injection plastic box molding1.Material:P20,2738,718,45# 2.Cavity Qty:Single ... :LKM We are specialized in designing and making injection plastic box molding Product Name injection plastic box moldingCore & Cavity Steel S50C(45#),40Cr,P20H ... ,718H,2738,5CrNiMo,38CrMoAC,H13,S136HSteel hardness HRC 28--50Molding Way Compresion molding,Injection ...