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Air hardening steel is a type of steel that has deep hardenability and can be hardened in large sections by air cooling. This article discusses the principles of heat treatment of air-hardening steel, and describes the recommended heat treating practices for air-hardening high-strength structural steels, namely, H11 Mod, H13 steel, 300M steel, D-6A and D-6AC, and AF1410 steel. It also provides information on recommended heat treating practices for air-hardening martensitic stainless steels.

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Aidang Shan, Liming Fu, 2014. "Heat Treating of Air-Hardening High-Strength Structural Steels", Heat Treating of Irons and Steels, Jon L. Dossett, George E. Totten

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