CN106282836B - Steam turbine 2Cr11MoVNbN forging and its manufacturing method - Google Patents

Steam turbine 2Cr11MoVNbN forging and its manufacturing method Download PDF

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CN106282836B
CN106282836B CN201610785114.0A CN201610785114A CN106282836B CN 106282836 B CN106282836 B CN 106282836B CN 201610785114 A CN201610785114 A CN 201610785114A CN 106282836 B CN106282836 B CN 106282836B
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temperature
heated
heating rates
forging
blank
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CN106282836A (en
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万明珍
吴剑
朱乾皓
彭文虎
钱兵
陈磊
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Zhangjiagang Zhonghuan Sea and Land High-end Equipment Co., Ltd.
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Zhangjiagang Hailu Annular Forging Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Child & Adolescent Psychology (AREA)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)

Abstract

This application discloses a kind of steam turbine 2Cr11MoVNbN forging and its manufacturing method, this method includes：(1), blanking；(2), computer heating control charging temperature is less than 600 DEG C, and preheats 2 hours；830~850 DEG C are heated to≤150 DEG C/h heating rates, keeps temperature 3 hours；1160~1200 DEG C are heated to≤150 DEG C/h heating rates, keeps temperature 5 hours；Cooling；(3), it forges；(4), forging rear annealing；(5), conditioning treatment：Partial annealing；(6) Tempering and Quenching：A, 1050~1070 DEG C are heated to be less than≤180 DEG C/h heating rates, keep temperature quenching 8.5h, medium water cooling；B, 620~640 DEG C are heated to be less than≤150 DEG C/h heating rates, temperature is kept to carry out primary tempering 16h, it is air-cooled；C, 620~640 DEG C are heated to be less than≤150 DEG C/h heating rates, temperature is kept to carry out double tempering 16h, it is air-cooled.(7) stress relief annealing.Blank is not easy to crack in the method for the present invention forging and heat treatment process, and high-temperature and durable is long, and product mechanical property is met the requirements.

