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Heat treatment process after forging of ultra-heavy tube plate forgings splicing-welded in pressure container

A post-forging heat treatment and pressure vessel technology, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of not being able to improve the mechanical properties of materials, stress concentration, and coarse grains of the structure

Active Publication Date: 2013-10-09
洛阳中创重型机械有限公司
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Problems solved by technology

After forging of 20MnMoNb low-alloy high-strength steel forgings, if the post-forging 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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  • Heat treatment process after forging of ultra-heavy tube plate forgings splicing-welded in pressure container
  • Heat treatment process after forging of ultra-heavy tube plate forgings splicing-welded in pressure container

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Embodiment Construction

[0032] 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;

[0033] (1) Tube sheet segmentation

[0034] For super-large tube sheet forgings with a diameter of more than 6 meters, in order to improve the manufacturing quality stability of super-large tube sheets, the super-large tube sheets are divided into three pieces, namely arc-shaped block I1, rectangular block 2 and arc-shaped block II3, The arc-shaped block I1 and arc-shaped block II3 are concentric and have the same radius as the super-large tube sheet forging, the length of the rectangular block 2 is the same as the diameter of the super-large tube sheet forging, and the rectangular block 2 The two end faces in the lengt...

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Abstract

The invention belongs to technology for heat treatment process of heavy forgings and relates to heat treatment process after the forging of ultra-heavy tube plate forgings splicing-welded in a pressure container. An ultra-heavy tube plate is divided into three pieces for forging and shaping respectively, so that the sizes of steel ingots are reduced, the forging ratio is increased, the forging permeability is improved, and common internal defects of mingled cracks and so on are avoided; and the heat treatment process after the forging of the ultra-heavy tube plate forgings adopts the technological process of twice normalizing plus high-temperature tempering, so that compared with the traditional process of once normalizing plus high-temperature tempering, the heat treatment process has the advantages that grains are further refined and well-distributed, the grain fineness number is improved furthest, and favorable organizational conditions are prepared for subsequent thermal refining.

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 post-forging heat treatment process for a tailor-welded 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 fo...

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Application Information

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IPC IPC(8): C21D9/14C21D9/52C21D1/28C21D1/18
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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