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 ... with many big company, such as China National Heavy Duty Truck Group Co., LTD(CNHTC), Shandong Wuzheng(Group) Co., LTD and ...