D3 1.with 10years professional experience 2.100% Ultrasonic Test as ... SEP1921C/C 3.ISO9001:2008 Certificate 1. D32. Equivalent grades: D3, DIN 1.2080/ X210Cr12, SKD1,3. Chemical Composition: CSiMnCrPS1.90 ... and plastics, Shear knives for thin sheets Thread rolling dies D3