Large-thickness 14Cr1MoR steel plate and production method thereof

Abstract

The invention discloses a large-thickness 14Cr1MoR steel plate and a production method thereof. The large-thickness 14Cr1MoR steel plate comprises the following chemical components in percentage by mass: 0.12-0.14% of C, 0.5-0.6% of Si, 0.40-0.50% of Mn, 0.006-0.007% of P, equal to or less than 0.005% of S, 1.3-1.5% of Cr, 0.58-0.60% of Mo, 0.10-0.20% of Ni, equal to or less than 0.05% of Nb, equal to or less than 0.20% of Cu, equal to or less than 0.003% of Sb, equal to or less than 0.010% of Sn, equal to or less than 0.010% of As and the balance of Fe and unavoidable impurities. The production method comprises the procedures of smelting, continuous casting, heating, rolling and thermal treatment. According to the production method, the two-stage rolling control technology and the thermaltreatment technology of normalizing and tempering are adopted to solve the problems that the crystal particles are thick, non-uniform, lower in impact toughness and higher in hardness, and the head performance and the tail performance of the steel plate differ widely.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a large-thickness 14Cr1MoR steel plate and a production method thereof. Background technique [0002] With the rapid development of the national economy, the consumption of petroleum in various industries continues to increase, which has accelerated the development of large-scale petrochemical equipment. The petrochemical industry and the coal chemical industry have a substantial increase in the demand for large-thickness Cr-Mo steel plates with a thickness of more than 100mm. Since the refining unit is under high temperature, high pressure and hydrogen exposure conditions for a long time, Cr-Mo steel plate needs to meet the requirements of strength at high temperature, resistance to temper embrittlement and hydrogen corrosion in addition to basic mechanical properties at room temperature. Because of the very strict requirements on the material itself, only a few f...

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Problems solved by technology

Because of the very strict requirements on the material itself, only a few foreign manufacturers such as Arcelor in France and JFE in Japan can produce it. In the past, all domestic companies relied on imports. On the one hand, the procurement cycle lasted for more than 8 months, prolonging the equipment manufacturing cycle; on the other hand On the one hand, the import price is as high as 50,000 yuan / ton, which increases the procurement cost and restricts the development of my country's petrochemical industry

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