AISI 4140 Alloy Steel (UNS G41400)
AISI 4140 Alloy Steel (UNS G41400) Alloy steels are designated by AISI fourdigit numbers and comprise different kinds of steels, each with a composition which exceeds the limitations of B, C, Mn, Mo, Ni, Si, Cr, and Va set for carbon steels. AISI 4140 alloy steel is a chromium, molybdenum, and manganesecontaining low alloy steel.