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Aircraft Stainless Steel BS S145 / 3S145 (FV 520)
Technical Data Sheet
S145 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 S143 and BS S145 and is supplied as bright bar, usually in one of two heat treatments: Solution Treated, designated S145D, or Solution Treatedand Precipitated, designated S145H. The heat treatment is as follows:
Solution Treatment : 850-950°C/1hr plus air cool (S145D)
Precipitation: 440-460°C / 30mins plus air cool (S145D)
| Chemical Composition Limits | |||||||||
| Weight% | C | Si | Mn | P + S max | Cr | Cu | Mo | Nb | Ni |
| S145 | 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 (HB) | Ruling Section |
| S145D | Solution Treated S145D | - | - | - | 363 max | - |
| S145H | Solution Treated & Precipitated S145H | 1270-1470 | 1030 | 15 | 352-401 | <75mm |
| S145H | Solution Treated & Precipitated S145H | 1270-1470 | 1030 | 10 | 352-401 | >75mm |
Availability
Alloy S145 is available in Bars and Forgings. For all stock availability contact Sales.
Specifications
BS S143
BS S144
FV520B
Def Stan 95-14
