Steel plate made of pressure vessel steel ASTMA387CL11Gr2 and production method thereof

Abstract

The invention discloses a steel plate made of pressure vessel steel ASTMA387CL11Gr2, which can meet the use requirements of equipment, and a production method thereof. The steel plate made of the pressure vessel steel ASTMA387CL11Gr2 comprises the following chemical components in percentage by mass: 0.10 to 0.17 percent of C, less than or equal to 0.55 percent of Si, 0.40 to 0.65 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.20 percent of Ni, 1.20 to 1.50 percent of Cr, less than or equal to 0.10 percent of Cu, 0.45 to 0.65 percent of Mo, 0.025 to 0.050 percent of Al, less than or equal to 0.016 percent of As, less than or equal to 0.005 percent of Sn, less than or equal to 0.003 percent of Sb, less than or equal to 0.003 percent of O, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H and the balance of Fe and unavoidable impurities. According to the invention, the chemical components of the steel plate are designed by using Cr-Mo as the basic alloy elements; by the process route of converter steelmaking, LF (low frequency) furnace refining, VD (vacuum degassing) furnace vacuum degassing, rolling, fault detection, normalizing, tempering, steel plate finishing and performance examination, the suitable internal controlled composition is made, the fluctuation range of the chemical components is strictly controlled and stability of performance of the steel plate is ensured; the LF and VD processes are adopted to ensure cleanness of the steel; blending control and smelting operation are reinforced; the content of harmful elements such as Sn, Sb, As, O, N and H is effectively controlled; the temper embrittlement tendency is reduced; the high-temperature corrosion resistance of the steel is improved.

Description

technical field [0001] The invention relates to an extra-thick steel plate, in particular to a pressure vessel steel ASTMA387CL11Gr2 steel plate capable of being used for equipment and a production method thereof. Background technique [0002] ASTMA387CL11Gr2 is widely used in petroleum, chemical industry, 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 ASTMA387CL11Gr2 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 ASTMA387CL11Gr2 steel plate has a narrow range of specifications, and the l...

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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 ASTMA387CL11Gr2 steel plate has a narrow range of specifications, and the latest national standard stipulates that the thickness limit is 100mm, the current domestic production technology equipment and technology level, it is difficult to guarantee the performance of the steel plate with a thickness exceeding 100mm, and cannot meet the growing market demand for thick plates, mainly relying on imported products

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