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 ... Daqiuzhuang Tianjin, which is one of the largest steel production base in China. The spring flat steel we produce has the ... Co., LTD(CNHTC), Shandong Wuzheng(Group) Co., LTD and etc. alloy spring steel bar