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Material identification





2003

A very simple question, can some one please explain with regard to Stainless steel what the "M" of the formulae CF8M relates too?

Kind regard,

Eric Barraclough
valves - Auckland, Penrose, New Zealand



First of two simultaneous responses -- 2003

It denotes the presence of molybdenum as a significant alloying element. The "M" doesn't specify a particular percentage, and the actual percentage varies from alloy to alloy (in CF8M it is 2.0 to 3.0 percent).

Bill Reynolds
Bill Reynolds [deceased]
consultant metallurgist - Ballarat, Victoria, Australia
We sadly relate the news that Bill passed away on Jan. 29, 2010.




Second of two simultaneous responses -- 2003

I am not sure about that particular code without researching, but I know in the ASTM code that the 'M' means that it was heat treated twice.

Jeremy Kuhn
- Lancaster, Pennsylvania, USA


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