... /GB/T 1222 4.Surface:Smooth,Double Groove 60Si2Mn spring flat steel priceSpecification1) Grade: 60Si2Mn,SUP7,G92600,61SiCr7, ... ≤8mm28%>8-30mm23%>30mm18%17) Production Line: Short stress tandem rolling line18) Place of Origin: Tianjin China19) Package Details: In ... and railway carriage, cylinder relief valve spring, check valve spring and the heatproof spring in the non-corrosive medias under the ...