Heat treatment process for ultra-large type tube plate forge piece of pressure container

A pressure vessel and post-forging heat treatment technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as insufficient cooling, coarse structure and grain, and stress concentration

Active Publication Date: 2013-09-18
洛阳中创重型机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] (2) Insufficient cooling during performance heat treatment
After forging of 20MnMoNb low-alloy high-strength steel forgings, if the heat treatment process is improper, the mechanical properties of the material cannot be well improved, and the grains of the structure are coarse, which is likely to cause stress concentration in the subsequent welding process

Method used

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Embodiment Construction

[0033] The embodiments of the present invention are given to illustrate the present invention, but do not constitute any limitation to the present invention. The ultra-large tube sheet forging of the present invention refers to a tube sheet with a diameter greater than 6 meters, and the super-large tube sheet of the pressure vessel is made of 20MnMoNb steel;

[0034] Heat treatment after forging

[0035] The post-forging heat treatment of the forging adopts the technological process of normalizing + normalizing + high temperature tempering. Compared with the traditional 1-time normalizing + tempering post-forging heat treatment process, the grain size can be further refined, the grain size level can be increased to the greatest extent, and it can provide good conditions for the subsequent heat treatment of mechanical properties, which is conducive to improving the forging mechanical properties. The specific steps of post-forging heat treatment of the block forging are:

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Abstract

The invention relates to a heat treatment process for an ultra-large type tube plate forged piece of a pressure container and belongs to the technical field of large forged piece heat treatment processes. The heat treatment process comprises a forged heat treatment process and a performance heat treatment process, wherein normalizing, normalizing and high-temperature tempering are performed in the forged heat treatment process; quenching and high-temperature tempering are performed in the performance heat treatment process. Compared with a conventional one-time normalizing and tempering process, the heat treatment process has the advantages that through the forged heat treatment process in which the normalizing, normalizing and high-temperature tempering are performed, grains can be further refined and uniformized, the degree of grain size is improved, and good organization conditions are prepared for the subsequent heat treatment; through the performance heat treatment process in which quenching and high-temperature tempering are performed, good comprehensive performance indexes can be obtained.

Description

technical field [0001] The invention relates to a heat treatment process for a super-large tube plate of a pressure vessel of a petrochemical device, in particular to a heat treatment process for a super-large tube plate forging of a pressure vessel, and belongs to the technical field of heat treatment process for a large forging. Background technique [0002] A pressure vessel is a closed device that holds gas or liquid and carries a certain pressure. Reactors, heat exchangers, separators and storage containers are all pressure vessels. Pressure vessels are widely used in technology, and pressure vessels of various specifications are widely used in petroleum, natural gas, petrochemical and chemical industries. [0003] At present, many high-temperature, high-pressure, hydrogen corrosion, and ultra-high pressure key equipment such as nuclear pressure shells, large-scale hydrogenation reactors, EO / EG plant reactors and other pressure vessels are forged and welded. For examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00C21D9/00C21D1/28C21D1/18
Inventor 平志革雷静桃韩淑霞苏付勇
Owner 洛阳中创重型机械有限公司
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