Hardness of Quench and Tempered alloy steels is a function of the tempering temperature. The higher the tempering temperature, the lower the hardness.
This is called an inverse relationship.
To advance member companies is part of the PMPA’s Mission; “to identify legislative issues having a significant impact on the Precision Machining Industry… to provide information to impact those issues” is part of the PMPA Government Affairs Committee’s Mission. The Small Business Jobs and Credit Act of 2010 signed into law today by President…
Res ipsa loquitor.
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PMPA provided an analysis to OMB and EPA showing that the burden of the proposed “Article Clarification” for TRI 313 Reporting on just the precision machining industry in the US would be of the order of $3.5 million, fabricated metal industry, $66 million, and over $209 million for the entire 33 NAICS code including precision machining, fabricated metal, and machinery manufacture.
When heated below the lower critical temperature, steels will develop a temper color. This chart shows the temper colors obtained in a 0.95% carbon content steel at various temperatures.
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Chromium is added to steel to
Increase resistance to corrosion;
Increase resistance to oxidation;
Increase hardenability;
Improve high temperature strength;
Improve abrasion resistance in higher carbon grades.
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