Preparation method for high-performance stamping cold-rolled and galvanized steel strip

A galvanized steel strip, high-performance technology, applied in hot-dip plating process, coating, metal material coating process, etc., can solve the problems of low profit margin, high production cost and no profit of stamping-grade galvanized products, Achieve the uniformity of product structure, good mechanical properties, and prevent the effect of excessive rolling mill load

Inactive Publication Date: 2015-09-30
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the stamping performance of the stamping-grade galvanized products produced in this way meets the requirements of users, the high alloy cost and production cost cause the profit margins of stamping-grade galvanized products to be low, and there is almost no profit.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The preparation method of the high-performance stamping-grade cold-rolled galvanized steel strip adopts the following specific processes.

[0015] Slab (billet) chemical composition (wt): C 0.01%, Mn 0.18%, S 0.010%, P 0.017%, Si 0.02%, Als 0.041%, N 0.0035%, the rest is Fe and inclusions within the allowable range.

[0016] Hot rolling process: billet heating temperature is 1150°C, soaking (holding) time is 2 hours, final rolling temperature is 900°C, front-end cooling is used for cooling, and coiling temperature is 685°C. The rolling specification of hot-rolled strip steel is 3.0×1020mm, and its properties are: tensile strength 331MPa, yield strength 282MPa, and elongation 51.0%.

[0017] Cold rolling process: the rolling thickness of cold rolling is 0.7×1020mm, and the reduction ratio is 70%.

[0018] Galvanizing process: the speed of the production line is 90m / min, the heating temperature of the strip is 807°C, and the soaking temperature of the strip...

Embodiment 2

[0019] Embodiment 2: The preparation method of the high-performance stamping-grade cold-rolled galvanized steel strip adopts the following specific processes.

[0020] Slab chemical composition (wt): C 0.06%, Mn 0.18%, S 0.009%, P 0.013%, Si 0.02%, Als 0.031%, N 0.0033%, the rest is Fe and inclusions within the allowable range.

[0021] Hot rolling process: billet heating temperature is 1110°C, soaking time is 2 hours, final rolling temperature is 905°C, front-end cooling is used for cooling, and coiling temperature is 678°C. The rolling specification of hot-rolled strip steel is 3.0×1020mm, and its properties are: tensile strength 344MPa, yield strength 278MPa, and elongation 50.0%.

[0022] Cold rolling process: the rolling thickness of cold rolling is 0.7×1000mm, and the compression ratio is 70%.

[0023] Galvanizing process: the speed of the production line is 90m / min, the heating temperature of the strip is 808°C, and the soaking temperature of the strip is 807°C; the ce...

Embodiment 3

[0025] Embodiment 3: The preparation method of the high-performance stamping-grade cold-rolled galvanized steel strip adopts the following specific processes.

[0026] Slab chemical composition (wt): C 0.02%, Mn 0.17%, S 0.009%, P 0.013%, Si 0.018%, Als 0.035%, N 0.0030%, the rest is Fe and inclusions within the allowable range.

[0027] Hot rolling process: billet heating temperature is 1100°C, soaking time is 2 hours, final rolling temperature is 890°C, front-end cooling is used for cooling, and coiling temperature is 683°C. The rolling specification of hot-rolled strip steel is 3.5×1020mm, and its properties are: tensile strength 330MPa, yield strength 272MPa, and elongation 51.0%.

[0028] Cold rolling process: the thickness of cold rolling is 0.8×100mm, and the compression ratio is 77.14%.

[0029] Galvanizing process: the speed of the production line is 80m / min, the heating temperature of the strip is 795°C, and the soaking temperature of the strip is 800°C; the central...

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Abstract

The invention discloses a preparation method for a high-performance stamping cold-rolled and galvanized steel strip. The preparation method is characterized in that the steel strip comprises the following chemical components in percentage by mass: 0.01-0.06% of C, 0.10-0.50% of Mn, less than or equal to 0.020% of S, less than or equal to 0.025% of P, less than or equal to 0.05% of Si, greater than or equal to 0.020% of Als, greater than or equal to 0.0040% of N, and the balance of Fe and impurities within a permissible range. The method comprises a holt rolling process, a cold rolling process and a galvanizing process, wherein in the hot rolling process, a heating temperature of steel billet is 1100-1200 DEG C, the heat preservation is carried out for 1-2 hours, and a final-rolling temperature is 890-910 DEG C; a cooling mode adopts a front-stage cooling mode, and a rolling temperature is 670-700 DEG C; in the galvanizing process, the heating temperature of the strip steel is 760-830 DEG C, the soaking temperature is 760-810 DEG C, an annealing cooling rate is greater than or equal to 20 DEG C/s, and the strip steel is added into a zinc pot when being cooled to 460-490 DEG C; and during cooling after plating, overaging time of the strip steel is guaranteed to be greater than or equal to 50s. According to the preparation method disclosed by the invention, the stamping surface and the applicability in various purposes of a product are greatly improved; and the product is guaranteed to be prevented from stamping problems such as transverse grains and the like in a processing and forming process.

Description

technical field [0001] The invention relates to a preparation method of a galvanized steel strip, in particular to a preparation method of a high-performance stamping grade cold-rolled galvanized steel strip. Background technique [0002] With the development of the steel industry, the automobile, home appliance, construction and other machinery manufacturing industries have also developed rapidly, and the consumption of stamping-grade galvanized products is also increasing. Due to the certain deformation of stamping parts for automobiles, outer panels of home appliances and door industry, galvanized products are required to have good stamping performance while having good corrosion resistance. [0003] If the performance of stamping grade galvanized products is not suitable, horizontal stripes and processing wrinkles will often appear during the processing and forming process. It will have a great impact on the next process and even cause waste. [0004] According to past...

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 李建英于世川孙力杜雁冰弓俊杰刘大亮韩冰周雪峰杨丽芳刘飞赵玉刚刘颖冯慧霄周慧春马光宗
Owner TANGSHAN IRON & STEEL GROUP
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