Description

Steam turbine 2Cr11MoVNbN forging and its manufacturing method
Technical field
The application belongs to annular forging piece technical field of forging, more particularly to a kind of steam turbine 2Cr11MoVNbN forging And its manufacturing method.
Background technology
2Cr11MoVNbN forging is mainly used in steam turbine, it is required that high, alloying element is high, easily at forging and heat It cracks during reason, high-temperature and durable difficulty reaches requirement.
Invention content
The purpose of the present invention is to provide a kind of steam turbine 2Cr11MoVNbN forging and its manufacturing method, existing to overcome There is the deficiency in technology.
To achieve the above object, the present invention provides following technical solution：
The embodiment of the present application discloses a kind of steam turbine 2Cr11MoVNbN forging, and chemical composition is according to mass ratio packet It includes：C：0.15~0.2；Si：0.2~0.6；Mn：0.6~0.9；P≤0.025；S≤0.025；Cr：10~11.5；Mo：0.7~ 1；Ni：0.3~0.6；Cu≤0.25；W≤0.25；V：0.15~0.25；Nb：0.05~0.15；N：0.05~0.09；Al：≤ 0.04；Co≤0.25；Ti≤0.04；Sn≤0.04, surplus Fe.
Correspondingly, disclosed herein as well is a kind of smeltings for the steam turbine steel ingot of 2Cr11MoVNbN forging Method, using electric furnace+vacuum metling+vacuum outgas.
The embodiment of the present application also discloses a kind of manufacturing method of steam turbine 2Cr11MoVNbN forging, the forging's block dimension For Φ 1317mm × Φ 647mm × 123mm, manufacturing method includes：
(1), blanking
Steel ingot is electroslag billet, and size is 600 × 680mm of Φ；
(2), it heats
Charging temperature is controlled to be less than 600 DEG C, and is preheated 2 hours；830~850 are heated to≤150 DEG C/h heating rates DEG C, keep temperature 3 hours；1160~1200 DEG C are heated to≤150 DEG C/h heating rates, keeps temperature 5 hours；Cooling；
(3), it forges
Control temperature is below 1120 DEG C after blank is come out of the stove；
Upsetting pull base is pulled out using three upsettings two, to forge interior tissue, including：
S1, blank jumping-up to 400mm；
It is pulled out after s2, blank chamfered edge are round as a ball to 600mm；
S3, blank are upset to 400mm；
It is pulled out after s4, blank chamfered edge are round as a ball to 600mm；
S5, blank are upset to 250mm；
It is flattened after s6, round as a ball shaping punching to ejection height 175mm；
Ring rolls is transferred to after the completion of base grind and type is made, then carry out forging rear annealing：To be less than≤150 DEG C/h liters Warm speed is heated to 420~460 DEG C, keeps temperature 2h, is heated to 750~800 DEG C to be less than≤150 DEG C/h heating rates, protects Temperature 8h is held, furnace cooling is air-cooled to 550 DEG C；Conditioning treatment：Partial annealing is heated to being less than≤150 DEG C/h heating rates 850~900 DEG C, temperature 8h is kept, furnace cooling is air-cooled to 550 DEG C；
(4), Tempering and Quenching
A, 1050~1070 DEG C are heated to be less than≤180 DEG C/h heating rates, keep temperature quenching 8.5h, medium water It is cold；
B, 620~640 DEG C are heated to be less than≤150 DEG C/h heating rates, temperature is kept to carry out primary tempering 16h, it is empty It is cold；
C, 620~640 DEG C are heated to be less than≤150 DEG C/h heating rates, temperature is kept to carry out double tempering 16h, it is empty It is cold；
(5), stress relief annealing：580~620 DEG C are heated to be less than≤150 DEG C/h heating rates, keeps temperature 8h, stove Be as cold as 450 DEG C it is air-cooled.
Preferably, in above-mentioned steam turbine in the manufacturing method of 2Cr11MoVNbN forging, in the step (3), upsetting pull During base, once blank temperature is less than 1050 DEG C, heat preservation need to be melted down 1~2 hour.
Compared with prior art, the advantage of the invention is that：
Blank is not easy to crack in the method for the present invention forging and heat treatment process, and high-temperature and durable is long, and product mechanical property is full Foot requirement.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or it will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments described in application, for those of ordinary skill in the art, without creative efforts, It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 show the curve graph that forging heats in the specific embodiment of the invention；
Fig. 2 show the curve graph of forging Tempering and Quenching in the specific embodiment of the invention；
Fig. 3 show the metallograph of forging in the specific embodiment of the invention.
Specific embodiment
The present invention is described further by the following example：According to following embodiments, the present invention may be better understood. However, as it will be easily appreciated by one skilled in the art that the described specific material ratio of embodiment, process conditions and its result are only used In illustrating the present invention, without the present invention described in detail in claims should will not be limited.
(1) ingot smelting
Using electric furnace+vacuum metling+vacuum outgas,
Steel ingot chemical composition includes according to mass ratio：C：0.15~0.2；Si：0.2~0.6；Mn：0.6~0.9；P≤ 0.025；S≤0.025；Cr：10~11.5；Mo：0.7~1；Ni：0.3~0.6；Cu≤0.25；W≤0.25；V：0.15~ 0.25；Nb：0.05~0.15；N：0.05~0.09；Al：≤0.04；Co≤0.25；Ti≤0.04；Sn≤0.04, surplus are Fe。
(2), blanking
Steel ingot is electroslag billet, and size is 600 × 680mm of Φ；
(3), it heats
With reference to shown in Fig. 1, control charging temperature is less than 600 DEG C, and preheats 2 hours；It is heated with≤150 DEG C/h heating rates To 830~850 DEG C, temperature is kept 3 hours；1160~1200 DEG C are heated to≤150 DEG C/h heating rates, keeps temperature 5 small When；Cooling；
(4), it forges
Control temperature is below 1120 DEG C after blank is come out of the stove；
Upsetting pull base is pulled out using three upsettings two, to forge interior tissue, including：
S1, blank jumping-up to 400mm；
It is pulled out after s2, blank chamfered edge are round as a ball to 600mm；
S3, blank are upset to 400mm；
It is pulled out after s4, blank chamfered edge are round as a ball to 600mm；
S5, blank are upset to 250mm；
It is flattened after s6, round as a ball shaping punching to ejection height 175mm；
Ring rolls is transferred to after the completion of base grind and type is made, then carry out forging rear annealing：To be less than≤150 DEG C/h liters Warm speed is heated to 420~460 DEG C, keeps temperature 2h, is heated to 750~800 DEG C to be less than≤150 DEG C/h heating rates, protects Temperature 8h is held, furnace cooling is air-cooled to 550 DEG C；Conditioning treatment：Partial annealing is heated to being less than≤150 DEG C/h heating rates 850~900 DEG C, temperature 8h is kept, furnace cooling is air-cooled to 550 DEG C；
During upsetting pull base, once blank temperature is less than 1050 DEG C, heat preservation need to be melted down 1~2 hour.
(5), Tempering and Quenching, with reference to shown in Fig. 2：
A, 1050~1070 DEG C are heated to be less than≤180 DEG C/h heating rates, keep temperature quenching 8.5h, medium water It is cold；
B, 620~640 DEG C are heated to be less than≤150 DEG C/h heating rates, temperature is kept to carry out primary tempering 16h, it is empty It is cold；
C, 620~640 DEG C are heated to be less than≤150 DEG C/h heating rates, temperature is kept to carry out double tempering 16h, it is empty It is cold.
(6), stress relief annealing：580~620 DEG C are heated to be less than≤150 DEG C/h heating rates, keeps temperature 8h, stove Be as cold as 450 DEG C it is air-cooled.
Mechanics properties testing, parameter such as table 1 are carried out to forging.
Table 1
Fig. 3 show the metallograph of obtained forging.
Here, it should also be noted that, in order to avoid because having obscured the present invention during unnecessary details, in the accompanying drawings only It shows the structure and/or processing step closely related with scheme according to the present invention, and is omitted little with relationship of the present invention Other details.
Finally, it is to be noted that, term " comprising ", "comprising" or its any other variant be intended to it is non-exclusive Property include so that process, method, article or equipment including a series of elements not only include those elements, but also Further include other elements that are not explicitly listed or further include for this process, method, article or equipment it is intrinsic Element.

