Stainless Steel - 7S80D - AMS5628

7S80D - AMS5628

BS 7S80 is the British aerospace standard for 431 stainless steel. S80D alloy is a high chromium-nickel corrosion-resistant martensitic stainless steel. It is extremely corrosion resistant and offers very good strength and toughness. BS 7S80 is the British aerospace standard for 431 stainless steel. It is typically used in aerospace and defence applications. The grade is generally supplied in the hardened and tempered condition.

Chemical Composition

Spec: AMS 5628

Chemical Element % Present
Carbon (C) 0.12 - 0.20
Manganese (Mn) 0.0 - 1.00
Silicon (Si) 0.0 - 1.00
Phosphorous (P) 0.0 - 0.03
Sulphur (S) 0.0 - 0.03
Nickel (Ni) 2.00 - 3.00
Chromium (Cr) Balance




Mechanical PropertyValue
Proof Stress 690 MPa
Tensile Strength 880-1080 MPa
Elongation A50 mm 12 %
Hardness Brinell 255-321 HB

Alloy Designations

BS 7S 80D
BS 970 PT3

Supplied Forms

  • Bar
  • Rod


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Last Datasheet Revision

18 July 2019


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.