Roasted hardened hot-dip galvanized steel plate with good shape and preparation method thereof
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A hot-dip galvanized steel sheet, bake hardening technology, applied in the field of hot-dip galvanized steel sheet production, can solve the problems of poor elongation, high cost, poor mechanical properties of hot-dip galvanized steel sheet, etc., to achieve excellent surface quality and formability excellent effect
Inactive Publication Date: 2018-03-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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[0008] The technical problem to be solved by the present invention is: the hot-dip galvanized steel sheet
Method used
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[0027] The present invention also provides a method for preparing the above-mentioned excellently formed bake-hardened hot-dip galvanized steel sheet, comprising the following steps:
[0028] The smelted molten steel is subjected to smelting-hot rolling-acid rolling-hot-dip galvanizing-annealing steps to obtain hot-dip galvanized steel sheets; the hot-rolling includes heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling steps.
[0029] Wherein, in the preparation method of the above-mentioned excellently formed bake-hardening hot-dip galvanized steel sheet, in order to prevent warping defects in the hot rolling process and ensure the high-temperature coiling temperature, the finishing rolling start temperature in the hot rolling is 1100-1250 ℃, and the final rolling temperature is 880-960 ℃.
[0030] Wherein, in the preparation method of the above-mentioned excellently formed bake-hardened hot-dip galvanized steel sheet, in order to obtain a s...
Embodiment 1-3
[0035] Embodiment 1-3 prepares hot-dip galvanized steel sheet with the inventive method
[0036] The specific operation steps are as follows:
[0037] (1) through common smelting process, prepared the baking hardening steel slab of chemical composition as shown in table 1 below:
[0038] Table 1 Chemical composition of bake-hardened hot-dip galvanized steel sheets with excellent formation (wt.%)
[0039] Numbering
C
Si
mn
P
S
als
B
1
0.06
0.02
0.21
0.007
0.007
0.034
0.0028
2
0.08
0.02
0.30
0.013
0.005
0.029
0.0032
3
0.05
0.01
0.026
0.009
0.006
0.046
0.0029
[0040] (2) After the above-mentioned slab is heated, dephosphorized, hot-rolled and laminar-flow cooled, a hot-rolled coil is obtained, wherein each parameter is set as shown in Table 2 below:
[0041] Table 2 Main process parameters of hot rolling
[0042] Numbering
Heating temperature / ℃ ...
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Yield strength
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Abstract
The invention belongs to the technical field of steel plate manufacturing, in particular to a hot-dip galvanized steel plate and a preparation method thereof. In order to solve the problems that the hot-dip galvanized steel plate prepared by an existing method is poor in mechanical property, is not good in extension property and the like, the invention provides the hot-dip galvanized steel plate and the preparation method thereof. The hot-dip galvanized steel plate is prepared from the following chemical components in percentage by weight: 0.04-0.08% of C, 0.01-0.04% of Si, 0.10-0.40% of Mn, less than or equal to 0.020% of P, less than or equal to 0.015% of S, 0.015-0.050% of Als, 0.0010-0.0040% of B and the balance of Fe and inevitable impurities. The preparation method for the hot-dip galvanized steel plate comprises the following steps: performing processes of smelting, hot rolling, acid rolling, hot-dip galvanizing and annealing on smelting molten steel, thereby obtaining the hot-dip galvanized steel plate. The hot-dip galvanized steel plate prepared by the preparation method has yield strength of 220-250 MPa, tensile strength of 320-380 MPa, elongation percentage greater thanor equal to 36.0%, n90 greater than or equal to 0.18, r90 greater than or equal to 1.5, BH greater than or equal to 30 MPa, and excellent mechanical properties and forming properties, and can meet using requirements of an automobile outer panel user.
Description
technical field [0001] The invention belongs to the technical field of hot-dip galvanized steel sheet production, and in particular relates to a well-formed bake-hardened hot-dip galvanized steel sheet and a preparation method thereof. Background technique [0002] Baking-hardening hot-dip galvanized steel sheets are widely used in auto parts, which not only require excellent stamping performance and surface appearance quality, but also require certain anti-sag performance and baking hardness to reduce noise during high-speed driving. Production technologies related to bake-hardened steel plates are: [0003] CN 103228808B provides a high-strength bake-hardening cold-rolled steel sheet with excellent bake hardenability, room temperature aging performance and deep drawing processability, and small in-plane anisotropy. The composition is C: 0.0010-0.0040%, Si: 0.005-0.05%, Mn: 0.1-0.8%, P: 0.01-0.07%, S: 0.001-0.01%, Al: 0.01-0.08%, N: 0.0010-0.0050%, Nb: 0.002-0.020%, and Mo...
Claims
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