Manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for polar region

A low-temperature toughness and manufacturing method technology, applied in the field of metallurgy, can solve problems such as inability to use, and achieve the effects of excellent low-temperature toughness, excellent cold-bending performance, and good strength and toughness

Inactive Publication Date: 2016-01-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its invention has obtained TMCP type E40 steel plate with good low temperature toughness and its manufacturing method, but the thickness range of the steel plate is only 10~70mm, and the quality grade only reaches the E level, and it cannot be used in harsh environments such as extremely cold regions.

Method used

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  • Manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for polar region
  • Manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for polar region

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The rolling process of the target steel grade is carried out as in process a in Table 1, and the conventional mechanical properties are as shown in Example 1 in Table 2.

Embodiment 2

[0026] The rolling process of the target steel grade is carried out as in process b in Table 1, and the conventional mechanical properties are as shown in Example 2 in Table 2.

Embodiment 3

[0028] The rolling process of the target steel type is as in process c in Table 1, and the conventional mechanical properties are as shown in Example 3 in Table 2.

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Abstract

The invention discloses a manufacturing method for high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness for a polar region. Common continuous castings serve as raw materials, the low-sulfur smelting technology is utilized, and the TMCP technology is adopted for rolling. During rolling, the near surface of a middle blank is rapidly cooled to be below Ar3 in an acceleration manner, temperature re-rising of the near surface is achieved through the heat of a core part of the middle blank, and after the surface temperature of the middle blank is stabilized to the set initial rolling temperature, rolling of a non-recrystallization area is carried out; and after rolling, an ultra-fast cooling device is used for accelerated cooling, and then the high-strength ship TMCP steel superior in minus-80 DEG C low-temperature toughness is obtained. A steel plate is superior in mechanical performance, high in operability, low in cost and high in production efficiency.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to an ultra-low-carbon micro-alloy high-strength steel wide and thick plate and a manufacturing method thereof, in particular to a manufacturing method of high-strength marine TMCP steel with excellent low-temperature toughness at -80°C for polar regions. Background technique [0002] In recent years, with the rapid development of my country's shipbuilding industry, the rapid development of marine wide and thick plates has been driven. The modern shipbuilding industry is developing toward large-scale and lightweight, and the application proportion of high-strength and high-quality marine wide-thick and extra-thick plates is constantly increasing. Traditional ferritic pearlitic steel has limited ability to improve strength and toughness by increasing cooling rate; tempered martensitic high-strength steel usually has high alloy cost and manufacturing cost, and long production cycle. By adjust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C22C38/14
Inventor 王同良邱保文崔强
Owner NANJING IRON & STEEL CO LTD
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