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Aditya Stainless, a reputable manufacturer and supplier based in Kolkata, India, specializes in high-performance Stainless Steel 321 and 321H Sheets and Plates. These materials are celebrated for their outstanding resistance to intergranular corrosion and impressive strength at high temperatures. SS 321 is a titanium-stabilized austenitic stainless steel, while SS 321H is a high-carbon variant that offers improved creep resistance and greater mechanical strength when exposed to elevated temperatures. Produced in accordance with ASTM A240 and ASME SA240 standards, these sheets and plates come in various thicknesses and finishes, making them perfect for industries such as aerospace, chemical processing, thermal processing, and power generation.
Stainless Steel 321/321H Sheets and Plates are composed of 17–19% chromium, 9–12% nickel, and are stabilized with titanium (which is at least five times the carbon content). The 321H variant features a higher carbon content (0.04–0.10%) to boost its high-temperature strength. These plates demonstrate a minimum tensile strength of 515 MPa, a yield strength of 205 MPa, and an elongation of 35%. The addition of titanium helps prevent carbide precipitation during welding, allowing them to be used at temperatures up to 900°C. These characteristics ensure exceptional performance in oxidizing environments and during thermal cycling.
Specifications: ASTM A240 / ASME SA240
Dimensions: ASTM, ASME, and API.
Width: 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc
Thickness:4mm-100mm
Length : 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc
Surface Finish: 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, chequered, embossed, hairline, sand blast, Brush, etching, Hot rolled plate (HR), Cold rolled sheet (CR), SATIN (Met with Plastic Coated) etc
Form: Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc.
| Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
| SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
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These sheets contain high corrosion resistance and are available up to 1.2-12mm thickness and width up to 2000mm. They are ideal for high temperature application.
Cold rolled plates of SS 321H possess higher corrosion resistance and are available up to 0.3-6mm in thickness and up to 1500mm in width. They are perfect for applications requiring a smooth finish and high strength.
These plates provide outstanding resistance to corrosion, and come in thickness from 3mm up to 12mm and have sizes of up to 1500mm x 3000mm. Raised pattern surface increases the gripping value, thus commonly used for floor and structural work.
Perforated sheets are extremely resistant to corrosion and can be perforated from 0.5mm up to 20mm in diameter. The sheet thickness is also from 0.3mm up to 3mm. It is used in filtration and ventilation systems.
Shim sheets are resistant to corrosion with a high accuracy level. Thickness is available between 0.05mm up to 3mm, and cut-to-size service is also possible to get precise dimensions for several alignment and spacing applications.
Polished plates have excellent resistance to corrosion, and a reflective finish. These plates are manufactured in thickness range from 3mm to 50mm. The size for these plates up to 2000mm x 6000mm is ideal for aesthetic applications as well as a high-quality surface finish.
Aditya Stainless offers an excellent customer experience along with detailed documentation of its high-quality Stainless Steel 321/321H Sheets and Plates. We deliver key documents such as the commercial invoice, packing list, fumigation certificate, heat treatment chart, quality assurance plan, and NABL-approved lab test report, making it easier to validate the authenticity and superior quality of our products for the value-added customers. Our Stainless Steel 321/321H Sheets and Plates, meanwhile, possess diversified test certificate features, ranging from MTC accordance with EN10204 /3.1B to a PMI test Certificate, radiographic test reports having 100 % and even up to third Party Inspection. Here, too the certificates explain their customer-driven activities and unwearied product quest for superior product quality.
Stainless Steel 321/321H Sheets and Plates are perfect for high-temperature applications and welding tasks, such as in heat exchangers, boilers, exhaust systems, furnace components, and aerospace engine parts. Their resistance to intergranular corrosion post-welding makes them ideal for chemical processing equipment, thermal oxidizers, and refinery systems. SS 321H, with its elevated carbon content, is particularly suited for situations where enhanced creep strength and stress rupture resistance are crucial. Both grades are widely used across the automotive, marine, and oil & gas industries, guaranteeing reliable performance in demanding conditions.
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