CN107988476A - High-temperature bearing SA-335P91 tubing residual temperature heat treatment methods - Google Patents

High-temperature bearing SA-335P91 tubing residual temperature heat treatment methods Download PDF

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Publication number
CN107988476A
CN107988476A CN201711330257.3A CN201711330257A CN107988476A CN 107988476 A CN107988476 A CN 107988476A CN 201711330257 A CN201711330257 A CN 201711330257A CN 107988476 A CN107988476 A CN 107988476A
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Prior art keywords
temperature
annealing
pipe
heat treatment
tubing
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CN201711330257.3A
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Chinese (zh)
Inventor
冯伟
郭元
庞海平
李永清
杜红强
万飞
陈献刚
朱志华
梁琦
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Inner Mongolia North Heavy Industries Group Co Ltd
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Inner Mongolia North Heavy Industries Group Co Ltd
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Priority to CN201711330257.3A priority Critical patent/CN107988476A/en
Publication of CN107988476A publication Critical patent/CN107988476A/en
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    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • 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
    • C21D1/28—Normalising
    • 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
    • C21D1/78—Combined heat-treatments not provided for above
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C22C38/02—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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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

Abstract

The invention discloses a kind of high-temperature bearing SA 335P91 tubing residual temperature heat treatment methods, furnace cooling after pipe extruding, pipe charging temperature >=650 DEG C；Pipe isothermal annealing, annealing isothermal temperature choose 730~780 DEG C；Pipe is heated up at 750 ± 10 DEG C of isothermal temperature of annealing and carries out normalizing, normalizing temperature chooses 1050 ± 10 DEG C；Pipe is cooled to room temperature by normalizing after coming out of the stove, and obtains SA 335P91 tubing.The problem of present invention rationally using thermal deformation residual temperature, annealing residual temperature, solves annealing and heat treatment time length, and energy consumption is big, efficiency is low.

