... 60Si2Mn, 65Mn, SUP9, SUP7, 55CR3, 50CRV4, SAE5160 spring steel flat bar The national standard specifications. material is: 60Si2Mn, ... Nanjing, Xing Cheng, Daye and other manufacturers spring flat steel, the material is complete, complete specifications, the ... T 1222-1984 Our company can offer Xingcheng spring steel, flat steel spring and spring mainly round spot.Common specifications have spot. ...