Alloy ring forge piece for ultra-high pressure turbine and manufacturing method of alloy ring forge piece

A technology of ultra-high pressure steam turbines and manufacturing methods, applied in the direction of manufacturing tools, engine components, mechanical equipment, etc., can solve the problems of small forging temperature range, high requirements, high pressure hardness, etc., to improve intergranular corrosion resistance and stress resistance Corrosion resistance, effect of improving corrosion resistance

Inactive Publication Date: 2019-10-22
JIANGYIN HENGRUN RING FORGING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the high-pressure forgings for steam turbines are mainly composed of C: 0.18-0.24%, Si: 0.10-0.50%, Mn: 0.30-0.80%, P: ≤0.025%, S: ≤0.020%, Cr: 11.00- 12.5%, Mo: 0.80-1.20%, Ni: 0.30-0.80%, V: 0.25-0.35%, W≤0.60%, the existing ingredients cannot meet the mechanical properties of the product in three directions, and the existing steam turbine High-pressure resistant forgings, this type of steel material has high high-pressure hardness and poor forgeability
Forging temperature range is small 1150-950℃, forging is easy to crack
However, 2Cr11MoVNbN forgings are mainly used in steam turbines, which have high requirements, high alloy elements, and are easy to crack during forging and heat treatment, and it is difficult to meet the requirements for high pressure and durability.

Method used

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  • Alloy ring forge piece for ultra-high pressure turbine and manufacturing method of alloy ring forge piece

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Effect test

Embodiment 1

[0054] An alloy ring forging for an ultra-high pressure steam turbine, the alloy ring forging, by mass percentage, its chemical composition includes: carbon ≤ 0.015%, nitrogen 0.1%, manganese 0.6%, chromium 10%, nickel 0.3%, silicon 0.2% , copper 0.1%, aluminum 0.4%, tantalum 0.8%, niobium 1.1%, hafnium 1.5%, cobalt 0.1%, tungsten 1%, molybdenum 0.7%, titanium 0.01%, tin≤0.04%, tellurium 0.3%, lutetium 0.002%, Scandium is 0.001%, and the balance is iron and irremovable impurities. The forging is 2Cr11MoVNbN, and the size of the forging is Φ1317mm×Φ647mm×123mm.

[0055] A method for manufacturing an alloy ring forging for an ultra-high pressure steam turbine, the manufacturing method comprising the following process steps:

[0056] (1) For blanking, the steel ingot is an electroslag round ingot with a size of Φ600×680mm;

[0057] (2) Heating, control the furnace temperature to be less than 600°C, and preheat for 2 hours; heat to 830°C at a heating rate of ≤150°C / h, and maintai...

Embodiment 2

[0076] An alloy ring forging for an ultra-high pressure steam turbine, the alloy ring forging, by mass percentage, its chemical composition includes: carbon ≤ 0.015%, nitrogen 0.2%, manganese 0.75%, chromium 12.5%, nickel 0.45%, silicon 0.4% , copper 0.15%, aluminum 0.5%, tantalum 1.5%, niobium 1.25%, hafnium 2.35%, cobalt 0.2%, tungsten 2%, molybdenum 0.85%, titanium 0.01-0.04%, tin≤0.04%, tellurium 0.3-0.6%, Lutetium is 0.002-0.003%, scandium is 0.001-0.002%, and the balance is iron and irremovable impurities.

[0077] The preferred technical solution is that the forging is a 2Cr11MoVNbN forging, and the size of the forging is Φ1317mm×Φ647mm×123mm.

[0078] A method for manufacturing an alloy ring forging for an ultra-high pressure steam turbine, the manufacturing method comprising the following process steps:

[0079] (1) For blanking, the steel ingot is an electroslag round ingot with a size of Φ600×680mm;

[0080] (2) Heating, control the furnace temperature to be less ...

