... , stable linearity, excellent cast and helix, good coil-forming ability for the spring.Diameter: 0.2mm-15.0mmGrade:316,304,200 ... linearity, excellent cast and helix, it can be widely used for rolling various precision spring.MaterialChemical compositionGradeCSiMnPSNiCrCuMoOther2010.1515.5-7.50.060 ...