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Manufacturing method of valve part

A manufacturing method and technology of parts, applied in the field of structural design of valves, can solve problems such as high mechanical properties, metallographic flaw detection requirements, affecting the development of steam turbines, and small forging temperature range, so as to avoid central cracks, cracking, and deformation resistance Strong, guaranteed eligibility effect

Active Publication Date: 2011-04-20
上海腾辉有色铸造有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high technical requirements, complex process, and special material properties of the nickel-based high-temperature alloy valve disc and stem, including: 1. The high-temperature deformation resistance is 6-8 times that of ordinary alloy steel; 2. The forging temperature range is small (120°C-200°C ℃), 3. High requirements for mechanical properties, metallographic structure, and flaw detection. 4. High scrap rate. For a long time, the manufacturing technology has been monopolized by foreign companies and can only rely on foreign imports, which has seriously affected the development of my country's steam turbine industry and domestic production. the process of

Method used

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  • Manufacturing method of valve part

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Effect test

Embodiment 1

[0024] (1) Take the electroslag remelting ingot blank with a diameter of 480mm for forging, and open the billet to a diameter of 300mm. The forging ratio is ≥ 2.5 when the billet is opened, and then it is polished and finished. After the flaw detection, the blank is ready for the second stage forging;

[0025] (2) Heat the above blank to 1150°C, keep it warm for 90 minutes, and then perform upsetting, elongating, upsetting, elongating, chamfering, splitting, elongating and rounding of the billet, the total forging ratio is > 5, and Classified forging according to the shape, the last reserved deformation is more than 20%, and the finished part is locally heated and wrapped with high-temperature cotton into the furnace or partially heated, the heating temperature is reduced to 1060 ° C, and the holding time is ≤ 0.25 min per 1 mm section;

[0026] (3) Process the obtained blank, and perform ultrasonic flaw detection inspection, and carry out 100% inspection according to 3b-3c in...

Embodiment 2

[0037] (1) Take the electroslag remelting ingot blank with a diameter of 480mm for forging, and open the billet to a diameter of 300mm. The forging ratio is ≥ 2.5 when the billet is opened, and then it is polished and finished. After the flaw detection, the blank is ready for the second stage forging;

[0038] (2) Heat the above-mentioned blank to 1140°C, keep it warm for 90 minutes, and then carry out upsetting, drawing, upsetting, drawing, chamfering, splitting, drawing and rounding of the blank. The total forging ratio is >5, And graded forging according to the shape, the last reserved deformation is more than 20%, and the finished part of the local heating is wrapped with high-temperature cotton into the furnace or partially heated, the heating temperature is reduced to 1050 ° C, and the holding time is ≤ 0.25 min per 1 mm section;

[0039] (3) Process the obtained blank, and perform ultrasonic flaw detection inspection, and carry out 100% inspection according to 3b-3c in ...

Embodiment 3

[0045] (1) Take the electroslag remelting ingot blank with a diameter of 480mm for forging, and open the billet to a diameter of 300mm. The forging ratio is ≥ 2.5 when the billet is opened, and then it is polished and finished. After the flaw detection, the blank is ready for the second stage forging;

[0046] (2) Heat the above blank to 1140-1160°C, keep it warm for 90 minutes, and then perform upsetting, elongating, upsetting, elongating, chamfering, splitting, elongating and rounding of the billet, the total forging ratio > 5. Forging in stages according to the shape, the last reserved deformation is > 20%, local heating has been finished with high-temperature cotton wrapped into the furnace or local heating, the heating temperature is reduced to 1080 ° C, and the holding time is ≤ 0.25 min per 1 mm section;

[0047] (3) Process the obtained blank, and perform ultrasonic flaw detection inspection, and carry out 100% inspection according to 3b-3c in Table 2 of EN 10228-4 sta...

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Abstract

The invention relates to a manufacturing method of a valve part, and the method comprises the following steps: forging electroslag remelting ingot billets, cogging, polishing, finishing carrying out flaw detection and blanking; heating the billets to 1140-1160 DEG C, preserving heat again for 90 minutes, and carrying out upsetting, drawing down, upsetting, drawing down, chambering, billet separation, drawing down and rounding forming treatments on the billets; carrying out flaw detection on the obtained billets; and finally, carrying out solution treatment, air cooling stabilized treatment and age-hardening treatment on a sample. Compared with the prior art, the invention has the advantages that the eligibility of the billets is ensured, the risk brought by carrying out normal forging once is lowered, the inner and outer temperature difference of the billets is reduced, scrap caused by unreasonable heating is solved, the phenomena of centre burst and crack of a forging are avoided, the yield is improved, and the eligibility of the obtained forgings is more than 98%.

Description

technical field [0001] The invention relates to a structural design of a valve, in particular to a manufacturing method of a valve part. Background technique [0002] The valve stem material (NiCr20TiAl) is an important part of the turbogenerator set to adjust the intake air volume, ensuring the safe operation of the unit. With the continuous progress of the steam turbine manufacturing industry, ultra-supercritical units have been adopted in the steam turbine power generation industry in the world, which reduces a lot of energy loss and improves the power generation efficiency of steam turbines. With the emergence of ultra-supercritical units, the inlet temperature and pressure of steam turbines have been greatly increased, and the material for manufacturing valve discs and stems has been changed from the original martensitic stainless steel to nickel-based superalloys (use temperature > 650 ° C), ensuring that the steam turbine Normal work requirements and safety requir...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21K1/20B21J1/06C21D10/00C21D9/00C22F1/10
Inventor 李根宝李军
Owner 上海腾辉有色铸造有限公司
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