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Roughing method for improving surface quality of low-carbon steel wire rods

A surface quality, low-carbon steel technology, applied in the field of steel rolling, can solve problems such as poor metal rheology, low deformation temperature, and large deformation at corners

Active Publication Date: 2013-08-28
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a rough rolling method for improving the surface quality of low-carbon steel wire rods. Through in-depth basic experimental research and process trial production analysis, the theory of wrinkle defects caused by corner deformation during billet rolling has been enriched. At the same time, aiming at factors such as large corner deformation, low deformation temperature, and poor metal rheology, combined with a series of measures such as pass design, temperature control, and roll operation status in the rough rolling process, a control method for rough rolling of low carbon steel wire rods is proposed. The process for the surface defects of the intermediate billet is suitable for the process formulation of high-end wire factories in the production of low-carbon steel, ultra-low carbon steel, cold heading steel, riveting screw steel and other varieties

Method used

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  • Roughing method for improving surface quality of low-carbon steel wire rods
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  • Roughing method for improving surface quality of low-carbon steel wire rods

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Embodiment 1

[0032] The present invention is applied in the production of ￠6.5mm 22A wire rod in Shougang Shuigang No. 2 wire rod. After implementing this technology, the pass rate of 1 / 3 cold upsetting of 22A is increased from 70% to 93%. The technological characteristics are as follows:

[0033] (a) The corner temperature of the 150m3 low-carbon steel continuous casting slab is controlled at 980°C. During the rough rolling process, the roll temperature and rolling speed are controlled, and the surface temperature of the red slab is 700°C during the rolling process;

[0034] (b) The width of the first rough rolling stand is controlled at 20mm, the slope of the side wall of the box pass is controlled at 12°, and the true strain of the corner processing is controlled at 0.8; the roll period of the first rough rolling stand is 600 tons, the rolling speed is controlled at 0.13m / s, and the temperature before the roll touches the billet is controlled at 60°C;

[0035] (c) The width of the secon...

Embodiment 2

[0037] The present invention is applied in the production of ￠6.5mm22A wire rod in Shougang. The pass rate of 1 / 3 cold top forging of 22A is increased from 85% to 95%. The process features are as follows:

[0038](a) The corner temperature of the 160 m3 low-carbon steel continuous casting slab is controlled at 1000°C. During the rough rolling process, the temperature and rolling speed of the rolls are controlled, and the surface temperature of the red slab is 720°C during the rolling process;

[0039] (b) The width of the first rough rolling stand is controlled at 22mm, the slope of the side wall of the box pass is controlled at 14°, and the true strain of the corner processing is controlled at 0.9; the roll period of the first rough rolling stand is 4800 tons, the rolling speed is controlled at 0.12m / s, and the temperature before the roll touches the billet is controlled at 70°C

[0040] (c) The width of the second rough rolling stand is controlled at 18mm, the slope of the s...

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Abstract

The invention belongs to the technical field of steel rolling, and relates to a roughing method for improving surface quality of low-carbon steel wire rods. The roughing method is applicable to process formulation of high-speed wire rod mills during production of cold heading steel and rivet and screw steel by means of process parameter optimization of steel billet rolling beginning temperature, steel billet corner temperature, roughing pass design, rolling speed, roll states and the like, and is used for controlling linear and cluster defects on red billet surfaces caused by roughing, decreasing folds and cracks on surfaces of finished wire rods, and improving drawing and cold upsetting performances of the wire rods. Surface quality of low-carbon cold heading steel wire rods is improved, and one-third cold upsetting qualified rate can be stabilized above 90%.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a rough rolling method for improving the surface quality of low-carbon steel wire rods, which is used for controlling linear and cluster defects on the surface of red billets caused by rough rolling, and reducing wrinkles on the surface of finished wire rods Cracks, improve the drawing and cold upsetting performance of wire rod. Background technique [0002] Surface quality has always been the top priority in the development of wire rod varieties. Good surface quality is the threshold for wire rod varieties to enter the mid-to-high-end market. It is also important for low-carbon steel wire rod surface quality. On the one hand, users want to reduce the broken wire rate in the drawing process. On the other hand, it is necessary to ensure the cold forging performance of steel wire products, ensure the pass rate of processed standard parts, and have strict requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/16B21B37/74B21B37/46B21B37/58B21B37/56
Inventor 王猛罗志俊王丽萍王立峰李舒笳杨茂林李正嵩史昌李三凯
Owner SHOUGANG CORPORATION