... % UT acco to En1921D/d Special steel 42CrMo4 1.Grade:42CrMo, AISI 4140/4142, DIN 42CrMo4/1.7225, JIS SCM42.Chemical composition ... .3.Induction hardening to increase the mechanical properties. 6.Applications: 42CrMo4 is for making hafts, gears and columns for industry mechanics ... : America/Asia/EuropeHuangshi Youli Special Steel Co.,Ltd Special steel 42CrMo4