Production method for optimizing drawing performance of steel wire rod for carbon steel welding wire

Abstract

The invention relates to a production method for optimizing the drawing performance of a steel wire rod for a carbon steel welding wire, belonging to the technical field of steel production. The technology path comprises the following steps of billet chemical composition control and inspection, heating of a walking heating furnace, rough rolling, top cutting by a flying shear, middle rolling, precision rolling in advance, high-speed precision rolling, sending and clamping, as well as spinning, temperature controlling, and disperse coil cooling, collecting coils, and steel wire rod inspection. The method is characterized in that through optimizing the technology parameters of operation key points, the effective control to microstructure of the steel wire rod for the carbon steel welding wire on a high-speed wire rod production line short of slow cooling capability is realized, and the frequent brittleness problem caused by the common structure reason in the drawing process, especially the high-speed drawing process of the steel wire rod for the carbon steel welding wire on produced on the production line is solved. The method has the advantages that the effective control of the steel wire rod structure for the carbon steel wire on the traditional high-speed line material production line can be realized without prolonging the length of slow cooling, and the generation of the low-temperature hard phase structure is avoided, thus the drawing performance of the steel wire rod is changed, and the requirement of drawing use of the type of the steel wire rod is met.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular provides a production method for optimizing the drawing performance of a wire rod for carbon steel welding wire, which is specially applied to the production of wire rod for carbon steel welding wire in a high-speed wire production line with a short slow cooling zone, and can be used Improve the drawing performance of this type of wire rod, and realize the direct drawing production welding wire without heat treatment. Background technique [0002] Welding is an advanced manufacturing technology. More than 40% of the steel materials in the world can serve human beings through welding. Although the consumption of welding materials is only about 0.6% of the consumption of steel products, its role must not be underestimated. Quality has become the key to the longevity of engineered structures. Welding wire is an ideal high-efficiency welding material, and it is wi...

AI Technical Summary

Problems solved by technology

However, the coarse austenite grains will significantly delay the completion of the phase transformation, and the length of the slow cooling zone is even more required. For iron and steel enterprises with relatively old equipment, such as the high-speed wire factory in Beijing of Shougang, limited by the production lines already built, it can be The length of the slow cooling zone provided is limited (less than 50 meters), and the coarse austenite grains obtained after spinning at high temperature are often difficult to complete the transformation to ferrite (or pearlite) in the heat preservation zone. When the cooling rate returns to above 1°C / s, low-temperature hard phase structures such as bainite will still be produced, such as figure 2 As shown, this instead caused the unevenness of the structure and deteriorated the drawing performance of the wire rod

In addition, the higher spinning temperature will cause the wire rod to generate a large amount of iron oxide scale, thereby losing the yield of the wire rod and increasing the material consumption

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