Alloy Grade / UNS: 440C

  • Overview

    Martensitic stainless steel with good strength and corrosion resistance but excellent hardness and wear resistance. The 440C alloy has higher levels of carbon compared to 440A and 440B.

  • Typical Uses

    Valve components, pump parts, and bearings.

  • MetalTek Grade

    MTEK 440C

Similar Specifications

Cast UNS: J91639

Wrought UNS: S44004

Wrought Grade: 440C

Cast Grade: 440C

Military/AMS: AMS 5352

* AMS specifying investment casting.

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.95-1.20

Chromium: 16-18

Manganese: 1

Iron: BAL

Copper: n/a

Nickel: 0.75 MAX

Lead: n/a

Tin: n/a

Silicon: 1

Zinc: n/a

Other: Mo 0.25-0.75

Minimum Mechanical Properties

Brinell Typical:


Heat Treatment: Anneal

NOTES: Brinell value is MAX.