Alloy Grade UNS: M-25S Acid and Alkaline Resistant

  • Overview

    M-25S is a specialized alloy specifically formulated for exceptional resistance to both acidic and alkaline environments. This weldable grade offers excellent corrosion resistance across a wide pH range, making it suitable for challenging applications where components are exposed to harsh chemicals and corrosive solutions. Its ability to withstand both acidic and alkaline conditions makes it a valuable choice for industries such as chemical processing, wastewater treatment, and other applications where corrosion resistance in varying pH environments is critical.

  • Typical Uses

    Filter parts, pump and valve components, seal housings.

  • MetalTek Designation

    MTEK D

  • Poured At:

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

Similar Specifications

Cast UNS: N04019

Cast Grade: M-25S

Cast ASTM: A494

Military/AMS: QQ-N-288 Comp D

Typical Chemical Composition (% by wt.)

Aluminum: 0.50 MAX

Carbon: 0.25

Chromium: n/a

Manganese: 1.50

Iron: 3.5 MAX

Copper: 27-33

Nickel: 60 MIN

Lead: n/a

Tin: n/a

Silicon: 3.5-4.5

Zinc: n/a

Minimum Mechanical Properties

Brinell Typical:

0

Heat Treatment: Not Heat Treated

NOTES: Brinell value is MIN.

Frequently Asked Questions

Nickel-copper alloys offer excellent resistance to seawater, acids, and alkalis while maintaining strength and ductility.

Used in marine valves, pumps, heat exchangers, desalination systems, and chemical processing components requiring corrosion resistance.

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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 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.