A manufacturing method for quenching heat treatment of super-wide and extra-thick steel containment nuclear power steel

Abstract

The invention provides an ultra-wide and extra-thick steel containment nuclear power steel quenching heat treatment manufacturing method. The method adopts radiant tube heating under the protection of nitrogen to avoid surface oxidation of the steel plate; through precise control of the furnace temperature, the steel plate is evenly heated and ensured. Homogeneity of tissue performance. Through a reasonable heating temperature process, the austenite grains are increased, and carbides and other non-metallic inclusions are dissolved into the austenite, and at the same time, the composition is homogenized to improve the stability of the supercooled austenite, thereby improving the steel plate Hardenability. When the middle gun nozzle is opened, it cooperates with the side gun nozzle to spray water on the width direction of the steel plate to ensure the uniformity of cooling of the steel plate in the width direction. The partition cooling control process is matched with reasonable water volume, roll speed, roll gap and other process parameters to shorten the quenching steam film stage, prolong the convection stage and boiling stage, and improve the cooling capacity. Ensure the cooling uniformity of the steel plate in the thickness direction, and obtain a quenched martensite structure with excellent performance in the entire 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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