Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel

A post-forging heat treatment, ultra-supercritical technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of uneven grain size, coarse grains, mixed crystals, etc., and achieve uniform internal and external structures of forgings , Austenitization effect is good, the effect of eliminating forging stress

Active Publication Date: 2010-09-15
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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Problems solved by technology

[0003] Forgings processed according to the above process can ensure machining and cutting performance, but their grains are coarse, the attenuation coefficient of flaw detection cannot meet the requirements of flaw detection, and the internal structure of "troostite-like" network or flocculation affects the performance of the workpiece.
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  • Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel
  • Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel
  • Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel

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Embodiment Construction

[0017] Such as figure 2 As shown, the post-forging heat treatment method of ultra-supercritical high and medium pressure rotor steel of the present invention adopts the following method to carry out post-forging heat treatment to X12CrMoWVNbN10-1-1 and Cr10.5Mo1W1NiVNbN ultra-supercritical unit high and medium pressure rotor steel:

[0018] The first step, austenite homogenization treatment: After the final forging of the forging is completed (at this time, the temperature of the forging is about 900°C, and the temperature of the core is about 1000°C), without air cooling, the forging is directly placed in a waiting room with a temperature of 950±10°C. Material furnace, heat preservation at a heating rate of ≤50℃ / h to 1050±10℃, and the holding time is 0.5~1h / 100mm (that is, for a forging with a diameter of 100mm, keep it for 0.5~1 hour, and for a forging with a diameter of 1200mm 6 to 12 hours), homogenize the austenite structure, eliminate the forging stress, adjust the grai...

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Abstract

The invention discloses a heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel. The heat treatment after forging of ultra-supercritical high and medium pressure unit rotor steel X12CrMoWVNbN10-1-1 and Cr10.5Mo1W1NiVNbN is carried out by the steps of: step 1. austenite homogenization treatment; step 2. carrying out structural transformation when balanced structure transformation temperature is reached by air cooling; step 3. overall structure softening; and step 4. cooling in a speed limit furnace till discharging. Since the rotor steel is directly put into the furnace for austenization after being forged, the invention has the advantages of short time and good austenite effect, not only eliminates the forging stress, but realizes the homogenization of inner and outer structures of forging. The heat treatment method after forging has the advantages of simple operation, low cost and low energy consumption, and can meet the property requirement of workpieces.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a post-forging heat treatment method for ultra-supercritical high-medium pressure rotor steel. Background technique [0002] For large-section, large-tonnage ultra-supercritical and high-pressure rotor steel, the traditional post-forging heat treatment process, such as figure 1 As shown, when air cooling to 680-780°C after forging, put it into a 690°C waiting furnace, and then keep it at 690°C for 200 hours to transform the structure, and then cool it to 240°C at ≤8°C / h, and keep it fully Transformation, and then raised to 720 ° C for 22 hours to soften the overall structure, and finally furnace cooling to 180 ° C at ≤ 8 ° C / h to complete the post-forging heat treatment. [0003] The forgings processed according to the above process can ensure the machinability and cutting performance, but their grains are coarse, the attenuation coefficient of flaw detection cannot meet the require...

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Application Information

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IPC IPC(8): C21D9/00C21D1/26C21D1/32
Inventor 胡朝备潘胜谢培德宋雷钧马明方吕政陆寅松
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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