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Rolling method of 22mm thick specification x80 large diameter pipeline steel

A large-diameter, pipeline steel technology, applied in the rolling field of 22mm thick X80 large-diameter pipeline steel, can solve the problem of not mentioning the production process of 22mm thick X80 pipeline steel, etc., achieving significant economic benefits, improved qualification rate, excellent quality The effect of welding performance

Active Publication Date: 2019-01-18
内蒙古包钢稀土钢板材有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The comparison found that the literature mainly studies the welding process and the performance of welded pipes, and does not mention the production process of 22mm thick X80 pipeline steel

Method used

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  • Rolling method of 22mm thick specification x80 large diameter pipeline steel
  • Rolling method of 22mm thick specification x80 large diameter pipeline steel
  • Rolling method of 22mm thick specification x80 large diameter pipeline steel

Examples

Experimental program
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Effect test

Embodiment example 3

[0050] The thickness of the rough-rolled intermediate slab is 68mm, the rolling start temperature is 1165°C, the entrance temperature of the final pass is 972°C, and the reduction rate of the final pass is 25.6%.

[0051] The starting temperature of finish rolling is 936°C, the finish rolling temperature is 815°C, the compression ratio of finish rolling is 3.1 times, and the cumulative reduction ratio is 68%.

[0052] After finishing rolling, the plate enters the high-efficiency dense laminar flow cooling system with a cooling rate of 30°C / s and a coiling temperature of 405°C. Finally, the finished board can be obtained.

[0053] Table 1 shows the mechanical properties of the coils corresponding to Cases 1 to 3 of the present invention, and Table 2 shows the mechanical properties of steel pipes welded to the coils corresponding to Cases 1 to 3 of the present invention.

[0054] Table 1 Mechanical properties of steel plates

[0055]

[0056] Table 2 Mechanical properties o...

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Abstract

The invention discloses a rolling method for 22 mm thick-gauge X80 large-diameter pipeline steel. The rolling method comprises the steps that the chemical components of a slab is designed; the coarse rolling stage is conducted, specifically, the thickness of a coarse rolling intermediate slab is 68 mm, the initial rolling temperature is 1160-1180 DEG C, the last pass inlet temperature is smaller than or equal to 980 DEG C, and the last pass reduction rate is larger than or equal to 25%; and the finish rolling stage is conducted, specifically, the initial finish rolling temperature is small than or equal to 950 DEG C, the final rolling temperature is 790-830 DEG C, the finish rolling compression ratio is larger than or equal to 3 times, and the accumulative reduction rate is larger than or equal to 65%. Through the rolling method, a hot-rolled plate coil has the good tensile property, low-temperature impact toughness, DWTT fracture toughness and the excellent welding property.

Description

technical field [0001] The invention relates to a steel rolling technology, in particular to a rolling method of X80 large-diameter pipeline steel with a thickness of 22 mm. Background technique [0002] With the development of the national economy and energy strategy, it is imminent to build a pipeline project with an annual gas transmission capacity of more than 40 billion cubic meters. In order to meet the needs of the land environment, construction, environmental protection and operating life of the pipeline project, high It is imperative to use thick-walled and high-strength pipeline steel for pressure, large-diameter, and large-capacity oil and gas pipelines. [0003] At present, the wall thickness of steel X80 pipes used in domestic important pipeline projects such as the Second West-East Gas Pipeline, the Third West-East Gas Pipeline, the China-Myanmar Pipeline, and the Zhonggui Pipeline has reached more than 20 mm. Pipeline projects such as pipelines will also use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/14C22C38/08C22C38/16C22C38/18C21D8/02B21B37/74B21B45/02B21B37/56
CPCB21B37/56B21B37/74B21B45/0203B21B2261/20B21B2265/10C21D8/0226C21D2211/002C21D2211/005C22C38/02C22C38/04C22C38/08C22C38/12C22C38/14C22C38/16C22C38/18
Inventor 孟繁英王雪莲袁晓鸣田荣彬周学刚王少炳杨永朋
Owner 内蒙古包钢稀土钢板材有限责任公司
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