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Production method of extra-deep drawing hot-dip galvanized steel for automobile roofs

A technology of automobile roof and production method, which is applied in hot dip plating process, coating, metal material coating process, etc., can solve the problems of low belt speed, low pass elongation, low furnace temperature, etc., and achieve production cost Lowering, fine surface appearance, uniform color effect

Inactive Publication Date: 2019-12-20
SD STEEL RIZHAO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN 102581007 A discloses a method for producing steel for automobile outer panels with a width of 2000-2070 mm. The annealing temperature is 820-840 °C, the belt speed in the annealing furnace is 90-100 m / min, and the skin-pass elongation of the skin-pass machine is controlled at 1.1 ~1.2%, the purpose is to use lower belt speed, lower furnace temperature, and lower pass elongation to realize the production of ultra-wide automotive outer panels (there are very few such wide-width production lines in the international range), this production method is not suitable High-quality production of ultra-deep-drawn hot-dip galvanized DX56D+Z for automobile roofs with mainstream width specifications ≤ 1850mm described in this patent application

Method used

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  • Production method of extra-deep drawing hot-dip galvanized steel for automobile roofs
  • Production method of extra-deep drawing hot-dip galvanized steel for automobile roofs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The smelting composition is controlled as follows: C=0.0015%, Mn=0.10%, Si=0.005%, P=0.010%, S=0.007%, Als=0.039%, Ti=0.060%, N=0.0027%, O=0.0025%, The balance is Fe and other residual trace elements.

[0023] The whole process process control of Example 1 is as follows: RH refining vacuum degree 15-40pa, decarburization time 20min, argon blowing flow rate between plates 6L / min, liquid level fluctuation ± 2mm, casting speed 1.2m / min; ℃, the furnace time is 225min, U-shaped coiling is adopted, the coiling temperature is 740~750℃ within 30 meters from the head and tail, and the middle part is 720~725℃; the operating speed of the pickling process section is 200mpm, the concentration of pickling corrosion inhibitor is 1‰, cold rolling The total reduction rate is 77.0%, the surface reflectivity of the rolled steel plate is 71.0%, and the residual oil on one side is 220mg / m 2 , residual iron 35mg / m 2 The effective alkali concentration in the cleaning section of the galvaniz...

Embodiment 2

[0026] The smelting composition is controlled as follows: C=0.0018%, Mn=0.14%, Si=0.020%, P=0.015%, S=0.010%, Als=0.038%, Ti=0.069%, N=0.0025%, O=0.0030%, The balance is Fe and other residual trace elements.

[0027]The process control of the whole process of Example 2 is as follows: the vacuum degree in RH refining is 40-65pa, the decarburization time is 17min, the flow rate of argon blowing between plates is 10L / min, the liquid level fluctuation is ±2mm, the casting speed is 1.1m / min; 1226°C, furnace time 240min, U-shaped coiling, coiling temperature 750-765°C within 30 meters of head and tail, 725-733°C in the middle; operating speed of pickling process section 100mpm, pickling corrosion inhibitor concentration 1.5‰, cold The total rolling reduction rate is 85.0%, the surface reflectivity of the rolled steel plate is 70.5%, and the residual oil on one side is 218mg / m 2 , residual iron 45mg / m 2 The effective alkali concentration in the cleaning section of the galvanizing p...

Embodiment 3

[0030] The smelting composition is controlled as follows: C=0.0025%, Mn=0.20%, Si=0.006%, P=0.009%, S=0.012%, Als=0.02%, Ti=0.075%, N=0.0030%, O=0.0021%, The balance is Fe and other residual trace elements.

[0031] The process control of the whole process of Example 3 is as follows: the vacuum degree in RH refining is 95-133pa, the decarburization time is 12min, the argon blowing flow rate between plates is 3L / min, the liquid level fluctuation is ±3mm, the casting speed is 1.3m / min; 1225°C, furnace time 165min, U-shaped coiling, coiling temperature 745-762°C within 30 meters of the head and tail, 718-725°C in the middle; operating speed of pickling process section 150mpm, pickling corrosion inhibitor concentration 3‰, cold The total rolling reduction rate is 80.0%, the surface reflectivity of the rolled steel plate is 73.0%, and the residual oil on one side is 205mg / m 2 , residual iron 40mg / m 2 The effective alkali concentration in the cleaning section of the galvanizing pr...

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Abstract

The invention relates to a production method of extra-deep drawing hot-dip galvanized steel for automobile roofs. The method includes the following steps: performing converter smelting and RH refiningto molten iron in a blast furnace to achieve an ultra-low carbon pure (titanium alloy added) ingredient; continuously casting to form a slab of 230 mm in thickness and off line; performing scaling tothe upper surface and the lower surface and then heating, rolling austenite zone; performing laminar cooling to the front section, reeling and obtaining a hot rolling reel with uniform microstructures and two-phase particles in sparse distribution; slowly cooling to 60 DEG C below and then uncoiling; efficiently pickling, rolling into a chill reel under high pressure; preforming powerful cleaningand continuous annealing, and then performing hot galvanizing; then adopting a polishing machine for polishing and then performing finishing. The yield strength of the steel plate is 150-170 MPa, andthe fluctuation of the yield strength of the full-length reel is equal to and smaller than 7 MPa; the surface appearance is fine and smooth, and the color and lustre are uniform; the steel has the performances of excellent punch forming, dent resistance, welding performance, corrosion resistance and coating performance, fully meets the requirements on materials for high-grade automobile roofs; the technology is simple and easy to control, the production process is stable, and the production cost is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a production method of ultra-deep-drawn hot-dip galvanized steel DX56D+Z for an automobile roof. Background technique [0002] Since the 21st century, with the rapid development of the automobile manufacturing industry, almost all joint venture brand cars have used galvanized sheets, and domestic brand cars have also gradually increased the use of galvanized sheets. The ultra-deep drawing hot-dip galvanized DX56D+Z product for the car roof is one of the varieties with the most difficult production, the highest product grade and the most demand among the car galvanized sheets. properties, corrosion resistance, performance uniformity and stability, paintability, etc., and at the same time strictly limit the surface morphology, roughness and peak number of the steel plate. During the mass use of such products in automobile OEMs, quality problems such a...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C21D8/04C23C2/06C23C2/40
CPCC21D8/0405C21D8/041C21D8/0426C22C38/004C22C38/02C22C38/04C22C38/06C22C38/14C23C2/06C23C2/40
Inventor 王乐陈晓潇李洪翠高兴昌胡华东张磊梁亚丁中康华伟亢业峰高凯程威宇凡董立华许铭李相前
Owner SD STEEL RIZHAO CO LTD
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