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Hot rolling method for reducing low-carbon steel wire rod mixed crystal structures for cold upsetting

A low-carbon steel and wire rod technology, which is applied in the field of steel rolling, can solve problems such as mixed crystals, and achieve the effect of improving drawing performance, cold heading performance, and optimizing microstructure and performance

Active Publication Date: 2018-07-27
LIUZHOU IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a hot rolling method for reducing the mixed-crystal structure of low-carbon steel wire rod for cold heading, and solves the mixed-crystal phenomenon of the cross-sectional structure of low-carbon steel wire rod for cold heading with a small size of Φ6.5mm

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Embodiment Construction

[0029] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the present invention is now described.

[0030] The hot rolling method of the present invention is used for rolling Φ6.5mm specification cold heading low carbon steel wire rod ML08Al, SWRCH6A, and described cold heading low carbon steel wire rod is Φ6.5mm specification cold heading low carbon steel wire rod, The chemical composition of ML08Al is: C: 0.05~0.08Wt%, Si: 0~0.07Wt%, Mn: 0.30~0.50Wt%, P: 0~0.020Wt%, S: 0~0.010Wt%, Alt: 0.020~ 0.040Wt%, Ni: 0~0.20Wt%, Cr: 0~0.20Wt%, Cu: 0~0.20Wt%, As: 0~0.080Wt%, the chemical composition of SWRCH6A is: C: 0~0.07Wt%, Si : 0~0.04Wt%, Mn: 0.15~0.35Wt%, P: 0~0.020Wt%, S: 0~0.008Wt%, Alt: 0.020~0.040Wt%, Ni: 0~0.20Wt%, Cr: 0 ~0.20Wt%, Cu: 0~0.20Wt%, As: 0~0.080Wt%. The hot rolling method for reducing the mixed grain structure of the low carbon steel wire rod for cold heading of the present invention comprises:

[0...

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Abstract

The invention provides a hot rolling method for reducing low-carbon steel wire rod mixed crystal structures for cold upsetting. The hot rolling method for reducing low-carbon steel wire rod mixed crystal structures for cold upsetting comprises the following steps: step A, controlling the heating temperature of a billet, controlling the temperature of a soaking zone at 1050-1090 DEG C, controllingthe temperature of a heating section 2 at 1080-1120 DEG C, and controlling the temperature of a heating section 1 at 880-920 DEG C; step B, controlling inlet finishing temperature at 840-880 DEG C; step C, controlling the finishing rolling temperature of an outlet finishing machine at 990-1020 DEG C; and step D, controlling laying temperature at 830-870 DEG C. The low-carbon steel wire rod mixed crystal structures for cold upsetting can be controlled effectively, the drawing performance and the cold upsetting performance of cold upsetting steel wire rods are improved remarkably, and the hot rolling method is suitable for optimization of performance of low-carbon steel wire rods of high-speed wires.

Description

technical field [0001] The invention relates to the field of steel rolling, in particular to a hot rolling method for reducing the mixed crystal structure of low-carbon steel wire rods for cold heading, which is suitable for the control process of wire rod structure for high-speed wire rod cold heading, so as to improve the drawing and cold heading of wire rods, etc. Deep processing performance. Background technique [0002] The internal mixed crystal structure of steel is a common structural defect of the material. In a single metallographic field of view, the grain size and shape of the structure are different. The grains are fine and uniform, and the coarse grains are distributed on the surface of the wire rod, occasionally appearing in local areas and their positions are not fixed. The Japanese JIS industrial standard believes that the mixed crystal structure is the structure in which grains with a grain size difference of ≥3 grades appear most in a certain field of vie...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B37/76B21B1/16
CPCB21B1/16B21B37/74B21B37/76B21B2261/20
Inventor 罗兴壮邓深樊雷李伟平苏捷杰钱学海黄开乐林欢甘超军
Owner LIUZHOU IRON & STEEL