Hot galvanizing steel plate with yield strength more than or equal to 550MPa, and manufacturing method thereof

A technology of hot-dip galvanized steel sheet and yield strength, which is applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of high production cost and high content, so as to improve strength, reduce cost, and reduce grain size. effect of particle size

Active Publication Date: 2012-11-28
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the content disclosed in the patent text, the chemical composition of the hot-dip galvanized steel sheet has a relatively high content of Nb and Ti microalloying elements, and the production cost is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The composition ratio of hot-dip galvanized steel sheet is calculated by mass percentage: C: 0.07%, Si: 0.03%, Mn: 0.84%, Als: 0.035%, P: 0.02%, S: 0.02%, and the balance is Fe and not Impurities to avoid;

[0020] The manufacturing process of the hot-dip galvanized steel sheet is: molten iron pretreatment—converter smelting—argon station—smelting furnace refining—steel CSP continuous casting and rolling—steel pickling and cold rolling—steel continuous galvanizing—finished product;

[0021] Process parameters: Steel plate CSP hot rolling initial rolling temperature is 1150°C, final rolling temperature is 850°C, coiling temperature is 560°C; steel plate pickling and cold rolling reduction rate is 60%; steel plate galvanizing continuous annealing temperature is 565°C, furnace The hydrogen content in the zinc pot is greater than 20%, and the annealing speed is 65m / min; the steel plate temperature is 450°C when the steel plate enters the plating bath, the plating bath tempe...

Embodiment 2

[0024] The composition ratio of hot-dip galvanized steel sheet is calculated by mass percentage: C: 0.10%, Si: 0.03%, Mn: 0.80%, Als: 0.020%, P: 0.01%, S: 0.015%, and the balance is Fe and not Impurities to avoid;

[0025] The manufacturing process of the hot-dip galvanized steel sheet is: molten iron pretreatment—converter smelting—argon station—smelting furnace refining—steel CSP continuous casting and rolling—steel pickling and cold rolling—steel continuous galvanizing—finished product;

[0026] Steel plate CSP hot rolling initial rolling temperature is 1130 °C, final rolling temperature is 860 °C, coiling temperature is 550 °C; steel plate pickling cold rolling reduction rate is 70%; steel plate galvanizing continuous annealing temperature is 545 °C, and the hydrogen content in the furnace is 40 %, the annealing speed is that the steel plate line speed is 75m / min; the steel plate temperature is 450°C when the steel plate enters the plating bath, the plating bath temperatur...

Embodiment 3

[0029] The composition ratio of hot-dip galvanized steel sheet is calculated by mass percentage: C: 0.12%, Si: 0.02%, Mn: 0.71%, Als: 0.060%, P: 0.015%, S: 0.025%, and the balance is Fe and not Impurities to avoid;

[0030] The manufacturing process of the hot-dip galvanized steel sheet is: molten iron pretreatment—converter smelting—argon station—smelting furnace refining—steel CSP continuous casting and rolling—steel pickling and cold rolling—steel continuous galvanizing—finished product;

[0031] The steel plate CSP hot rolling heating temperature is 1110°C, the final rolling temperature is 880°C, and the coiling temperature is 540°C; the steel plate pickling cold rolling reduction rate is 80%; the steel plate galvanizing continuous annealing temperature is 530°C, and the hydrogen content in the furnace is 35%. The annealing speed is that the line speed of the steel plate is 80m / min; the temperature of the steel plate is 460°C when the steel plate enters the plating bath, t...

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Abstract

The invention discloses a hot galvanizing steel plate with yield strength more than or equal to 550MPa, and a manufacturing method of the hot galvanizing steel plate; the hot galvanizing steel plate with the yield strength more than or equal to 550MPa comprises the following components by mass percent: 0.05-0.12% of C, less than or equal to 0.08% of Si, 0.3-0.9% of Mn, 0.020-0.060% of Als, less than or equal to 0.03% of P, less than or equal to 0.03% of S and the balance of Fe and unavoidable impurities; the manufacturing method of the hot galvanizing steel plate with the yield strength more than or equal to 550MPa comprises the steps of cast steel plate (CSP) continuous casting and rolling, steel plate pickling cold rolling and steel plate continuous zinc coating; according to the invention, the chemical components of the hot galvanizing steel plate are designed in an optimal way, alloying elements with high price are not added into the hot galvanizing steel plate, the strength of products can be improved by structure strengthening and solution strengthening of C and Mn, and the production cost is greatly reduced; the grain size is reduced, and the product strength is improved by reducing the CSP rolling temperature; the product strength is improved by controlling the acid rolling reduction rate; and the yield strength of the products can be guaranteed by controlling the galvanized annealing temperature and speed as well as the hydrogen content.

Description

technical field [0001] The invention relates to the field of hot-dip galvanized steel sheet manufacturing, in particular to a hot-dip galvanized steel sheet for high-strength structures with yield strength ≥ 550 MPa and a manufacturing method thereof. Background technique [0002] High-strength hot-dip galvanized steel sheets for structures are mainly used in the construction industry. They are generally divided into S280GD, S320GD, S350GD, S550GD, etc. according to the grade of yield strength. On the basis of Mn steel, microalloying elements such as Nb, V, and Ti are added, and the strength is improved by strengthening methods such as fine grain strengthening and precipitation strengthening. From the perspective of cost, the cost is relatively high. [0003] The publication number is CN101956126A, and the publication date is January 26, 2011. The invention patent named "a cold-based high-strength galvanized steel sheet and its production method" introduces the production of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C23C2/06C23C2/40C21D8/02
Inventor ZHAO YUNLONGZHANG YIFANYANG XINGLIANGLIU JIECUI LEIZHANG JIANGUAN CHANGLINSUN LINLIU MAOLIN
Owner MAGANG (GROUP) HOLDING CO LTD
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