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321CUTTING MATERIAL GRADES AND ENGINEERING MATERIALSHardness Conversion Table22402100196018201680154014001260112098084070056010 20 30 40 50 60 7032030028026024022020018016014012010080200300400500600700N/mm2 Kpsi80 560Brinell Hardness (HB)100 700120 840140 980160 1120180 1260200 1400220 1540240 1680260 1820280 1960300 2100320 2240 Tensile StrengthRockwell %u201cC%u201d Hardness (HRC)
