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"Meaning of C"



2004

What does the C stand for in 440C Steel?

Alyn Brown
student - Columbia, MO, US
^


2004

The C indicates that this is a different alloy (UNS designation S44004) from Type 440A (UNS S44002) and Type 440B (UNS S44003). These alloys have essentially the same alloying elements, but the carbon content differs. 440A specifies C = 0.60 to 0.75% (by mass), 440B specifies C = 0.75 to 0.95%, and 440C specifies C = 0.95 to 1.2%. For more information, check out ASM Handbook Volume 1 or one of the producers websites like Carpenter.

Toby Padfield
Automotive module supplier - Michigan
^

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