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Production method of X80 large-diameter seamless steel pipe with diameter of 1422mm for oil and gas pipeline engineering

A technology of oil and gas pipelines and seamless steel pipes, which is applied in the field of seamless steel pipe manufacturing, can solve problems such as high efficiency, low consumption, and high-quality production requirements, and achieves avoiding side effects of heating pre-oxidation, avoiding sharp surface of knife holes, and uniform longitudinal deformation effect

Active Publication Date: 2022-05-31
YANGZHOU CHENGDE STEEL PIPE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, none of them can meet the urgently needed high-efficiency, low-consumption, and high-quality production requirements.

Method used

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  • Production method of X80 large-diameter seamless steel pipe with diameter of 1422mm for oil and gas pipeline engineering
  • Production method of X80 large-diameter seamless steel pipe with diameter of 1422mm for oil and gas pipeline engineering
  • Production method of X80 large-diameter seamless steel pipe with diameter of 1422mm for oil and gas pipeline engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Composition of X80 steel

[0033] The molten steel after refining is analyzed for composition, and the content of each element is shown in Table 1.

[0034] Table 1 Chemical composition table (unit: wt%)

[0035]

[0036] 2. Production process of continuous casting round tube billet with an outer diameter of 1100mm:

[0037] The refined molten steel was continuously cast into a solid continuous casting round tube billet with an outer diameter of 1100 mm.

[0038] The continuous casting process goes through tundish electromagnetic stirring, secondary electromagnetic stirring and terminal electromagnetic stirring in sequence.

[0039] The pulling speed is 0.10 m / min.

[0040] The length of the central crack is less than or equal to 120mm.

[0041] The depth of surface cracks, pits and flat areas is less than or equal to 20mm.

[0042] The bending degree of the tube blank per meter is ≤10mm, and the total bending degree is not more than 0.6% of the total length....

Embodiment 2

[0066] Six groups of stand rolls are used in uniform continuous rolling. The rolling parameters and die dimensions of the six groups of stand rolls are shown in the table below:

[0067]

[0068] The rest are the same as in Example 1.

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Abstract

The invention discloses a production method of an X80 large-diameter seamless steel pipe with the diameter of 1422mm for oil and gas pipeline engineering, and relates to the technical field of seamless steel pipe manufacturing in the metallurgical industry, X80 steel is continuously cast to obtain a solid round pipe blank, the solid round pipe blank is punched after being heated to obtain a tubular billet, then the tubular billet is subjected to skew rolling expanding to obtain a pierced billet, and then the pierced billet is subjected to flattening continuous rolling, sizing, on-line controlled cooling, straightening, nondestructive inspection and fixed-length saw cutting; the diameter of the solid round tube blank is 1000 mm to 1200 mm; carrying out on-line thermal centering on the solid round tube blank between heating and perforating; the outer diameter of a hollow billet obtained after perforation is 1195 mm; the outer diameter of a pierced billet obtained after oblique rolling and expanding is 1526 mm; the outer diameter of the steel pipe obtained after flattening continuous rolling forming is 1484 mm; the outer diameter of the steel pipe after sizing is 1430 mm; and carrying out on-line controlled cooling on the sized steel pipe, and cooling to obtain the seamless steel pipe with the outer diameter of 1422mm and the wall thickness of 40.5 mm. The requirements for long distance, high pressure, large conveying capacity, low temperature resistance and safety of oil and gas pipelines are met.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipe manufacturing in the metallurgical industry, in particular to a production process for seamless steel pipes with an outer diameter of X80 steel grade of 1219 mm to 1422 mm and a wall thickness of 25 to 50 mm. Background technique [0002] X80 is the American Petroleum Institute API classification model of high-strength pipeline steel with a minimum yield strength value of 555MPa. [0003] With the growing demand for natural gas in my country, in the field of pipeline construction, it has become a trend to improve pipeline transportation efficiency, reduce energy consumption, and reduce investment and operating costs. [0004] For example, in some natural gas transmission pipelines, large-diameter straight seam welded pipes with specifications of X80 and Φ1422mm are used. At the same time, due to the thermal influence of the girth weld and heat-affected zone of the pipe butt on the unb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/04B21B37/78B21C37/06C22C38/02C22C38/04C22C38/44C22C38/42C22C38/48C22C38/50C22C38/46C22C38/58C21D8/10
CPCB21B19/04B21B37/78B21C37/06C22C38/02C22C38/04C22C38/44C22C38/42C22C38/48C22C38/50C22C38/46C22C38/58C21D8/105Y02P70/10
Inventor 张怀德张铮李进
Owner YANGZHOU CHENGDE STEEL PIPE
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