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 -

Alloy S144D is available in Bars and Forgings. For all stock availability contact Sales.


BS S143
BS S145
Def Stan 95-14

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Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.