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Production method for reducing dynamic drawing aging of low-carbon steel wire rods
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A technology of dynamic aging and production methods, applied in the direction of metal rolling, etc., can solve the problems that have not attracted enough attention
Active Publication Date: 2014-12-24
SHOUGANG CORPORATION
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[0004] The fundamental method to control the deformation aging and aging embrittlement of the wire drawing process lies in how to control the content of solid solution C and N in the structure of low carbon steel. For the control of solid solution N, generally in the process of steelmaking and continuous casting, the matrix There are certain requirements for N content, and AL deoxidation is used to ensure a certain amount of ALN precipitation, but the control of solid solution C and N in the high-wire rolling and cooling process has not attracted enough attention
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Embodiment 1
[0027] The present invention is applied in the production of ￠6.5mm cold-forged steel wire rod 22A in Shougang, and its technological characteristics are as follows:
[0028] (a) The low carbon steel continuous casting billet shape is 160 square meters, the N content of the billet is controlled at 50ppm, and the billet heating temperature is controlled at 1030°C
[0029] (b) The spinning speed is controlled at 85m / s, and the spinning ring diameter is controlled at 950mm
[0030] (c) The initial speed of the roller table of the Stelmo air-cooled line is controlled at 0.2m / s, and the insulation length of the insulation cover is controlled at 70m
[0031] (d) In the temperature range of 650-850°C, the holding time is controlled at 200s; the holding time in the temperature range of 600-650°C is required to be 200s
[0032] (e) The coil collection temperature is controlled at 600°C, and the slow cooling rate after coil collection is controlled at 0.5°C / s.
Embodiment 2
[0034] The present invention is applied in the production of ￠6.5mm ultra-low carbon wire rod and wire rod in Shougang. Its technological characteristics are as follows:
[0035] (a) The low carbon steel continuous casting billet shape is 160 square meters, the N content of the billet is controlled at 40ppm, and the billet heating temperature is controlled at 1050°C
[0036] (b) The spinning speed is controlled at 78m / s, and the spinning ring diameter is controlled at 1000mm
[0037] (c) The initial speed of the roller table of the Stelmo air-cooled line is controlled at 0.12m / s, and the insulation length of the insulation cover is controlled at 80m
[0038] (d) In the temperature range of 650-850°C, the holding time is controlled at 300s; the holding time in the temperature range of 600-650°C is required to be 240s
[0039] (e) The coil collection temperature is controlled at 600°C, and the slow cooling rate after coil collection is controlled at 0.3°C / s.
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Abstract
The invention relates to a production method for reducing dynamic drawing aging of low-carbon steel wire rods and belongs to the technical field of rolled steel. The method includes the steps of continuously casting low-carbon steel to obtain a 160-square billet, controlling N content of the billet to range from 40ppm to 50ppm, controlling heating temperature of the billet to range from 1050 DEG C to 1030 DEG C, controlling wire rod laying speed to range from 78m / s to 85m / s, controlling ring diameter of the laid wire rods to range from 950mm to 1000mm, controlling initial speed of a Stelmor air-cooling line roller bed to range from 0.12m / s to 0.2m / s, controlling insulation length of an insulation cover to range from 70m to 80m, controlling insulation time to range from 200s to 300s at the temperature interval of 650-850 DEG C, controlling coiling temperature to range from 600 DEG C to 610 DEG C, and controlling slow cooling speed to range from 0.3 DEG C / s to 0.5 DEG C / s after coiling. The method has the advantages that process operability is high, dynamic aging and drawing plastic aging deterioration can be reduced evidently for the produced wire rods, and the method is applicable to production of wire rods for low-carbon steel deep drawing in high speed wire rod mills.
Description
technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a production method for reducing the dynamic aging of low-carbon steel wire rod drawing, which is used for the development and production of low-carbon steel wire rod varieties in high-wire factories, and can effectively improve the deep drawing of wire rods. Improve the drawing performance, reduce the drawing hardening of the steel wire during the drawing process, and reduce the broken wire rate. Background technique [0002] The dynamic deformation aging of low-carbon steel has always been a problem that plagues steel mills and deep-processing enterprises. In severe cases, it will lead to an increase in the wire breakage rate during the material drawing process and affect production efficiency. The deformation aging phenomenon of cold-worked steel is the result of the interaction between interstitial solute atoms carbon and nitrogen in solid solution in ferrite ...
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