Description

High-temperature bearing SA-335P91 tubing residual temperature heat treatment methods
Technical field
The present invention relates to a kind of heat treatment technics, specifically, is related at a kind of high-temperature bearing SA-335P91 tubing residual temperature heat Reason method.
Background technology
With the development of power industry, the birth in overcritical power station, SA-335P91 tubing is widely used in such power station Among main steam line.The material pipe is as high alloy power station seamless steel pipe, and the requirement of its performance is stringent, in modern electricity Factory, this material pipe allow higher operating parameter, and suitable for vapor (steam) temperature at 580 DEG C~620 DEG C, pressure makes more than 250bar's With environment, there is the advantage for improving the thermal efficiency, extensive use is achieved in all kinds of power station products.The steel grade introduced in recent years to China, starts to domesticize.From in July, 2009, extruding once succeeds, and 3.6 ten thousand tons of vertical extruders of domestic first set are built up in our factory, Indicate that the high-end seamless steel pipe manufacturing technology in China obtains important breakthrough, particularly with supercritical thermal power unit SA-335P91 For material seamless steel pipe, the external technical monopoly in high-temperature and pressure pipeline field is broken.With the high-end nothing of SA-335P91 classes After stitching steel tube fabrication technique acquisition important breakthrough, Related product pricing system has also carried out Important Adjustment in world wide, such The price of product is adjusted downward to less than 30,000 yuan by 120,000 yuan of price per ton, market competition and its fierceness.Therefore, high-end seamless steel pipe Technological difficulties be changed into " how low cost manufacture quality product " by " how manufacturing qualified products ".
SA-335P91 is the grade of steel in ASME SA-335 standards, is developed by american rubber ridge government test room , material for nuclear power (can also be used for other side) high temperature pressurized component, which is transplanted to by China in nineteen ninety-five In GB5310 standards, the trade mark is set to 10Cr9Mo1VNb.Shown in its chemical component table 1.
1 SA-335P91 chemical compositions of table
Note：S≤0.010, P≤0.020.
As shown in Figure 1, it is the heat treatment method schematic diagram of SA-335P91 tubing in the prior art.
Heat treatment method：Extruding → annealing →≤200 DEG C of → cold charge stoves of coming out of the stove and (hang lower trolley and be cooled to room temperature) → final heat Processing → section physics and chemistry.
Traditional low temperature isothermal annealing is taken in annealing, and cooling in stove is taken after isothermal, less than≤150 is furnace-cooled to and is air-cooled to room Temperature.Final heat treatment takes cold charge stove, and the temperature that workpiece is warming up to final heat treatment again carries out normalizing.Often it is heat-treated once Or so average used time 85h.
As can be seen that in the prior art the annealing of high-temperature bearing SA-335P91 tubing and the heat treatment process time length, energy consumption Greatly, former annealing and during small total heat treatment time 85 more than.
The content of the invention
Technical problem solved by the invention is to provide a kind of high-temperature bearing SA-335P91 tubing residual temperature heat treatment method, Rationally using thermal deformation residual temperature, annealing residual temperature, solve annealing and heat treatment time length, the problem of energy consumption is big, efficiency is low.
Technical solution is as follows：
A kind of high-temperature bearing SA-335P91 tubing residual temperature heat treatment method, furnace cooling after pipe extruding, pipe charging temperature >= 650℃；Pipe isothermal annealing, annealing isothermal temperature choose 730~780 DEG C；By pipe at 750 ± 10 DEG C of isothermal temperature of annealing Heating carries out normalizing, and normalizing temperature chooses 1050 ± 10 DEG C；Pipe is cooled to room temperature by normalizing after coming out of the stove, and obtains SA-335P91 Tubing.
Further：Isothermal temperature of annealing chooses 750 ± 10 DEG C.
Further：The type of cooling is taken air-cooled or air-cooled.
Compared with prior art, the technology of the present invention effect includes：
1st, annealing of the present invention to SA-335P91 tubing, heat treatment process are optimized, and solve annealing and heat treatment The problem of time is grown, and energy consumption is big, efficiency is low, achievees the purpose that energy-saving, cost efficiency.
The present invention breaches the thermal deformation of SA-335P91 pipe-type products, annealing, the separated fixed thinking of heat treatment, rationally Using thermal deformation residual temperature, annealing residual temperature, the heat treatment time of such product is not only reduced, has saved the energy, and improve Technical indicator, extends service life.
After being heat-treated using residual temperature, yield strength is maintained at more than 490MPa, and tensile strength is maintained at more than 650MPa, room Temperature impact reaches more than 190J, and grain size reaches 7 grades or so (GB5310 technical indicators：Yield strength >=415MPa, tensile strength >=585MPa, elongation percentage >=16%, room temperature impact work(>=27J, metallographic structure are tempered martensite, grain size >=4, differential≤3 Level)；Residual temperature heat treatment method is often heat-treated once, and original heat treatment time 85h is foreshortened to 47h, improves production efficiency 45%. Energy consumption is by original 8000M3It is reduced to 55812M3, reduce energy consumption 30%.
2nd, remarkable in economical benefits.This method can improve technical target of the product, extend product service life on the basis of, Manufacture cost is reduced, there is good application value, remarkable in economical benefits.
By trial production, statistics draws new heat treatment method, is often heat-treated and once averagely saves 38h, natural gas saving 2418.8,4183.3 yuan of expense (natural gas is per 1.99 yuan/of stove) is saved, produces 2500 such material pipes per year, saving takes With 1,200,000 yuan.
Risk assessment：By demonstration in detail before being tested due to this method, there is the theories integration of abundance, and promoted and applied In actual production, in practice it has proved that devoid of risk.
Brief description of the drawings
Fig. 1 is the heat treatment method schematic diagram of SA-335P91 tubing in the prior art；
Fig. 2 is the heat treatment method schematic diagram of SA-335P91 tubing in the present invention.
Embodiment
Elaborate below with reference to example embodiment to technical solution of the present invention.However, example embodiment can Implement in a variety of forms, and be not understood as limited to embodiment set forth herein；On the contrary, these embodiments are provided so that The design of example embodiment more comprehensively and completely, and is comprehensively communicated to those skilled in the art by the present invention.
For SA-335P91 alloy thin-walls (BH≤75mm) seamless tube blank, rationally using extruding, annealing residual temperature, will anneal And final heat treatment process merges.
High-temperature bearing SA-335P91 tubing residual temperature heat treatment methods, specifically include following steps：
As shown in Fig. 2, it is the heat treatment method schematic diagram of SA-335P91 tubing in the present invention.
Step 1：Furnace cooling after pipe extruding, pipe charging temperature >=650 DEG C；
Rationally utilize thermal deformation residual temperature：
SA-335P91 material alloys contents are higher, can produce martensitic structure being cooled to 430 DEG C or so, pipe is squeezing Actual temperature is often higher after pressure, generally more than 1000 DEG C, when pipe is directly cooled to less than 430 DEG C, will generate lath Shape martensitic structure (non-equilibrium microstructure), for the higher steel grade of alloy content, non-equilibrium microstructure has stronger legacy, thick Lath martensite tissue can be retained in follow-up heat treatment process.Therefore, the mode of furnace cooling is taken after extruding, is protected Demonstrate,prove pipe extruding fed to boiler temperature and be not less than 650 DEG C, avoid pipe from producing non-equilibrium microstructure.
Step 2：Isothermal annealing, annealing isothermal temperature choose 750 ± 10 DEG C；
The mode for being furnace-cooled to room temperature in the prior art is no longer taken after annealing isothermal.
The present invention changes annealing way, rationally utilizes residual temperature of annealing：
Stablized according to indices after pipe annealing early period, the probability for annealing white point occur is zero, especially the crystal grain of pipe Degree can reach 7 grades or so after final heat treatment, be drawn with reference to sample isothermal test and in recent years production practices, the material Optimum Isothermal temperature is at 730~780 DEG C, therefore, chooses the silicon carbide and carries out isothermal annealing, iron is obtained after can ensureing annealing The statenchyma of ferritic+carbide, and fully expand hydrogen, can cancel the furnace cooling process after isothermal on this basis, directly into Row heating heat treatment.
Step 3：Pipe is heated up at 750 ± 10 DEG C of isothermal temperature of annealing and carries out normalizing, normalizing temperature selection 1050 ± 10℃；
Using annealing, residual temperature carries out final heat treatment.
Step 4：Pipe is air-cooled to room temperature by normalizing after coming out of the stove, and obtains SA-335P91 tubing.
It can use air-cooled.
With the forward and backward carry out examples comparative of process modification：
Before taking new method, Physico-chemical tests performance substantially conforms to require, exemplified by the selection representational pipe of 20 braces：
Table 2 takes physical and chemical experiment statistical form before new method
As can be seen from the above results, the heat treatment method before improvement, yield strength average value reach 517MPa, and tension is strong Degree average value reaches 687MPa, and elongation percentage average value reaches 28%, and impact average value reaches 195J.Grain size averagely reaches 6.5 Level, wherein less than 7 grades accountings 42%, mixed crystal accounting 10%.
After taking residual temperature to be heat-treated, experimental performance can not only be met the requirements, and obtain certain raising, choose 20 Exemplified by representative pipe：
Physical and chemical experiment statistical form after the heat treatment of 3 residual temperature of table
As can be seen from the above results, in the present invention, yield strength average value remains at 517MPa, and tensile strength is average Value reaches 688MPa, and elongation percentage average value reaches 26%, and impact average value reaches 225J.Grain size averagely reaches 7.5 grades, wherein Less than 7 grades accountings 35%, mixed crystal accounting 5%.Residual temperature is heat-treated the intensity index that can not only ensure the material pipe, Er Qiejin Tissue after the heat treatment of step refining pipe, impact property index improve 15.5%.
The product of experiment is counted, residual temperature heat treatment method is often heat-treated once, and original heat treatment time 85h is contracted 47h is as short as, improves production efficiency 45%.Energy consumption is by original 8000M3It is reduced to 5581.2M3, reduce energy consumption more than 30%.
Term used herein is explanation and exemplary and nonrestrictive term.Since the present invention can be with a variety of Form specific implementation without departing from the spiritual or substantive of invention, it should therefore be appreciated that above-described embodiment be not limited to it is any foregoing Details, and should widely being explained in the spirit and scope that appended claims are limited, thus fall into claim or its etc. Whole changes and remodeling in the range of effect all should be appended claims and covered.

