High strength X100 pipeline steel produced by steekle mill and production technique thereof

Abstract

The invention relates to high-strength steel and a production process thereof, which are high-strength multiplied by 100 pipeline steel produced by a steckel mill and the production process thereof. The main control ranges of parameters of the hot rolling process are as follows: the heating temperature of flat blanks is 1100 to 1250 DEG C; the final temperature of rolling controlling of a recrystallization zone is 1000 to 1080 DEG C; the beginning temperature of rolling controlling of a non-recrystallization zone is 900 to 980 DEG C; the final rolling temperature is 720 to 880 DEG C; and the final cooling temperature is 200 to 500 DEG C and the cooling temperature is 3 to 40 DEG C per second. The production process is suitable for the production line of the steckel mill and also for the production line of medium heavy plates with weaker rolling power, solves the technical problem that the existing production line of the steckel mill or the production line of thick heavy plates with insufficient production capacity can not produce the high-strength pipeline steel smoothly.

Description

technical field [0001] The invention relates to a high-strength steel and a production process thereof, in particular to a high-strength X100 pipeline steel produced by a steckel mill and a production process thereof. Background technique [0002] In recent years, with the increasing demand for energy and the rapid development of the long-distance natural gas transmission industry, high-grade pipeline steel has attracted more and more attention because of its significant cost advantage. At present, X70, which used to be the highest steel grade in the international standard for a long time, has been replaced by X80. Although X100 and higher grades are currently in the early stage of development, due to the advantages of saving materials, increasing conveying pressure, reducing construction volume, reducing maintenance costs, and optimizing The advantages of the overall scheme and other aspects can save the cost of long-distance oil and gas pipelines by 5% to 12%. The huge eco...

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Problems solved by technology

However, due to the high difficulty of producing high-grade pipeline steel of X100 and above grade, in the literature at home and abroad, there is no relevant report on the production of X100 or higher grade pipeline steel on the production line of the steckel mill

[0004] In the relevant patents of the United States, Japan and Europe (US Patent US 20030217795, Japanese Patent JP 2001113374A, European Patent EP 1020539, European Patent EP1354973), the main components and production process of X100 pipeline steel are mentioned, but Mg, Difficult and complex technologies such as Al oxide or nitride metallurgy increase the difficulty of manufacturing

In the patent CN 100398684C authorized by Baosteel in my country in July 2008, although the complex technology of oxide metallurgy was abandoned in the composition design, in terms of rolling technology, the starting rolling temperature of the lower non-recrystallization zone (800~ 900°C) makes the rolling temperature of the second stage lower, coupled with the high strength of X100 pipeline steel itself, this production process has brought great difficulties to the production line with weak rolling force

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