Ultrathick normalizing high-intensity pressure container steel plate and production method thereof

Abstract

The invention discloses an ultrathick normalizing high-intensity pressure container steel plate and a production method thereof. The ultrathick normalizing high-intensity pressure container steel plate is prepared from 0.19 to 0.22 percent of C, 0.25 to 0.60 percent of Si, 1.45 to 1.60 percent of Mn, smaller than and equal to 0.010 percent of P, smaller than and equal to 0.005 percent of S, 0.030to 0.040 percent of Nb, 0.20 to 0.30 percent of Ni, 0.020 to 0.030 percent of Ti, 0.010 to 0.020 percent of V, 0.20 to 0.30 percent of Cr, 0.015 to 0.3 percent of Cu, 0.020 to 0.045 percent of Alt andthe balance of Fe and unavoidable impurities. The thickness of the steel plate is 180 to 250 mm; the normalizing state thickness 1 / 2 position tensile intensity Rm is greater than or equal to 600 Mpa;the simulated post-welding heat treatment state steel plate thickness 1 / 2 tensile intensity Rm is greater than or equal to 550 Mpa.

Description

technical field [0001] The invention belongs to the field of iron and steel products, and in particular relates to an extra-thick normalized high-strength pressure vessel steel plate and a production method thereof. Background technique [0002] With the rapid development of my country's petroleum, petrochemical and other industries, under the guidance of the national coastal energy reserve strategy, the market demand for the thickness and strength of pressure vessel steel continues to increase, which puts forward pressure vessel steel production units. In order to meet higher requirements, the existing production process needs to be improved urgently. Among them, P355GH is the pressure vessel grade in the European standard. Because of its low production cost, high strength and good welding performance, it has been widely used in the manufacture of boiler and pressure vessel equipment, and has very broad market demand at home and abroad. At present, domestic production of P3...

AI Technical Summary

Problems solved by technology

No Cr element is added to the above-mentioned invention components, which cannot improve the strength and thermal strength of the steel plate in the as-rolled state, so that it cannot ensure that the steel plate has good mechanical properties after normalizing and simulated post-weld heat treatment.

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