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Preparation method of high-temperature alloy free forging bar billet for ultra-supercritical thermal power generating unit

A technology of thermal power units and high-temperature alloys, applied in metal processing equipment, manufacturing tools, heating/cooling equipment, etc., can solve problems such as easy crack formation, scrapped pipes, unevenness, etc., and achieve the goal of improving grain size and structure uniformity Effect

Pending Publication Date: 2022-06-17
西安聚能高温合金材料科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The forged billet still needs to be extruded, and there are aggregated or large-sized primary carbides in the material, coupled with coarse or uneven structures, cracks are easily formed during the extruding process, resulting in the scrapping of the pipe

Method used

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  • Preparation method of high-temperature alloy free forging bar billet for ultra-supercritical thermal power generating unit
  • Preparation method of high-temperature alloy free forging bar billet for ultra-supercritical thermal power generating unit
  • Preparation method of high-temperature alloy free forging bar billet for ultra-supercritical thermal power generating unit

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Experimental program
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Effect test

Embodiment

[0028] The diameter of the superalloy ingot for ultra-supercritical thermal power unit smelted by vacuum induction melting + vacuum consumable remelting process is 490mm. The ingot homogenization process is as follows: heating to 700 ° C, holding for 300 min, and then heating at 5 ° C / min The temperature was raised to 1150°C, the holding time was 24h, and then the temperature was raised to 1195°C at a heating rate of 5°C / min, and the holding time was 48h.

[0029] After the ingot is kept at 1120-1170 ℃, the billet is opened, and the billet is forged for a total of 2 fires. The first fire is upsetting, and the second fire is drawn and upsetting. The deformation settings are as follows: Φ490×1400→Φ610×930→Bafang 550× 1050→Bafang 700×650, the deformation amount of the first fire is 35%, the deformation amount of the drawing and upsetting in the second fire is 14% and 38%, respectively. After completion, the hot material is returned to the furnace.

[0030] After the billet is kep...

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Abstract

The invention provides a preparation method of a high-temperature alloy free forging bar billet for an ultra-supercritical thermal power generating unit. A high-temperature alloy ingot for the ultra-supercritical thermal power generating unit at the temperature of 650 DEG C is obtained through double vacuum smelting of vacuum induction melting and vacuum consumable remelting; performing homogenizing heat treatment; cogging forging is carried out in a 80MN fast forging machine, upsetting and drawing are carried out for two heating numbers, and the deformation amount of each heating number is 30%-50%; continuous remelting and reversing drawing-out are carried out for two heating times, and the deformation amount of each heating time is 30%-60%; 3, heating number drawing deformation is conducted, the deformation amount ranges from 30% to 50%, and the diameter of the blank is 220 mm after drawing is completed; and obtaining the high-temperature alloy blank with the diameter of 204 mm for the ultra-supercritical thermal power generating unit. According to the method, the high-temperature alloy bar billet is prepared by adopting a reversing drawing free forging technology, so that the bar billet is uniform and fine in structure, fine in carbide and dispersed in distribution, the material can be used for a 650-DEG C ultra-supercritical thermal power generating unit, the production efficiency is improved, and greenhouse gas emission is reduced.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal processing, in particular to a method for preparing a superalloy free forging bar blank for an ultra-supercritical thermal power unit. Background technique [0002] The development of ultra-supercritical coal-fired power generation technology is conducive to solving the problems of energy and greenhouse gas emissions. Increasing the temperature and pressure of steam is an important means to improve the thermal efficiency of thermal power generation units. However, the ever-increasing steam parameters have brought great challenges to high-temperature materials for boiler pipes. Therefore, the development and manufacture of the next-generation ultra-supercritical thermal power superalloys has become very important and urgent. [0003] The highest temperature of the thermal power unit currently in service is 600°C, and the superalloy used in the present invention can be used for a 650°C ul...

Claims

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Application Information

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IPC IPC(8): B21J5/06C22B9/18C22B9/04C22F1/10B21K29/00
CPCB21J5/06C22B9/18C22B9/04C22F1/10B21K29/00
Inventor 孙明煜史新波孙阳辉李思君徐文梁陈闽俊曹国鑫阚志付宝全
Owner 西安聚能高温合金材料科技有限公司
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