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Method for producing Mo-free low-Nb X80 pipeline steel hot rolled steel plate

A technology of hot-rolled steel plate and manufacturing method, which is applied in the field of manufacturing hot-rolled steel plate of Mo-free and low-Nb X80 pipeline steel, can solve the problems of high manufacturing difficulty and high production cost of X80 pipeline steel, and achieve improved productivity, high strength, and reduced production The effect of manufacturing costs

Active Publication Date: 2011-09-07
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the technical problems of the existing X80 pipeline steel such as high production cost, difficult manufacturing and process stability

Method used

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  • Method for producing Mo-free low-Nb X80 pipeline steel hot rolled steel plate
  • Method for producing Mo-free low-Nb X80 pipeline steel hot rolled steel plate
  • Method for producing Mo-free low-Nb X80 pipeline steel hot rolled steel plate

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] The chemical composition, process parameter and performance result of embodiment 1~3 are as follows:

[0034] ●Chemical composition

[0035]

[0036] ●Hot rolling process

[0037] The process route is as follows: material preparation according to the technical plan, smelting in converter live electric furnace, refining outside the furnace, casting, slab reheating, controlled rolling and controlled cooling.

[0038] The process parameters are as follows:

[0039] (1) Slab heating temperature: 1120~1210℃;

[0040] (2) The starting temperature of controlled rolling in the recrystallization zone: 1080-1170°C;

[0041] (3) Termination temperature of controlled rolling in the recrystallization zone: 950-1050°C;

[0042] (4) The starting temperature of controlled rolling in the non-recrystallization zone: 860-930°C;

[0043] (5) Controlled rolling compression ratio in non-recrystallization zone: ≥75%;

[0044] (6) End rolling temperature: 730-860°C;

[0045] (7) Stop c...

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Abstract

The invention relates to a method for producing an Mo-free low-Nb X80 pipeline steel hot rolled steel plate. The method comprises the following steps of: preparing raw materials in a ratio; smelting the raw materials by using a converter or an electric furnace; refining the smelted raw materials out of the furnace; casting the refined raw materials; reheating a plate blank; and performing controlled rolling and controlled cooling. The method is characterized in that: the heating temperature of the plate blank is of between 1,100 and 1,250 DEG C; the starting temperature of the controlled rolling in a recrystallization zone is of between 1,080 and 1,200 DEG C; the final temperature of the controlled rolling in the recrystallization zone is of between 950 and 1,080 DEG C; the starting temperature of the controlled rolling in a non-recrystallization zone is of between 860 and 950 DEG C; the compression ratio of the controlled rolling in the non-recrystallization zone is more than or equal to 75 percent; the final rolling temperature is of between 730 and 860 DEG C; the final cooling temperature is of between 300 and 550 DEG C; the cooling rate is of between 10 and 35 DEG C / s; produced steel has acicular ferrite and bainite structures and meets the requirement of API SPEC 5L on the performance of X90 pipeline steel; and production-manufacturing is low.

Description

technical field [0001] The invention relates to a method for manufacturing a Mo-free and low-Nb X80 pipeline steel hot-rolled steel plate. Background technique [0002] The demand for natural gas as an energy source is becoming more and more urgent, and it will replace oil as the main source of energy. It is a safe and economical method to transport natural gas from production sites to users through long-distance pipelines. In order to reduce the cost of long-distance transportation of pipelines, especially long-distance transportation of more than 1000 kilometers, high-pressure thin-walled pipelines can effectively (1) reduce the total amount of steel required; (2) reduce the cost of transportation pipelines ; (3) reduce the cost of pipeline laying. Therefore, high-strength and high-toughness X80 pipeline steel has been widely used in many gas transmission pipeline projects in the world, such as the second line of the West-East Gas Pipeline Project in my country. In the R...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02
Inventor 李洋吉玲康熊庆人张伟卫
Owner BC P INC CHINA NAT PETROLEUM CORP
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