Large-thickness hydrogenating 14Cr1MoR steel plate and production method thereof

Abstract

The invention provides a large-thickness hydrogenating 14Cr1MoR steel plate and a production method thereof. The large-thickness hydrogenating 14Cr1MoR steel plate is composed of following elements: 0.10%-0.17% of C, less than or equal to 0.55% of Si, 0.40%-0.65% of Mn, less than or equal to 0.008% of P, less than or equal to 0.03% of S, less than or equal to 0.20% of Ni, 1.20%-1.50% of Cr, less than or equal to 0.10% of Cu, 0.45%-0.65% of Mo, 0.025%-0.050% of Al, less than or equal to 0.016% of As, less than or equal to 0.005% of Sn, less than or equal to 0.003% of Sb, less than or equal to 0.003% of O, less than or equal to 0.008% of N, less than or equal to 0.0002% of H and the balance of Fe and unavoidable impurities. The production method comprises the following steps: smelting; pouring; heating; rolling; carrying out water cooling; slowly cooling; carrying out heat treatment. The steel plate adopts a two-phase control rolling process, namely an II type control rolling process, so that the problems that the rolling pressure of a rolling machine is not enough, crystal grains are rough and not uniform and the impact toughness is reduced are solved; the rolling process of the steel plate is simple and easy, is easy to operate and is suitable for production of common steel factories with normalizing furnaces, outer machine furnaces and car bottom furnaces.

Description

technical field [0001] The invention relates to an extra-thick steel plate, in particular to a 14Cr1MoR thick steel plate (100-150mm) capable of meeting hydrogen equipment and a production method thereof. Background technique [0002] 14Cr1MoR is widely used in petroleum, chemical, power station, boiler and other industries to make reactors, heat exchangers, oil and gas tanks, liquefied gas tanks, nuclear reactor pressure vessels and other equipment and components. [0003] Conventional 14Cr1MoR generally does not require hydrogen-facing properties, and has relatively low requirements for elements such as P, Sn, As, and Sn. With the development of large-scale equipment, higher requirements are put forward for the single weight and thickness of the steel plate. In addition, due to the difficulty in the heat treatment process of the thick steel plate, the commercialized 14Cr1MoR hydrogen-resistant steel plate has a narrow range of specifications, and the thickness specified b...

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Problems solved by technology

With the development of large-scale equipment, higher requirements are put forward for the single weight and thickness of the steel plate. In addition, due to the difficulty in the heat treatment process of the thick steel plate, the commercialized 14Cr1MoR hydrogen-resistant steel plate has a narrow range of specifications, and the thickness specified by the latest national standard The limit is 150mm. With the current domestic production technology equipment and technological level, it is difficult to guarantee the performance of the steel plate with a thickness exceeding 100mm. It cannot meet the growing market demand for thick plates and mainly relies on imported products.

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