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An economical x70 pipeline steel plate used in extra-thick specification ultra-low temperature environment and its manufacturing method

An ultra-low temperature and economical technology, applied in the field of metallurgy, can solve the problems of undefined steel plate thickness, inability to adapt to use, lack of -60°C impact and -30°C drop hammer performance description, etc., to make up for the loss of strength and toughness, strengthen fine Crystal grain effect, strong economical effect

Active Publication Date: 2019-06-25
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention patent with the patent announcement number of CN 104357766 A proposes a high-strength and high-toughness pipeline steel for ultra-deep sea and its manufacturing method. Alloy design, Ni content reaches 0.3-0.5%. The article only mentions the impact energy of the steel plate at -20°C and the drop weight at -15°C. There is no description of the impact energy at -60°C and the drop weight at -30°C. It cannot adapt to a lower temperature environment. Use under
The invention patent with the patent announcement number CN 103999324 A proposes a medium-thick plate for large-wall submarine pipelines and a production method, involving a steel plate with a thickness of 20-33mm, a Ni content of 0.15-0.40%, and a steel plate with -15°C impact and -15°C ℃ drop weight, but there is no performance description for -60°C impact and -30°C drop weight, so it cannot be used in a lower temperature environment

Method used

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  • An economical x70 pipeline steel plate used in extra-thick specification ultra-low temperature environment and its manufacturing method
  • An economical x70 pipeline steel plate used in extra-thick specification ultra-low temperature environment and its manufacturing method
  • An economical x70 pipeline steel plate used in extra-thick specification ultra-low temperature environment and its manufacturing method

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Embodiment 1-2

[0029]According to the scope of chemical composition and manufacturing method of the present invention, pretreatment of molten iron by KR—converter top and bottom blowing—LF refining—RH vacuum degassing—continuous castingcontinuous casting slab covered and slow coolingcontinuous casting slab inspection and cleaning—casting slab Heating—high pressure water descaling—rolling—straightening—slow cooling of the steel plate stack—quenchingtempering, etc., manufacturing thickness 33mm (Example 1) and 40.5mm (Example 2) under the low temperature condition of -60°C The X70 pipeline steel plate used.

[0030] The specific process of the above heating, rolling and slow cooling stages is as follows: heat the continuous casting slab with a thickness of about 450mm to 1080°C, keep it warm for 180min (Example 1 and 2), and use high-pressure water to descale the continuous casting slab after it comes out of the furnace; Stage rolling, the first stage rolling temperature is 1050°C (Example ...

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Abstract

The invention relates to an extra-thick specification economical X70 pipeline steel plate used in an ultra-low temperature environment. The steel plate comprises the following chemical components in percentages by mass: 0.02-0.08% of C, 0.2-0.4% of Si, 0.9-1.7% of Mn, 0.02-0.04% of Al, 0.02-0.08% of Nb, less than or equal to 0.05% of V, less than or equal to 0.2% of Cr, less than or equal to 0.2% of Ni, less than or equal to 0.1% of Mo, less than or equal to 0.2% of Cu, 0.01-0.02% of Ti, less than or equal to 0.0005% of B, less than or equal to 0.006% of P, less than or equal to 0.001% of Si, less than or equal to 0.002% of N, less than or equal to 0.0012% of O, less than or equal to 0.0001% of H, less than or equal to 100 ppm of P+S+[N]+[O]+[H], less than or equal to 0.19% of Pcm and the balance Fe and inevitable impurities. By means of a great compression ratio rolling technology, the effect of refined grains is intensified, strength and toughness loss caused by reduction of alloy elements are remedied, and the steel plate has a better economical benefit.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a pipeline steel plate with an extra-thick specification and used in an ultra-low temperature environment and a manufacturing method thereof. Background technique [0002] The economical X70 pipeline steel plate used in ultra-thick ultra-low temperature environments is mainly used in special environments with complex working conditions such as submarine pipelines, tundra, and ultra-low temperature. With the continuous exploitation of petroleum and petrochemical energy, easy-to-recovery energy has been exploited on a large scale , or even dry up. In order to meet the growing demand for energy, the development and transmission of energy in complex environments has been increasing in recent years, and the design requirements and market demand for submarine pipelines and pipelines in alpine regions have continued to increase. Due to the harsh environment of use, more stringent requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/48C22C38/58C22C38/46C22C38/44C22C38/42C22C38/50C22C38/54C22C38/38C22C38/26C22C38/24C22C38/22C22C38/20C22C38/28C22C38/32C22C38/08C22C38/12C22C38/16C22C38/14C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 孙宪进高助忠胡建国李经涛林涛石艾来许峰
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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