spring flat bar thick : 1.0--45 wide : less than 350 longth : by order grade : SUP 3, SUP6, SUP7 , SUP9 , SUP10 spring flat barDear Sir or Madam :We are making the spring flat steel bar all the time , the detail information is as flw :1,Grade: GB: 65Mn ,55Si2Mn , 60Si2Mn ,55CrMnA ,60CrMnA ,50CrVA, 60CrMnBA,55SiMnVBA , 60Si2CrAJIS : SUP7,SUP9,SUP9A,SUP10,SUP11,SUP12ASTM: 1566 ,9255, 9260, 5155, ...