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Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet

A technology of tissue transformation and cooling process, applied in the field of steel rolling

Active Publication Date: 2010-03-10
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for controlling microstructure transformation of billet ultra-low carbon wire rod during continuous cooling, which solves the problem of cooling process and microstructure control after hot-rolled wire rods for copper-clad steel wire are rolled, and produces ultra-low carbon billets for rolling. The wire rod provides data support on the grain size control and the amount of tertiary cementite precipitation

Method used

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  • Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet
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  • Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet

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Embodiment 1

[0015] The invention is adopted in rolling production of high-quality ultra-low carbon steel SWRM6 wire rod in the first wire rod factory of Shougang. Adopt the cooling process of the present invention to mass-produce SWRM6 wire rods with specifications of ￠6.5mm that meet the requirements in Shougang, open the heat preservation cover after rolling, control the cooling rate at 5°C / s after rolling, and ferrite grain size at 10-15 μm , There is basically no tertiary cementite precipitation in the wire rod structure, the tensile strength of the wire rod is 320-350MPa, and the area reduction rate is greater than 75%, which meets the requirements of users and national standards, and is used for processing and producing copper-clad steel wire.

Embodiment 2

[0017] The invention is adopted in rolling production of high-quality ultra-low carbon steel SWRM6 wire rod in the first wire rod factory of Shougang. Using the cooling process of the present invention, SWRM6 wire rods with a specification of ￠6.5mm that meet the requirements are produced in batches in Shougang. After rolling, all heat preservation covers are closed, the cooling rate after rolling is controlled at 0.5°C / s, and the ferrite grain size is 20- 30μm, a large amount of tertiary cementite is precipitated at the grain boundary position in the wire rod structure, the tensile strength of the wire rod is 300-320MPa, and the area reduction rate is greater than 85%.

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Abstract

The invention relates to a structural transformation control method in a continuous cooling process of an ultra-low-carbon wire rod of a square billet, belonging to the technical field of steel rolling. Aiming at the structural transformation in the continuous cooling process after thermal simulation transformation is carried out on a hot-rolling steel wire rod for a copper-clad steel wire, a continuous cooling structural transformation curve of the hot-rolling steel wire rod for the copper-clad steel wire is analyzed through structural transformation characteristics in the continuous coolingprocess under different cooling rates after the hot transformation. The invention solves the problems of cooling process and structural control after the hot-rolling steel wire rod for the copper-cladsteel wire rod is rolled, and provides data support on crystallite dimension control and tertiary cementite precipitation number for rolling and producing the ultra-low-carbon wire rod of the squarebillet.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular provides a method for controlling microstructure transformation in the continuous cooling process of billet ultra-low carbon wire rods, which is mainly used for post-rolling microstructure control of hot-rolled wire rods for copper-clad steel wires. Background technique [0002] The main purpose of billet ultra-low carbon wire rod hot-rolled wire rod is to make copper-clad steel wire products for the communication field after drawing and copper plating. Its hot-rolled wire rod should have good drawing and elongation properties. Therefore, the structure of the hot-rolled wire rod should be dominated by fine ferrite, and the amount of tertiary cementite in the structure should be controlled as much as possible. In addition, there are upper and lower limit requirements for the tensile strength and area shrinkage of billet ultra-low carbon wire rod hot-rolled wire rod, so the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/06C21D11/00
Inventor 王坤王全礼李永东孙佳陈明跃王猛王立峰陈兆阳袁辉
Owner SHOUGANG CORPORATION
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