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Aircraft Steel BS S535

Technical Data Sheet

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

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

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

Availability
Alloy S535 for all stock availability contact Sales.

Specifications
AISI 4130
AMS 6370-4130 Sheet/ Strip/Plate
WS 1.7214
25CD45

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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.