... However, as customer's requirement, we also use S136 stainless steel to build mould, The S136 do not need the chrome ... shape, YUANDA adopts Lathe, EDM and CNC machining center on mould building correspondingly. Perfect shaping, final volume matching, slight parting ... chrome plated to prevent the mould from rusting and increase mould surface hardness for long time use, the different coatings also are ...