carbon materials are inexpensive and easy to process. the mold does not embrittle even when repeatedly used.
而且,碳材料廉价且容易加工,即使重复使用模,也不会发生脆化。
under the experiment「s welding condition, wcx355 ultrafine grained steels didn」t distinctly embrittle in cghaz and didn't soften in tempering zone either.