CN112195333A - Method for improving on-site postweld heat treatment quality of P92 high-temperature pipeline - Google Patents
Method for improving on-site postweld heat treatment quality of P92 high-temperature pipeline Download PDFInfo
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- CN112195333A CN112195333A CN202011145518.6A CN202011145518A CN112195333A CN 112195333 A CN112195333 A CN 112195333A CN 202011145518 A CN202011145518 A CN 202011145518A CN 112195333 A CN112195333 A CN 112195333A
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- heat treatment
- temperature
- thermocouple
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000010935 stainless steel Substances 0.000 claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims abstract description 7
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 6
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 6
- PEUPIGGLJVUNEU-UHFFFAOYSA-N nickel silicon Chemical compound [Si].[Ni] PEUPIGGLJVUNEU-UHFFFAOYSA-N 0.000 claims description 6
- 238000003466 welding Methods 0.000 abstract description 13
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 5
- 230000035882 stress Effects 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000010955 niobium Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a method for improving the on-site postweld heat treatment quality of a P92 high-temperature pipeline, which adopts a flexible ceramic resistance heater for heating and a K-type thermocouple as a heat treatment workpiece of a temperature measuring element, and carries out aging for more than 70 hours at the temperature of 750-770 ℃. According to the method for improving the on-site post-welding heat treatment quality of the P92 high-temperature pipeline, in the heat treatment construction process, after the K-type thermocouple is bound and fixed, a small thin stainless steel sheet of 5cm x 5cm is added on the upper layer of the top point of the thermocouple, the thermocouple is prevented from being in direct contact with a heating belt, and the temperature measurement accuracy of the thermocouple is improved. Therefore, the temperature difference (less than 20 ℃) between the inner wall and the outer wall of the P92 pipeline in the constant temperature process of postweld heat treatment and the residual stress at the welded joint after heat treatment are effectively reduced, the impact property of the welding seam is ensured, and the use performance of the material is improved.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to a method for improving the on-site postweld heat treatment quality of a P92 high-temperature pipeline.
Background
The national thermal power generating units develop towards large units and high-capacity water-saving and environment-friendly directions, and supercritical and ultra-supercritical are the leading factors of the development of the thermal power generating units in China, so that the steam temperature and pressure parameters of boilers of the thermal power generating units are improved, and the unit efficiency is improved. The SA213-T92 steel is high alloy ferrite heat resistant steel which is based on SA213-T91 steel and added with 1.7% of tungsten (W), and the content of molybdenum (Mo) is reduced to 0.5%, and the content of boron and nitrogen is alloyed by vanadium and niobium, and the high temperature creep rupture strength of the steel is obviously improved by adding W element. The T92 steel is widely applied to pipelines of main steam, reheating hot sections and the like of supercritical and ultra-supercritical units, and the new challenges are brought to the aspects of welding, heat treatment and the like of the steel.
The metallographic structure of the original P92 steel welded joint is tempered martensite, the main precipitation phase is M23C6 carbide, and high-density dislocation exists in the crystal. For the heat treatment of P92 steel, there is a requirement for the temperature difference between the inner and outer walls, i.e. the temperature difference between the inner and outer walls is guaranteed to be within 20 ℃. In order to meet the requirement, when the on-site heat treatment is carried out, not only the inner wall and outer wall heating devices are adopted to prolong the heat preservation width, but also the inner plugging is carried out as far as possible, and the constant temperature time is also prolonged to ensure that the temperature difference between the inner wall and the outer wall of the welding seam of the thick-wall pipe meets the requirement.
We have therefore proposed a method of improving the quality of the field post-weld heat treatment of P92 high temperature pipes in order to solve the problems set out above.
Disclosure of Invention
The invention aims to provide a method for improving the on-site postweld heat treatment quality of a P92 high-temperature pipeline, which aims to solve the problem that in order to meet the requirement of ensuring the temperature difference between an inner wall and an outer wall to be within 20 ℃, an inner wall and an outer wall heating device is adopted to prolong the heat preservation width during on-site heat treatment, even internal plugging is carried out as far as possible, and the constant temperature time is also prolonged.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving the heat treatment quality of P92 high-temperature pipeline after on-site welding adopts a flexible ceramic resistance heater for heating and a K-type thermocouple as a heat treatment workpiece of a temperature measuring element, and carries out aging for more than 70 hours at the temperature of 750-770 ℃.
Preferably, the flexible ceramic resistance heater and the K-type thermocouple are bound and fixed on the outer side of the pipeline.
Preferably, a small thin stainless steel sheet is added on the top layer of the top point of the K-type thermocouple.
Preferably, the thin stainless steel sheet has a dimension of 5cm by 5 cm.
