Alloy Grade UNS: CN7MS – Super Austenitic Alloy 

  • Overview

    CN7MS, also known as Alloy 20 or J94650, is a super austenitic stainless steel that builds upon the excellent corrosion resistance of CN7M. This modified alloy offers even greater resistance to sulfuric acid and other aggressive chemicals, making it a preferred choice for demanding applications in chemical processing, pharmaceuticals, and food processing. CN7MS retains the beneficial non-magnetic properties of CN7M while providing enhanced mechanical properties, including high strength and ductility. This combination of superior corrosion resistance, good mechanical properties, and non-magnetic characteristics makes CN7MS a valuable choice for industries where material performance and resistance to harsh chemicals are critical.

  • Typical Uses

    Food and beverage equipment, waste treatment and handling, and pharmaceutical applications.

  • MetalTek Grade

    MTEK 20M

  • Poured At:

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

Similar Specifications

Cast UNS: J94650

Cast Grade: CN7MS

Cast ASTM: A744

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.07

Chromium: 18-20

Manganese: 1

Iron: n/a

Copper: 1.5-2.0

Nickel: 22-25

Lead: n/a

Tin: n/a

Silicon: 2.5-3.5

Zinc: n/a

Other: Mo 2.5-3.0

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

Frequently Asked Questions

Super austenitic steel is a high-alloy stainless steel with enhanced levels of chromium, molybdenum, and nitrogen, providing superior resistance to chloride-induced corrosion.

Used in desalination plants, offshore platforms, chemical processing, marine equipment, and pulp & paper industries where high chloride or acidic environments are present.

Super austenitic steels offer higher molybdenum and nitrogen levels than standard austenitic steels, improving their resistance to pitting, crevice, and stress corrosion.

Benefits include exceptional resistance to aggressive environments, high strength, extended life in chloride-rich applications, and suitability for welding and fabrication.

Its high levels of molybdenum, chromium, and nitrogen promote the formation of a passive oxide layer that protects against localized and general corrosion.

Grades such as 254SMO and AL-6XN are considered super austenitic stainless steels, offering premium corrosion resistance in extreme environments.

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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.
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%.
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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.