Claims (2)

1. a kind of steam turbine manufacturing method of 2Cr11MoVNbN forging, it is characterised in that：2Cr11MoVNbN forging, chemistry Ingredient includes according to mass percent：C：0.15~0.2；Si：0.2~0.6；Mn：0.6~0.9；P≤0.025；S≤0.025； Cr：10~11.5；Mo：0.7~1；Ni：0.3~0.6；Cu≤0.25；W≤0.25；V：0.15~0.25；Nb：0.05~ 0.15；N：0.05~0.09；Al：≤0.04；Co≤0.25；Ti≤0.04；Sn≤0.04, surplus Fe,
The forging's block dimension is Φ 1317mm × Φ 647mm × 123mm, and manufacturing method includes：
(1), blanking
Steel ingot is electroslag billet, and size is 600 × 680mm of Φ；
(2), it heats
Charging temperature is controlled to be less than 600 DEG C, and is preheated 2 hours；830~850 DEG C are heated to≤150 DEG C/h heating rates, is protected Hold temperature 3 hours；1160~1200 DEG C are heated to≤150 DEG C/h heating rates, keeps temperature 5 hours；Cooling；
(3), it forges
Control temperature is below 1120 DEG C after blank is come out of the stove；
Upsetting pull base is pulled out using three upsettings two, to forge interior tissue, including：
S1, blank jumping-up to 400mm；
It is pulled out after s2, blank chamfered edge are round as a ball to 600mm；
S3, blank are upset to 400mm；
It is pulled out after s4, blank chamfered edge are round as a ball to 600mm；
S5, blank are upset to 250mm；
It is flattened after s6, round as a ball shaping punching to ejection height 175mm；
Ring rolls is transferred to after the completion of base grind and type is made, then carry out forging rear annealing：Added with≤150 DEG C/h heating rates Heat keeps temperature 2h to 420~460 DEG C, is heated to 750~800 DEG C with≤150 DEG C/h heating rates, keeps temperature 8h, furnace cooling It is air-cooled to 550 DEG C；Conditioning treatment：Partial annealing is heated to 850~900 DEG C with≤150 DEG C/h heating rates, keeps temperature 8h is spent, furnace cooling is air-cooled to 550 DEG C；
(4), Tempering and Quenching
A, 1050~1070 DEG C are heated to≤180 DEG C/h heating rates, keep temperature quenching 8.5h, medium water cooling；
B, 620~640 DEG C are heated to≤150 DEG C/h heating rates, temperature is kept to carry out primary tempering 16h, it is air-cooled；
C, 620~640 DEG C are heated to≤150 DEG C/h heating rates, temperature is kept to carry out double tempering 16h, it is air-cooled；
(5), stress relief annealing：580~620 DEG C are heated to≤150 DEG C/h heating rates, keeps temperature 8h, furnace cooling is to 450 DEG C It is air-cooled.
2. the steam turbine according to claim 1 manufacturing method of 2Cr11MoVNbN forging, it is characterised in that：The step Suddenly in (3), during upsetting pull base, once blank temperature is less than 1050 DEG C, heat preservation need to be melted down 1~2 hour.
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CN111558680B (en) * 2020-06-22 2021-12-21 无锡派克新材料科技股份有限公司 Manufacturing method of large-section F53 solid forging
CN114317897B (en) * 2021-12-15 2024-05-24 中国航发北京航空材料研究院 Preliminary heat treatment process for super-strong high-toughness carburizing steel bar and forging
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Title
汽轮机隔板锻件2Cr11Mo1VNbN钢热处理工艺;刘双明等;《东方电气评论》;20120625;第26卷(第102期);第18-21页 *
高温汽轮机环锻件用2Cr11MoVNbN钢的热处理工艺优化;张毅峰等;《机械工程材料》;20110430;第35卷(第4期);第10-12页 *

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