What is 301 stainless steel with FH hardness? People don't know - 80% Precision stainless steel - Spring stainless steel belt | 3 | stainless steel spring

301 stainless steel belt, everyone only commonly heard H, EH, SEH these, FH what is, in fact FH is H, we often say English Full name is the Full Hard, all is the translation of Hard. Communication between domestic many of his peers are using these colloquial hardness code, but have not seriously to study English full name, also not understand the meaning of it tags: 301 stainless steel with 301 super hardened stainless steel with stainless steel spring