Alloy Grade UNS: C12A – Martensitic Stainless Steel 

  • Overview

    Alloy Grade UNS C12A, also known as J84090 steel, is a martensitic stainless steel containing up to 9.5% chromium. It offers good corrosion resistance and performs well in high-temperature environments. This combination of strength and durability makes C12A a versatile choice for various industrial applications where heat resistance and protection against corrosion are essential.

  • Typical Uses

    Abrasive environments and cutting tools.

  • MetalTek Grade

    MTEK 221-01 / 223-01

  • Poured At:

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

Similar Specifications

Cast UNS: J84090

Wrought UNS: K91560

Wrought Grade: P91

Cast Grade: C12A

Cast ASTM: A217

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.08-0.12

Chromium: 8.0-9.5

Manganese: 0.30-0.60

Iron: n/a

Copper: n/a

Nickel: 0.4

Lead: n/a

Tin: n/a

Silicon: 0.20-0.50

Zinc: n/a

Other: Mo 0.85-1.05; Nb 0.06 -0.10; N 0.03-0.07; Al 0.04 MAX; V 0.18-0.25

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Normalize And Temper

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.

Explore Other Alloys

Gears

Non-Ferrous

Non-ferrous alloys are, literally, materials that are not iron-based. While others may provide non-ferrous materials of other materials, the MetalTek family of non-ferrous alloys are copper-based. In general, these materials deliver high strength, and excellent wear and corrosion resistance. They are often found in marine applications and also bushing, bearing, and gear environments.
Stainless Steel Parts

Stainless Steel

Stainless steels owe their ability to resist corrosion primarily to the presence of a passive film on their surface. Chromium is chiefly responsible for formation of the passive film. Iron ceases to rust at approximately 12% chromium content and resistance to oxidizing corrosives increases rapidly with chromium content up to approximately 20%.
Petrochemical Fittings

Specialty Alloys

Specialty Alloys comprise a broad group of materials that deliver properties for more demanding applications, use more exotic or expensive materials, or require special processes to manufacture. Where standard materials may not offer desired performance, specialty alloys (including those that are modified further) may be a sensible selection.