... .strict quality control 2.leadtime guarantee investment casting handle with stainless steel and carbon steel:1.Quality standard: ISO9001:20002.Technique: ... finishing; Argon arc welding; Sand blasting; Clearing and finishing; Heat treatment; Correction and inspectionMaterialSS:303,304,304L,316,316L,CF8,CF3 ... .4308,1.4408,1.4404,SCS13,SCS14,CD4,5AA etc CS:C20, C40, C45, WCB, WCC , 4340 etc AS: 15Cr3, ...