Steel quenching heat treatment manufacturing method for super-wide extremely-thick steel containment shell nuclear power

Abstract

The invention provides a steel quenching heat treatment manufacturing method for super-wide extremely-thick steel containment shell nuclear power. According to the method, radiant tube heating is adopted under protection of nitrogen, and the surface of a steel plate is prevented from being oxidized; and through precise control over the furnace temperature, heating of the steel plate is guaranteedto be uniform, and homogeneity of structure property is guaranteed. Through reasonable heating temperature technology, austenite grain is promoted to increase, and carbides and other non-metallic inclusions are dissolved into austenite; and meanwhile, components are homogenized, stability of supercooled austenite is improved, and thus hardenability of the steel plate is improved. Middle gun spraying nozzles are opened, and meanwhile, water spraying cooling is conducted in the width direction of the steel plate with cooperation of side gun spraying nozzles, and cooling homogeneity of the steelplate in the width direction is guaranteed. By means of the partitioned cooling control technology, together with technological parameters such as reasonable water amount, the roller speed and the roller gap, the quenching steam membrane stage is shortened, the convection current stage and the boiling stage are prolonged, and the cooling capacity is improved. Cooling homogeneity of the steel platein the thickness direction is guaranteed, and quenching martensitic structures with outstanding properties are acquired in the through-thickness direction.

Description

technical field [0001] The invention relates to a steel for nuclear power, in particular to a method for manufacturing super-wide and extra-thick steel containment steel for nuclear power by quenching heat treatment. Background technique [0002] Nuclear energy has come a long way in just over 60 years since the world's first reactor was successfully operated. With the continuous development of related nuclear technology, the safety requirements for the operation of nuclear power equipment are getting higher and higher, which brings about the upgrading of steel plate specifications. However, after the size of the steel plate increases, the relevant production process cannot be applied to the new technical requirements, especially in the quenching heat treatment technology, which is mainly reflected in the following two points: 1. The cooling capacity of the existing quenching heat treatment technology is insufficient, and it is impossible to use ultra-wide and extra-thick st...

AI Technical Summary

Problems solved by technology

However, after the size of the steel plate increases, the relevant production process cannot be applied to the new technical requirements, especially in the quenching heat treatment technology, which is mainly reflected in the following two points: 1. The cooling capacity of the existing quenching heat treatment technology is insufficient, and it is impossible to use ultra-wide and extra-thick steel plates. The plate is completely hardened and is not suitable for the production of steel plates of this specification

2. After the ultra-wide and extra-thick plate is quenched, the performance is not uniform in the thickness and width directions, and the homogeneity of the steel plate performance needs to be solved urgently

[0004] However, this invention aims to solve the problem of quenching technology for thick plates, but it has no relevant guiding significance for the quenching technology of ultra-wide and extra-thick plates, and cannot solve the existing problems

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