... 5140,4130, 1022, GCr15 , 8620H ,SS400,ST37,15CrMo,20CrMo,35CrMo, cold rolled round bar We are making the round steel bar all ... : 12mm-250mmMaterial: 60Si2Mn, 65Mn, 50CrVA, 60Si2CrVA 7. hot rolled die steel, bearing steel, carbon tool steel Size: 12mm-250mmMaterial: H13, T8 ... , T9, T10, GCr15 8. cold-drawn round bar/ square steel/ ...