A tensile strength of 1 000 MPa grade high strength steel wire preparation process

Objective In order to solve the current domestic tensile strength of 1000 MPa grade wire in the preparation process of the wire rod annealing is not uniform, the drawing process of the wire is easy to brittle breakage, production costs and other issues. The use of roller drawing + mold drawing hybrid drawing process for the preparation of tensile strength of 1000 MPa high strength steel welding wire. Methods The mixed drawing process is proposed for the preparation of wire and traditional mold drawing preparation of wire for comparison test, the effect of wire drawing process on tensile strength and yield strength of wire rod is studied.Effect of annealing process on O, N content and microstructure of wire rod are analyzed. By comparing the surface quality of welding wire before and after electrolysis, the effects of annealing process and ultrasonic electrolytic cleaning on the surface quality of welding wire are studied. By comparing the parameters of welding spatter rate, penetration and melt width, the welding technology before and after copper plating are analyzed. Results The test results show that, through the reasonable control of the channel surface reduction rate and drawing forward speed, easier to achieve a larger surface reduction rate under the stable preparation process of the wire, wire rod after 1050 ℃ continuous annealing can effectively eliminate the wire rod residual stress, greatly reducing the probability of pulling wire breakage. Wire rod microstructure is mainly martensite-based with a small amount of bainite, and cementite, the uniform structure of the wire rod is easier to prepare stable performance of the wire. Wire by ultrasonic electrolytic cleaning, blow-drying and oiling to obtain the final hybrid drawing + no copper plated oiling preparation process. Conclusion Through the roller drawing + mold drawing of the hybrid drawing process to prepare tensile strength 1000 MPa grade of high strength steel wire, and O, N content≤0.005%, the organization is uniform and stable, effectively ensure that the tensile strength and the yield strength of the wire rod, the surface quality of the uniformity and stability, the weld craftsmanship is excellent.