Production method of P265GH steel plate with good low-temperature impact toughness

A technology of low temperature impact toughness and production method, applied in the field of metallurgy, can solve the problems of high production cost, uneven structure of steel plate, unstable impact performance of steel plate, etc., and achieve the effect of low production cost, stable comprehensive performance and improved impact performance.

Pending Publication Date: 2022-04-29
WUYANG IRON & STEEL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the P265GH steel produced by the prior art needs to add Ni element, causing the production cost to be too high
At the same time, due to the production process, the internal structure of the steel plate is not uniform, and the impact performance of the steel plate is unstable.

Method used

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  • Production method of P265GH steel plate with good low-temperature impact toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this example, the thickness of the P265GH steel plate is 60mm. Among the steel plate components, C: 0.12wt%, Mn: 1.10wt%, Nb: 0.015wt%, P: 0.007wt%, S: 0.003wt%, and the remaining alloy elements and mass percentages meet the EN10028 standard Require. Its production method includes smelting, rolling and heat treatment processes, and the steps are as follows:

[0017] (1) Smelting process: control the superheat of the tundish to 15°C; turn on the electromagnetic stirring device during the continuous casting process: the stirring current is 400A, the frequency is 40Hz, the end of the continuous casting is lightly reduced to improve the internal quality of the billet, and the dynamic reduction is 3mm;

[0018] (2) Rolling process: the rough rolling stage and the finishing rolling stage ensure that the rolling reduction of 2 passes is 30mm, and the rough rolling is 2.2 times the thickness of the finished steel plate before finishing rolling; in order to ensure the penetra...

Embodiment 2

[0022] In this example, the thickness of the P265GH steel plate is 65mm. Among the components of the steel plate, C: 0.14wt%, Mn: 1.30wt%, Nb: 0.020wt%, P: 0.006wt%, S: 0.002wt%, and the remaining alloy elements and mass percentages meet the EN10028 standard Require. Its production method includes smelting, rolling and heat treatment processes, and the steps are as follows:

[0023] (1) Smelting process: control the superheat of the tundish to 30°C; turn on the electromagnetic stirring device during the continuous casting process: the stirring current is 450A, the frequency is 60Hz, the end of the continuous casting is lightly reduced to improve the internal quality of the slab, and the dynamic reduction is 5mm;

[0024] (2) Rolling process: the rough rolling stage and the finishing rolling stage ensure that the rolling reduction of 3 passes is 35mm, and the rough rolling is 2.5 times the thickness of the finished steel plate before finishing rolling; Water spray cooling, wat...

Embodiment 3

[0028] In this example, the thickness of the P265GH steel plate is 70mm. Among the components of the steel plate, C: 0.13wt%, Mn: 1.15wt%, Nb: 0.017wt%, P: 0.005wt%, S: 0.002wt%, and the rest of the alloy elements and mass percentages meet the EN10028 standard Require. Its production method includes smelting, rolling and heat treatment processes, and the steps are as follows:

[0029] (1) Smelting process: control the superheat of the tundish to 20°C; turn on the electromagnetic stirring device during the continuous casting process: the stirring current is 420A, the frequency is 50Hz, the end of the continuous casting is lightly reduced to improve the internal quality of the slab, and the dynamic reduction is 4mm;

[0030] (2) Rolling process: the rough rolling stage and the finishing rolling stage ensure that the rolling reduction of 2 passes is 32mm, and the rough rolling is 2.3 times the thickness of the finished steel plate before finishing rolling; in order to ensure the ...

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Abstract

The invention discloses a production method of a P265GH steel plate with good low-temperature impact toughness, and belongs to the technical field of metallurgy. According to the technical scheme, in the smelting procedure, the superheat degree of a tundish is controlled to range from 15 DEG C to 30 DEG C, and electromagnetic stirring and dynamic soft reduction processes are adopted for continuous casting; in the rough rolling and finish rolling stages, it is ensured that the pass reduction of 2-3 passes is 30-35 mm, rough rolling is conducted till the thickness of the rough rolling is 2.2-2.5 times that of a finished steel plate, finish rolling is conducted, the initial rolling temperature of finish rolling is 850-880 DEG C, the finish rolling temperature is 800-820 DEG C, and water cooling is conducted to 650-700 DEG C after rolling; a heat treatment procedure: normalizing and then air-cooling; the steel plate comprises the following components in percentage by weight: 0.12 to 0.14 percent of C, 1.10 to 1.30 percent of Mn, 0.015 to 0.020 percent of Nb, less than or equal to 0.007 percent of P and less than or equal to 0.003 percent of S. The produced P265GH steel plate is good in quality and stable in comprehensive performance, the impact resistance at the low temperature of minus 35 DEG C is larger than or equal to 100 J, and the production cost is low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of a P265GH steel plate with good low-temperature impact toughness. Background technique [0002] P265GH steel is the European standard EN10028 standard steel grade, which is used to manufacture reactors, heat exchangers, separators, spherical tanks, oil and gas tanks, liquefied gas tanks, nuclear reactor pressure shells, liquefied petroleum bottles, turbine volutes, etc. With the rapid development of the economy, the requirements for equipment and steel plates are gradually improved, especially for low temperature impact toughness. [0003] However, the P265GH steel produced by the prior art needs to add Ni element, resulting in high production cost. At the same time, due to the production process, the internal structure of the steel plate is not uniform, and the impact performance of the steel plate is unstable. The present invention improve...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/28C21D6/00C22C33/04C22C38/04C22C38/12
CPCC21D8/0205C21D8/0221C21D8/0247C22C33/04C21D1/28C21D6/005C22C38/04C22C38/12C21D2211/005C21D2211/009
Inventor 尹卫江李建朝龙杰庞辉勇韦明袁锦程吴艳阳刘生牛红星李样兵侯敬超顾自有王甜甜赵紫娟岳欣欣
Owner WUYANG IRON & STEEL
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