Alloy Grade UNS: CF8M Stainless Steel  Alloy

  • Overview

    CF8M / 316 stainless steel is a modification of 304 stainless steel with the addition of 2.0% to 3.0% molybdenum to provide improved resistance to reducing corrosives and pitting attack by chlorides as found in seawater. Careful balance of the chemical composition strengthens this alloy to levels well above most specifications. This alloy has good machinability and weldability but requires re-annealing after welding to restore maximum corrosion resistance.

  • Typical Uses

    Bearings, chemical and food processing, furnace fixtures, heat exchangers, piping, pressure vessels, pulp/paper components, pump and valve components, nuclear flow control, sink rolls, and marine components.

  • MetalTek Grade

    MTEK 316

Similar Specifications

Cast UNS: J92900

Wrought UNS: S31600

Wrought Grade: 316

Cast Grade: CF8M

Cast ASTM: A351, A743, A744

Military/AMS: AMS 5361

* AMS specifying centrifugal casting.

Typical Chemical Composition (% by wt.)

Aluminum: n/a

Carbon: 0.08

Chromium: 18-21

Manganese: 1.5

Iron: n/a

Copper: n/a

Nickel: 9.0-12.0

Lead: n/a

Tin: n/a

Silicon: 1.5

Zinc: n/a

Other: Mo 2-3

Minimum Mechanical Properties

Tensile, ksi

0

Tensile, MPa

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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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.