Forging process for steel forging piece for 2Cr11Mo1VNbN steam turbine blade

A 2cr11mo1vnbn, steam turbine blade technology, applied in the field of steel material manufacturing process control, to achieve the effects of small machining allowance, high strength and toughness, and extended service life

Inactive Publication Date: 2017-06-30
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the 2Cr11Mo1VNbN steam turbine blade steel produced in the above-mentioned prior art that the δ-ferrite content is high, forging is very easy to crack and seriously affects its strength and toughness, and to provide a solution to the 2Cr11Mo1VNbN steam turbine blade steel. The forging process of 2Cr11Mo1VNbN steel forgings for steam turbine blades, which meets the requirements of strength and toughness, reduces machining allowance and improves production efficiency.

Method used

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  • Forging process for steel forging piece for 2Cr11Mo1VNbN steam turbine blade
  • Forging process for steel forging piece for 2Cr11Mo1VNbN steam turbine blade

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Embodiment 1

[0016] The forging process of 2Cr11Mo1VNbN steam turbine blade steel forgings is analyzed by taking 2Cr11Mo1VNbN steam turbine blade steel forgings with a diameter of 125mm (forging blank size is φ140mm) as an example. The specifications for heating before forging steel blades of this specification are as follows figure 1 , Control the furnace temperature not to exceed 600℃ and keep it at this temperature for 3 hours, then heat it up to 650~750℃ at a heating rate not exceeding 70℃ / h, keep it for 6 hours, and then keep it at a temperature not exceeding 100℃ / h The heating rate is increased to 1190±10℃ and kept for 4 hours, then the temperature is lowered to 1100±10℃, and the temperature is kept for 2 hours. The forging is carried out; the forging process controls the deformation amount, deformation speed and deformation temperature to ensure uniform deformation and avoid structure and temperature stress.

[0017] The process route is: electric furnace smelting + vacuum refining → el...

Embodiment 2

[0023] The forging process of 2Cr11Mo1VNbN steam turbine blade steel forgings is analyzed by taking the 2Cr11Mo1VNbN steam turbine blade steel forgings with a diameter of 185mm (forging blank size is φ200mm) as an example. Control the heating before forging of the blade steel of this specification: the furnace temperature does not exceed 600℃ and the temperature is kept at this temperature for 5 hours, and then the temperature is raised to 650~750℃ at a heating rate not exceeding 70℃ / h, and the temperature is kept for 8 hours. Then increase the temperature to 1190±10℃ at a heating rate of no more than 100℃ / h and keep it warm for 6 hours, then cool it down to 1100±10℃, keep it for 4 hours, and then roll out forging; the forging process controls the deformation amount, deformation speed and deformation temperature to ensure uniform deformation , Avoid organization and temperature stress.

[0024] The specific production process is: electric furnace smelting + vacuum refining → elec...

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Abstract

The invention relates to a forging process for a steel forging piece for a 2Cr11Mo1VNbN steam turbine blade. The forging process comprises the following steps of: during heating before forging, controlling a charging temperature to not exceed 600 DEG C, controlling a low-temperature temperature rise rate to not exceed 70 DEG C/h, preserving heat for 6-8 hours at a temperature of 650-750 DEG C, and heating to 1190 +/-10 DEG C at temperature rising speed not exceeding 100 DEG C/h, cooling to 1100 +/- 10 DEG C after preserving the heat for 4-6 hours at a temperature of 1190 +/-10 DEG C, and tapping and forging after preserving the heat for 2-4 hours; during forging, adopting a A-B-clamping-jaw transverse pulling forging mode or a pushing forging mode through a precision forging machine, clamping the tail end of an ingot after loading, and enabling a dead head end to face towards a chuck B. In order to overcome the defects that a steel structure, produced in the prior art, for the 2Cr11Mo1VNbN steam turbine blade is high in sigma-ferrite content, is extremely liable to crack during forging, and is severely affected in strength and toughness, the invention provides the forging process for the steel forging piece for the 2Cr11Mo1VNbN steam turbine blade, and the forging process solves the cracking problem of the steel forging piece for the 2Cr11Mo1VNbN steam turbine blade, meets the strength and toughness requirements, reduces machining allowance and improves production efficiency.

Description

Technical field [0001] The invention relates to the field of steel material manufacturing process control, in particular to a forging process of a 2Cr11Mo1VNbN steam turbine blade steel forging. Background technique [0002] At present, the conventional production method of 2Cr11Mo1VNbN steam turbine blade steel is: heating according to the general technical requirements for heating of free forgings, group III steel, using oil (water) press for forming, not only large forging margin, forging deformation, deformation speed and deformation The temperature is difficult to precisely control, and the δ-ferrite content in the structure is high, and the forging is extremely easy to crack, which seriously affects its strength and toughness, and the production cost and rejection rate are high. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of high δ-ferrite content in the steel structure for 2Cr11Mo1VNbN steam turbine blades produced ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J1/06B21J5/00B21J9/20B21K3/04
CPCB21J1/06B21J5/00B21J9/20B21K3/04
Inventor 叶玉娟高全德孟祥顺赵东
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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