Heat treatment method of forged piece of industrial steam turbine rotor

A technology of industrial steam turbines and heat treatment methods, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems that heat treatment methods cannot achieve, and achieve the effects of reducing tissue stress and thermal stress, reducing residual stress, and improving strength

Inactive Publication Date: 2016-11-09
HANGZHOU TURBINE POWER GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the production of rotor forgings requires heat treatment to ensure their strength and toughness, but the strength obtained by conventional heat treatment methods is 550 MPa. In order to adapt to market competition, reduce costs and increase efficiency, and improve unit efficiency, it is necessary to increase the strength of industrial steam turbine rotor forgings. , it is necessary to make its strength reach 670MPa level, but the existing heat treatment method cannot meet this requirement

Method used

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  • Heat treatment method of forged piece of industrial steam turbine rotor
  • Heat treatment method of forged piece of industrial steam turbine rotor
  • Heat treatment method of forged piece of industrial steam turbine rotor

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0028] In this embodiment, the industrial steam turbine rotor forging is as figure 1 The shaft diameter D shown is 1000mm, the material is 30CrMoNiV, the specific chemical composition is C: 0.28~0.34%, Si: ≤0.30%, Mn: 0.30~0.80%, P: ≤0.012%, S: ≤0.012%, Cr : 1.10-1.40%, Ni: 0.50-0.75%, Mo: 0.80-1.20%, V: 0.25-0.35%, Cu: ≤0.20%, Al: ≤0.01%, and the rest is Fe.

[0029] The heat treatment method of industrial steam turbine rotor forging in the present embodiment comprises the following steps:

[0030] (1), preparatory heat treatment (such as figure 2 shown):

[0031] a) Normalizing: Heat the industrial steam turbine rotor forgings in a bench-top heat treatment furnace using a stepwise heating method, from room temperature to 250-320°C for 6 hours, and then at a heating rate of <60°C / h to 700-720°C for heat preservation 3h, then quickly heated to 900-920°C and kept for 20h, after the heat preservation was completed, it was taken out of the furnace and air-cooled;

[0032] b)...

Embodiment 2

[0037] In this embodiment, the industrial steam turbine rotor forging is as figure 1 The shaft diameter D shown is 1100mm, and the material is 30CrMoNiV, which has the same chemical composition as that in Example 1. The heat treatment method of industrial steam turbine rotor forging in the present embodiment comprises the following steps:

[0038] (1), preparatory heat treatment (such as figure 2 shown):

[0039] a) Normalizing: Heat the industrial steam turbine rotor forgings in a bench-top heat treatment furnace using a stepwise heating method, from room temperature to 250-320°C for 6 hours, and then at a heating rate of <60°C / h to 700-720°C for heat preservation 3h, then rapidly heated to 900-920°C and kept for 22h, after the heat preservation was completed, it was taken out of the furnace and air-cooled;

[0040] b) Tempering: Heating the industrial steam turbine rotor forgings in a desktop heat treatment furnace, keeping it at 280-320°C for 10 hours, then heating at a h...

Embodiment 3

[0045] In this embodiment, the industrial steam turbine rotor forging is as figure 1 The shaft diameter D shown is 1300 mm, and the material is 30CrMoNiV, which has the same chemical composition as that in Example 1. The heat treatment method of industrial steam turbine rotor forging in the present embodiment comprises the following steps:

[0046] (1), preparatory heat treatment (such as figure 2 shown):

[0047] a) Normalizing: Heat the industrial steam turbine rotor forgings in a bench-top heat treatment furnace using a stepwise heating method, from room temperature to 250-320°C for 6 hours, and then at a heating rate of <60°C / h to 700-720°C for heat preservation 3h, then quickly heated to 900-920°C and kept for 26h, after the heat preservation was completed, it was taken out of the furnace and air-cooled;

[0048] b) Tempering: Heating the industrial steam turbine rotor forgings in a bench-top heat treatment furnace, keeping it at 280-320°C for 10 hours, then heating a...

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Abstract

The invention discloses a heat treatment method of a forged piece of an industrial steam turbine rotor. The heat treatment method comprises preheat treatment and quenching and tempering treatment. Preheat treatment comprises the steps of normalizing and tempering, and quenching and tempering treatment comprises the steps of quenching and tempering. During quenching of the quenching and tempering treatment, the temperature is raised in a ladder heating manner, a cooling manner of combining water cooling and oil cooling is adopted during cooling, and the tempering temperature and the cooling speed are decreased through tempering. The heat treatment method of the forged piece of the industrial steam turbine rotor is more reasonable in process, the large-diameter forged piece of the industrial steam turbine rotor can be treated, the obtained strength of the large-diameter forged piece of the industrial steam turbine rotor can reach the grade of 670 MPa, obdurability matching is better, and then the efficiency of an industrial steam turbine unit is improved.

Description

technical field [0001] The invention relates to the technical production field of industrial steam turbine rotor forgings, in particular to a heat treatment method for large-diameter industrial steam turbine rotor forgings with high strength requirements. Background technique [0002] With the increasingly prominent energy shortage and environmental protection pressure, the single unit capacity of industrial steam turbines is continuously increasing, and the requirements for unit efficiency are getting higher and higher. However, the rotors of industrial steam turbines work at high speeds, with complex stress conditions and harsh working environments. Industrial steam turbine rotor forgings have high quality requirements and require good strength and toughness. For large-diameter rotor forgings for industrial steam turbines, such as when the diameter D of industrial steam turbine rotor forgings is greater than 900mm, in order to ensure the hardenability of forgings, medium-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D6/00
CPCC21D9/0068C21D6/004
Inventor 刘中华黄淑秋何成郝明闪叶伟费海良王小倩
Owner HANGZHOU TURBINE POWER GRP
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