Hot-dip galvanized 420MPa-grade low-alloy high-strength steel for automobile and production method thereof

A hot-dip galvanizing and low-alloy technology, which is applied in the field of metallurgical plate production, can solve the problems of unmentioned steel plate microstructure and grain size, poor corrosion resistance, long production cycle, etc., and achieve obvious advantages in product development and corrosion resistance Good performance and short production cycle

Active Publication Date: 2021-04-30
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

First of all, the document is bell furnace annealing. Bell furnace annealing is limited to the production of soft steel plates, and it is intermittent production, with long production cycle and low efficiency, which is suitable for small batch production; secondly, the document is cold-rolled products, and the products are corrosion-resistant Poor sex
Finally, the document does not mention the microstructure and grain size of the steel plate, etc.

Method used

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  • Hot-dip galvanized 420MPa-grade low-alloy high-strength steel for automobile and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Desulfurization pretreatment is carried out on the molten iron, the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel, argon is blown throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1645°C. Then, the molten steel after converter smelting is subjected to LF external refining, and the in-place temperature of refining is ≥1562°C. The LF external refining is subjected to temperature measurement and composition fine-tuning. The chemical composition of the LF external refining casting machine is shown in Table 1. The slab continuous casting superheat degree is 26°C, after which the slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The heating temperature of the slab is 1236° C., and the heating time is 230 minutes. The heated slab is subjected to high-pressure water dephosphorization. T...

Embodiment 2

[0028] Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. The converter smelting process is blown with argon, and scrap steel is added to the converter, and the tapping temperature of the converter is 1650°C. Then, the molten steel after converter smelting is subjected to LF external refining, and the in-place temperature of refining is ≥1565°C. The LF external refining is subjected to temperature measurement and composition fine-tuning. The chemical composition of the LF external refining casting machine is shown in Table 1. The slab continuous casting superheat is 23°C, after which the slab cleaning, slow cooling and continuous casting slab quality inspection are carried out. The heating temperature of the slab is 1232° C., and the heating time is 235 minutes. The heated slab is subjected to high-pressure water dephosphorization. The w...

Embodiment 3

[0030] Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Argon is blown throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1656°C. Then, the molten steel after converter smelting is subjected to LF external refining. The temperature of refining in place is ≥1561°C. The LF external refining is subjected to temperature measurement and composition fine-tuning. The chemical composition of the LF external refining casting machine is shown in Table 1. The slab continuous casting superheat is 20°C, after which the slab cleaning, slow cooling and quality inspection of the continuous casting slab are carried out. The heating temperature of the slab is 1225° C., and the heating time is 225 minutes. The heated slab is subjected to high-pressure water dephosphorization. ...

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Abstract

The invention discloses hot-dip galvanized 420MPa-grade low-alloy high-strength steel for an automobile and a production method thereof. The hot-dip galvanized 420MPa-grade low-alloy high-strength steel for the automobile comprises the following chemical components in percentage by mass: 0.06-0.08% of C, less than or equal to 0.04% of Si, 1.15-1.25% of Mn, less than or equal to 0.018% of P, less than or equal to 0.005% of S, 0.020-0.050% of Alt, 0.040-0.055% of Nb, 0.020-0.030% of Ti, 0.0010-0.0030% of Ca and the balance Fe and inevitable impurities. The high-strength steel meets the conditions that the yield strength is greater than or equal to 449MPa and less than or equal to 520MPa and the yield ratio is greater than or equal to 0.90, has relatively high strength and yield ratio and can meet the requirements of the automobile industry on weight reduction, safety, energy conservation, environmental friendliness, corrosion resistance and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgical plate production, and in particular relates to a hot-dip galvanized 420MPa low-alloy high-strength steel for automobiles and a production method thereof. Background technique [0002] With the continuous development of the automobile industry, high strength, light weight, low emission, and high safety performance have become the development direction of the automobile industry. In order to reduce the weight and cost, automobile manufacturers usually use thin-gauge high-strength steel plates for automobile structural parts . The use of low-alloy high-strength steel (HSLA steel) can not only reduce the weight of the car but also improve the safety of the car. It is more and more widely used as the internal structure of the car. Hot-dip galvanized low-alloy high-strength steel for automobiles has comprehensive properties such as high yield strength and yield strength ratio, excellent deformati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C22C33/04C21D1/26C21D8/02C21D9/573C23C2/06C23C2/40
CPCC22C38/14C22C38/12C22C38/06C22C38/04C22C33/04C22C38/002C21D1/26C21D8/0226C21D8/0236C21D9/5732C23C2/06C23C2/40
Inventor 李鹏王少炳黄利杨雄惠鑫卢晓禹白海瑞
Owner BAOTOU IRON & STEEL GRP
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