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Forging changing process for tube plate forge piece

A technology for forgings and tube sheets, which is applied to the field of forging process of tube sheet forgings, can solve problems such as increasing costs and wasting resources, and achieves the effects of reducing scrap, saving resources and reducing costs.

Pending Publication Date: 2022-05-10
SHANDONG IRAETA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the tube plate forging is a solid forging, the central part of the tube plate forging usually has macroscopic defects such as metallurgy, porosity and shrinkage cavity during the forging process, so the tube plate forging cannot meet the requirements of ultrasonic testing and is scrapped, which increases the cost. , a waste of resources

Method used

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  • Forging changing process for tube plate forge piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the die-cast steel ingot is used as the raw material for the tube sheet forging.

[0037] Die-cast steel ingots are used as castings, and there are defects such as porosity and shrinkage cavities inside. Defects such as porosity and shrinkage cavity are common defects in castings, especially in the central part of the casting, which is a high-incidence area for defects such as porosity and keyholes.

[0038] In order to improve the internal defects of the die-cast steel ingot, it is necessary to carry out the following forging process on the die-cast steel ingot to obtain the tube plate forging. After the tube plate forgings are obtained, ultrasonic testing is required to determine which tube plate forgings are unqualified and need to be re-forged, and which tube-sheet forgings are qualified and do not need to be re-forged.

[0039] The specific steps of forging the die-cast steel ingot are as follows:

[0040] (1) Heating die-cast steel ingots: In...

Embodiment 2

[0050] After the ultrasonic testing in Example 1, the tube sheet forgings with defects in the central part will be detected. The modified forging process of the tube plate forging provided in Embodiment 2 can improve the defect in the central part of the tube plate forging.

[0051] A tube plate forging reforging process, comprising the following steps:

[0052] (1) Heated tube sheet forgings: In order to facilitate the forging of tube sheet forgings with defects in the central part, it is necessary to use heating equipment to heat the tube sheet forgings. The plasticity of the heated tube sheet forgings is improved, which can make the tube sheet forgings easier to be forged.

[0053] Specifically, a gas heating furnace can be used to heat the tube plate forging.

[0054] Specifically, the heating temperature is 1220-1280°C. In this heating temperature range, it is more beneficial to increase the activity of atoms, so that it is more conducive to welding defects in the next ...

Embodiment 3

[0085] A batch of SA508-3 tube-sheet forgings forged by our company (namely the applicant) were ultrasonically inspected, and found that there were continuous dense defects in the center of some tube-sheet forgings in the area of ​​about Φ600mm, which exceeded ASMEⅧDiv. 2 standard requirements, leading to the invalidation of tube plate forgings.

[0086] The outer diameter of this batch of tube plate forgings is 3300mm, the height is 260mm, and the blanking weight is 18.5 tons. In order to reduce scrap loss, adopt the modified forging process in embodiment 2 to carry out modified forging, concrete steps are as follows:

[0087] (1) Heated tube-sheet forgings: Use a gas heating furnace to heat the discarded tube-sheet forgings at a heating temperature of 1250°C and a holding time of 4h (A=1h / 100mm, D=260mm, A×D=2.6h, whichever is greater than or equal to 2.6 The numerical value of h, present embodiment gets 4h).

[0088] (2) Forging deformation: Use hydraulic press to forge t...

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PUM

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Abstract

The invention discloses a process for forging a tube plate forge piece. The process comprises the following steps: (1) heating the tube plate forge piece with internal defects by using heating equipment; (2) the surface of the heated tube plate forge piece is covered with a heat preservation layer, forging and pressing equipment is used for forging and pressing the tube plate forge piece, when the forging and pressing equipment is used for forging and pressing the tube plate forge piece every time, the height deformation of the tube plate forge piece needs to be larger than or equal to 10%, the pressure maintaining time needs to be larger than or equal to 10 min, and internal defects of the tube plate forge piece are welded; (3) heating the forged and pressed tube plate forge piece by using heating equipment, so that atoms at the welding position in the tube plate forge piece are diffused, and cooling after heating is completed; and (4) carrying out post-forging heat treatment on the cooled tube plate forge piece. By means of the method, the tube plate forge piece with the macroscopic defects such as looseness and shrinkage cavities in the center can be forged, the macroscopic defects such as looseness and shrinkage cavities are formed and welded, the defects are improved, scrapping is reduced, cost is reduced, and resources are saved.

Description

technical field [0001] The invention relates to the technical field of thermal processing technology for tube plate forgings, in particular to a reforging process for tube plate forgings. Background technique [0002] Tube sheet forgings are solid forgings. Tube sheet forgings are mainly used in pressure vessel equipment, and the main function of tube sheet forgings is to support and fix the tubes in pressure vessel equipment. [0003] Large-scale tube-sheet forgings usually use die-cast steel ingots as raw materials. The die-cast steel ingots used as raw materials need to go through metallurgical and forging processes to obtain tube-sheet forgings. Since the tube plate forging is a solid forging, the central part of the tube plate forging usually has macroscopic defects such as metallurgy, porosity and shrinkage cavity during the forging process, so the tube plate forging cannot meet the requirements of ultrasonic testing and is scrapped, which increases the cost. , wasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21K1/26B21K29/00B21C51/00
CPCB21J1/06B21K1/26B21K29/00B21C51/00
Inventor 银伟任秀凤赵芳娜刘允良李玲赵兴明刘兰潇刘丹丹韩梅梅曹伟飞
Owner SHANDONG IRAETA HEAVY IND