... quality control 2.leadtime guarantee investment casting handle with stainless steel and carbon steel:1.Quality standard: ISO9001:20002. ... Argon arc welding; Sand blasting; Clearing and finishing; Heat treatment; Correction and inspectionMaterialSS:303,304,304L,316,316L,CF8, ... 40Cr etcsizeAccording to customers' requirementdesignpacking investment casting handle with stainless steel and carobn steel