Continuously hot-galvanized high-strength steel and production method thereof

A production method, hot-dip galvanizing technology, applied in the field of steel rolling, can solve problems such as poor plasticity, waste of energy and materials, and increase cumbersome procedures, and achieve the effect of improving strength and plasticity

Inactive Publication Date: 2015-06-24
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unrecrystallized structure has undergone great deformation and has poor plasticity, which seriously affects the product quality
On the other hand, in the continuous hot-dip galvanizing production process, conventional products are fully recrystallized and annealed, and the annealing temperature is between 700 and 850°C. A large number of transitions are required to gradually reduce the temperature to reach the temperature of S550GD+Z control requirements, resulting in greater waste of energy and materials, and increased more cumbersome procedures

Method used

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  • Continuously hot-galvanized high-strength steel and production method thereof
  • Continuously hot-galvanized high-strength steel and production method thereof
  • Continuously hot-galvanized high-strength steel and production method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] See Table 1, the chemical composition of steel by mass percentage is: C 0.07%, Mn 1.4%, Si 0.15%, P 0.009%, S 0.012%, Al 0.045%, Ti 0.07%, the balance is Fe and unavoidable impurities .

[0021] See Table 2. In the hot rolling process, the heating temperature is 1250°C, the finish rolling temperature is 850°C, and the coiling temperature is 640°C. In the cold rolling process, the cold rolling reduction is 55%, the annealing temperature is 780°C, and the skin elongation is 0.5%.

[0022] Referring to Table 3, the mechanical properties of the S550GD+Z steel produced by the production method of the hot-dip galvanized high-strength steel S550GD+Z provided by the embodiment of the present invention are as follows: the yield strength is 630MPa, the tensile strength is 760MPa, and the elongation is 16.0%. It has high plasticity and meets industrial requirements.

Embodiment 2

[0024] See Table 1, the chemical composition of steel by mass percentage is: C 0.12%, Mn 0.65%, Si 0.13%, P 0.009%, S 0.012%, Al 0.045%, Ti 0.10%, the balance is Fe and unavoidable impurities .

[0025] See Table 2. In the hot rolling process, the heating temperature is 1280°C, the finish rolling temperature is 840°C, and the coiling temperature is 680°C. In the cold rolling process, the cold rolling reduction is 65%, the annealing temperature is 780°C, and the skin elongation is 0.5%.

[0026] Referring to Table 3, the mechanical properties of the S550GD+Z steel produced by the production method of the hot-dip galvanized high-strength steel S550GD+Z provided by the embodiment of the present invention are as follows: the yield strength is 680MPa, the tensile strength is 790MPa, and the elongation is 15.5%. It has high plasticity and meets industrial requirements.

Embodiment 3

[0028] See Table 1, the chemical composition of steel by mass percentage is: C 0.08%, Mn 0.80%, Si 0.15%, P 0.009%, S 0.012%, Al 0.045%, Ti 0.05%, the balance is Fe and unavoidable impurities .

[0029] See Table 2. In the hot rolling process, the heating temperature is 1230°C, the final rolling temperature is 820°C, and the coiling temperature is 640°C. In the cold rolling process, the cold rolling reduction is 45%, the annealing temperature is 730°C, and the skin elongation is 0.5%.

[0030] Referring to Table 3, the mechanical properties of the S550GD+Z steel produced by the production method of the hot-dip galvanized high-strength steel S550GD+Z provided by the embodiment of the present invention are as follows: the yield strength is 570MPa, the tensile strength is 682MPa, and the elongation is 17.5%. It has high plasticity and meets industrial requirements.

[0031]

[0032]

[0033] Table 1

[0034]

[0035] Table 2

[0036]

[0037] table 3

[0038] ...

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Abstract

The invention relates to the technical field of steel rolling, and particularly relates to continuously hot-galvanized high-strength steel and a production method thereof. The high-strength steel comprises the following chemical components in percentage by mass: 0.05-0.15% of C, 0.6-1.5% of Mn, 0.10-0.50% of Si, less than or equal to 0.015% of P, less than or equal to 0.018% of S, 0.03-0.07% of Als, 0.05-0.10% of Ti, and the balance of Fe and unavoidable impurities. The invention also provides the production method of the hot-galvanized high-strength steel S550GD + Z. The production method comprises the steps of steelmaking, hot rolling, cold rolling, continuous hot galvanizing, and finishing. According to the production method of the continuously hot-galvanized high-strength steel provided by the invention, a required strength is achieved through controlling the components, the coiling temperature, the soaking temperature of continuous hot galvanizing, and the ductility of a finishing machine. The method greatly increases the plasticity of finished products, and avoids resource wasting caused by temperature transition arising from low-temperature annealing in a conventional continuous hot galvanizing production method.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a continuous hot-dip galvanized high-strength steel and a production method thereof. Background technique [0002] Continuous hot-dip galvanized high-strength steel S550GD+Z (hereinafter referred to as S550GD+Z) is a commonly used high-strength structural steel. In the prior art, S550GD+Z is mainly produced by continuous hot-dip galvanizing. S550GD+Z has high strength and good corrosion resistance, and is widely used in light steel structure floor decks, ship shelf bases and ship pedals and other fields. The national standard GB / T 2518-2004 requires the composition of S550GD+Z to be C≤0.25%, Mn≤1.70%, P≤0.20%, S≤0.35%; the performance requirements of S550GD+Z are Re≥550MPa, Rm≥560MPa . [0003] S550GD+Z usually uses ordinary low-carbon aluminum-killed steel as raw material, and is produced by incomplete annealing method. The characteristics of this method are: generally a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/02C23C2/06
Inventor 刘再旺赵运堂赵虎代乐乐李晓林刘武华齐达刘大滔杨利斌
Owner SHOUGANG CORPORATION
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