4140 Steel Bar AISI A29 | 1.7225 | 42CrMo4 | SCM440 Otai AISI alloy 4140 steel bar, plate and square can be hardened by cold working, or heating and quenching. SAE 4140 alloy steel is usually supplied ready heat treated to hardness in 1822 HRC. If further heat treatment is required, then heat to 840 oC – 875 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.
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