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Aircraft Stainless Steel BS S80 (MSRR 6573 / AMS 5628/ 431S29)
Technical Data Sheet
BS 7S80 is the British aerospace standard for 431 stainless steel. Designed to combine good corrosion resistance and high mechanical properties after heat treatment, it is used widely used in aerospace and defence applications. The grade is generally supplied in the hardened and tempered condition, designation S80D.
| Chemical Composition Limits | |||||||
| Weight% | C | Si | Mn | P+S max | Cr | Ni | Others (max) |
| 4-S80 5-S80 6-S80 7- S80 Bar | 0.12-0.20 | 1.00 max | 1.00 max | P 0.030 S 0.025 | 15-18 | 2-3 | Mo 0.3 / Co 0.05 / Cu 0.3/ Nb 0.05 / Sn 0.02 / Ti 0.05 / V 0.20 / W 0.05 |
| Chemically similar British Specifications BS.970 Pt4 431 S29 (EN57) | |||||||
| Weight% | C | Si | Mn | P+S max | Cr | Ni | Others (max) |
| 431S29 (EN57) | 0.12-0.20 | 0.80 max | 1.00 max | P 0.040 S 0.030 | 15-18 | 2-3 | - |
| Other Chemically similar Specifications | |||||||
| Weight% | C | Si | Mn | P+S max | Cr | Ni | Others (max) |
| AISI 431 SAE - 51431 | 0.20 max | 1.00 max | 1.00 max | P 0.040 S 0.030 | 15-17 | 1.25-2.5 | - |
| AMS 5628D | 0.12-0.17 | 0.20-0.60 | 0.30-0.80 | P 0.040 S 0.030 | 15.50-17 | 2-3 | Mo 0.50 / Cu 0.50 / N 0.10 |
| MIL-S-86213 431 | 0.20 max | 1.00 max | 1.25 max | P 0.040 S 0.030 | 15-17 | 1.25-2.5 | - |
| MIL-S-8967 (ASG) | 0.13-0.17 | 0.20-0.60 | 0.30-0.80 | 0.025 | 15.50-16.50 | 2-3 | Mo 0.25 |
| MIL-S-187320 | 0.13-0.17 | 0.20-0.60 | 0.30-0.80 | P 0.040 S 0.030 | 15.50-16.50 | 2-3 | Mo 0.25 / N 0.10 |
| MSRR 6573 | - | - | - | - | - | - | - |
| Z15 CN17-03 | - | - | - | - | - | - | - |
| BACM 85 | - | - | - | - | - | - | - |
| WS 1.4044 | - | - | - | - | - | - | - |
| WS 1.4057 XX22CrNi17 | 0.15-0.23 | 1.00 max | 1.00 max | P 0.045 S 0.030 | 16-18 | 1.50-2.50 | - |
| UNI X16CrNi16 | 0.10-0.20 | 1.00 max | 1.00 max | P 0.040 S 0.030 | 15-17 | 1.50-2.5 | - |
Typical Mechanical Properties
| Grade | Treatment | Tensile Strength Rm N/mm² | Proof Stress Rp 0.2, N/mm² | Elongation A% √5.65 % | IZOD Impact FT/ Lbs | Hardness HB | Ruling Section | Product Range | Colour Code |
| 6S80 | HT | 880/1080 | 690 | 12 | 25 | 255-321 | 2.5" | Round Square Flat Hexagon | Brown Black Red |
Availability
Alloy S80 (431S29) is available in Bar and Rod. For all stock availability contact Sales.
