Alloy Grade UNS: 440B – Martensitic stainless steel 

  • Overview

    The 440B alloy is a martensitic stainless steel with good strength and hardness but excellent corrosion resistance and wear resistance.

  • Typical Uses

    Valve components, pump parts, and bearings.

  • MetalTek Grade

    MTEK 440B

Similar Specifications

Wrought UNS: S44003

Wrought Grade: 440B

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.75-0.95

Chromium: 16-18

Manganese: 1

Iron: BAL

Copper: n/a

Nickel: n/a

Lead: n/a

Tin: n/a

Silicon: 1

Zinc: n/a

Other: Mo 0.75

Minimum Mechanical Properties

Brinell Typical:


Heat Treatment: Anneal

NOTES: Brinell value is MAX.