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1000mpa-level dual-phase high-strength galvanized strip steel and steel plate and preparation method

A strip steel, high-strength technology, applied in the field of iron and steel smelting, can solve the problems of reduced adhesion and leakage of zinc layer, and achieve the effects of slowing down the precipitation of grain boundary carbides, improving wettability, and controlling stability.

Active Publication Date: 2019-05-28
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the production process of high-strength galvanized steel strip and steel plate, due to the addition of a large amount of Mn and Si elements, during the annealing process, Mn and Si elements are enriched to the surface to form oxides. The enrichment on the surface of the steel plate will reduce the adhesion between the surface of the strip steel and the steel plate and pure zinc, and even cause the missing plating of the zinc layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] For 1000MPa grade dual-phase high-strength galvanized strip steel and steel plate, the chemical composition and mass percentage of the substrate are shown in Table 1, and the mechanical properties are shown in Table 2.

[0021] The production method includes heating, hot rolling, cold rolling, continuous galvanizing, smoothing and passivation processes, and the specific steps are as follows:

[0022] 1) Heating process: The continuous casting billet is heated by a stepping heating furnace. The soaking temperature of the heating section of the continuous casting billet is 1280℃, and the total heating time is 120min.

[0023] 2) Hot rolling process: the finishing rolling temperature is 880°C, and the coiling temperature is 680°C.

[0024] 3) Cold rolling process: cold rolling reduction rate is 50%.

[0025] 4) Continuous galvanizing process: soaking temperature is 795°C, first slow cooling to 710°C, then fast cooling to 445°C; galvanizing temperature (zinc liquid tempera...

Embodiment 2

[0029] For 1000MPa grade dual-phase high-strength galvanized strip steel and steel plate, the chemical composition and mass percentage of the substrate are shown in Table 1, and the mechanical properties are shown in Table 2.

[0030] The production method includes heating, hot rolling, cold rolling, continuous galvanizing, smoothing and passivation processes, and the specific steps are as follows:

[0031] 1) Heating process: The continuous casting billet is heated by a stepping heating furnace, the soaking temperature of the heating section of the continuous casting billet is 1350℃, and the total heating time is 140min.

[0032] 2) Hot rolling process: the finishing rolling temperature is 875°C, and the coiling temperature is 690°C.

[0033] 3) Cold rolling process: cold rolling reduction rate is 55%.

[0034] 4) Continuous galvanizing process: soaking temperature is 770°C, first slow cooling to 700°C, then fast cooling to 420°C; galvanizing temperature (zinc liquid tempera...

Embodiment 3

[0038] For 1000MPa grade dual-phase high-strength galvanized strip steel and steel plate, the chemical composition and mass percentage of the substrate are shown in Table 1, and the mechanical properties are shown in Table 2.

[0039] The production method includes heating, hot rolling, cold rolling, continuous galvanizing, smoothing and passivation processes, and the specific steps are as follows:

[0040] 1) Heating process: The continuous casting billet is heated by a walking furnace, the soaking temperature of the heating section of the continuous casting billet is 1250℃, and the total heating time is 100min.

[0041]2) Hot rolling process: the finishing rolling temperature is 905℃, and the coiling temperature is 620℃.

[0042] 3) Cold rolling process: cold rolling reduction rate is 50%.

[0043] 4) Continuous galvanizing process: soaking temperature is 840°C, first slow cooling to 740°C, then fast cooling to 450°C; galvanizing temperature (zinc liquid temperature) 460°C;...

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Abstract

The invention discloses 1000 MPa-grade biphase high-strength galvanize strip steel, a steel sheet and a preparation method. The strip steel and a steel sheet base sheet include ingredients of, by mass content, 0.06-0.15% of C, 2.2-2.8% of Mn, 0.45-0.65% of Si, 0.40-0.60% of Cr, less than or equal to 0.012% of P, less than or equal to 0.002% of S, 0.020-0.070% of Als, 0.010-0.030% of Ti, 0.15-0.30% of Mo and the balance Fe and impurities which cannot be removed. The preparation method includes the steps of heating, hot rolling, cold rolling, continuous galvanizing, finishing and passivating. New ingredient design is adopted, production difficulty is greatly lowered by controlling process parameters of all processes, and the yield of a finished product is raised. The finished product has the characteristics of good forming performance, mechanical performance, corrosion resistance performance and the like, and the strength of extension reaches 1000 MPa or above.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and particularly relates to a 1000 MPa grade dual-phase high-strength galvanized strip steel and a steel plate and a preparation method. Background technique [0002] In recent years, in order to meet the needs of automobile weight reduction, energy saving, environmental protection and safety, advanced high-strength steels such as dual-phase steels have attracted more and more attention from scholars from all over the world. Due to its low yield strength, high tensile strength, low yield-to-tensile ratio, obvious work hardening, high elongation after fracture, easy stamping and forming, and good plasticity and toughness matching, dual-phase steel has gradually become an important material for automobile manufacturing. [0003] The microstructure of DP series high-strength steel galvanized automotive sheet products is composed of ferrite and martensite, and the martensite structure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/02C22C38/06C22C38/28C22C38/22C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0236C21D2211/005C21D2211/008C22C38/002C22C38/02C22C38/06C22C38/22C22C38/28C22C38/38
Inventor 刘靖宝杜明山夏明生冯晓勇王鹏路博勋刘丽萍宋海武臧振东
Owner TANGSHAN IRON & STEEL GROUP
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