Process for producing thin gauge pipeline steel by using double-stand medium and heavy plate mill

Abstract

The invention discloses a process for producing thin gauge pipeline steel by using a double-stand medium and heavy plate mill. A plate blank with the thickness of 180 mm is used for producing the thin gauge pipeline steel with the thickness less than 10 mm. On the basis that the performance of a rolled piece meets requirements, the thin gauge pipeline steel with a good plate shape can be obtained by controlling the tapping temperature of the plate blank, the rough rolling broadening pass pressing rate, the longitudinal rolling pass pressing rate after rough rolling broadening pass, the rough rolling finishing temperature, the thickness of a middle blank, the finish rolling ending pass pressing rate, the finish rolling finishing temperature, the roller gap inclination and sled function in the rolling process, a high pressure water descaling system, the water entry temperature, the re-reddening temperature, and the head and tail shielding and straightening process of a laminar cooling system. The deformation rate is reduced, and the economic benefit is increased.

Description

technical field

[0001] The invention belongs to the field of steel rolling, and relates to a production process of pipeline steel, in particular to a production process of thin-gauge pipeline steel in a double-stand medium-thick plate rolling mill. Background technique

[0002] When using a 180mm thick slab to produce thin-gauge pipeline steel with a thickness of less than 10mm on a 2800mm double-stand medium-heavy plate rolling mill, in view of the location of each equipment on the production line and the consideration of product yield, the billet is double the size of the ordered steel plate Or three times the ruler to design, its length does not exceed 2.5m. During the rolling process of the double-stand rolling mill, the rolled piece becomes thinner and longer, and the temperature drops faster and faster, especially at the head and tail. The uneven temperature in the length direction of the rolled piece leads to fluctuations in the performance of the rolled piece and th...

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