alloy steel/round bar(SAE4140/42CrMo) 1.die steel bar 2.hot rolled,black surface,hardness:<220HB alloy steel/round bar(SAE4140/42CrMo)1.die steel bar2.hot rolled,black surface,hardness:<220HB3.specification:thickness:30/35/40....350mmlength:2500-4000mm ,or as customer requested4.payment:prepay 30% deposit,TT or L/C at sight alloy steel/round bar(SAE4140/42CrMo)