AISI 321
Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850 °C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900 °C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
| Element | Content(%) |
|---|---|
| Manganese, Mn | 2.00 |
| Nickel, Ni | 9.00 - 12.00 |
| Chromium, Cr | 17.00 - 19.00 |
| Carbon, C | - |
| Silicon, Si | 0.75 |
| Molybdenum, Mo | - |
| Sulfur, S | 0.030 (max) |
| Phosphorus, P | 0.045 (max) |
| Nitrogen, N | 0.10 |
| Properties | 321 |
|---|---|
| Tensile Strength (MPa) min | 515 |
| Yield Strength 0.2% Proof (MPa) min | 205 |
| Elongation (% in 50 mm) min | 40 |
| Hardness, HRB max | 95 |
| Hardness, HB max | 217 |
Sheets / Plates
| Production Route | Hot Rolled, Cold Rolled |
| Material Standard | AISI, ASTM, ASME, DIN, BS, EN, ISO, JIS, GOST, SAE, IS & Custom Chemistry |
| Size | Width from 100mm to 3000mm ; Length from 500mm to 12000mm |
| Thickness | 0.1mm to 400mm |
| Delivery Condition | As Rolled, Annealed, Quenched and Tempered, Normalized |
| Surface Finish | Plain, Brushed, Cladded |