440B Steel Profile

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440B is a stainless steel you may encounter when researching an older knife or comparing blade specifications. The letter matters: 440A, 440B and 440C are separate grades, and a blade marked only “440” does not tell you which one you have.

What Is 440B?

440B is a high-carbon chromium stainless grade used for cutlery and other hardened parts. Carpenter’s datasheet provides one documented specification, not proof that Carpenter produced every 440B blade. Its carbon range differs from the neighboring 440 grades, but that alone does not establish an overall quality ranking.

What Matters for Cutting Performance?

A steel designation cannot tell you whether a particular knife has a thin slicing edge or a heavier grind. Look at the maker’s intended use and heat treatment before predicting how it will cut.

Care and Sharpening

Clean away food or salt residue and dry the knife after use. Stainless steel still needs care, especially around joints and handle fittings. For sharpening, maintain a consistent bevel and use a coarser abrasive when there is damage to repair rather than trying to remove it with a fine polishing stone.

Choosing a Knife in 440B

Confirm the full grade designation if the listing is vague. With an older knife, condition and previous sharpening can matter as much as the original specification. A well-maintained edge and a useful blade shape are better reasons to choose it than the assumption that any 440-series steel is automatically good or bad. Our knife steel guide explains the broader choices.