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BS S156 Aerospace Steel BarBS S156

Case Hardening Steel

BS S156 in the British Standard Aerospace Series is a 4% Ni-Cr-Mo case-hardening steel with a tensile strength of 1,320-1,520 MPa.

The material is manufactured by consumable electrode vacuum arc remelting (VAR). Bars, and where practicable, forgings, are subjected to ultrasonic examination. Bars and forgings are supplied in the normalised and softened condition. Parts produced from bar and forgings are required to be supplied in the finally heat treated condition which consists of carburising, hardening and tempering.

Key Features:

BS S156 aerospace steel bar is supplied in black bar, bright bar and forgings. The supply condition of the alloy is normalised and softened. In fabrication, parts produced will need to be supplied in the heat treated condition - this consists of carburising, hardening and tempuring.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Download BS S156 Aerospace Steel Bar Datasheet

Typical Applications:

  • Aircraft engineering components
  • High performance components for autosport

We offer BS S156 aerospace steel in bar and forgings.


With more than thirty power saws within the Smiths group including a fully automated magazine feed CNC rod blanking line, we can process your material to your precise requirements. We can also economically cut from one off blanks to the largest production run for immediate or just in time deliveries.

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To find out more about Smiths Metal Centres extensive range of high quality aerospace steel bars, click on one of our products on the side menu of this web page.

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