Thick chromium-molybdenum steel plate for hydrogenation equipment and production method thereof

Abstract

The invention discloses a thick chromium-molybdenum steel plate for hydrogenation equipment, and also discloses a production method of a steel plate. The steel plate comprises the following components by weight percent: 0.12%-0.15% of C, 0.02%-0.07% of Si, 0.50%-0.60% of Mn, less than or equal to 0.007% of P, less than or equal to 0.005% of S, 2.35%-2.50% of Cr, 0.95%-1.10% of Mo, 0.012%-0.02% ofNb, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Ni, less than or equal to 0.003% of Sb, less than or equal to 0.005% of Sn, less than or equal to 0.016% of As, less than or equal to 0.003% of O, less than or equal to 0.008% of N and less or equal to 0.0002% of H, the balance of Fe and inevitable impurities. For the steel plate, an electroslag remelting technology is adopted,electroslag ingot with the maximum piece weight being 50t is melted, and the maximum thickness of the produced thick chromium-molybdenum steel plate for the hydrogenation equipment can achieve 198mm,and the maximum piece weight of the single-piece finished steel plate can achieve 37.2t by a heating-rolling technology and thermal-processing production equipment of normalizing plus accelerated cooling plus tempering.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a large-thickness chromium-molybdenum steel plate for hydrogenation equipment and a production method thereof. Background technique [0002] In recent years, the development of the petrochemical industry has mainly revolved around secondary deep processing of oil products and large-scale installations, marked by the application of hydrogenation technology. The service conditions of steel plates for hydrogenation equipment are harsh, and the steel plates have been exposed to high temperature, high pressure and hydrogen for a long time. Therefore, in addition to the basic mechanical properties at room temperature, the steel plate materials must also meet the strength at high temperature, resistance to temper embrittlement and hydrogen corrosion requirements. Due to the rapid development of my country's petrochemical industry and the large-scale equipment in recent years, t...

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Problems solved by technology

[0003] At present, only steel plates for hydrogenation equipment with a thickness of less than 100mm can be produced in China. When the thickness of the steel plate develops towards a larger thickness, the performance of various aspects will often be reduced. If the existing composition ratio and production method are maintained If the thickness of the steel plate is directly increased on the basis of the steel plate, the obtained large-thickness steel plate cannot meet the performance parameters set by the national standard GB713-2008. Therefore, the current priority is to optimize the composition ratio of the steel plate for hydrogenation equipment and improve the steel plate production method

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