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Cold-rolled hot-galvanized dual-phase steel and preparation method thereof

A hot-dip galvanized, dual-phase steel technology, which is applied in the field of cold-rolled hot-dip galvanized dual-phase steel, can solve the problems of hot-dip galvanized dual-phase steel welding performance and stamping performance, lower galvanizing quality, unfavorable martensite, etc. problem, to achieve the effect of reducing the strength difference, improving the performance of flange flanging, and improving the performance of flange extension

Active Publication Date: 2014-07-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hot-dip galvanized cold-rolled dual-phase steel is interrupted after annealing due to the temperature requirement of galvanizing, so it is prone to the problem of low hardenability, and it is not conducive to cooling to form martensite after hot-dip galvanizing
In addition, the hot-dip galvanized cold-rolled dual-phase steel prepared by the existing method has too many Si and Mn elements, and the Si and Mn elements are easily enriched on the surface of the steel plate during the annealing process, thereby reducing the galvanizing quality; in addition, the existing method prepared The welding performance and stamping performance of hot-dip galvanized dual-phase steel also need to be improved

Method used

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  • Cold-rolled hot-galvanized dual-phase steel and preparation method thereof
  • Cold-rolled hot-galvanized dual-phase steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] The cold-rolled hot-dip galvanized dual-phase steel used in this embodiment and its preparation method comprise the following steps:

[0027] (1) The molten steel is smelted in a converter, and the continuous casting billet is obtained by continuous casting;

[0028] (2) hot-rolling the continuous casting slab to obtain a hot-rolled plate, and further cold-rolling the hot-rolled plate to obtain a chilled steel strip;

[0029] (3) The above-mentioned chilled steel strip is subjected to a continuous galvanizing and annealing process to obtain a finished product.

[0030] During the smelting process: (1) Control the end point temperature of converter smelting: first furnace 1658°C, continuous pouring furnace 1645-1665°C; (2) Use Al-Fe for deoxidation; use Mn-Fe with Mn, use Cr-Fe with Cr; The amount of slag under tapping is ≤80mm, and the tapping time is ≥4 minutes; the slagging agent is added during the tapping process, and the slag is added at the early stage of tapping...

Embodiment 2

[0032] The cold-rolled hot-dip galvanized dual-phase steel used in this embodiment and its preparation method comprise the following steps:

[0033] (1) The molten steel is smelted in a converter, and the continuous casting billet is obtained by continuous casting;

[0034] (2) hot-rolling the continuous casting slab to obtain a hot-rolled plate, and further cold-rolling the hot-rolled plate to obtain a chilled steel strip;

[0035] (3) The above-mentioned chilled steel strip is subjected to a continuous galvanizing and annealing process to obtain a finished product.

[0036] During the smelting process: (1) Control the end temperature of converter smelting: first furnace 1665°C, continuous casting furnace 1645-1665°C; (2) Use Al-Fe for deoxidation; use Mn-Fe with Mn, use Cr-Fe with Cr; The amount of slag under tapping is ≤80mm, and the tapping time is ≥4 minutes; the slagging agent is added during the tapping process, and the slag is added at the early stage of tapping, and ...

Embodiment 3

[0038] The cold-rolled hot-dip galvanized dual-phase steel used in this embodiment and its preparation method comprise the following steps:

[0039] (1) The molten steel is smelted in a converter, and the continuous casting billet is obtained by continuous casting;

[0040] (2) hot-rolling the continuous casting slab to obtain a hot-rolled plate, and further cold-rolling the hot-rolled plate to obtain a chilled steel strip;

[0041] (3) The above-mentioned chilled steel strip is subjected to a continuous galvanizing and annealing process to obtain a finished product.

[0042] During the smelting process: (1) Control the end temperature of converter smelting: first furnace 1667°C, continuous pouring furnace 1645-1665°C; (2) Use Al-Fe for deoxidation; use Mn-Fe with Mn, use Cr-Fe with Cr; The amount of slag under tapping is ≤80mm, and the tapping time is ≥4 minutes; the slagging agent is added during the tapping process, and the slag is added at the early stage of tapping, and ...

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Abstract

The invention relates to a cold-rolled hot-galvanized dual-phase steel. The cold-rolled hot-galvanized dual-phase steel is composed of the following chemical components in percentage by weight: 0.02-0.05% of C, 0.1-0.2% of Si, 0.8-1.3% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.04-0.08% of Al, 0.5-0.7% of Cr, less than or equal to 0.01% of V, less than or equal to 0.05% of B and the balance of Fe. The invention also relates to a preparation method of the cold-rolled hot-galvanized dual-phase steel. The preparation method comprises the following steps: performing continuous casting on steel liquid smelted previously by use of a converter so as to obtain a continuous casting billet; performing hot rolling on the continuous casting billet to obtain a hot-rolled slab and performing cold rolling on the hot-rolled slab to obtain cold and hard strip steel; performing continuous galvanizing annealing process treatment on the cold and hard strip steel so as to obtain the finished cold-rolled hot-galvanized dual-phase steel. The cold-rolled hot-galvanized dual-phase steel has the advantage that the galvanizing quality, the plasticity, the welding property and the stamping property are improved on the basis of satisfying the strength requirement.

Description

technical field [0001] The invention relates to the technical field of cold-rolled hot-dip galvanized dual-phase steel, in particular to a cold-rolled hot-dip galvanized dual-phase steel and a preparation method thereof. Background technique [0002] Due to the temperature requirement of galvanizing, the cooling of hot-dip galvanized cold-rolled dual-phase steel is interrupted after annealing, so it is prone to the problem of low hardenability, and it is not conducive to cooling to form martensite after hot-dip galvanizing. In addition, the hot-dip galvanized cold-rolled dual-phase steel prepared by the existing method has too many Si and Mn elements, and the Si and Mn elements are easily enriched on the surface of the steel plate during the annealing process, thereby reducing the galvanizing quality; in addition, the existing method prepared The welding performance and stamping performance of hot-dip galvanized dual-phase steel also need to be improved. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C38/24C22C38/18C22C33/04C21D8/02
Inventor 韩赟邝霜姜英花刘华赛齐秀美朱国森王勇围王海全尉冬刘广会滕华湘
Owner SHOUGANG CORPORATION
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