High-strength hot-dip galvanized stamping car structure steel plate and production method thereof
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A technology of automobile structure and production method, which is applied in the field of metallurgy and achieves the effects of strong anti-powdering ability, strong anti-powdering ability and no lugs of the coating.
Inactive Publication Date: 2020-06-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology
[0006] The technical problems to be solved by the present invention are: existing problems in the production of high-strength hot-dip galvanized stamping automobile structural steel sheets, such as coating resistance to pulverization, strong directionality of mechanical properties, and secondary processing brittleness after forming.
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Embodiment 1
[0054] Example 1 Preparation of high-strength hot-dip galvanized stamping automobile structural steel plate by the method of the present invention
[0055] Specific steps are as follows:
[0056] a. Molten steel smelting: The smelting equipment is top-blown converter. The semi-steel after vanadium extraction from blast furnace hot metal is used as raw material. The temperature is 1364°C. Steelmaking auxiliary materials are added to smelt to 1670°C to tap the steel to the molten steel tank. When tapping 1 / 3, add 1300Kg The medium-carbon ferromanganese alloy (Dechang Ferroalloy Co., Ltd.) is pre-deoxidized, and then the molten steel tank is treated with bottom blowing argon on a small platform outside the furnace. The argon pressure is 290Pa and the time is 5 minutes.
[0057] b. LF electric heating: argon gas with a certain pressure of 300Pa is injected into the bottom of the molten steel tank for 5 minutes.
[0058] c. RH vacuum refining: final deoxidation, alloying, and comp...
Embodiment 2
[0064] Example 2 Preparation of high-strength hot-dip galvanized stamping automobile structural steel plate by the method of the present invention
[0065] Specific steps are as follows:
[0066]The production method is basically the same as in Example 1, except that the composition of molten steel obtained by converter smelting is C: 0.0030, Si: 0.13, Mn: 0.68, Nb: 0.034, Ti: 0.040, N: 0.0028, P: 0.070, S: 0.004 , B: 0.0010, Als: 0.052, and the rest is Fe, (Wt,%). The hot-rolled steel plate produced with the aforementioned molten steel has a slab exit temperature of 1230°C, a finish rolling temperature of 928°C, a coiling temperature of 710°C, a hot-rolled thickness of 4.10mm, an acid-rolled thickness of 1.4mm, and a hot-dip galvanizing annealing temperature of 835°C. The end temperature of slow cooling is 610°C, the temperature of hot-dip galvanizing is 460°C, the final cooling temperature of the secondary cooling section is 90°C, and the flat elongation is 0.8%.
[0067] ...
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a high-strength hot-dip galvanized stamping car structure steel plate and a production method thereof. In view of the problems such as high mechanical property directionality and secondary processing brittleness after forming of an car structure steel plate prepared by an existing method, the steel plate is provided by the invention and is prepared from the chemical components in percentage by weight: less than or equal to 0.0040% of C, 0.10-0.15% of Si, 0.60-0.70% of Mn, 0.030-0.040 of Nb, 0.040-0.050% ofTi, 0.002-0.006% of N, 0.060-0.075% of P, 0-0.012% of S, 0.0005-0.0015% of B, 0.020-0.060% of Als, and the balance of Fe and inevitable impurities. The invention further provides the production methodof the steel plate. Relevant parameters such as the coiling temperature and the cooling speed are precisely controlled, the mechanical properties of the obtained steel plate are stable jointly, anisotropy is small, a coating is good in adhesion, the convex lug phenomenon is basically avoided after forming, the problem of secondary processing brittleness after forming is solved, and using and popularization prospects are good.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a high-strength hot-dip galvanized stamping automobile structural steel plate and a production method thereof. Background technique [0002] my country's automobile industry has entered a period of rapid development of passenger cars. In order to meet the needs of "weight reduction, energy saving, safety, and environmental protection" in the automobile manufacturing industry, more and more high-strength hot-dip galvanized steel sheets are used in passenger car parts. Due to the excellent solid-solution strengthening effect and economy of phosphorus, the high-strength IF hot-dip galvanized steel developed on the basis of ultra-low carbon steel (that is, high-strength hot-dip galvanized steel without interstitial atoms) has both high strength and very good Stamping formability and corrosion resistance, usually used to make complex parts that require deep drawing, have been widel...
Claims
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Application Information
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