1.heating treatment with hardened and tempered 2.thickness:0.2-2.5mm 3.width:10-300mm 3.manufacture in many years 4.MOQ:3ton polished spring steel 1.Gradeck75 c75s sae10742.techniquehardened and tempered,annealed,cold rolled3.Hardness30-55HRC4.MOQ5 tons for trial5.Colorwhite,blue,yellow,grey,golden,navy,black6.Surfacepolish,polish-yellow,polsh-blue,gery-blue,unpolish7.Size(thickness&width)0.15-2. ...