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Manufacturing process of large pressurized vessel pipe plate forging

A pressure vessel and manufacturing process technology, which is applied in the field of manufacturing process of large pressure vessel tube sheet forgings, can solve the problems of easy forging, low qualification rate, uneven internal deformation, etc. , the effect of mature technology

Active Publication Date: 2018-08-10
WUXI HONGDA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned technical problems, the present invention provides a manufacturing process of large-scale pressure vessel tube plate forgings to solve the problems of easy forging, low pass rate and uneven internal deformation in the production process existing in the existing technology. The manufacturing process of a kind of large-scale pressure vessel tube sheet forging specifically comprises the following steps:

Method used

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  • Manufacturing process of large pressurized vessel pipe plate forging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Before forging, place the forging billet in a heating furnace, heat it at a rate of 20°C / hour, so that the forging billet is slowly heated to 350°C, and heat it at a speed of 45°C / hour, so that the forging billet is slowly heated to 600°C ℃, the heating time is not less than 5 hours, and then heated at a speed of 60°C / hour, so that the forging billet is slowly heated to 910°C, and the heating time is not less than 3.5 hours, and then heated at a speed of 100°C / hour, so that the forging billet is slowly heated Rapidly heat to 1240°C to reach the forging temperature, and keep at this forging temperature for 16 hours.

[0033] The initial forging temperature during forging is 1250°C, and the final forging temperature is 800°C. The forging blank is forged by two times of upsetting + WHF method of drawing. The two times of upsetting and drawing are carried out on a 500-ton forging press. After reaching the initial forging temperature, start The first upsetting forging, that ...

Embodiment 2

[0036] Before forging, place the forging billet in a heating furnace and heat it at a rate of 25°C / hour to slowly heat the forging billet to 400°C. After heating to 400°C, heat the billet at a speed of 50°C / hour to slowly Heating rapidly to 650°C, the heating time is not less than 5 hours, and then heating at a speed of 80°C / hour, so that the forging billet is slowly heated to 930°C, the heating time is not less than 3.5 hours, and then heating at a speed of 100°C / hour , make the forging billet slowly heated to 1250°C, the heating time is not less than reaching the forging temperature, and keep at this forging temperature for 16 hours.

[0037] During the forging process, the initial forging temperature is 1250°C, and the final forging temperature is 800°C. The forging billet is forged by two times of upsetting + WHF method of drawing. The two times of upsetting and drawing are carried out on a 500-ton forging press. After reaching the initial forging temperature, Start the fi...

Embodiment 3

[0040] Before forging, place the forging billet in a heating furnace and heat it at a rate of 30°C / hour to slowly heat the forging billet to 450°C and heat it at a speed of 55°C / hour to slowly heat the forging billet to 700°C , the heating time is not less than 5 hours, and then heated at a speed of 100°C / hour, so that the forging billet is slowly heated to 950°C, the heating time is not less than 3.5 hours, and then heated at a speed of 100°C / hour, so that the forging billet is slowly heated Heating to 1260°C, the heating time is not less than reaching the forging temperature, and keeping at this forging temperature for 16 hours;

[0041] During the forging process, the initial forging temperature is 1250°C, and the final forging temperature is 800°C. The forging billet is forged by two times of upsetting + WHF method. The two upsetting and drawing processes are carried out on a 500-ton forging press. After reaching the initial forging temperature, Start the first upsetting f...

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Abstract

The invention provides a manufacturing process of a large pressurized vessel pipe plate forging, and belongs to the field of large forging heat treatment processes. The manufacturing process of the large pressurized vessel pipe plate forging comprises the concrete steps of carrying out forged heat treatment, forging, and carrying out heat treatment after forging. The process provided by the invention is mature, and conveniently solves the problems that during a production process, forging is easy to occur, the acceptability is lower, and the internal deformation is nonuniform. The steps of heat treatment after forging comprise pretreatment, isothermal bainite treatment for the first time, pre-heat treatment for the first time, normalizing treatment for the first time, bainite treatment forthe second time, pre-heat treatment for the second time, normalizing treatment for the second time, bainite treatment for the third time, and hydrogen relief treatment, so that white points in the forging can be effectively removed, grains are refined, and the strength of the forging is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of heat treatment technology for large forgings, and in particular relates to a manufacturing process for tube plate forgings of large pressure vessels. Background technique [0002] A pressure vessel refers to a closed device that contains 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 example, a large-scale ethylene reactor adopts a super-large fixed tube-sheet thick-walled heat exchanger, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/08B21J5/00C21D1/20C21D1/28C21D8/00
CPCB21J1/06B21J5/002B21J5/08C21D1/20C21D1/28C21D8/005
Inventor 张瑞庆张忠明张伟东王忠安马晗珺
Owner WUXI HONGDA HEAVY IND
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