SS321
SS321 is a titanium-stabilized austenitic stainless steel based on the 18-8 Cr-Ni family. Titanium ties up carbon as stable carbides, improving resistance to intergranular corrosion after exposure in the sensitization temperature range.
SS321 Grade Information
SS321 is a titanium-stabilized austenitic stainless steel based on the 18-8 Cr-Ni family. Titanium ties up carbon as stable carbides, improving resistance to intergranular corrosion after exposure in the sensitization temperature range.
Legacy British standard for stainless and heat-resisting steel plate, sheet and strip. Manufacturer BS/UK grade comparisons are provided for interpreting older material descriptions.
| Material specification | BS 1449-2 |
|---|---|
| Material identification | 321S31 (comparison) / S32100 |
| Product / supply condition | Historical flat-product requirements; check the original contract. |
SS321 Chemical Composition
Manufacturer typical composition, mass %; selected elements only.
| Element / description | Mass % / reference value |
|---|---|
| C | 0.04 |
| Cr | 17.3 |
| Ni | 9.1 |
| Mo | — |
| Other | Ti stabilized |
SS321 Mechanical Properties
Published reference values for the stated form and condition. Typical values are not specification acceptance limits.
| Product form / condition | Tensile (MPa) | 0.2% proof / yield (MPa) | Elongation (%) | Data basis |
|---|---|---|---|---|
| Hot-rolled plate, usually 10–20 mm, transverse; room temperature | 570 | 250 | 55 | Manufacturer typical values; elongation A5. |
Manufacturer reference data is shown for comparison. Use the selected BS 1449-2 edition and certified material test results for acceptance. Confirm specimen direction, gauge length, thickness and heat treatment.
BS 1449-2 Grade Reference
321S31 (comparison) / S32100
| Material specification | BS 1449-2 |
|---|---|
| Source edition | BS 1449-2:1983 |
| Publication status | Withdrawn — 15 July 1999 |
| Product / supply condition | Historical flat-product requirements; check the original contract. |
| Specification information | The BS/UK designations are manufacturer cross-references, not a declaration that the corresponding UNS grade satisfies every clause of BS 1449-2. For new stainless flat-product enquiries review the BS EN 10088-2 route. |
| Comparison tables | View the BS 1449-2 comparison tables |
| Material overview | View SS321 in Materials |
| Source reference | BSI — BS 1449-2:1983 publisher record and withdrawal status |
| Source reference | Outokumpu — Steel Grades, Properties and Global Standards, Tables 4, 5 and 7 |
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