CN112029983A - Postweld heat treatment process for martensite heat-resistant steel G115 large-diameter thick-wall pipeline - Google Patents
Postweld heat treatment process for martensite heat-resistant steel G115 large-diameter thick-wall pipeline Download PDFInfo
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- CN112029983A CN112029983A CN202010910014.2A CN202010910014A CN112029983A CN 112029983 A CN112029983 A CN 112029983A CN 202010910014 A CN202010910014 A CN 202010910014A CN 112029983 A CN112029983 A CN 112029983A
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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
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
- C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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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
- C21D11/00—Process control or regulation for heat treatments
Abstract
The invention relates to the technical field of G115 large-diameter thick-wall pipelines, in particular to a postweld heat treatment process for a martensite heat-resistant steel G115 large-diameter thick-wall pipeline, which comprises the following steps: (1) and performing low-temperature protection immediately after welding. (2) And immediately performing first high-temperature tempering on the welding seam after the low-temperature heat preservation is finished, wherein the tempering temperature is 740-760 ℃, the heat preservation time is 2.5-3.3min/mm, and cooling after the heat preservation is finished, namely finishing the first high-temperature tempering. (3) And carrying out nondestructive flaw detection on the welding seam, and confirming that the welding seam is free of defects. (4) And (3) cleaning the surface of the welded joint, and performing high-temperature tempering for the second time, wherein the process is the same as the step (2). Aiming at the problem of insufficient toughness of the welded joint of the martensite heat-resistant steel G115 large-diameter thick-wall pipeline, the invention adopts a twice high-temperature tempering heat treatment method to ensure the toughness while ensuring the strength of the welded joint, and has strong functionality, convenience and practicability.
Description
Technical Field
The invention relates to the technical field of G115 large-diameter thick-wall pipelines, in particular to a postweld heat treatment process for a martensite heat-resistant steel G115 large-diameter thick-wall pipeline.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
G115 is used as a new material developed for a 630-650 ℃ high-parameter ultra-supercritical unit in China, and compared with SA-335P92, the new material has excellent performance indexes, so that the new material becomes the only candidate material of the main steam pipeline of the first 630 ℃ ultra-supercritical unit in the world at present.
At present, the research on 9Cr-3W-3Co series martensite heat-resistant steel relevant at home and abroad is basically in the research and development stage and the performance research before trial use. The G115 serving as a candidate material for a main steam pipeline of a demonstration project of a first 630-DEG C ultra-supercritical secondary reheating unit in the world is in a test verification stage before popularization at present, and a welding and heat treatment process of G115 steel is also in a research stage. At present, the main defects of the welding and the heat treatment of the large-diameter thick-wall pipeline made of the novel martensite heat-resistant steel G115 are as follows: after the postweld heat treatment, the impact toughness of the welded joint is low, and particularly the impact toughness of the welding seam in the inner wall area of the pipeline can not meet the performance requirement.
Disclosure of Invention
Aiming at the problems, the invention provides a postweld heat treatment process for a martensite heat-resistant steel G115 large-diameter thick-wall pipeline, which is suitable for postweld heat treatment of a novel martensite heat-resistant steel G115 large-diameter thick-wall pipeline of a 630 ℃ parameter ultra-supercritical unit and can effectively overcome the problem of insufficient toughness of a welded joint after high-temperature tempering heat treatment of a pipeline welded joint. In order to achieve the purpose, the invention adopts the following technical scheme.
A post-welding heat treatment process for a martensite heat-resistant steel G115 large-diameter thick-wall pipeline comprises the following steps:
(1) immediately performing postweld low-temperature protection after welding: heating the welding joint to 100-120 ℃, and then coating the welding seam of the joint with a heat preservation component for low-temperature heat preservation.
(2) And immediately carrying out first high-temperature tempering on the welding seam after the low-temperature heat preservation is finished, wherein the heating width is not less than 5 times of the wall thickness of each side by taking the welding seam as the center, the tempering temperature is 740-760 ℃, the heat preservation time is 2.5-3.3min/mm, and the temperature is reduced after the heat preservation is finished, namely the first high-temperature tempering is finished.
(3) And carrying out nondestructive flaw detection on the welding seam, and confirming that the welding seam is free of defects.
(4) And (3) cleaning the surface of the welded joint, and performing high-temperature tempering for the second time, wherein the process is the same as the step (2).
Further, in the step (1), the heat insulation component is heat insulation cotton which has good flexibility and heat insulation performance, and the circular welding seam can be wrapped in the heat insulation component to insulate the welding seam.
Further, in the step (1), the heating is carried out by adopting a flexible ceramic resistance heater, and the low-temperature heat preservation time is 1.8-2.1 hours. The annular welding line can be uniformly heated at the same time by adopting a heating mode of the flexible ceramic resistor, and the welding line can reach the set temperature at all positions at the same time.
Further, in the step (2), the first high-temperature tempering is carried out by heating to 740-760 ℃ by adopting a medium-frequency induction heating device, and the temperature rise speed is not more than 60 ℃/h.
Furthermore, the gap between an induction coil of the medium-frequency induction heating device and the pipeline is within a control range of 10-80 mm.
Further, in the step (2), the heat preservation adopts a mode that the joint welding line is wrapped in heat preservation cotton.
Further, in the step (2), the thickness of the heat insulation cotton is not less than 40mm, and the heat insulation width is not less than 7 times of the wall thickness of each side of the center of the welding line.
Further, in the step (2), the cooling speed is not more than 60 ℃/h.
Further, in the step (2), if the first tempering treatment cannot be immediately performed after the low-temperature heat preservation is completed, a post-heating process is required when the first tempering treatment is subsequently required, preferably, the heating temperature of the post-heating process is 300-400 ℃, and the heat preservation time is 2 hours.
