High-drawing high-reaming 1200MPa-grade cold-rolled strip steel and production method

A technology of cold-rolled strip steel and production methods, applied in the field of metallurgy, can solve the problems of reduced drawing performance and hole expansion performance, increase in strength, etc., and achieve improved drawing performance and hole expansion performance, refined grains, and high stability sexual effect

Active Publication Date: 2021-06-15
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As the lightweight of automobiles is more and more favored by major automobile OEMs, the proportion of ultra-high-strength steel used by automobile OEMs is increasing year by year, but the increase in strength brings about a decrease in drawing performance and hole expansion performance

Method used

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  • High-drawing high-reaming 1200MPa-grade cold-rolled strip steel and production method
  • High-drawing high-reaming 1200MPa-grade cold-rolled strip steel and production method
  • High-drawing high-reaming 1200MPa-grade cold-rolled strip steel and production method

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Experimental program
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Effect test

Embodiment 1

[0029] In this embodiment, a high-drawing and high-hole-expanding 1200MPa-grade cold-rolled steel strip has a thickness of 2.0 mm, its chemical composition and mass percentage are shown in Table 1, and its mechanical properties are shown in Table 2.

[0030] In this embodiment, a production method of high-drawing and high-hole-expanding 1200MPa grade cold-rolled steel strip includes continuous casting, heating, hot-rolling, cold-rolling, continuous annealing and smoothing processes, and the specific process steps are as follows:

[0031] (1) Continuous casting process: tundish temperature 1520°C, continuous casting casting speed 1.3m / min;

[0032] (2) Heating process: Heating with a walking heating furnace, the soaking temperature of the heating section of the continuous casting slab is 1240°C, and the total heating time is 180min;

[0033] (3) Hot rolling process: finishing rolling temperature is 860°C, coiling temperature is 640°C;

[0034] (4) Cold rolling process: cold ro...

Embodiment 2

[0039] In this implementation, a high-drawing and high-hole-expanding 1200MPa-grade cold-rolled steel strip has a thickness of 1.0mm. Its chemical composition and mass percentage are shown in Table 1, and its mechanical properties are shown in Table 2.

[0040] In this embodiment, a production method of high-drawing and high-hole-expanding 1200MPa grade cold-rolled steel strip includes continuous casting, heating, hot-rolling, cold-rolling, continuous annealing and smoothing processes, and the specific process steps are as follows:

[0041] (1) Continuous casting process: tundish temperature 1510°C, continuous casting casting speed 1.2m / min;

[0042] (2) Heating process: Heating by a walking heating furnace, the soaking temperature of the heating section of the continuous casting slab is 1290°C, and the total heating time is 190min;

[0043] (3) Hot rolling process: the finish rolling temperature is 900°C, and the coiling temperature is 655°C;

[0044] (4) Cold rolling proces...

Embodiment 3

[0048] In this embodiment, a high-drawing and high-hole-expanding 1200MPa-grade cold-rolled steel strip has a thickness of 1.6 mm, its chemical composition and mass percentage are shown in Table 1, and its mechanical properties are shown in Table 2.

[0049] In this embodiment, a production method of high-drawing and high-hole-expanding 1200MPa grade cold-rolled steel strip includes continuous casting, heating, hot-rolling, cold-rolling, continuous annealing and smoothing processes, and the specific process steps are as follows:

[0050] (1) Continuous casting process: tundish temperature 1530°C, casting speed 1.4m / min;

[0051] (2) Heating process: Heating with a walking heating furnace, the soaking temperature of the heating section of the continuous casting slab is 1300°C, and the total heating time is 240min;

[0052] (3) Hot rolling process: the finish rolling temperature is 880°C, and the coiling temperature is 670°C;

[0053] (4) Cold rolling process: cold rolling reduct...

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Abstract

The invention discloses high-drawing high-reaming 1200MPa-grade cold-rolled strip steel and a production method. The strip steel comprises the following chemical components in percentage by mass: 0.08 to 0.11 percent of C, 1.5 to 3.0 percent of Mn, less than or equal to 0.005 percent of S, less than or equal to 0.020 percent of P, 0.15 to 0.5 percent of Si, 0.10 to 0.60 percent of Als, 0.20 to 0.50 percent of Cr, 0.020 to 0.060 percent of Nb, 0.010 to 0.080 percent of Ti, 0.10 to 0.45 percent of Ni, 0.010 to 0.035 percent of Mo, 0.0010 to 0.0050 percent of B and the balance of Fe and unremovable impurities. The production method comprises the procedures of continuous casting, heating, hot rolling, cold rolling, continuous annealing and leveling. Through reasonable component design, the produced strip steel is suitable for various automobile parts with high requirements for reaming performance and drawing performance, and has low cost and high market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-drawing and high-hole expansion 1200MPa grade cold-rolled steel strip and a production method. Background technique [0002] As the lightweight of automobiles is increasingly favored by major automobile OEMs, the proportion of ultra-high-strength steel used by automobile OEMs has increased year by year, but the increase in strength has brought about a decrease in drawing performance and hole expansion performance. For example, when using DP1200 to make auto parts, due to its elongation A 50 ≤5%, hole expansion rate ≤12%, lead to cracking in the drawing sequence, and material failure, such as figure 2 shown. Therefore, for 1200MPa ultra-high-strength steel, it is necessary to develop a strip steel that has high strength and takes into account both drawing performance and hole expansion performance. [0003] Patent CN 108823493A provides an environment-frie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/58C22C38/54C22C38/50C22C38/48C22C38/44C21D8/02
CPCC22C38/02C22C38/06C22C38/58C22C38/54C22C38/50C22C38/48C22C38/44C21D8/0226C21D8/0236C21D8/0247C21D8/0242C21D2211/005C21D2211/008C21D2211/002C21D2211/001
Inventor 刘靖宝邝霜王朝陈卓刘丽萍张杰冯晓勇李孟星杨明维
Owner TANGSHAN IRON & STEEL GROUP
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