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High-strength continuous annealing cold rolling stamping automobile structural steel plate and production method thereof

A technology of automobile structure and production method, which is applied in the field of metallurgy, can solve problems such as strong directionality of mechanical properties, and achieve the effects of excellent comprehensive performance, no lugs, and small difference in plane anisotropy

Inactive Publication Date: 2020-06-02
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: the problems of strong directionality of mechanical properties and brittleness of secondary processing after forming in the existing production of automotive structural steel plates for continuous annealing and cold rolling stamping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1 Preparation of high-strength continuous annealing cold-rolled stamping automobile structural steel plate by the method of the present invention

[0057] The specific operation steps are as follows:

[0058] a. Molten steel smelting: The smelting equipment is top-blown converter, the semi-steel after vanadium extraction from blast furnace molten iron is used as raw material, the temperature is 1366°C, steelmaking auxiliary materials are added and smelted to 1675°C to tap the molten steel tank, and 1 / 3 of the steel is tapped when adding 1300Kg Medium-carbon ferromanganese alloy (Dechang Ferroalloy Co., Ltd.) is pre-deoxidized, and then the molten steel tank is treated with bottom-blown argon on a small platform outside the furnace. The argon pressure is 280Pa and the time is 5 minutes.

[0059] b. LF electric heating: argon gas with a certain pressure of 310Pa is injected into the bottom of the molten steel tank for 5 minutes.

[0060] c. RH vacuum refining: fi...

Embodiment 2

[0066] Example 2 Using the method of the present invention to prepare high-strength continuous annealing cold-rolled stamping automotive structural steel sheets

[0067] The specific operation steps are as follows:

[0068]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: 0.23%, Mn: 0.95%, Nb: 0.033%, Ti: 0.042%, N: 0.0028%, P : 0.093%, S: 0.004%, B: 0.0009%, Als: 0.045%, and the rest are Fe and unavoidable impurities. The hot-rolled steel plate produced with the aforementioned molten steel has a slab exit temperature of 1228°C, a finish rolling temperature of 925°C, a coiling temperature of 715°C, a hot-rolled thickness of 4.10mm, an acid-rolled thickness of 1.4mm, an annealing temperature of 830°C, and a primary cooling section The temperature is 620°C, the temperature of the over-aging section (OAS section) is 410°C, the final cooling temperature of the secondary coolin...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a high-strength continuous annealing cold rolling stamping automobile structural steel plate and a production method thereof. Aiming at the problems of high mechanical property directionality of the automobile structural steel plate prepared by a prior method, secondary machining brittleness after forming and the like, the steel plate is provided, and the steel plate is prepared from the chemical compositions in percentage by weight: less than or equal to 0.0040% of C, 0.20-0.30% of Si, 0.80-1.00% of Mn, 0.020-0.040% of Nb, 0.030-0.050% of Ti, 0.002-0.006% of N, 0.080-0.110% of P, 0-0.015% of S, 0.0005-0.0015% of B, 0.015-0.050% of Als and the balance of Fe and inevitable impurities. The invention further provides the production method of the steel plate, the coiling temperature, cooling speed and other relevant parameters are accurately controlled, so that the mechanical properties of the steel plate are stable, the anisotropy is small, basically no lug phenomenon occurs, the problem of the secondary machining brittleness after forming is solved, and the promotion and application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength continuous annealing cold-rolled stamping automotive 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 thin steel plates are used in auto parts. Due to the excellent solid-solution strengthening effect and economy of phosphorus, the ultra-low carbon phosphorus-containing cold-rolled high-strength steel developed on the basis of ultra-low carbon steel (that is, interstitial-free high-strength cold-rolled steel plate) has both high strength and very Good stamping formability, often used to make complex parts that require deep drawing, has been widely used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21D1/26C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
CPCC21D1/26C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/06C22C38/001C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 刘庆春张功庭郑之旺余灿生
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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