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
CN106903246AInactive Publication Date: 2017-06-30HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
Publication Date
2017-06-30
Estimated Expiration
Not applicable Β· inactive patent

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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.
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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 Ξ΄-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 Ξ΄-ferrite content in the steel structure for 2Cr11Mo1VNbN steam turbine blades produced ...

Claims

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