alloy spring steel bar 1.60Si2Mn,SUP9,SUP10,65Mn 2.Size: ... 150 3.JISG4801/GB/T1222 4.Surface:Smooth,Double Grooved alloy spring steel barSpecification1) Grade:60Si2Mn,SUP7,55CrMnA,SUP9,50CrVA,SUP10, ... quality, reasonable price and good after-sales service,Daqiang spring flat steel has been sold to most provinces at home ... ., LTD(CNHTC), Shandong Wuzheng(Group) Co., LTD and etc. alloy spring steel bar