Strain design pipeline steel X65 steel plate and production method thereof

Abstract

The invention provides a strain design pipeline steel X65 steel plate and a production method thereof, wherein the strain design pipeline steel X65 steel plate comprises, by weight, 0.030-0.080% of C,1.50-1.70% of Mn, 0.10-0.40% of Si, less than or equal to 0.0050% of S, less than or equal to 0.015% of P, 0.035-0.060% of Nb, 0.008-0.025% of Ti, less than or equal to 0.10% of V, 0.020-0.060% of Alt, less than or equal to 0.20% of Cr, less than or equal to 0.10% of Mo, and the balance of Fe and inevitable impurities. According to the present invention, the production method of the stell plate uses the laminar flow segmentation cooling process, such that the problem that the long relaxation and air cooling time causes the low production efficiency in the existing production process is solved, the problem of the length performance fluctuation of the steel plate during the water cooling is solved, and the high-efficiency production of the stable-performance pipeline steel is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel material engineering, and relates to a strain design pipeline steel X65 steel plate and a production process thereof, in particular to producing a strain design pipeline steel X65 steel plate by using a laminar flow segmental cooling process on a steckel mill production line. Background technique [0002] More and more oil and gas pipeline projects need to be carried out in seismic zones, tundra zones and other places, which requires a large amount of strain design pipeline steel. Strain design pipeline steel requires high work hardening capacity and uniform elongation. In recent years, strain design pipeline steel has been applied in batches in China. Its production process is generally to carry out relaxation air cooling after rolling, and then carry out rapid water cooling at about 700°C. This will easily lead to a longer air cooling time after rolling, which will increase the producti...

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Problems solved by technology

[0005] Another object of the present invention is to provide a kind of production method of above-mentioned strain design pipeline steel X65 steel plate, utilize laminar flow subsection cooling process in the production process to solve the problem of low production efficiency caused by the long relaxation air cooling time in the existing production process, at the same time , to solve the problem of performance fluctuations in the length of the steel plate caused by water cooling, and to achieve high-efficiency production of pipeline steel with stable performance

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