Steel plate for large-thickness hydrogen-contacting equipment and its production technology

Abstract

The invention relates to a steel plate used for a large-thickness hydro-device which belongs to the technical field of steel-making. Counted by weight percentage, the steel plate consists of the following elements: 0.13 to 0.15 percent of C, equal to less than 0.10 percent of Si, 0.50 to 0.60 percent of Mn, equal to or less than 0.008 percent of P, equal to or less than 0.007 percent of S, 0.14 to 0.18 percent of Ni, 2.30 to 2.50 percent of Cr, equal to or less than 0.15 percent of Cu, 0.95 to 1.10 percent of Mo, 0.015 to 0.020 percent of Nb, 0.010 to 0.020 percent f Ti, 0.020 to 0.045 percent of Al, equal to or less than 0.016 percent of As, equal to or less than 0.015 percent of Sn, equal to or less than 0.003 percent of Sb and the rest is Fe as well as unavoidable impurities. The delivery state of the steel plate is normalizing plus annealing; the quality of the steel is pure; the capacity for resisting the corrosion of hydrogen is excellent; besides, the steel plate has excellent weldability and comprehensive mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and mainly relates to a large-thickness steel plate for hydrogen-facing equipment and a production process thereof. Background technique [0002] Since the 1960s, 2 1 / 4Cr-1Mo steel has been widely used in hydrogen equipment, and my country mainly relies on imports. Due to the long-term high temperature, high pressure, and hydrogen exposure, the equipment material is prone to temper embrittlement, and considerable hydrogen diffuses, penetrates, and dissolves in the steel, causing damage to the steel. The damage of high-temperature and high-pressure hydrogen to steel is mainly because hydrogen penetrates into the metal in an atomic state and recombines into molecules inside the metal, resulting in high pressure, which will cause bulges, wrinkles or cracks in severe cases; hydrogen and steel in Combine carbon to decarburize steel; reduce sulfide and oxide in steel. The 2.25Cr-1Mo steel used to...

AI Technical Summary

Problems solved by technology

However, as far as the current domestic production technology equipment and process technology are concerned, it is difficult to guarantee the performance of the steel plate with a thickness exceeding 120mm, and cannot meet the growing demand of the thick plate market, mainly relying on imported products for supply

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