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800 MPa grade single side-electrogalvanized phase-change induced plastic steel sheet and preparation method thereof

A phase change induced plasticity, 800mpa technology, applied in the field of electroplated steel plate processing, can solve the problems of lack of production capacity, etc., and achieve the effect of easy realization of process parameters, good surface quality, and simple production control

Inactive Publication Date: 2019-06-14
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

800MPa grade single-sided galvanized phase change induced plasticity steel exceeds 11,000 yuan / ton, which is more than 4,000 yuan higher than other steel types of the same level, and domestic steel companies do not yet have production capacity and can only rely on foreign imports

Method used

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  • 800 MPa grade single side-electrogalvanized phase-change induced plastic steel sheet and preparation method thereof
  • 800 MPa grade single side-electrogalvanized phase-change induced plastic steel sheet and preparation method thereof
  • 800 MPa grade single side-electrogalvanized phase-change induced plastic steel sheet and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0023] A method for preparing an 800MPa grade single-sided galvanized phase transition-induced plastic steel plate of the present invention comprises:

[0024] Steel strips are obtained after pretreatment, converter smelting, external refining, continuous casting, hot-rolled slab heating, hot rolling, laminar cooling, first coiling, pickling, cold rolling, and continuous annealing; The strip steel after continuous annealing is electro-galvanized on one side;

[0025] When conducting single-sided electrogalvanizing treatment, the non-galvanized side of the strip is coated with acid-resistant substances in advance, and the liquid level of the electroplating solution is controlled at the center line of the strip; then the upper and lower anodes are controlled by controlling the anode switch. One of the anodes is energized and the other anode is not.

[0026] Single-side electrogalvanizing treatment specifically includes: uncoiling, welding, alkali spray cleaning, electrolytic de...

Embodiment 1

[0034] In this example, the 800MPa grade single-sided galvanized phase transformation induced plastic steel sheet has the chemical composition and weight percentages of C: 0.20%, Si: 1.21%, Mn: 1.86%, Nb: 0.030%, P≤0.20%, S ≤0.03%, Al≤0.50%, the balance is Fe and unavoidable impurities.

[0035] The method includes the following technological process: molten iron pretreatment→converter smelting→extra-furnace refining→continuous casting→hot-rolled slab heating→hot rolling→laminar cooling→primary coiling→pickling→cold rolling→continuous annealing→single Surface galvanizing → functional inspection → packing and leaving the factory. Among them, the heating temperature of the hot-rolled slab is 1220°C, the rolling start temperature is 1110°C, the final rolling temperature is 900°C, laminar cooling is adopted after rolling, the cooling rate is 20°C / s, and the coiling temperature is 550°C. Cold rolling uses a reduction ratio of 52%. The continuous annealing heating temperature is 8...

Embodiment 2

[0041] In this embodiment, the 800MPa level single-sided galvanized phase transformation induced plastic steel sheet contains by weight percentage, its chemical composition and weight percentage are C: 0.19%, Si: 1.25%, Mn: 1.82%, Nb: 0.026%, P≤ 0.20%, S≤0.03%, Al≤0.50%, and the balance is Fe and unavoidable impurities.

[0042] The method includes the following technological process: molten iron pretreatment→converter smelting→extra-furnace refining→continuous casting→hot-rolled slab heating→hot rolling→laminar cooling→primary coiling→pickling→cold rolling→continuous annealing→single Surface galvanizing → functional inspection → packing and leaving the factory. Among them, the heating temperature of the hot-rolled slab is 1250°C, the rolling start temperature is 1120°C, the final rolling temperature is 930°C, laminar cooling is adopted after rolling, the cooling rate is 30°C / s, and the coiling temperature is 570°C. Cold rolling uses a reduction ratio of 53%. The continuous ...

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Abstract

The invention discloses an 800 MPa grade single side-electrogalvanized phase-change induced plastic steel sheet and a preparation method thereof. The steel sheet comprises strip steel and an electrogalvanized layer formed on one surface of the strip steel, and the thickness of the electrogalvanized layer is 70-90 g / m<2>; and the strip steel comprises the following chemical components of, in percentage by weight, 0.12-0.24% of C, 0.80-1.80% of Si, 1.20-2.50% of Mn, 0.01-0.06% of Nb, less than or equal to 0.20% of P, less than or equal to 0.03% of S, less than or equal to 0.50% of Al, and the balance Fe and inevitable impurities. The steel sheet is better in surface quality and has excellent comprehensive mechanical properties of high strength and high plasticity.

Description

technical field [0001] The invention belongs to the technical field of electroplated steel plate processing, and relates to an 800MPa single-sided electrogalvanized phase-change-induced plastic steel plate and a preparation method thereof. Background technique [0002] In recent years, the demand for high-strength steel in the automotive industry has been increasing. The steel plates used to make automobile bodies need to have corrosion resistance and excellent weldability at the same time. The ordinary continuously annealed steel plate has good welding performance because it is a bare plate, but its corrosion resistance is poor, and it needs to be processed by the subsequent processing parts factory before it can be used, and the amount of cold-rolled steel plate is decreasing year by year. Hot-dip galvanizing has been used more and more in recent years because it can improve the corrosion resistance of steel plates. However, after the steel plate enters the zinc pot, a zin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12B21C37/02C21D8/02C22C33/04C25D3/22C25D7/06
Inventor 李春诚黄健刘宏亮高洪刚薛文辉程宏远冯岗
Owner BENGANG STEEL PLATES
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