Production Name: Customized Large Diameter Seamless Hot Rolled Steel Ring Steel Grade: Alloy Steel:  42CrMo4 50Mn S48C 20CrMo 30CrMo 35CrMo,34CrNiMo6Carbon Steel:  C45 1045 S355NL A105 1020  1034  Stainless Steel: SUS304, 304L, 316LOthers: Gr15  Main Process: Forging & Ring Rolling Heat Treatment Machining Test Items: Lab:Chemical Composition, Mechanical Properties,Impact, Grain Size and etc.Dimensions TestUT TestHardness Test Our Capacity: 400mm to 4500mm  Max Weight: 5 Tons