SS347
SS347 is a niobium-stabilized austenitic stainless steel related to SS304. Niobium stabilizes carbon, improving resistance to intergranular corrosion after welding or exposure in the sensitization temperature range.
SS347 Grade Information
SS347 is a niobium-stabilized austenitic stainless steel related to SS304. Niobium stabilizes carbon, improving resistance to intergranular corrosion after welding or 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 | 347S31 (comparison) / S34700 |
| Product / supply condition | Historical flat-product requirements; check the original contract. |
SS347 Chemical Composition
Manufacturer typical composition, mass %; selected elements only.
| Element / description | Mass % / reference value |
|---|---|
| C | 0.05 |
| Cr | 17.5 |
| Ni | 9.5 |
| Mo | — |
| Other | Nb stabilized |
SS347 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 | 595 | 260 | 45 | 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
347S31 (comparison) / S34700
| 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| Publication status | Withdrawn — 15 July 1999 |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 SS347 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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