ER70S-6 hot rolled wire rod and preparation method thereof

Abstract

The invention relates to the technical field of steel and iron materials and in particular relates to an ER70S-6 hot rolled wire rod and a preparation method thereof. In the process steps, deoxidation treatment is performed on the liquid steel by use of a non-calcium alloy material to avoid the increase of the calcium content in the steel, and furthermore, splashing in the process of welding is avoided. The carbon content in the steel is reduced so that the strength of the wire rod can be reduced; the percentage of area reduction and the percentage elongation of the wire rod are increased, in other words, the plasticity of the wire rod is improved, and consequently, the wire rod can be drawn into a welding wire directly without annealing and the production cost of a welding wire factory is reduced; besides, in the preparation process, the quality of the ER70S-6 hot rolled wire rod is improved by controlling the contents of various elements, such as carbon, silicon and magnesium, so that the welding property of the welding wire is improved; in the cooling process of rolling, draught fans on an air cooling line are all turned off and thermal insulation covers are all closed so that the highest tensile strength of the wire rod does not exceed 550MPa and the plasticity of the wire rod is good.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to an ER70S-6 hot-rolled wire rod and a preparation method thereof. Background technique [0002] In recent years, my country's gas-shielded welding wire has developed rapidly, and its consumption is increasing. Therefore, the market demand for gas-shielded welding wire rods has increased rapidly. ER70S-6 hot-rolled wire rod is the raw material for drawing welding wire. ER70S-6 welding wire is a foreign gas shielded welding wire variety. This welding wire has good arc stability and high weld performance during welding. Its composition Strictly controlled by the American Welding Association AWSA5.18 "Gas Shielded Welding Carbon Steel Welding Wire Regulations", which is equivalent to the ER50-6 grade of GB / T8110—1995 (Steel Wire for CO2 Gas Shielded Welding) and GB / T3429—1994 "Welding The H11Mn2SiA grade of Steel Wire Rod and the YGW12 grade of JISZ3312-1993 "Low Car...

AI Technical Summary

Problems solved by technology

[0004] Moreover, the chemical composition range of the ER70S-6 welding wire steel wire rod standard is relatively large, and its comprehensive performance is difficult to meet the user's requirements without strict optimization control.

However, some residual elements and inclusions with low melting point and volatile at high temperature will seriously affect the welding operation, weld quality and aesthetics of the welding wire, and these elements have not been included in the standard optimization control, which makes the welding wire made according to the standard. Wire rod is difficult to meet market demand

[0005] For this reason, some researchers have made research on welding wire wire rod, such as No. 200810048226.3 "Production method of high-quality high-carbon steel hot-rolled wire rod for drawing", No. 200910088148.4 "A kind of microalloyed SWRH87B hot-rolled wire rod and Its manufacturing method", No. 201020202199.3 "A Φ5.5mm cord steel hot-rolled wire rod production device" and No. 201210331239.8 "A kind of Nb-containing micro-alloyed high-carbon steel hot-rolled wire rod and its manufacturing method" etc.; however, due to The research of the existing technology in this field is relatively limited, which leads to the performance and quality of the obtained welding wire and wire rod products are still difficult to meet the needs of users, especially the demand for ER70S-6 welding wire steel wire rod