A kind of cold-rolled hot-dip galvanized dual-phase steel and preparation method thereof
A technology for hot-dip galvanizing and dual-phase steel, which is applied in the field of cold-rolled hot-dip galvanizing dual-phase steel, can solve the problem that the welding performance and stamping performance of hot-dip galvanizing dual-phase steel need to be improved, the quality of galvanizing is reduced, and martensite is disadvantageous. The problem is to reduce the strength difference, improve the flange flanging performance, and improve the flange elongation performance.
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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
Description
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