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.
British aerospace sheet and strip reference for niobium-stabilized stainless steel, associated with Type 347 in DRDO material guidance.
| Material specification | BS S 527 |
|---|---|
| Material identification | S34700 |
| Product / supply condition | Softened; confirm ordered aerospace requirements. |
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 S 527 edition and certified material test results for acceptance. Confirm specimen direction, gauge length, thickness and heat treatment.
BS S 527 Grade Reference
S34700
| Material specification | BS S 527 |
|---|---|
| Source edition | BS S 527:1969+A3:2013 publisher record |
| Product / supply condition | Softened; confirm ordered aerospace requirements. |
| Specification information | The publisher title identifies 540 MPa tensile strength. Check the full standard for thickness-dependent tests and other requirements. The 347 manufacturer reference values below are not the BS S 527 acceptance table. |
| Comparison tables | View the BS S 527 comparison tables |
| Material overview | View SS347 in Materials |
| Source reference | BSI — BS S 527:1969+A3:2013 publisher record |
| Source reference | DRDO — Aviation Metallic Materials, Volume II (347 / BS S 527 mapping) |
| Source reference | Outokumpu — Steel Grades, Properties and Global Standards, Tables 4, 5 and 7 |
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