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BS S155 Aerospace Steel BarBS S155

Through Hardenable Steel

BS S155 in the British Standard Aerospace Series is a Nickel-Silicon–Chromium–Molybdenum–Vanadium through hardening steel with a tensile strength of 1,900-2,100 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 hardening followed by oil quenching and tempering followed by air cooling.

Key Features:

BS S155 aerospace steel bar is supplied in black bar for machining and in forgings. The alloy is normally subjected to ultrasonic inspection before supply. It is used widely in high technology applications such as aerospace and motorsport.

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 S155 Aerospace Steel Bar Datasheet

Typical Applications:

  • Aircraft engineering components
  • High performance components for autosport

We offer BS S155 aerospace steel in bar and forgings.


Our processing department within the Smith's Group utilises thirty power saws including fully automated magazine feed CNC rod blanking lines. We can economically cut your material regardless of the volume required.

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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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