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
CN106086360AInactive Publication Date: 2016-11-09HANGZHOU TURBINE POWER GRP +1
3 Cites 5 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HANGZHOU TURBINE POWER GRP
Publication Date
2016-11-09
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More