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Low-temperature pipeline steel used for LNG transmission trunk line and preparation method thereof

A pipeline steel, low temperature technology, applied in the field of pipeline steel, to achieve the effect of good comprehensive performance

Inactive Publication Date: 2016-08-17
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a low-temperature pipeline steel for LNG gas transmission main line and its preparation method, which solves how to ensure the -30°C Charpy impact toughness, -25°C drop hammer toughness, strength performance and welding process of the pipeline steel during the welding process of the user. -20°C low temperature toughness and weldability of joints and heat-affected zones

Method used

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  • Low-temperature pipeline steel used for LNG transmission trunk line and preparation method thereof
  • Low-temperature pipeline steel used for LNG transmission trunk line and preparation method thereof
  • Low-temperature pipeline steel used for LNG transmission trunk line and preparation method thereof

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Embodiment 1～5

[0024] One, the chemical composition of the steel plate in the embodiment is as shown in Table 1 below:

[0025] Table 1 steel plate chemical composition (wt%)

[0026]

[0027] The above examples are all chemical composition weight percentages, and the balance is Fe and unavoidable impurity elements.

[0028] Two, embodiment technological system is as shown in table 2 below:

[0029] Table 2 embodiment technological system

[0030]

[0031] Among them, the welding process adopts automatic submerged arc welding with inner four wires and outer four wires, with a voltage of 36-42V and a current of 550-1050A.

[0032] Three, embodiment mechanical properties are as shown in table 3 below:

[0033] The metallographic structure of the low-temperature pipeline steel for LNG gas transmission main line produced in Examples 1-5 is mainly fine quasi-polygonal ferrite, and there is a small amount of granular bainite structure; 1-5% of niobium-titanium composite is distributed on ...

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Abstract

A low-temperature pipeline steel for LNG gas transmission main line and a preparation method thereof, belonging to the technical field of pipeline steel. The weight percent of its chemical composition is: C: 0.03-0.08wt%, Nb: 0.05-0.08wt%, Si: 0.15-0.30wt%, Mn: 1.40-1.65wt%. First smelting, then continuous casting, the steel billet is reheated and then rolled and cooled on the 4300-5500mm production line; after that, the pipe is made and welded through the expanded diameter welded pipe production line. The advantage is that the comprehensive performance is good, and it is suitable for the construction of the transmission pipeline after LNG gasification.

Description

technical field [0001] The invention belongs to the technical field of pipeline steel, and in particular relates to a low-temperature pipeline steel for LNG gas transmission trunk line and a preparation method thereof. The product has excellent low-temperature toughness and is suitable for the construction of pipelines after LNG gasification. Background technique [0002] The "Coastal Imported Liquefied Natural Gas LNG Project" is one of my country's four major energy import channels. Since LNG is a clean and efficient energy source, the proportion of LNG as a fuel in energy supply is increasing rapidly. The annual demand for liquefied natural gas (LNG) is growing at a high rate of 12%, making it one of the fastest growing energy industries in the world. China pays more and more attention to the development of LNG industry, and many coastal LNG gas transmission station projects are being planned and implemented in China. For example, the "Tianjin Liquefied Natural Gas (LN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/18C22C38/08C22C38/14C22C38/02C22C38/04C22C38/06
CPCC22C38/12C22C38/02C22C38/04C22C38/06C22C38/08C22C38/14C22C38/18
Inventor 李少坡丁文华谌铁强李群张海李战军马长文白学军李飞王立峰周德光
Owner SHOUGANG CORPORATION
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