Heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel bar

A heat treatment method and technology of a heat treatment furnace, applied in the field of heat treatment, can solve the problems of difficult control of process parameters and high cost, and achieve the effect of simple steps, low cost and easy realization

Inactive Publication Date: 2020-01-17
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method involves the addition of rare earth elements,

Method used

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  • Heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel bar
  • Heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel bar
  • Heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel bar

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0020] Example 1:

[0021] A heat treatment method for improving high temperature durability of 10Cr11Co3W3NiMoVNbNB blade steel, comprising the following steps:

[0022] (1) Annealing treatment: The 10Cr11Co3W3NiMoVNbNB blade steel bar with Ф150mm after forging is directly put into the furnace at 750℃ for heat preservation, and the heat preservation time is 13h;

[0023] (2) Austenitizing treatment: the above annealed steel is below 500°C, heated to 1090°C at a heating rate of 110°C / h, and the holding time is 4.5h;

[0024] (3) Oil quenching;

[0025] (4) Tempering treatment: the above-mentioned oil-quenched blade steel is directly put into a furnace at 750°C for heat preservation, the heat preservation time is 7.5h, and then it is air-cooled to room temperature to obtain product A, whose metallographic diagram is shown in figure 1 , the grain size is 5.5, and the morphology of the precipitate is as follows figure 2 As shown, the precipitates did not aggregate.

Example Embodiment

[0026] Example 2:

[0027] A heat treatment method for improving high temperature durability of 10Cr11Co3W3NiMoVNbNB blade steel, comprising the following steps:

[0028] (1) Annealing treatment: The 10Cr11Co3W3NiMoVNbNB blade steel bar with Ф120mm after forging is directly put into the furnace at 740℃ for heat preservation, and the heat preservation time is 10h;

[0029] (2) Austenitizing treatment: the steel is below 500°C, heated to 1100°C at a heating rate of 110°C / h, and the holding time is 3.6h;

[0030] (3) Oil quenching;

[0031] (4) Tempering treatment: directly put the above-mentioned oil-quenched blade steel into a furnace at 740°C for heat preservation, the heat preservation time is 6.0h, and then air-cooled to room temperature to obtain product B, with a grain size of 6.0 and no precipitation. Aggregation occurs.

Example Embodiment

[0032] Example 3:

[0033] A heat treatment method for improving high temperature durability of 10Cr11Co3W3NiMoVNbNB blade steel, comprising the following steps:

[0034] (1) Annealing treatment: The 10Cr11Co3W3NiMoVNbNB blade steel bar with Ф110mm after forging is directly put into the furnace at 730℃ for heat preservation, and the heat preservation time is 10h;

[0035] (2) Austenitizing treatment: the steel is below 500°C, heated to 1100°C at a heating rate of 110°C / h, and the holding time is 3.3h;

[0036] (3) Oil quenching;

[0037] (4) Tempering treatment: directly put the above-mentioned oil-quenched blade steel into a furnace at 730°C for heat preservation, the heat preservation time is 6.0h, and then air-cooled to room temperature, to obtain product C, with a grain size of 6.0 and no precipitation. Aggregation occurs.

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Abstract

The invention discloses a heat treatment method for a 10Cr11Co3W3NiMoVNbNB blade steel bar, relates to the technical field of heat treatment, and provides a heat treatment method which is relatively low in cost and can improve high-temperature durability of 10Cr11Co3W3NiMoVNbNB blade steel. The heat treatment method for the 10Cr11Co3W3NiMoVNbNB blade steel bar sequentially comprises the followingsteps: A, annealing treatment: after forging of the blade steel bar is completed, feeding the blade steel bar into a heat treatment furnace for heat preservation, and then performing air cooling untilthe temperature is lower than 500 DEG C, wherein the heat preservation temperature is 700-750 DEG C, the heat preservation time is 8-10 h * a/100, a is the diameter of the blade steel bar, and the unit of a is mm; B, austenitizing treatment: heating the blade steel bar to 1080-1120 DEG C at a heating rate of less than 120 DEG C/h, and then performing heat preservation, wherein the heat preservation time is 3h * a/100; C, oil quenching treatment of the blade steel bar; and D, tempering treatment: putting the blade steel bar into a heat treatment furnace at 700-750 DEG C for heat preservation,wherein the heat preservation time is 5-6 h * a/100, and then discharging the blade steel bar out of the furnace and performing air cooling to room temperature.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment method for 10Cr11Co3W3NiMoVNbNB blade steel rods. Background technique [0002] 10Cr11Co3W3NiMoVNbNB blade steel is mainly used in the manufacture of ultra-supercritical steam turbine high-temperature blades and bolt components. The main function of steam turbine blades is to convert the thermal energy of high-temperature steam into mechanical energy, and the working conditions are very complicated; when the rotor rotates at a high speed during operation, the centrifugal force of the blades will cause tensile stress; the bending stress and torsional stress of the blades are caused by the pressure of steam flow; The pin holes or root teeth transmitted to the blade root will also generate shear and compression stress; the frequent start and stop of the unit will also cause the blade to bear the alternating load and so on. Since blade steel is used under hig...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/18C21D1/26C21D6/00
CPCC21D1/18C21D1/26C21D6/004C21D6/007C21D9/0075
Inventor 王洪利何玉东吴铖川杜思敏
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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