using standard methods such as TIG, MIG, or resistance welding. It does not require preheating before welding, though post-weld annealing may be applied to restore optimal corrosion resistance. The material can also be cut, drilled, and polished to achieve specific dimensions and finishes as per client requirements.
At reputable suppliers, Stainless Steel 321 Sheets, Plates & Coils are supplied with Mill Test Certificates (MTC) confirming compliance with EN 10204 3.1 standards. Each product undergoes stringent quality checks for mechanical strength, dimensional accuracy, and surface finish. Protective coatings and packaging ensure safe transportation and long-lasting quality.
Specification Table
| Specifications | Details |
|---|---|
| Grade | Stainless Steel 321 / 321H |
| UNS Number | S32100 / S32109 |
| WERKSTOFF Nr. | 1.4541 / 1.4878 |
| Standard | ASTM A240 / ASME SA240 |
| Form | Sheet, Plate, Coil |
| Thickness | 0.3 mm to 120 mm |
| Width | 1000 mm, 1219 mm, 1500 mm, 2000 mm or custom cut size |
| Length | 2000 mm, 2440 mm, 3000 mm, 6000 mm or as required |
| Finish | 2B, BA, No.1, No.4, Mirror, Hairline, Matte |
| Density | 8.0 g/cm³ |
| Melting Point | 1398 – 1454 °C |
| Corrosion Resistance | Excellent resistance to intergranular corrosion and oxidation up to 900°C |
| Applications | Chemical processing, heat exchangers, furnace parts, exhaust systems, expansion joints |
Chemical Composition (Typical ranges for SS321)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 2.00 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | 5 × C min, 0.70 max |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Value | Units |
|---|---|---|
| Tensile Strength (Min) | 515 | MPa |
| Yield Strength 0.2% Proof (Min) | 205 | MPa |
| Elongation (Min) | 40 | % |
| Hardness (Brinell Max) | 217 | HB |
| Density | 8.0 | g/cm³ |
| Melting Point | 1398 – 1454 | °C |
| Modulus of Elasticity | 193 | GPa |
| Poisson’s Ratio | 0.29 | – |
| Thermal Conductivity | 16.3 | W/m·K at 100°C |
Equivalent Grades
| STANDARD | STAINLESS STEEL 321 | STAINLESS STEEL 321H |
|---|---|---|
| UNS | S32100 | S32109 |
| WNR | 1.4541 | 1.4878 |
| AFNOR | Z6CNT18-10 | Z6CNT18-12 |
| EN | X6CrNiTi18-10 | X12CrNiTi18-9 |
| BS | 321S31 | 321S51 |
| JIS | SUS 321 | SUS 321H |
| GOST | 08Х18Н10Т | 12Х18Н10Т |
| DIN | X6CrNiTi18-10 | X12CrNiTi18-9 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Thickness (mm) | Size (mm) | Weight (kg/m²) | Weight per Sheet (kg) – 1250mm × 2500mm | Weight per Sheet (kg) – 1500mm × 3000mm |
|---|---|---|---|---|
| 0.5 | 1250 × 2500 / 1500 × 3000 | 4.00 | 12.50 | 18.00 |
| 0.8 | 1250 × 2500 / 1500 × 3000 | 6.40 | 20.00 | 28.80 |
| 1.0 | 1250 × 2500 / 1500 × 3000 | 8.00 | 25.00 | 36.00 |
| 1.5 | 1250 × 2500 / 1500 × 3000 | 12.00 | 37.50 | 54.00 |
| 2.0 | 1250 × 2500 / 1500 × 3000 | 16.00 | 50.00 | 72.00 |
| 3.0 | 1250 × 2500 / 1500 × 3000 | 24.00 | 75.00 | 108.00 |
| 4.0 | 1250 × 2500 / 1500 × 3000 | 32.00 | 100.00 | 144.00 |
| 5.0 | 1250 × 2500 / 1500 × 3000 | 40.00 | 125.00 | 180.00 |
| 6.0 | 1250 × 2500 / 1500 × 3000 | 48.00 | 150.00 | 216.00 |
| 8.0 | 1250 × 2500 / 1500 × 3000 | 64.00 | 200.00 | 288.00 |
| 10.0 | 1250 × 2500 / 1500 × 3000 | 80.00 | 250.00 | 360.00 |
Common Types Of Sheet Plates
Shim Sheet Plate
Perforated Sheet Plate
Chequered Plate
Coil
Strips
Foil
Hot Rolled Sheet Plates
Cold Rolled Plate
Matt PVC Sheet Plate
Frequently Asked Questions (FAQ)
What is Stainless Steel 321?
Stainless Steel 321 is a titanium-stabilized austenitic stainless steel that offers excellent resistance to intergranular corrosion after exposure to high temperatures. It is ideal for applications involving continuous and intermittent heating up to 900°C.
What are the main differences between SS 321 and SS 304?
The primary difference is the addition of titanium in SS 321, which improves resistance to carbide precipitation and enhances performance at high temperatures. SS 321 is preferred for heat-resistant environments, while SS 304 is suited for general corrosion resistance.
What are the available forms of Stainless Steel 321?
Stainless Steel 321 is available in the form of sheets, plates, and coils. These can be supplied in various finishes such as 2B, BA, No.4, and mirror polish, and in custom-cut dimensions as per customer requirements.
What standards apply to Stainless Steel 321 Sheet, Plate & Coil?
SS 321 materials conform to ASTM A240 and ASME SA240 standards. The equivalent international standards include EN 1.4541, UNS S32100, and JIS SUS 321.
What are the key applications of Stainless Steel 321?
SS 321 is used in chemical processing, heat exchangers, exhaust manifolds, expansion joints, furnace parts, and aerospace applications due to its stability and heat resistance.
Sheet Plates & Coils Supplier
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