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Short-process forging method for nuclear power main pipe blank

A main pipeline and short process technology, applied in the direction of metal processing equipment, etc., can solve the problems of increasing process steps and forging difficulty, and achieve the effect of improving surface quality, reducing forging cost, and reducing forging fire times

Active Publication Date: 2016-01-20
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus increasing the process steps and forging difficulty

Method used

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  • Short-process forging method for nuclear power main pipe blank
  • Short-process forging method for nuclear power main pipe blank
  • Short-process forging method for nuclear power main pipe blank

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] A short-process forging method for a nuclear power main pipe blank, comprising the following steps:

[0028] A. Select the steel ingot 1, and remove the surface defect layer of the steel ingot 1 before heating the steel ingot 1;

[0029] B. Slowly heat the steel ingot 1 to 800±10°C, keep it warm for 5 hours, then quickly heat it to 1220±10°C, and keep it warm for 20 hours; use the upper flat anvil and the lower V anvil to press the steel ingot 1; After the process is completed, the ingot body of the steel ingot 1 is rounded once with a small reduction; the slow heating means that the temperature rise rate is less than 40°C / h, and the fast heating means that the temperature rise rate is 40°C / h. ~100℃ / h;

[0030] C. Upsetting, elongating, and inverting in all directions; quickly heat the steel ingot 1 to 1220±10°C, keep it warm for 5 hours, and u...

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Abstract

The invention discloses a short-process forging method for a nuclear power main pipe billet channel. The short-process forging method reduces forging difficulty and forging heating number and comprises the steps as follows: A, selecting steel ingots and removing damage of the steel ingots; B, pressing a plier handle and rolling; C, upsetting, swaging and octagonally forging; D, rolling, distributing and swaging; and E, locally upsetting a flange at a pipe mouth, and discharging a finished product. With the adoption of the method, the main pipe mouth part is subjected to local covering and local upsetting for forming, the forging difficulty and the forging heating number are reduced, the forging cost is reduced, and the forging efficiency is improved; meanwhile, the forge piece surface cracking is prevented from aspects of steel ingot surface quality, plier handle and end surface transition fillet, end surface inclination, forge piece water gap reservation, small rolling reduction forming, flame damage removing after forging and the like; and with the adoption of small rolling reduction forming, the forge piece surface quality is improved.

Description

technical field [0001] The invention relates to the field of free forging forming of nuclear power main pipe blanks, in particular to a short-flow forging method for nuclear power main pipe blanks. Background technique [0002] Known: AP1000 pressurized water reactor nuclear power technology is the third generation of large nuclear power plant designed by Westinghouse Corporation of the United States. Its main feature is that the service life can reach 60 years, and the installed capacity of a single reactor can reach 1.25 million kilowatts. The main pipe is a large thick-walled pressure pipe connecting the reactor pressure vessel and the steam generator, and is a key component of the nuclear island. The main pipeline of nuclear power is an integrated large-diameter elbow with a nozzle, which is integrally forged from ultra-low carbon austenitic stainless steel, which is difficult to process and requires high quality. At present, the main forging process is to forge the noz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/08B21J5/06
Inventor 门正兴余江山侯少卿赵欣
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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