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Steel plate having thickness of 150 mm, low compression ratio and low Z-direction performance, and production method thereof

A production method and compression ratio technology, applied in the field of metallurgy, can solve problems such as long waiting time and reduce production rhythm, and achieve the effects of increasing production rhythm, increasing production efficiency and low production cost

Active Publication Date: 2019-01-22
TANGSHAN HEAVY PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And due to the thickness of the plate, it takes a long time to wait for the temperature during rolling, which reduces the production rhythm

Method used

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  • Steel plate having thickness of 150 mm, low compression ratio and low Z-direction performance, and production method thereof
  • Steel plate having thickness of 150 mm, low compression ratio and low Z-direction performance, and production method thereof
  • Steel plate having thickness of 150 mm, low compression ratio and low Z-direction performance, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Table 1 shows the chemical composition and mass percentage of the 150 mm thick low compression ratio Z-direction performance steel plate Q420C-Z35 in this example.

[0027] The production method of the 150mm thick low compression ratio Z-direction performance steel plate Q420C-Z35 in this embodiment includes smelting, continuous casting, heating, controlled rolling and controlled cooling processes, and the specific process steps are as follows:

[0028] (1) Smelting process: After RH vacuum degassing treatment, [H] in molten steel is 0.0001%;

[0029] (2) Continuous casting process: the casting speed of the continuous casting machine is 0.85m / min, the superheat of molten steel in the tundish is 23°C, and the technology of continuous casting dynamic light reduction and casting slab solidification end heavy reduction technology is adopted, and the solid phase ratio is distributed according to the solid phase ratio. Segment reduction, the total reduction of the slab is 21m...

Embodiment 2

[0036] Table 1 shows the chemical composition and mass percentage of the 150 mm thick low compression ratio Z-direction performance steel plate in this example.

[0037] The production method of the 150mm thick low compression ratio Z-direction performance steel plate Q420C-Z35 in this embodiment includes smelting, continuous casting, heating, controlled rolling and controlled cooling processes, and the specific process steps are as follows:

[0038] (1) Smelting process: After RH vacuum degassing treatment, [H] in molten steel is 0.0001%;

[0039] (2) Continuous casting process: The casting speed of the continuous casting machine is 0.89m / min, the superheat of molten steel in the tundish is 17°C, and the technology of continuous casting dynamic light reduction and casting slab solidification end heavy reduction technology is adopted, and the solid phase ratio is distributed according to the solid phase ratio. Segment reduction, the total reduction of the slab is 19mm, the red...

Embodiment 3

[0046] Table 1 shows the chemical composition and mass percentage of the 150 mm thick low compression ratio Z-direction performance steel plate Q345B-Z15 in this example.

[0047] The production method of the 150mm thick low compression ratio Z-direction performance steel plate Q345B-Z15 in this embodiment includes smelting, continuous casting, heating, controlled rolling and controlled cooling processes, and the specific process steps are as follows:

[0048] (1) Smelting process: After RH vacuum degassing treatment, [H] in molten steel is 0.0002%;

[0049] (2) Continuous casting process: the casting speed of the continuous casting machine is 0.85m / min, the superheat of molten steel in the tundish is 15°C, the technology of continuous casting dynamic light reduction and casting slab solidification end heavy reduction technology is adopted, and the solid phase ratio is distributed according to the solid phase ratio. Segment reduction, the total reduction of the slab is 19mm, t...

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Abstract

The invention discloses a steel plate having a thickness of 150 mm, a low compression ratio and a low Z-direction performance, and a production method thereof. The steel plate comprises, by mass, 0.12-0.17% of C, 1.25-1.70% of Mn, 0.002-0.009% of S, 0.008-0.020% of P, 0.30-0.41% of Si, 0.032-0.042% of Als, 0.038-0.045% of Nb, 0.015-0.030% of Ti, 0.0030-0.0050% of N, and the balance of Fe and otherinevitable impurities. The production method comprises the following steps: smelting, continuous casting, heating, controlled rolling and controlled cooling. The rolling compression ratio of the produced steel plate is 1.77-1.80, the production method has the advantages of low production cost and fast production pace, and the steel plate has the characteristics of high flaw detection qualified rate, excellent mechanical properties and high performance uniformity of the microstructure in a thickness direction.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 150mm thick low compression ratio Z-direction performance steel plate and a production method thereof. Background technique [0002] With the rapid development of my country's national economy, the demand for thick-gauge steel plates in the fields of machinery manufacturing, building structures, marine engineering, energy and power is increasing, and thick-gauge steel plates are generally used in key components. Therefore, the mechanical properties and welding properties of steel plates There are extremely strict requirements. The difficulty in the production of thick gauge steel plates lies in the flaw detection performance of the steel plate, the quality of the core of the steel plate, and the uniformity of the microstructure and properties of the steel plate in the thickness direction. At present, the annual output of my country's thick plates over 60mm is onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/12C22C38/14C21D8/02B22D11/12
Inventor 刘伟建王强臧淼郑治秀王丽霞尹绍江杨小龙侯蕾王重君李行
Owner TANGSHAN HEAVY PLATE CO LTD
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