Alloy Grade – UNS: 440A – Martensitic stainless Steel

  • Overview

    440A is a martensitic stainless steel with good strength and hardness but excellent corrosion resistance and wear resistance. The boosted corrosion and hardness comes from hardening and tempering. Martensitic stainless steel is known for its strength, corrosion resistance, and durability, making it suitable for various applications in industries like medical, aerospace, and manufacturing. Comprising primarily chromium (11.5-18%) and carbon (up to 1.2%), this steel can be hardened through heat treatments, enhancing its mechanical properties.

  • Typical Uses

    Valve components, pump parts, and bearings.

  • MetalTek Designation

    MTEK 440A

  • Poured At:

    Carondelet Division, Sandusky International Division, Wisconsin Centrifugal Division, Wisconsin Investcast Division

Similar Specifications

Wrought UNS: S44002

Wrought Grade: 440A

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.60-0.75

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:

0

Calculated PREn (Minimum)

0

Heat Treatment: Anneal

NOTES: Brinell value is MAX.

Frequently Asked Questions

Martensitic steel is a magnetic stainless steel that is heat-treatable and used for applications requiring high hardness.

Martensitic steel is used in chemical and food processing equipment, impellers, turbine engine components, and wear-resistant parts where hardness and strength are critical.

Austenitic steel is non-magnetic, corrosion-resistant, and ductile. Martensitic steel is magnetic, harder, heat-treatable, and more wear-resistant but less corrosion-resistant.

Martensitic steel offers high hardness, wear resistance, and strength after heat treatment, ideal for demanding mechanical applications.

Yes, martensitic steel can be heat treated through quenching and tempering to increase hardness and mechanical performance.

Yes, martensitic stainless steel is magnetic due to its body-centered tetragonal (BCT) structure after quenching.

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