Claims (3)

  1. A kind of 1. high-temperature bearing SA-335P91 tubing residual temperature heat treatment method, it is characterised in that：Furnace cooling after pipe extruding, pipe Charging temperature >=650 DEG C；Pipe isothermal annealing, annealing isothermal temperature choose 730~780 DEG C；By pipe in annealing isothermal temperature Heating carries out normalizing at 750 ± 10 DEG C, and normalizing temperature chooses 1050 ± 10 DEG C；Pipe is cooled to room temperature by normalizing after coming out of the stove, and is obtained To SA-335P91 tubing.
  2. 2. high-temperature bearing SA-335P91 tubing residual temperature heat treatment method as claimed in claim 1, it is characterised in that：Annealing isothermal Temperature chooses 750 ± 10 DEG C.
  3. 3. high-temperature bearing SA-335P91 tubing residual temperature heat treatment method as claimed in claim 1, it is characterised in that：The type of cooling Take air-cooled or air-cooled.
CN201711330257.3A 2017-12-13 2017-12-13 High-temperature bearing SA-335P91 tubing residual temperature heat treatment methods Pending CN107988476A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102581555A (en) * 2012-02-21 2012-07-18 衡阳华菱钢管有限公司 P91 seamless steel pipe and method for manufacturing same
US8246767B1 (en) * 2005-09-15 2012-08-21 The United States Of America, As Represented By The United States Department Of Energy Heat treated 9 Cr-1 Mo steel material for high temperature application
CN105385822A (en) * 2015-11-04 2016-03-09 武汉重工铸锻有限责任公司 Thermal treatment method for breaking large P91/P92 material forged piece structure inheritance and refining grains

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8246767B1 (en) * 2005-09-15 2012-08-21 The United States Of America, As Represented By The United States Department Of Energy Heat treated 9 Cr-1 Mo steel material for high temperature application
CN102581555A (en) * 2012-02-21 2012-07-18 衡阳华菱钢管有限公司 P91 seamless steel pipe and method for manufacturing same
CN105385822A (en) * 2015-11-04 2016-03-09 武汉重工铸锻有限责任公司 Thermal treatment method for breaking large P91/P92 material forged piece structure inheritance and refining grains

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
冯伟 等: "超临界挤压无缝管坯热处理工艺", 《金属加工（热加工）》 *
许江晓: "《电站金属实用焊接技术》", 30 July 2011, 中国电力出版社 *

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