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Production method of 460MPa grade high-surface quality structural hot dipped galvanized steel plate and its product

A technology of hot-dip galvanized steel sheet and production method, which is applied in the direction of hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems that the surface quality is difficult to guarantee, the elongation of the steel plate is low, etc., and achieve excellent surface quality, good Adhesion performance of zinc layer, effect of improving strength

Inactive Publication Date: 2012-11-21
MAGANG (GROUP) HOLDING CO LTD +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Judging from the situation provided by the invention, since the hot-rolled sheet is directly pickled and galvanized, the surface quality is difficult to guarantee
[0006] These two inventions can meet the requirements of galvanized sheets for general construction, but for high-strength hot-dip galvanized steel sheets for exposed parts with higher requirements, the surface quality is difficult to guarantee; ordinary C-Mn steel will have adverse effects on surface quality, and steel sheets elongation is also low

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  • Production method of 460MPa grade high-surface quality structural hot dipped galvanized steel plate and its product
  • Production method of 460MPa grade high-surface quality structural hot dipped galvanized steel plate and its product
  • Production method of 460MPa grade high-surface quality structural hot dipped galvanized steel plate and its product

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Embodiment Construction

[0028] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0029] A method for producing hot-dip galvanized steel sheets for high-strength structures strengthened by microalloying. The galvanized steel sheets for structures produced by this method have a yield strength of 390-480MPa, a tensile strength of 460MPa-560MPa, and an elongation of 20%. ~30%, etc., the surface quality is excellent, and it is widely used in the construction field with high deformation requirements.

[0030] The main chemical composition weight percent of the hot-dip galvanized steel sheet is: C: 0.040%~0.10%; Si: ≤0.060%; Mn: 0.60%~0.80%; P: ≤0.035%; S: ≤0.035%; Al: 0.020%~0.060%; Nb+Ti:≤0.080%.

[0031] For realizing the manufacture of steel of the present invention, technological process and technological content are as follows:

[0032] (1) Converter: Tapping for de...

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Abstract

The invention relates to a 460MPa grade high-surface quality structural hot dipped galvanized steel plate and its production method. The method consists of steps of: conducting continuous casting on molten steel; carrying out hot continuous rolling on a steel billet; performing cold rolling on the steel billet subjected to hot continuous rolling; implementing continuous annealing; and conducting galvanizing, thus obtaining the galvanized plate. The hot dipped galvanized steel plate comprises, by mass: 0.040%-0.10% of C; less than or equal to 0.060% of Si; 0.60%-0.80% of Mn; less than or equal to 0.035% of P; less than or equal to 0.035% of S; 0.020%-0.060% of Al; less than or equal to 0.080% of Nb and Ti; and the balance Fe.

Description

technical field [0001] The invention relates to the field of continuous hot-dip galvanized steel sheets, in particular to a hot-dip galvanized steel sheet for 460MPa-level high surface quality structures and a production method. 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, etc. according to the grade of yield strength. Because they are used in the construction industry, the surface quality of the steel sheets is generally not high, and the common process design is Use C, Si, Mn elements to strengthen, because increasing the C element will accelerate the growth rate of the ζ phase in the alloy layer, resulting in a decrease in the plasticity and adhesion of the coating, and increasing the content of Si and Mn elements will aggravate the selective oxidation and reduce the adhesion of the coating. Therefore, increasing the content o...

Claims

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Application Information

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IPC IPC(8): C22C38/14B21B37/74C21D1/26C23C2/06
Inventor 赵云龙杨兴亮杨平崔磊翁林山张建张翠
Owner MAGANG (GROUP) HOLDING CO LTD
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