1.higher intensity 2.better tenacity 3.wear-resistance.. specification: diameter 60---1500; length≤6000; weight≤50Tmaterial: 9Cr2Mo, 9Cr3Mo,86CrMoV7,MC3,MC5,GCr15,EN19, SAE 52100,etc.barrel hardness: HSD80----102 (higher hardness)barrel hardness evenness: ≤3HSDhardness depth (one side) 12---35mmstandard: GB/T13314-2008; GB/T15547-1995used for: cold rolling millmanufacturing process: ingot-forging ...