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Production process of thin gauge 700mpa grade ultra-high strength hot-rolled black steel strip

A production process and thin-gauge technology, which is applied in the field of hot-rolled steel strip production technology, can solve problems such as affecting the quality of painting, and achieve the effects of reducing the weight of the whole vehicle, densifying the scale of iron oxide, and improving the processing environment.

Active Publication Date: 2020-08-04
TANGSHAN STAINLESS STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial vehicles require hot-rolled black skin and cold-formed products with dense oxide scale on the surface, and there must be no defects that affect the quality of the paint without rust removal. The products produced by the current background technology are difficult to meet the above requirements

Method used

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  • Production process of thin gauge 700mpa grade ultra-high strength hot-rolled black steel strip
  • Production process of thin gauge 700mpa grade ultra-high strength hot-rolled black steel strip
  • Production process of thin gauge 700mpa grade ultra-high strength hot-rolled black steel strip

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: The production process of the ultra-high-strength hot-rolled black steel strip is specifically as follows.

[0022] After converter smelting, LF furnace refining, and slab continuous casting processes, the mass percentages of the chemical components of the obtained billets are: C0.07%, Mn 1.15%, Cr 0.20%, Mn+Cr 1.35%, S 0.003%, P 0.014 %, Si 0.21%, Als 0.032%, Nb0.015%, Ti 0.105%, Nb+Ti 0.120%, the rest is iron and unavoidable impurities; billet thickness 200mm. The total residence time in the heating furnace is 200 minutes, the heating temperature in the soaking section is 1300°C, and the soaking time is 40 minutes. After rough rolling and finish rolling, it is rolled into a steel strip with a thickness of 2.5mm; the thickness of the intermediate billet is 30mm, the temperature of the advanced and finish rolling is 1070°C, and the temperature of the final rolling is 860°C. The steel strip is rapidly cooled to 770°C first, then air-cooled for 5 seconds in...

Embodiment 2

[0026] Embodiment 2: The production process of the ultra-high-strength hot-rolled black steel strip is specifically as follows.

[0027] After converter smelting, LF furnace refining, and slab continuous casting processes, the mass percentages of the chemical components of the obtained billets are: C0.07%, Mn 1.10%, Cr 0.50%, Mn+Cr 1.60%, S 0.003%, P 0.012 %, Si 0.08%, Als 0.032%, Nb0.050%, Ti 0.07%, Nb+Ti 0.120%, the rest is iron and unavoidable impurities; billet thickness 230mm. The total residence time of the heating furnace is 240 minutes, the heating temperature in the soaking section is 1280°C, and the soaking time is 48 minutes. After rough rolling and finish rolling, it is rolled into a steel strip with a thickness of 4.0mm; the thickness of the intermediate billet is 35mm, the temperature of the advanced and finish rolling is 1030°C, and the temperature of the final rolling is 880°C. The steel strip is rapidly cooled to 760°C first, then air-cooled for 8 seconds in ...

Embodiment 3

[0031] Embodiment 3: The production process of the ultra-high-strength hot-rolled black steel strip is specifically as follows.

[0032]After converter smelting, LF furnace refining, and slab continuous casting processes, the mass percentages of the chemical components of the obtained billet are: C0.05%, Mn 1.60%, Cr 0.03%, Mn+Cr 1.63%, S 0.002%, P 0.015 %, Si 0.15%, Als 0.025%, Nb0.001%, Ti 0.12%, Nb+Ti 0.121%, the rest is iron and unavoidable impurities; billet thickness 180mm. The total residence time in the heating furnace is 180 minutes, the heating temperature in the soaking section is 1320°C, and the soaking time is 35 minutes. After rough rolling and finish rolling, it is rolled into a steel strip with a thickness of 1.5mm; the thickness of the intermediate billet is 36mm, the temperature of the advance and finish rolling is controlled at 1100°C, and the temperature of the finish rolling is 830°C. The steel strip is rapidly cooled to 750°C first, then air-cooled for 3...

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Abstract

The invention discloses a production process of a thin-gauge 700MPa-grade ultra-high strength hot rolled black leather steel strip. The production process includes processes of rough rolling, finish rolling, cooling and coiling; in the process of finish rolling, the finish rolling entry temperature is 1030-1100 DEG C, and the finishing rolling temperature is 830-880 DEG C; in the cooling process,the steel strip is rapidly cooled to 750-790 DEG C through laminar flow cooling, cooled by intermediate air cooling, and then rapidly cooled to coiling temperature through the laminar flow cooling; and in the coiling process, the coiling temperature is 600-650 DEG C. The elongation of the hot rolled black leather steel strip obtained by the production process is not less than 22%; the product of strength and elongation is not less than 16 GMPa%; the steel strip has better cold forming performance and is suitable for producing cold roll forming hollow steel sections such as passenger car skeletons, truck side beams, and through beams; mechanical properties and coating surface quality requirements are met under the condition of omitting the processes of pickling chemical rust removal and mechanical rust removal; and the hot rolled black leather steel strip obtained by the production process is used to replace the Q345B, and can reduce the thickness of required steel plates, the weight ofa whole vehicle and the fuel consumption of the vehicle while the strength of a vehicle body is increased.

Description

technical field [0001] The invention relates to a production process of a hot-rolled steel strip, in particular to a production process of a thin gauge 700MPa-level ultra-high-strength hot-rolled black steel strip. Background technique [0002] With the increasing requirements of the automobile market for energy saving, environmental protection, safety, and comfort, the lightweight of automobile bodies has become an important development direction of today's automobile technology development. Because high-strength steel and ultra-high-strength steel can reduce the weight of the car body while improving the structural strength and energy absorption capacity of the car body, high-strength steel and ultra-high-strength steel are more and more widely used in cars. So far, high-strength steel and ultra-high-strength steel are still one of the most economical and effective ways to reduce weight. As the lightweight of domestic automobile bodies continues, the application of ultra-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/26C22C38/28C22C38/38
CPCC21D8/0205C21D8/0226C21D8/0263C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/26C22C38/28C22C38/38
Inventor 张玉文师可新贾丽慧翁张军李博苏行赵建勇宋晓娟张彦鹏
Owner TANGSHAN STAINLESS STEEL
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