Chromium-molybdenum steel plate for large-diameter single-pass straight weld pressure pipeline and production method thereof

Abstract

The invention provides a chromium-molybdenum steel plate used for a large-caliber single-channel straight weld joint pressure pipeline and a production method of the chromium-molybdenum steel plate. The steel plate comprises, by weight percent, 0.08%-0.12% of C, 0.10%-0.30% of Si, 0.40%-0.60% of Mn, smaller than or equal to 0.010% of P, smaller than 0.003% of S, 3.0%-3.5% of Cr, 1.20%-1.60% of Mo,0.02%-0.05% of Nb, 0.015%-0.050% of Als and the balance Fe and inevitable impurities. The production method includes the steps of liquid iron pretreatment, converter smelting, out-of-furnace refining, continuous casting, casting blank heating, controlled rolling and controlled cooling and heat treatment. The chromium-molybdenum steel plate which is manufactured through brand new chemical component design and technological routes and used for the large-caliber single-channel straight weld line pressure pipeline has good normal-temperature tensile performance, the transverse performance of theoverall plate is uniform, unevenness is below 8 mm / m, and safety and operation efficiency of the pressure pipeline are improved obviously.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a chromium-molybdenum steel plate for a large-caliber single-pass straight weld pressure pipeline and a production method thereof. Background technique [0002] The pressure pipeline is a tubular device used to transport gas or liquid with a certain pressure. Its scope is defined as the gas, liquefied gas, steam medium or flammable, explosive, toxic, Corrosive, liquid media with a maximum working temperature higher than or equal to the standard boiling point, and pipes with a nominal diameter greater than 50mm are divided into industrial pipelines, public pipelines and long-distance pipelines according to their uses. Among them, industrial pipelines are mainly used in oil refining, chemical industry, and metallurgy. , electric power and other industries, especially in the field of refining and chemical industry, with the continuous development of China's economy, the pe...

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Problems solved by technology

In the case of exempting from the high-temperature normalizing or quenching process in the production process of chrome-molybdenum steel plate, the comprehensive performance, transverse uniformity, plate shape and other indicators are still excellent, and at the same time, it solves the problem that it is impossible to manufacture a single weld with a large diameter of 1600mm or more due to the insufficient width of the steel plate The technical problems of pipelines, and prolong the service life of pipelines, reduce the probability of accidents, and increase production efficiency. This invention can strongly support the development of my country's petroleum refining and chemical industry to large-scale, intensive, and high-efficiency

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