Applications of 321 and 321H grade stainless steel plates
Applications of 321 and 321H grade stainless steel plates
321 and 321H stainless steels are titanium-stabilized austenitic grades used for high-temperature service (up to ~900°C), offering excellent resistance to oxidation and intergranular corrosion after welding, with 321H having higher carbon for better creep strength. Key applications include aerospace (manifolds, exhaust systems), chemical/petrochemical plants (piping, tanks, heat exchangers, furnaces), and thermal processing (furnace parts, boiler tubes, expansion joints, stack liners).
What are the properties of 321H stainless steel?
General Properties
321H stainless steel exhibits excellent resistance to intergranular corrosion within the chromium carbide precipitation temperature range of 800–1500°F (427–816°C). This alloy remains resistant to oxidation at 1500°F (816°C), and its creep and stress fracture properties are superior to those of 304 and 304L alloys.
Stainless Steel 321/321H Sheets Specification
Standard ASTM A240 / ASME SA240, JIS4304-2005, ASTM A167, EN10088-2-2005, GB/T3280-2007, etc
Range 0.5 mm To 150 mm thick in 1000 mm TO 2000 mm width & 2500 mm to 6000 mm Length available with NACE MR 01-75.
Surface Finishing Hot rolled plate (HR), Cold rolled sheet (CR),2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, 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.
SUS 321/321H Steel Sheet Equivalent Indian Standard
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Stainless Steel 321/321H Plates Chemical Composition
| 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 |
SS 321/321H Sheets Mechanical Properties
| 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 % |
Application of SS 321 / 321H sheet materials
Offshore drilling
Oil and gas
Oil refinery
Nuclear power
Cement
Power plant
Fertilizer plant
Brewery
Chemicals
Petrochemicals
Shipbuilding
Mining
Steel mill
Construction
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321 Stainless Steel Sheet
Applications: 321 stainless steel sheet is widely used in high-temperature and corrosive environments. Common applications include aircraft exhaust systems, heat exchangers, chemical equipment, and expansion joints. Its good formability and oxidation resistance make it ideal for a variety of industrial applications.
321H Stainless Steel Sheet
Applications: 321H stainless steel sheet is the preferred material for applications requiring higher high-temperature strength and sensitization resistance. It is commonly used in heat treatment equipment, industrial furnaces, boiler components, and automotive exhaust systems. Its higher carbon content gives it greater structural integrity under high-stress conditions.
Gnee Steel also supplies custom stainless steel 321 products in various sizes and specifications. Please send us your drawings for a quote!