About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.


Stainless Steel

440B Stainless Steel

With performance behaviour similar to tool E297 steel, Alloy 440B offers excellent hardness after heat treatment.

Martensitic Stainless Steel

It is a high carbon, martensitic stainless steel product with good overall strength and moderate corrosion resistance in the hardened and tempered condition. The alloy must be free of scale and foreign particles if optimum corrosion resistance is to be achieved. 440B annealed product also offers similar machining characteristics when compared with high speed annealed steel grades. With such excellent hardness, the alloy also promotes good wear resistance. A hardness value of 60 HRC is achievable after heat treatment.


The product is not recommended for use in temperatures above the respective tempering temperature as mechanical properties would be reduced. The manufacturing specification for Alloy 440B is ASTM A276. Product applications include ball bearings, valves and measuring equipment.

Typical Applications

Commercial applications for this engineering material include:

  • Valve seats
  • Cutting tools and knife blades
  • Bearings
  • Surgical instruments

We stock 440B in round bar, plate and sheet.

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.

Additional Info

A technical datasheet for 440B is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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