4140 steel chemical composition sheets, Grade Guide: AISI 4140 Steel | Metal Supermarkets Steel 0183;32;Mechanical Properties of 4140 Steel. AISI 4140 is a low alloy steel. Low alloy steels rely on elements other than just iron and carbon to enhance their mechanical properties. In AISI 4140, additions of chromium, molybdenum, and manganese are used to increase the strength and hardenability of the steel.
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