MATERIALS AND GRADES Brinell Hardness (HB) Tensile Strength USER GUIDE MATERIAL GROUPS Hardness Conversion Table N/mm2 Kpsi 80 560 80 560 200 100 700 100 700 120 840 120 840 140 980 300 140 980 160 1120 160 1120 180 1260 180 1260 200 1400 400 200 1400 220 1540 220 1540 240 1680 240 1680 500 260 1820 260 1820 280 1960 280 1960 300 2100 300 2100 600 320 2240 320 2240 700 10 20 30 40 50 60 70 Rockwell “C” Hardness (HRC) 494 ISCAR