Preferably, the type K thermocouple is aged at a temperature of 760 ℃ for more than 250 hours.
Preferably, the K-type thermocouple is a thermocouple wire, and the two thermocouple wires are made of nickel chromium and nickel silicon respectively.
Compared with the prior art, the invention has the beneficial effects that: according to the method for improving the on-site post-welding heat treatment quality of the P92 high-temperature pipeline, in the heat treatment construction process, after the K-type thermocouple is bound and fixed, a small thin stainless steel sheet of 5cm x 5cm is added on the upper layer of the top point of the thermocouple, the thermocouple is prevented from being in direct contact with a heating belt, and the temperature measurement accuracy of the thermocouple is improved. Therefore, the temperature difference (less than 20 ℃) between the inner wall and the outer wall of the P92 pipeline in the constant temperature process of postweld heat treatment and the residual stress at the welded joint after heat treatment are effectively reduced, the impact property of the welding seam is ensured, and the use performance of the material is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides the following technical scheme:
example 1
A method for improving the heat treatment quality of P92 high-temperature pipeline after on-site welding adopts a flexible ceramic resistance heater for heating and a K-type thermocouple as a heat treatment workpiece of a temperature measuring element, and carries out aging for more than 70 hours at the temperature of 750-770 ℃.
The flexible ceramic resistance heater is used for heating and the K-type thermocouple is fixedly bound on the outer side of the pipeline, a small thin stainless steel sheet is added on the upper layer of the top point of the K-type thermocouple, and the size of the thin stainless steel sheet is 5cm by 5 cm.
And meanwhile, the K-type thermocouple is aged for more than 250 hours at the temperature of 760 ℃, the K-type thermocouple is a thermocouple wire, and the two thermocouple wires are made of nickel chromium and nickel silicon respectively.
Example 2
A method for improving the quality of the heat treatment of P92 high-temp pipeline after in-situ welding features that a flexible ceramic resistance heater and K-type thermocouple are used as the heat-treating workpiece of temp measuring element, and ageing is carried out at 750 deg.C for 90 hr.
The flexible ceramic resistance heater is used for heating and the K-type thermocouple is fixedly bound on the outer side of the pipeline, a small thin stainless steel sheet is added on the upper layer of the top point of the K-type thermocouple, and the size of the thin stainless steel sheet is 5cm by 5 cm.
And meanwhile, the K-type thermocouple is aged for 350 hours at the temperature of 750 ℃, the K-type thermocouple is a thermocouple wire, and the two thermocouple wires are made of nickel-chromium and nickel-silicon respectively.
In the heat treatment construction process, after the K-type thermocouple is bound and fixed, a small thin stainless steel sheet of 5cm x 5cm is added on the upper layer of the top point of the thermocouple, so that the thermocouple is prevented from being in direct contact with the heating belt, and the temperature measurement accuracy of the thermocouple is improved. Therefore, the temperature difference (less than 20 ℃) between the inner wall and the outer wall of the P92 pipeline in the constant temperature process of postweld heat treatment and the residual stress at the welded joint after heat treatment are effectively reduced, the impact property of the welding seam is ensured, and the use performance of the material is improved.
Example 3
A method for improving the quality of the heat treatment of P92 high-temp pipeline after in-situ welding features that a flexible ceramic resistance heater and K-type thermocouple are used as the heat-treating workpiece of temp measuring element, and ageing is carried out at 760 deg.C for 80 hr.
The flexible ceramic resistance heater is used for heating and the K-type thermocouple is fixedly bound on the outer side of the pipeline, a small thin stainless steel sheet is added on the upper layer of the top point of the K-type thermocouple, and the size of the thin stainless steel sheet is 5cm by 5 cm.
And meanwhile, aging the K-type thermocouple for 300 hours at the temperature of 760 ℃, wherein the K-type thermocouple is a thermocouple wire, and the two thermocouple wires are made of nickel chromium and nickel silicon respectively.
In the heat treatment construction process, after the K-type thermocouple is bound and fixed, a small thin stainless steel sheet of 5cm x 5cm is added on the upper layer of the top point of the thermocouple, so that the thermocouple is prevented from being in direct contact with the heating belt, and the temperature measurement accuracy of the thermocouple is improved. Therefore, the temperature difference (less than 20 ℃) between the inner wall and the outer wall of the P92 pipeline in the constant temperature process of postweld heat treatment and the residual stress at the welded joint after heat treatment are effectively reduced, the impact property of the welding seam is ensured, and the use performance of the material is improved.
Example 4
A method for improving the quality of the on-site postweld heat treatment of a P92 high-temperature pipeline adopts a flexible ceramic resistance heater for heating and a K-type thermocouple as a heat treatment workpiece of a temperature measuring element, and the workpiece is aged for 70 hours at the temperature of 770 ℃.
