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Aircraft Stainless Steel BS S143 / 2S143 (FV 520)


Technical Data Sheet

 

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

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

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

Services
At Aircraft Materials all stock items can be shipped out within 24 hours, usually within the same day. Even cutting orders for bar or sheet can be processed and dispatched the same day, and for time-critical situations such as AOGs, we have a dedicated AOG service desk ready to help (aog@aircraftmaterials.com).

Thanks to our global logistics network we can source from anywhere in the world in just a few days. We use a range of transport partners to enable us to ship overnight within the U.K. and Europe and provide fast shipping solutions to the rest of the world. If your requirement is urgent we can offer a priority shipping service, but also if time is not so critical we can offer more cost-effective options to ensure you get the best value for money. To find out more about our services click here.

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.

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