Control method of cooling process of hot-rolled low-carbon boron-containing steel wire rod after rolling

Abstract

The invention discloses a control method of a cooling process of a hot-rolled low-carbon boron-containing steel wire rod after rolling and belongs to the technical field of rolling steel. The control method comprises the following process steps: controlling cooling with a standard Stelmor cooling line, wherein in the cooling process, a parameter is controlled as follows: the spinning temperature is controlled to 900-950 DEG C; controlling the ring space and cooling speed through controlling and regulating the roller way speeds of various radiating and cooling sections; and completely closing fans, and completely opening heat preservation covers so as to evenly cool wire rods, thus the grain size of low-carbon boron-containing steel wire rod ferrite is controlled to 10-25 mu m, the tensile strength is controlled to 300-360Mpa, the reduction of area is 70-90%, and the performance difference of the same ring is 10-25Mpa. The control method has the advantages that the control method can be adopted when the low-carbon boron-containing steel wire rod is produced in a high-speed wire rod plant, can be used for processing and producing high-end products such as an explosion line; and by using the control method, the processing and using efficiency of a user is improved, the portability of drawing and brittle failure is reduced, and the yield and production efficiency are improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, in particular to a method for controlling the cooling process of a hot-rolled low-carbon boron-containing steel wire rod after rolling. Background technique [0002] Hot-rolled low-carbon boron-containing steel wire rod is mainly used for processing and manufacturing high-end products such as copper-coated steel wire and galvanized steel wire for blasting industry and communication industry. It requires very high plastic index, and has certain tensile strength and cleaning performance. This requires that the structure of the wire rod is mainly ferrite, and the nucleation of ferrite is hindered by boron segregation at the austenite grain boundary, the amount of pearlite and tertiary cementite in the structure should be controlled as much as possible, and the fluctuation of the mechanical properties of the rod should be as small as possible . [0003] The spinning temperature and post-rolli...

AI Technical Summary

Problems solved by technology

The level of spinning temperature affects the grain size of the structure. Generally, the lower the spinning temperature, the finer the grains and the higher the tensile strength. For hot-rolled low-carbon boron-containing steel wire rods, excessive tensile strength It will affect the drawing effect and the loss of abrasive tools

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