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CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof

A production process and anti-theft door technology, which is applied in the field of metallurgical plate production, can solve the problems of large performance margin of DQ grade galvanized sheet, insufficient performance of CQ galvanized sheet, and high procurement cost, so as to reduce yield strength and eliminate tensile curve , The effect of improving the molding performance

Inactive Publication Date: 2015-05-27
TANGSHAN GUOFENG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a CQ-grade hot-dip galvanized steel strip for anti-theft door panels with obvious cost advantages, low yield strength and high elongation and its production process, so as to solve the problem of CQ produced by conventional processes. Insufficient performance of galvanized sheet and DQ-grade galvanized sheet has a large performance margin and high procurement cost. The performance of the galvanized sheet meets the requirements for deep-drawn anti-theft doors

Method used

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  • CQ-grade hot-dip galvanization steel strip for anti-theft door plate and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The thickness of the finished galvanized sheet for deep-drawing anti-theft door panels is 0.6mm, and the mass percentages of chemical components are: C: 0.05%, Si: 0.011%, Mn: 0.16%, P: 0.015%, S: 0.009%, Als : 0.025%, Fe: balance; gas content in steel T[O]: 25ppm, T[N]: 20ppm.

[0020] Main process and parameters: In the hot rolling process, the coiling temperature is 700°C; the thickness of the hot-rolled sheet is 3.0mm, the thickness of the cold-rolled sheet is 0.58mm, and the cold-rolled reduction rate is 80%; the temperature of the annealing heating section in the galvanizing process is 730 ℃, soaking section temperature 720 ℃, unit speed 90m / min, tension leveling elongation controlled at 1.4%. The yield strength of the finished product is 240Mpa, and the elongation is 36%.

Embodiment 2

[0021] Example 2: The thickness of the finished galvanized sheet for deep-drawing anti-theft door panels is 0.7mm, and the mass percentages of chemical components are: C: 0.05%, Si: 0.010%, Mn: 0.16%, P: 0.017%, S: 0.007%, Als : 0.024%, T[O]: 27ppm, Fe: balance; gas content T[N] in steel: 23ppm.

[0022] Main process and parameters: In the hot rolling process, the coiling temperature is 697°C; the thickness of the hot-rolled sheet is 3.0mm, the thickness of the cold-rolled sheet is 0.68mm, and the cold-rolled reduction rate is 77%; the temperature of the annealing heating section in the galvanizing process is 740 ℃, soaking section temperature 730 ℃, unit speed 85m / min, tension leveling elongation controlled at 1.5%. The yield strength of the finished product is 230Mpa, and the elongation is 35%.

Embodiment 3

[0023] Example 3: The thickness of the finished galvanized sheet for deep-drawing anti-theft door panels is 0.8mm, and the mass percentages of chemical components are: C: 0.06%, Si: 0.011%, Mn: 0.18%, P: 0.015%, S: 0.009%, Als : 0.030%, Fe: balance; gas content in steel T[O]: 20ppm, T[N]: 25ppm.

[0024] Main process and parameters: In the hot rolling process, the coiling temperature is 703°C; the thickness of the hot-rolled sheet is 3.0mm, the thickness of the cold-rolled sheet is 0.78mm, and the cold-rolled reduction rate is 73%; the temperature of the annealing heating section in the galvanizing process is 740 ℃, soaking section temperature 730 ℃, unit speed 80m / min, tension leveling elongation controlled at 1.5%. The yield strength of the finished product is 235Mpa, and the elongation is 38%.

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Abstract

The invention relates to deep-drawing steel plates and production processes thereof and in particular relates to a low-yield strength high-ductility CQ-grade hot-dip galvanization steel strip for an anti-theft door plate and a production process of the steel strip. The steel strip comprises the following chemical components in percentage by mass: 0.030-0.060 percent of C, less than or equal to 0.03 percent of Si, 0.15-0.25 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.015 percent of S, 0.020-0.055 percent of Als and the balance of iron and inevitable impurities. According to the optimized composition design, the process parameters of hot rolling, cold rolling and hot galvanizing procedures are adjusted and optimized, the yield strength of the product is reduced, and the product ductility is improved. According to inspection, the yield strength of the product disclosed by the invention is 230-260MPa, the elongation is 35-38 percent, and the maximum stamping depth is 20mm.

Description

technical field [0001] The invention relates to a deep-drawn steel plate and a production process thereof, in particular to a CQ-grade hot-dip galvanized steel strip for a low-yield high-elongation anti-theft door panel and a production process thereof, belonging to the technical field of metallurgical plate production. Background technique [0002] At present, the market prospect of steel anti-theft doors is good, and the demand for hot-dip galvanized coils is relatively large. At this stage, for the production of anti-theft door panels with deep stamping depth (below 20mm) and complex patterns, it is required that the galvanized sheet has good plasticity and certain stamping performance. On the high side, the upper and lower yield platforms in the tensile curve are more obvious, and in the process of subsequent processing of the anti-theft door, it is easy to warp in different degrees at the deformed part. It is only suitable for making anti-theft doors with a punching dep...

Claims

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Application Information

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IPC IPC(8): C22C38/06C21D8/02
CPCC22C38/02C21D8/0205C21D8/0226C21D8/0236C22C38/04C22C38/06
Inventor 高影张秉青李岩杰兰明清郑涛
Owner TANGSHAN GUOFENG IRON & STEEL
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