This chapter discusses the evolution of engineering alloy steels, namely chromium, nickel, and nickel-chromium alloy steels. The discussion includes the automotive demand and development of specifications for the alloy steels. It also covers various research on heat treatment of alloy steels, providing information on hardening, transformation of austenite, hardenability testing, and tempering of as-quenched martensite.

This appendix is a collection of isothermal diagrams for carbon steels, chromium-molybdenum steels, nickel-chromium-molybdenum steels, nickel-molybdenum steels, and chromium steels.

This appendix is a collection of selected continuous cooling transformation diagrams for carbon steels; Mn steels; Mn-Mo, Mn-Ce, Mn-Ni-Mo, and Mn-Ni-CrMo steels; silicon steels; nickel steels; Ni-Cr-Mo steels; and chromium steels.