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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

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Disclaimer
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.