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Aircraft Stainless Steel BS S144 / 3S144 (FV 520)
Technical Data Sheet
S144 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 and Primary Hardened, designated S144D, or Solution Treated, Primary Hardened and Precipitated, designated S144H. The heat treatment is as follows:
Solution Treatment : 1000-1050°C plus air cool
Precipitation Harden: 750-850 °C / 2hrs plus air cool (S144D)
Precipitation : 440-460 °C / 2hrs plus air cool (S144H)
| Chemical Composition Limits | |||||||||
| Weight% | C | Si | Mn | P + S max | Cr | Cu | Mo | Nb | Ni |
| S144 | 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 |
| S144 | Primary Hardened S144D | - | - | - | 341 max | - |
| S144 | Sol Trd, Primary Hd, plus Precipitate S144H | 1130-1330 | 1030 | 12 | 352-401 | - |
Availability
Alloy S144D is available in Bars and Forgings. For all stock availability contact Sales.
Specifications
BS S143
BS S145
FV520B
Def Stan 95-14
