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A kind of high-toughness B-containing hot-rolled low-carbon bainite steel plate and its production method

A low-carbon bainite and production method technology, applied in the field of steel material engineering, can solve the problems of strength and impact toughness fluctuations, large fluctuations in strength and impact toughness, etc., so as to reduce the strength difference, reduce the rolling direction and the transverse strength difference , the effect of toughness index optimization

Active Publication Date: 2020-10-16
ANYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-toughness B-containing hot-rolled low-carbon bainite steel plate. The steel plate of the present invention has small fluctuations in strength and impact toughness, effectively solving the problem of existing B-containing low-carbon bainite in the background technology. The problem of large fluctuations in strength and impact toughness of steel plates
[0005] Another object of the present invention is to provide a production method of the above-mentioned high-toughness B-containing hot-rolled low-carbon bainite steel plate. The problem of large fluctuations in strength and impact toughness, and the B-containing hot-rolled low-carbon bainite steel plate with small fluctuations in strength and impact toughness are more conducive to application in the construction machinery industry

Method used

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  • A kind of high-toughness B-containing hot-rolled low-carbon bainite steel plate and its production method
  • A kind of high-toughness B-containing hot-rolled low-carbon bainite steel plate and its production method
  • A kind of high-toughness B-containing hot-rolled low-carbon bainite steel plate and its production method

Examples

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Embodiment 1

[0021] See Table 1 for the chemical composition (wt%) of the high-toughness B-containing hot-rolled low-carbon bainite steel hot-rolled flat plate Q690 in this example.

[0022] Table 1 Chemical composition (wt%) of high toughness B-containing hot-rolled low-carbon bainite steel Q690 hot-rolled flat plate

[0023] element C Si mn P S Nb Ti Alt B Cr Mo content 0.07 0.20 1.75 0.009 0.003 0.051 0.012 0.035 0.0018 0.25 0.10

[0024] The specific parameters of the rolling process and the laminar flow segmental cooling process in the production process of the high-toughness B-containing hot-rolled low-carbon bainite steel hot-rolled flat plate Q690 in this embodiment are shown in Table 2.

[0025] The production process of the high-toughness B-containing hot-rolled low-carbon bainite steel plate in this embodiment: the reheating temperature is 1250° C., and the furnace time is 3 hours. Two-stage controlled rolling is adopted, rough rol...

Embodiment 2

[0032] Table 4 shows the chemical composition (wt%) of the high-toughness B-containing hot-rolled low-carbon bainite steel hot-rolled flat plate Q690 in this example.

[0033] Table 4 Chemical composition (wt%) of hot-rolled low-carbon bainite steel Q690 hot-rolled flat plate containing B with high toughness

[0034] element C Si mn P S Nb Ti Alt B Cr Mo content 0.07 0.23 1.73 0.011 0.003 0.049 0.014 0.037 0.0017 0.25 0.10

[0035] The production process of the high-toughness B-containing hot-rolled low-carbon bainite steel plate in this embodiment: the heating temperature is 1260° C., and the furnace time is 3 hours. Two-stage controlled rolling is adopted, rough rolling is rolling in the recrystallization zone for 4 passes, the starting rolling temperature is 1100°C, and the final rolling temperature is 1085°C; the intermediate billet thickness is 70mm, and finishing rolling is rolling in the non-recrystallization zone for 7 pas...

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Abstract

The invention provides a high-toughness B-containing hot-rolling low-carbon bainite steel plate. The high-toughness B-containing hot-rolling low-carbon bainite steel plate comprises the following components in percentage by weight: 0.030 to 0.080 percent of C, 1.50 to 1.80 percent of Mn, 0.10 to 0.40 percent of Si, less than or equal to 0.0050 percent of S, less than or equal to 0.015 percent of P, 0.030 to 0.060 percent of Nb, 0.008 to 0.020 percent of Ti, less than or equal to 0.10 percent of V, 0.020 to 0.060 percent of Alt, 0.0010 to 0.0025 percent of B, 0.20 to 0.50 percent of Cr, less than or equal to 0.30 percent of Mo and the balance of Fe and unavoidable impurities. In the production process of the steel plate, the problems that the existing B-containing hot-rolling low-carbon bainite steel plate has great fluctuation of strength and impact toughness are solved by utilizing a laminar flow section cooling process, the B-containing hot-rolling low-carbon bainite steel plate withsmall fluctuation of strength and impact toughness is obtained, and the application of the high-toughness B-containing hot-rolling low-carbon bainite steel plate to the construction machinery industry is facilitated.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material engineering, and relates to a high-toughness B-containing hot-rolled low-carbon bainite steel plate and a production process thereof, in particular to producing a high-toughness B-containing steel plate using a laminar flow segmental cooling process on a steel coil rolling mill production line. Hot rolled low carbon bainite steel plate. Background technique [0002] In recent years, 80Kg level low-carbon bainite steel plates have been more and more widely used in the construction machinery industry, and the composition system and production process are quite different due to different manufacturers. B (boron) alloys are less expensive and are increasingly used in low carbon bainitic steels. However, due to the large fluctuations in strength and impact toughness of B-containing low-carbon bainitic steels, the TMCP+tempering process is generally used to control the fluctuations in i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C21D8/02C22C33/04
CPCC21D8/0205C22C33/04C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32
Inventor 李静宇李勇韦弦段贵生曹树卫孔徳南徐党委郑建道刘文浩邓杭州
Owner ANYANG IRON & STEEL
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