Alloy Grade UNS: CD3MN, 4A – Seawater Corrosion Resistance

  • Overview

    CD3MN, also known as 4A or J92205, is a duplex stainless steel that stands out for its exceptional corrosion resistance, particularly in seawater environments. This alloy offers a remarkable combination of strength and corrosion resistance, boasting nearly twice the strength of common stainless steels while effectively resisting chloride-induced stress corrosion cracking and pitting corrosion. Its balanced microstructure, composed of roughly equal parts austenite and ferrite, contributes to its impressive mechanical properties and corrosion resistance. This makes CD3MN a popular choice for demanding applications in marine environments, chemical processing, and other industries where components are exposed to harsh corrosive conditions.

  • Typical Uses

    Centrifuge and dewatering equipment, couplings, heat exchangers, offshore piping systems, paper rolls, pulp digesters, pump and valve components, pressure vessels.

  • MetalTek Grade

    MTEK 2205

  • Poured At:

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

Similar Specifications

Cast UNS: J92205

Wrought UNS: S31803

Wrought Grade: 2205

Cast Grade: CD3MN, 4A

Cast ASTM: A890, A995

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.03

Chromium: 21.0-23.5

Manganese: 1.5

Iron: n/a

Copper: 1.0 MAX

Nickel: 4.5-6.5

Lead: n/a

Tin: n/a

Silicon: 1

Zinc: n/a

Other: Mo 2.5-3.5; N 0.10-0.30

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

0

Calculated PREn (Minimum)

0

Yield, ksi

0

Yield, MPa

0

Elongation

0%

Heat Treatment: Solution Anneal

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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.
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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%.
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