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ASTM A240 vs A240M – What’s the Difference

We often hear about ASTM A240 and A240M stainless steel sheets in the metal fabrication industry. Professionals widely use these two specifications, and they are essential in ensuring the quality of the products. However, many still need to familiarize themselves with the differences between ASTM A240 and A240M. This blog post will thoroughly explain the variations between these two specifications to help you understand which suits your operations.

What is ASTM A240?

Have you ever wondered what ASTM A240 is all about? Well, for starters, it is a standard specification for chromium and chromium-nickel stainless steel plate, sheet, and strip used for pressure vessels and for general applications. Basically, it sets a benchmark for quality and safety within the industry, ensuring that the materials used in critical applications meet certain requirements. This is crucial in industries such as oil and gas, nuclear power, and chemical processing, where pressure vessels are used to contain volatile substances, and the failure of even a single component can have catastrophic consequences. So next time you come across the term ASTM A240, you can rest assured that it is synonymous with safety and quality.

What is A240M?

A240M is actually a specification that outlines the requirements for the design, materials, and dimensions of stainless steel plate, sheet, and strip used in construction and other industrial applications. Developed by the American Society for Testing and Materials (ASTM), this standard aims to guide manufacturers in producing high-quality stainless steel products that meet certain criteria. So, the next time you come across A240M, know that it’s simply a set of guidelines for ensuring that stainless steel products are up to snuff.

Difference Between ASTM A240 and A240M

  • ASTM A240 is a specification for chromium and chromium-nickel stainless steel plate, sheet, and strip for pressure vessels and general applications.
  • ASTM A240M is a similar specification restricted to pressure vessel applications.
  • The main difference between the two specifications is that ASTM A240 covers both plate and strip products, while ASTM A240M only covers plate products.
  • Both specifications cover a range of grades, from 304 to 439, and each grade has a range of sub-grades with different properties.
  • The most important properties for pressure vessel applications are toughness and corrosion resistance.


In conclusion, ASTM A240 and A240M are widely used specifications in the metal fabrication industry. The major difference is that ASTM A240 is in imperial measurements while ASTM A240M is in metric measurements. Although the physical properties of both standards are comparable, the thickness and their applications differ. Based on these explanations, manufacturers can choose between the specifications to suit their operations and applications. It all comes down to industry preferences, practices, and standards.

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