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Aircraft Stainless Steel BS S143 / 2S143 (FV 520)
Technical Data Sheet
S143 is a British aerospace grade, precipitation hardenable stainless steel which combines high mechanical strength with moderate corrosion resistance. It is widely used for mechanical components in aerospace and defense applications as well as other high-tech mechanical applications. It is chemically identical to BS S144 and BS S145 and is supplied as bright bar in the finally heat treated condition, designated BS S143D. The heat treatment is as follows:
Solution Treatment : 1050°C plus air cool
Precipitation Treatment (1st Stage): 750 °C / 2hrs plus air cool
Precipitation Treatment (Final Stage): 550 °C / 2hrs plus air cool
| Chemical Composition Limits | |||||||||
| Weight% | C | Si | Mn | P + S max | Cr | Cu | Mo | Nb | Ni |
| S143 | 0.07 | 0.6 | 1.0 | P 0.035 S 0.025 | 13.2-14.7 | 1.20-2.0 | 1.20-2.0 | 0.10-0.40 | 5.0-5.80 |
Typical Mechanical Properties
| Grade | Condition | Tensile Strength N/mm² | Yield Strength N/mm² | Elongation (%) | Hardness | Ruling Section |
| S143 | Finally Heat Treated | 930-1080 | 780 | 15 | 277-341 | - |
| S143 | Finally Heat Treated Softened | 930-1080 | 780 | 12 transverse test piece | 277-341 331 max | - |
| S143 | Softened | 331 max | - |
Availability
Alloy S143 is available in Bars and Forgings. For all stock availability contact Sales.
Specifications
BS S144
BS S145
FV520B
Def Stan 95-14
