Production process research of wire rod for EM12 and EH14 for submerged arc welding wire

To introduce the production process of wire rod for EM12 and EH14 submerged arc welding wire.Such measures are taken as controlling chemical composition,using compound deoxidant containing Al but without Si and low carbon ferromanganese deoxidizing to alloy,LF refine control oxygen(solution oxygen mass fraction is controlled at 0.002% to 0.004%),rolling controlling(starting rolling at 1 020 to 1 080 ℃,wire rod laying temperature is 920 to 940 ℃ for EM12,860 to 880 ℃ for EH14),the Stelmor slow cooling(cooling speed is less than 1 ℃/s after rolling).Weld metal mechanical properties experiment of diameter 4.0 mm finished were done,the result show that practical test tensile strength is 485 MPa for EM12,535 MPa for EH14;practical yield strength is 410 MPa for EM12,450 MPa for EH14;practical elongation is 32% for EM12,27.5% for EH14;practical impact work is 58,46,41 J for EM12,89,96,85 J for EH14,all these meet the AWS A5.17 demands.No quality problem appeared in consumers' use.