Embodiment 3

[0099] An alloy ring forging for an ultra-high pressure steam turbine, the alloy ring forging, by mass percentage, its chemical composition includes: carbon ≤ 0.015%, nitrogen 0.1%, manganese 0.6%, chromium 10%, nickel 0.3%, silicon 0.2% , copper 0.1%, aluminum 0.4%, tantalum 0.8%, niobium 1.1%, hafnium 1.5%, cobalt 0.1%, tungsten 1%, molybdenum 0.7%, titanium 0.01%, tin≤0.04%, tellurium 0.3%, lutetium 0.002%, Scandium is 0.001%, and the balance is iron and irremovable impurities. The forging is 2Cr11MoVNbN, and the size of the forging is Φ1317mm×Φ647mm×123mm.

[0100] A method for manufacturing an alloy ring forging for an ultra-high pressure steam turbine, the manufacturing method comprising the following process steps:

[0101] (1) For blanking, the steel ingot is an electroslag round ingot with a size of Φ600×680mm;

[0102] (2) Heating, control the furnace temperature to be less than 600°C, and preheat for 2 hours; heat to 850°C at a heating rate of ≤150°C / h, and maintain ...

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Abstract

The invention discloses an alloy ring forge piece for an ultra-high pressure turbine and a manufacturing method of the alloy ring forge piece. The alloy ring forge piece is manufactured from the chemical components of carbon, nitrogen, manganese, chromium, nickel, silicon, copper, aluminum, tantalum, niobium, hafnium, cobalt, tungsten, molybdenum, titanium, tin, tellurium, lutetium, scandium and iron; and the forge piece is a 2Cr11MoVNbN forge piece. The manufacturing method comprises the following stepsofblanking, heating, forging, machining, tempering heat treatment and stress relief annealing, specifically, the tempering step includes the steps ofa, carrying out scanning irradiation on the surface of a rolled ring piece by using a laser beam emitted by a laser heat treatment machine; b,heating the ring piece obtained after laserscanningand irradiationto 620-640 DEG C at a temperature rising speed beingless than or equal to 150 DEG C per hour, keeping the temperature for primary tempering for 16 hours, and then preforming air cooling; and c, again, heating the ring piece to 620-640 DEG C at the temperature rising speed beingless than or equal to 150 DEG C per hour, keeping the temperature for secondary tempering for 16 hours, and performing air cooling. According to the ring forge piece and the manufacturing method, the ring forge piece has good high-pressure resistance, themechanical property of the ring piece can be remarkably improved, the machining and manufacturing cost is low, and the machining process is simple.

Description

technical field [0001] The invention relates to the technical field of manufacturing special ring parts for steam turbines, in particular to an alloy ring forging for ultra-high pressure steam turbines and a manufacturing method thereof. Background technique [0002] In the prior art, the high-pressure forgings for steam turbines are mainly composed of C: 0.18-0.24%, Si: 0.10-0.50%, Mn: 0.30-0.80%, P: ≤0.025%, S: ≤0.020%, Cr: 11.00- 12.5%, Mo: 0.80-1.20%, Ni: 0.30-0.80%, V: 0.25-0.35%, W≤0.60%, the existing ingredients cannot meet the mechanical properties of the product in three directions, and the existing steam turbine High-pressure forgings, this type of steel material has high high-pressure hardness and poor forgeability. The forging temperature range is as small as 1150-950°C, and the forging is easy to crack. However, 2Cr11MoVNbN forgings are mainly used in steam turbines, which have high requirements and high alloy elements, and are easy to crack during forging and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/25C21D1/26C21D1/30C21D6/00C21D8/00C21D9/40C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/60B21K1/76
CPCB21K1/761C21D1/25C21D1/26C21D1/30C21D6/004C21D6/005C21D6/007C21D6/008C21D8/005C21D9/40C21D2211/001C21D2211/004C22C38/001C22C38/002C22C38/005C22C38/008C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52C22C38/60
Inventor 承立新周洪亮张伟孙峰周敏蒋费龙
Owner JIANGYIN HENGRUN RING FORGING
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