A production process of high-grade pipeline steel with low compression ratio and thick specification

A technology with low compression ratio and production process, which is applied in the field of production process of low compression ratio thick gauge high-grade pipeline steel, which can solve unfavorable production of thick gauge X80 pipeline steel, unfavorable grain refinement control, high rough rolling start temperature, etc. problem, to achieve the effect of improving production guarantee ability, improving uniformity and performance stability, and low final cooling temperature

Inactive Publication Date: 2016-02-24
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this document are that the compression ratio is large, which is not conducive to the production of thick gauge X80 pipeline steel by conventional continuous casting machines, and the starting temperature of rough rolling is higher than that of the present invention, which is not conducive to the refinement control of grains
[0007] The Chinese patent application CN103343297A published on July 2, 2013 describes a low-cost X80 pipeline steel wide and thick plate and its production method. Although the ultra-fast cooling and laminar cooling linkage process is adopted, the compression ratio is still above 14.

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  • A production process of high-grade pipeline steel with low compression ratio and thick specification
  • A production process of high-grade pipeline steel with low compression ratio and thick specification
  • A production process of high-grade pipeline steel with low compression ratio and thick specification

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Embodiment 1

[0045]The present embodiment is the specific implementation production process of 33mmX80 with a compression ratio of 7.6. The selected process is suitable for the production of 33mmX80 pipeline steel by 4300 wide and thick plate rolling mill. The thickness of the billet is 250mm, the thickness of the finished plate is 33.2mm, the range of compression ratio is 7.4-7.6, and the total deformation is ≥85%. The process includes the following steps:

[0046] Smelting: adopt clean steel smelting methods, on the basis of ultra-low P and S, control the total amount of five major harmful elements, that is, control the sum of S, P, O, N, and H to less than 150ppm to ensure the purity of steel degree, uniformity. The main chemical composition of the steel is shown in Table 1: During the slab continuous casting process, the dynamic soft reduction technology is adopted, and the central segregation of the slab reaches Class C 1.0.

[0047] Table 133mmX80 chemical composition

[0048] ...

Embodiment 2

[0058] This embodiment is a specific implementation production process of 27mmX80 with a compression ratio of 9.3. The selected process is suitable for the production of X80 pipeline steel in the 4300 wide and heavy plate mill. The thickness of the billet is 250mm, the thickness of the finished plate is 27.2mm, the range of compression ratio is 9.1-9.3, and the total deformation is ≥85%. The process includes the following steps:

[0059] Smelting: adopt clean steel smelting methods, on the basis of ultra-low P and S, control the total amount of five major harmful elements, that is, control the sum of S, P, O, N, and H to less than 150ppm to ensure the purity of steel degree, uniformity. The main chemical composition of the steel is shown in Table 2: During the slab continuous casting process, the dynamic soft reduction technology is adopted, and the quality of the slab reaches C class 1.5.

[0060] Table 227mmX80 chemical composition

[0061]

[0062] Heating: In the he...

Embodiment 3

[0071] This embodiment is a specific implementation production process of 26.4mmX80 with a compression ratio of 9.5. The selected process is suitable for the production of X80 pipeline steel in the 4300 wide and heavy plate mill. The thickness of the billet is 250mm, the thickness of the finished plate is 26.6mm, the range of compression ratio is 9.3-9.5, and the total deformation is ≥85%. The process includes the following steps:

[0072] Smelting: adopt clean steel smelting methods, on the basis of ultra-low P and S, control the total amount of five major harmful elements, that is, control the sum of S, P, O, N, and H to less than 150ppm to ensure the purity of steel degree, uniformity. The main chemical composition of the steel is shown in Table 3: During the slab continuous casting process, the dynamic soft reduction technology is adopted, and the quality of the slab reaches C class 1.5.

[0073] Table 326.4mmX80 chemical composition

[0074]

[0075] Heating: In th...

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Abstract

The invention belongs to the smelting technology field, and specifically relates to a production technology of a thick high-grade pipeline steel with a low compression ratio. The production technology comprises the following steps: smelting, refining, slab continuous casting, slab heating, rough scale removing, rough rolling, intermediate blank cooling, finish rolling, cooling, and hot straightening. Through controlling the specific parameters in each process and the sequence of the technology processes, the production technology can produce thick high-grade pipeline steel with a thickness of 25 mm to 33 mm from continuous casting blanks with a thickness of 250 mm. The production lines that cannot process thick continuous casting blanks is enable to produce thick high-grade pipeline steel by the technology, and thus the production capacity of pipeline steel is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a production process of high-grade pipeline steel with low compression ratio and thick specification. Background technique [0002] In recent years, with the rapid development of the oil and natural gas industry, in order to further improve the transmission efficiency, pipeline transportation is developing in the direction of large diameter, high steel grade, large wall thickness and high pressure transmission. At the same time, long-distance gas pipelines have higher and higher requirements for the strength and toughness of pipeline steel. In order to achieve the above-mentioned purpose, the production of thick-gauge high-grade pipeline steel must ensure the austenite grain refinement effect of rolling in the recrystallization zone of the steel plate, the rolling at low temperature and high pressure in the non-recrystallization zone, and the accurate and uniform aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02C21D11/00C22C33/04C22C38/50C22C38/28C22C38/14
Inventor 郭朝海刘志刚霍自美李国宝王振华刘海波夏佃秀牛延龙
Owner JIGANG GRP
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