characteristics and applications: A medium carbon , chromium-molybdenum steel. Available as hot rolled and cold finished bar and seamless tube ,this steel is for general purpose applications. Variations in heat treatment can obtain a broad range of strength and toughness. This steel has good hardenability,strength,wear resistance,toughness and ductility. In heat treated condition,it offers good strength and toughness for moderately stressed parts. It is available in forging quality, and aircraft quality increases.