Aircraft Steel BS S535

Technical Data Sheet


Chemical Composition Limits
Weight% C Si Mn P + S max Cr Mo Ni
S535 0.22-0.29 0.15-0.35 0.50-0.80 P 0.02
S 0.025
0.90-1.20 0.15-0.25 0.3

BS S535 is an alloy steel, similar to U.S. specification 4130 (AMS 6350). It is supplied in sheet form in the softened condition, usually dual certified to BS S534 for subsequent heat treatment, depending on the properties required. Heat treatment is as follows:

S534 Harden 870°C + Oil quench / Temper 540°C (2hrs) + air cool
S535 Harden 870°C + Oil quench / Temper 420°C (2hrs) + air cool

Typical Mechanical Properties

Grade Condition Tensile Strength N/mm² Yield Strength N/mm² Elongation (%) Hardness (HB) Ruling Section
S535 Hardened & Tempered 1150-1300 1000 4 341-388 <1.5mm
S535 Hardened & Tempered 1150-1300 1000 5   1.5mm - 3.0mm
S535 Hardened & Tempered 1150-1300 1000 6   >3.0mm
S535 Softened       174 max  

Alloy S535 for all stock availability contact Sales.

AISI 4130
AMS 6370-4130 Sheet/ Strip/Plate
WS 1.7214


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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.