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Steel plate and galvanizing steel plate, and preparation method thereof

A technology for galvanized steel sheets and steel sheets, applied in temperature control, hot-dip galvanizing process, coating, etc., which can solve the problems of low strength and machinability of galvanized steel sheets

Active Publication Date: 2015-05-06
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, experiments have proved that the strength and workability of the above-mentioned galvanized steel sheets are still not high

Method used

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  • Steel plate and galvanizing steel plate, and preparation method thereof
  • Steel plate and galvanizing steel plate, and preparation method thereof
  • Steel plate and galvanizing steel plate, and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0017] According to the method for preparing a steel plate of the present invention, the content of various alloy elements and impurities in the steel slab can be controlled according to the standard of conventional interstitial-free steel (IF steel), for example, the content of carbon is not more than 0.006% by weight , the content of manganese is 0.15-2.5% by weight, the content of phosphorus is not more than 0.20% by weight, the content of aluminum is 0.010-0.10% by weight, the content of titanium is 0.003-0.080% by weight, and the content of niobium is 0.010-0.070% by weight, The content of iron and impurities is the balance. Wherein, the contents of various alloy elements and impurities in the billet refer to values ​​measured according to national standards. In addition, the way to achieve the required content range of various alloying elements and impurities can be realized through the conventional raw materials, equipment and operations used in the field for smelting m...

Embodiment 1

[0042] The content of carbon is 0.004% by weight, the content of manganese is 0.40% by weight, the content of phosphorus is 0.050% by weight, the content of aluminum is 0.045% by weight, the content of titanium is 0.040% by weight, the content of niobium is 0.042% by weight, iron and A steel slab (thickness 200mm) with the content of impurities as the balance (the content of impurities is not more than 0.1% by weight, wherein the content of silicon is 0.01% by weight, the content of sulfur is 0.010% by weight, and the content of nitrogen is 0.0025% by weight), in Heating in the heating furnace to 1197°C and maintaining at 1197°C for 180 minutes, the heated billet enters the rough rolling unit, the final rolling temperature of rough rolling is 1060°C, the thickness of the intermediate slab after rough rolling is 33mm, and then Enter the coreless transfer hot coil box for hot coiling. The temperature of the hot coil is 1020°C, and then the intermediate slab obtained by the hot co...

Embodiment 2

[0044] The content of carbon is 0.005% by weight, the content of manganese is 0.43% by weight, the content of phosphorus is 0.054% by weight, the content of aluminum is 0.049% by weight, the content of titanium is 0.044% by weight, the content of niobium is 0.047% by weight, iron and A steel slab (thickness 209mm) with the content of impurities as the balance (the content of impurities is not more than 0.1% by weight, wherein the content of silicon is 0.01% by weight, the content of sulfur is 0.010% by weight, and the content of nitrogen is 0.0020% by weight), in Heating in the heating furnace to 1186°C and maintaining at 1186°C for 200 minutes, the heated billet enters the rough rolling unit, the final rolling temperature of rough rolling is 1085°C, the thickness of the intermediate slab after rough rolling is 30mm, and then Enter the coreless transfer hot coil box for hot coiling, the temperature of the hot coil is 1055°C, and then finish rolling the intermediate slab obtaine...

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Abstract

The invention provides a method for preparing a steel plate. The method comprises sequentially heating, rough rolling, hot coiling, finish rolling, cooling, coiling, cold rolling and annealing a billet, wherein a finishing temperature of the finish rolling is 900 to 950 DEG C, a temperature of the coiling is 550 to 650 DEG C, the cooling comprises a first segment of cooling and a second segment of cooling, the first segment of cooling is carried out with a cooling speed of 40 to 50 DEG C / s so as to cool a temperature from the finishing temperature of the finish rolling to 750 to 800 DEG C, and the second segment of cooling is carried out with a cooling speed of 10 to 20 DEG C / s so as to cool a temperature from 750-800 to the temperature of the coiling. The invention further provides a steel plate prepared by the above method and a galvanizing steel plate. The galvanizing steel plate obtained by the invention is relatively high in strength and processability.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a method for preparing a steel plate, the steel plate prepared by the method and a galvanized steel plate. Background technique [0002] Galvanized steel sheet is one of the leading varieties of iron and steel metallurgical enterprises at home and abroad, and is an important coating product for construction and the main raw material for color-coated steel sheets for structures. Galvanized steel sheets are required to have high strength and workability to be suitable for the required occasions. [0003] CN102119235A discloses a high-strength galvanized steel sheet, which contains C: 0.0005-0.0040%, Si: 0.1-1.0%, Mn: 1.0-2.5%, P: 0.01-0.20%, S≤0.015%, Al: 0.01- 0.10%, N: 0.005-0.0070%, Ti: 0.010-0.080%, B: 0.005-0.0020%, Cu: 0.05-0.50%, Ni: 0.03-0.50%, the rest is composed of Fe and unavoidable impurities; its preparation The method is: heating the steel slab with the abo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/14C23C2/40C23C2/06B21B37/74
Inventor 王敏莉郑之旺梁英肖利刘勇翁建军张功庭
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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