400 Series Martensitic - Alloys: 403, 410, 414, 416, 420, 422, 431, 440

Straight chromium alloy, magnetic, but can be hardened by heat treatment.

 

The 400 series group of stainless steels has an 11 percent chromium and 1-percent manganese increase, above the 300 series group. The 400 series is susceptible to rust and corrosion under some conditions. Heat-treating will harden the 400 series. The 400 series of stainless steels have higher carbon content, giving it a martensitic crystalline structure. This provides high strength and high wear resistance. Martensitic stainless steels aren’t as corrosion resistant as the austenitic types.

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