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- Jan 20, 2018
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Agree with @ericc, if the material you have is equivalent to 4140, it is an oil-hardening steel with a maximum hardness of about Rc 48-50. Pre-hardened 4140 will be Rc 28-32.
"Heat Treatment
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating it at 913°C (1675°F) for a long period of time, followed by air cooling."
"Heat Treatment
AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating it at 913°C (1675°F) for a long period of time, followed by air cooling."
AISI 4140 Alloy Steel (UNS G41400)
Alloy steels are designated by AISI four-digit numbers. They comprise different kinds of steels having composition exceeding the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va set for carbon steels.
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