A method for improving the performance uniformity of high carbon steel wire rod in the same circle

Abstract

The invention provides a method for improving the uniformity of the performance of the high carbon steel wire rod in the same circle. By adding a wind deflector device on the outlet of the air duct, the lateral air volume distribution of the wire rod is changed, the lateral temperature fluctuation of the wire rod is reduced, and the uniform structure is achieved. The purpose of reducing the performance fluctuation of the same ring. At the same time, the controlled cooling process is optimized, and the distance and cooling speed of the adjacent two circles of wire rods are controlled in sections, so that the overall strength of the wire rods is improved. The transverse temperature fluctuation of the high carbon steel wire rod produced by this method is less than 20℃, the strength fluctuation of the same ring of the wire rod is less than 40MPa, and the minimum strength is increased by more than 20MPa, the sorbite ratio is ≥80%, and there is no bainite and martensite. For abnormal tissues, the customer's drawing wire breakage rate is ≤0.3 times / ton.

Description

technical field [0001] The invention belongs to the technical field of steel rolling production, and particularly relates to a method for improving the uniformity of the performance of a high-carbon steel wire rod in the same circle. Background technique [0002] High carbon steel wire rod is the main raw material for the production of prestressed steel strands and wire ropes, and the stability of its product performance is very important to the stability of the downstream customer's production process and finished product performance. The tensile strength of the wire rod fluctuates greatly, which will cause the stress state of the die and the load of the wire drawing machine to be in an unstable state during the drawing process of the wire rod, resulting in a large die loss and an increase in the drawing wire breakage rate, which affects the production efficiency and steel wire. quality. In addition, it will cause the steel wire to slip and the tensile stress is unstable d...

AI Technical Summary

Problems solved by technology

However, through an accurate analysis of the lateral cooling of the wire rod in the actual production process, for the wire rod within the 1 / 6D area at the end of the lap point, the stacking density is between the lap point and the non-lap point, and the air volume in this area The area of ​​the overlapped point is large, resulting in a mismatch between the stacking density and the air volume, and it is easy to form a local strong cold area here, which causes large lateral temperature fluctuations, and the temperature difference can reach more than 60°C, which in turn causes large fluctuations in the performance of the same coil of the wire rod

Especially for high-carbon steel with high Cr content, due to the high cooling intensity, the performance fluctuation phenomenon in the same circle is more obvious, which cannot be completely eliminated by relying on the Jialing device alone.

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