Roasted and hardened hot galvanized steel plate and preparation method thereof
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A hot-dip galvanized steel sheet and bake hardening technology, applied in the field of hot-dip galvanized steel sheet production, can solve the problems of poor elongation performance and poor mechanical properties of hot-dip galvanized steel sheet, and achieve the effects of excellent surface quality and excellent formability.
Inactive Publication Date: 2018-02-27
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
[0009] The technical problem to be solved by the present invention is: the mechanical properties of the hot-dip galvanized steel sheet prepared by the existing method are not good, the elongation performance is not good, etc.
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[0027] The present invention also provides a method for preparing the above-mentioned 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 bake-hardened hot-dip galvanized steel sheet, in order to prevent warping defects in the hot rolling process and ensure the high-temperature coiling temperature at the same time, the starting temperature of the finish rolling in the hot rolling is 1100-1250° C. The rolling temperature is 880-960°C.
[0030] Wherein, in the preparation method of the above-mentioned bake-hardened hot-dip galvanized steel sheet, in order to obtain a suitable ferrite and pearlite structure in t...
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 sheet (wt.%)
[0039] Numbering
C
Si
mn
P
S
Ti
als
1
0.0016
0.05
0.12
0.008
0.004
0.011
0.029
2
0.0020
0.04
0.18
0.005
0.005
0.014
0.036
3
0.0026
0.06
0.16
0.006
0.007
0.016
0.045
[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 / ℃
Finishing temperatu...
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Property
Measurement
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Abstract
The invention belongs to the technical field of steel plate manufacturing and in particular relates to a hot galvanized steel plate and a preparation method thereof. In order to solve the problems that a hot galvanized steel plate prepared by an existing method is poor in mechanical property and stretching property and the like, the invention provides the hot galvanized steel plate and the preparation method thereof. The hot galvanized steel plate comprises the following chemical components in percentages by weight: less than or equal to 0.0030% of Cm 0.04-0.06% of Si, 0.10-0.20% of Mn, less than or equal to 0.010% of P, less than or equal to 0.008% of S, 0.010-0.020% of Ti, 0.025-0.050% of Als and the balance of Fe and inevitable impurities. The preparation method comprises the followingsteps: carrying out smelting, hot rolling, pickling rolling, hot galvanizing and annealing steps on smelted steel to prepare obtain the hot galvanized steel plate. The yield strength of the hot galvanized steel plate prepared by the invention is 180-240MPa, the tensile strength of the hot galvanized steel plate is 340-360MPa, the ductility is greater than or equal to 34.0%, n90 is greater than orequal to 0.18, r90 is greater than or equal to 1.6, BH is greater than or equal to 30MPa, and the hot galvanized steel plate is excellent in mechanical property and forming property and can meet the using demands of automotive planking users.
Description
technical field [0001] The invention belongs to the technical field of hot-dip galvanized steel sheet production, and in particular relates to a bake-hardened hot-dip galvanized steel sheet and a preparation method thereof. Background technique [0002] Baking-hardening hot-dip galvanized steel sheet is a new type of steel sheet, which is widely used in the field of automobile parts preparation. The bake-hardened hot-dip galvanized steel sheet must not only have excellent stamping performance and surface appearance quality, but also have certain anti-sag performance and bake-hardness performance to reduce noise during high-speed driving. [0003] The existing methods for producing bake-hardened hot-dip galvanized steel sheets mainly include the following: [0004] 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. T...
Claims
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