Pressure vessel steel resistant to acid corrosion at medium temperature of 600 DEG C and preparation method thereof

Abstract

The invention discloses pressure vessel steel resistant to acid corrosion at medium temperature of 600 DEG C and a preparation method thereof. The pressure vessel steel comprises 0.05-0.15% of C, 0.20-0.50% of Si, 0.50-1.00% of Mn, 0.008% or less of P, 0.002% or less of S, 0.050% of less of Alt, 0.30-0.80% of Cu, 0.30-1.00% of Ni, 0.80-1.50% of Cr, 0.20-0.50% of Mo, 0.01-0.05% of V, 0.0070% or less of N and the balance Fe and unavoidable impurities. During preparation, the mass percentage of the chemical components is adjusted in a molten iron tank first, aluminum wires are added into an LF furnace and a RH furnace and continuously cast into a casting blank, the casting blank is rolled in two stages including rough rolling and finishing rolling, then subjected to heat treatment of normalization and tempering and finally cooled, and the pressure vessel steel is obtained. Through composition design, inclusion control, rolling and heat treatment, the obtained pressure vessel steel has good toughness, a low yield ratio and good welding performance and can be used for supercritical thermal power, high-efficiency boilers, nuclear power and other industries.

Description

technical field [0001] The invention relates to the technical field of low-alloy steel manufacturing, in particular to a 600°C medium-temperature acid-resistant corrosion-resistant pressure vessel steel and a preparation method thereof. Background technique [0002] At present, similar technical products in the field of acid-resistant corrosion pressure vessel steel manufacturing mainly adopt Cr-Mo series steel grades in the GB / T713-2014 standard in China, such as 15CrMoR, 14Cr1MoR, 12Cr2Mo1R, etc., but the service temperature of the above-mentioned types of steel is limited to 500 ℃, and the acid corrosion resistance is low, far from meeting the design requirements. [0003] The Chinese invention patent application number is CN201710971946.6, which discloses a low-alloy high-strength steel plate for corrosion resistance and a production method. The chemical composition and mass percentage of the steel plate are: C 0.07-0.10%, Si 0.30-0.40% , Mn 0.65~0.85%, P≤0.010%, S≤0.00...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem that the service temperature of the current acid corrosion-resistant pressure vessel steel is limited within 500°C, and the acid corrosion resistance is too low to meet the design requirements. Preparation

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