... steel bar 1.60Si2Mn,SUP9,SUP10,65Mn 2.Size:6*40-20*150 3.JISG4801/GB/T1222 4.Surface:Smooth,Double ... 154 Length 2-8m, or as your requirements4) Surface: Smooth Plain, Double Grooved5) Mechanical Property Chart Heat Treatment System ... :We are a large-scale manufacturer for spring steel bar in Daqiuzhuang Tianjin, which is one of the largest ... Wuzheng(Group) Co., LTD and etc. alloy spring steel bar