HR and CR stainless steel coils 是什么

HR and CR stainless steel coils 是什么 secondary cr/hr coils Secondary steel GI,EG, CR, HR. HDG, PPGI, CRNGO, steel sheet and coil”其中的“GI, EG,CR, HR, HDG, PPGI, CRNGO”是什么意思?或者说代表了钢材方面的那种材质吗?急! STAINLESS. stainless hr. hr stainless steel and other pipe fittings什么意思 CR 英语翻译Z40Y-150LB/8：GATE VALVE CARBON STEEL BODY ASTM A216 GR.WCB,INSIDE OF SUPERDUPLEX STAINLESS STEEL ASTM A 182 GR.F 55 (UNS S32760) (25 Cr-8 Ni-3 Mo) YOKE AND EXTERNAL STRING,SCREWED BONETTE,SOLIDWEDGE,REPLACEABLE SEATS,OPERATED WITH HAND ALL STAINLESS all stainless dishwashed stainless stainless steel stainless steel stainless steel 求管件类型英语翻译快Now, I am looking for carbon steel: HR CR GA GI EG ETP coil, sheet, round bars, pipe, HMS1/2, HMS1, used rails, etc 什么是HR?