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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

AI Technical Summary

Problems solved by technology

However, this method involves the addition of rare earth elements, the cost is high, and the control of process parameters is difficult

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0022] (1) Annealing treatment: put the 10Cr11Co3W3NiMoVNbNB blade steel bar with a diameter of Ф150 mm after forging directly into a furnace at 750 ° C for 13 hours;

[0023] (2) Austenitizing treatment: the above-mentioned annealed steel is heated below 500°C at a heating rate of 110°C / h to 1090°C for 4.5 hours;

[0024] (3) oil quenching;

[0025] (4) Tempering treatment: Put the above oil-quenched blade steel directly into a furnace at 750°C to keep it warm for 7.5 hours, and then take it out of the furnace and air cool it to room temperature to obtain product A. figure 1 , the grain size is 5.5, and the morphology of the precipitated phase is as follows figure 2 As shown, the precipitated phases did not aggregate.

Embodiment 2

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

[0028] (1) Annealing treatment: put the 10Cr11Co3W3NiMoVNbNB blade steel bar of Ф120mm after forging directly into the furnace at 740°C for 10 hours;

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

[0030] (3) oil quenching;

[0031] (4) Tempering treatment: put the above oil-quenched blade steel directly into a furnace at 740°C for 6.0 hours, and then take it out of the furnace and air cool it to room temperature to obtain product B, with a grain size of 6.0 and no precipitates. Aggregation occurs.

Embodiment 3

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

[0034] (1) Annealing treatment: put the 10Cr11Co3W3NiMoVNbNB blade steel bar of Ф110mm after forging directly into the furnace at 730 ° C for 10 hours;

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

[0036] (3) oil quenching;

[0037] (4) Tempering treatment: put the above oil-quenched blade steel directly into a furnace at 730°C for 6.0 hours to keep it warm, and then take it out of the furnace and air cool it to room temperature to obtain product C with a grain size of 6.0 and no precipitates. 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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