The flexible ceramic resistance heater is used for heating and the K-type thermocouple is fixedly bound on the outer side of the pipeline, a small thin stainless steel sheet is added on the upper layer of the top point of the K-type thermocouple, and the size of the thin stainless steel sheet is 5cm by 5 cm.
And meanwhile, the K-type thermocouple is aged for 250 hours at the temperature of 770 ℃, the K-type thermocouple is a thermocouple wire, and the two thermocouple wires are made of nickel chromium and nickel silicon respectively.
In the heat treatment construction process, after the K-type thermocouple is bound and fixed, a small thin stainless steel sheet of 5cm x 5cm is added on the upper layer of the top point of the thermocouple, so that the thermocouple is prevented from being in direct contact with the heating belt, and the temperature measurement accuracy of the thermocouple is improved. Therefore, the temperature difference (less than 20 ℃) between the inner wall and the outer wall of the P92 pipeline in the constant temperature process of postweld heat treatment and the residual stress at the welded joint after heat treatment are effectively reduced, the impact property of the welding seam is ensured, and the use performance of the material is improved.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. A method for improving the on-site postweld heat treatment quality of a P92 high-temperature pipeline is characterized by comprising the following steps: the flexible ceramic resistance heater is adopted for heating and the K-type thermocouple is used as a heat treatment workpiece of the temperature measuring element, and the aging is carried out for more than 70 hours at the temperature of 750-770 ℃.
2. The method for improving the quality of the on-site post-weld heat treatment of the P92 high-temperature pipeline according to claim 1, wherein the method comprises the following steps: the flexible ceramic resistance heater and the K-type thermocouple are bound and fixed on the outer side of the pipeline.
3. The method for improving the quality of the on-site post-weld heat treatment of the P92 high-temperature pipeline according to claim 2, wherein the method comprises the following steps: a small thin stainless steel sheet is added on the upper layer of the top point of the K-type thermocouple.
4. The method for improving the quality of the on-site post-weld heat treatment of the P92 high-temperature pipeline according to claim 3, wherein the method comprises the following steps: the thin stainless steel sheet has a dimension of 5cm by 5 cm.
5. The method for improving the quality of the on-site post-weld heat treatment of the P92 high-temperature pipeline according to claim 1, wherein the method comprises the following steps: the type K thermocouple was aged at 760 ℃ for 250 hours or more.
6. The method for improving the quality of the on-site post-weld heat treatment of the P92 high-temperature pipeline according to claim 1, wherein the method comprises the following steps: the K-type thermocouples are thermocouple wires, and the two thermocouple wires are made of nickel chromium and nickel silicon respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011145518.6A CN112195333A (en) | 2020-10-23 | 2020-10-23 | Method for improving on-site postweld heat treatment quality of P92 high-temperature pipeline |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011145518.6A CN112195333A (en) | 2020-10-23 | 2020-10-23 | Method for improving on-site postweld heat treatment quality of P92 high-temperature pipeline |
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| CN202011145518.6A Pending CN112195333A (en) | 2020-10-23 | 2020-10-23 | Method for improving on-site postweld heat treatment quality of P92 high-temperature pipeline |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB884281A (en) * | 1959-03-17 | 1961-12-13 | British Insulated Callenders | Improvements in or relating to thermocouples |
| US3874239A (en) * | 1974-03-04 | 1975-04-01 | Thermo Couple Prod Co | Surface thermocouple |
| CN101724740A (en) * | 2008-10-16 | 2010-06-09 | 天津诚信达金属检测技术有限公司 | Method for heat treatment of P92 steel |
| CN105200224A (en) * | 2015-11-10 | 2015-12-30 | 山东核电设备制造有限公司 | Heat treatment method after local welding of quenched and tempered material super-large container |
| CN105648195A (en) * | 2016-03-08 | 2016-06-08 | 西安热工研究院有限公司 | Method for improving field post-weld heat treatment quality of high-temperature pipes P91 and P92 |
| CN205741134U (en) * | 2016-05-30 | 2016-11-30 | 吉林昊宇电气股份有限公司 | Tee pipe fitting scene local heat treatmet device |
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-
2020
- 2020-10-23 CN CN202011145518.6A patent/CN112195333A/en active Pending
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| US3874239A (en) * | 1974-03-04 | 1975-04-01 | Thermo Couple Prod Co | Surface thermocouple |
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| CN209559338U (en) * | 2019-03-06 | 2019-10-29 | 中国电建集团福建工程有限公司 | A kind of binding-type thermocouple temperature measurement structure |
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Application publication date: 20210108 |