Compared with the prior art, the invention has the following beneficial effects:
(1) aiming at the problem of insufficient toughness of the welding joint of the novel martensite heat-resistant steel G115 large-diameter thick-wall pipeline, the invention adopts a twice high-temperature tempering heat treatment method to ensure the toughness while ensuring the strength of the welding joint, and has strong functionality, convenience and practicability.
(2) According to the invention, a nondestructive testing procedure is added after the first high-temperature tempering heat treatment of the novel martensite heat-resistant steel G115 large-diameter thick-wall pipeline welding joint, the problem of repairing the welding joint defect is avoided to be subjected to high-temperature tempering treatment again, the maximum two high-temperature tempering heat treatments of one welding joint are ensured, and multiple high-temperature tempering treatments are prevented.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out according to conventional conditions or according to conditions recommended by the manufacturers.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The reagents or starting materials used in the present invention can be purchased from conventional sources, and unless otherwise specified, the reagents or starting materials used in the present invention can be used in a conventional manner in the art or in accordance with the product specifications. In addition, any methods and materials similar or equivalent to those described herein can be used in the methods of the present invention. The preferred methods and materials described in this invention are exemplary only. The invention will now be further illustrated with reference to specific examples.
As mentioned above, the welding and heat treatment of the large-diameter thick-wall pipeline of the novel martensitic heat-resistant steel G115 mainly have the following defects: after the postweld heat treatment, the impact toughness of the welded joint is low, and particularly the impact toughness of the welding seam in the inner wall area of the pipeline can not meet the performance requirement. Therefore, the invention provides a post-welding heat treatment process for a martensite heat-resistant steel G115 large-diameter thick-wall pipeline, and the invention is further explained by combining a specific embodiment.
First embodiment
A heat treatment process for the welded martensite refractory steel G115 large-diameter thick-wall pipeline with wall thickness of 115mm and diameter d of 530 mm. Specifically, the post-weld heat treatment process comprises the steps of:
(1) immediately performing postweld low-temperature protection on the welding seam after welding is completed: a flexible ceramic resistance heater is adopted to surround a welding seam for a circle, a measurement and control thermocouple is arranged at the welding seam, the welding seam is heated to 105-110 ℃, and then heat insulation cotton is used for wrapping the welding seam in the welding seam for low-temperature protection for 2 hours.
(2) After the low-temperature protection in the step (1), dismantling the heat preservation cotton, the flexible ceramic resistance heater and the measurement and control thermocouple, arranging a medium-frequency induction heating device at the welding seam, wherein the gap between the induction coil and the welding seam is 40mm, and preparing to enter a first high-temperature tempering process after the completion.
(3) Starting a first high-temperature tempering treatment: the heating width of the medium-frequency induction heating device is not less than 5 times of the wall thickness of each side by taking the welding seam as a center, the heating speed is not more than 60 ℃/h, the welding seam is heated to 740-760 ℃, then the welding seam is wrapped in heat-preserving cotton with the thickness of 40mm for heat preservation, the heat-preserving time is calculated according to 3min/mm (the perimeter of the welding seam), and the wall thickness of each side of the heat-preserving width is not less than 7 times of the wall thickness.
(4) And after the first high-temperature tempering heat treatment is finished, carrying out nondestructive inspection and confirming that the welding line is free of defects.
(5) And (4) cleaning the surface of the welded joint, and performing secondary high-temperature tempering treatment, wherein the treatment process is the same as the step (3), and obtaining the steel.
Second embodiment
A heat treatment process for the welded martensite refractory steel G115 large-diameter thick-wall pipeline with wall thickness of 115mm and diameter d of 530 mm. Specifically, the post-weld heat treatment process comprises the steps of:
(1) immediately performing postweld low-temperature protection on the welding seam after welding is completed: a flexible ceramic resistance heater is adopted to surround a welding seam for a circle, a measurement and control thermocouple is arranged at the welding seam, the welding seam is heated to 100-110 ℃, and then heat insulation cotton is used for wrapping the welding seam in the welding seam for low-temperature protection for 2.1 hours.
(2) After the low-temperature protection in the step (1), dismantling the heat preservation cotton, the flexible ceramic resistance heater and the measurement and control thermocouple, arranging a medium-frequency induction heating device at a welding seam, wherein the gap between an induction coil and the welding seam is 10mm, and preparing to enter a first high-temperature tempering process after the completion.
(3) Starting a first high-temperature tempering treatment: the heating width of the medium-frequency induction heating device is not less than 5 times of the wall thickness of each side by taking the welding seam as a center, the heating speed is not more than 60 ℃/h, the welding seam is heated to 740-760 ℃, then the welding seam is wrapped in heat-preserving cotton with the thickness of 40mm for heat preservation, the heat-preserving time is calculated according to 3min/mm (the perimeter of the welding seam), and the wall thickness of each side of the heat-preserving width is not less than 7 times of the wall thickness.
(4) And after the first high-temperature tempering heat treatment is finished, carrying out nondestructive inspection and confirming that the welding line is free of defects.
(5) And (4) cleaning the surface of the welded joint, and performing secondary high-temperature tempering treatment, wherein the treatment process is the same as the step (3), and obtaining the steel.
Third embodiment
A heat treatment process for the welded martensite refractory steel G115 large-diameter thick-wall pipeline with wall thickness of 115mm and diameter d of 530 mm. Specifically, the post-weld heat treatment process comprises the steps of:
(1) immediately performing postweld low-temperature protection on the welding seam after welding is completed: a flexible ceramic resistance heater is adopted to surround a welding seam for a circle, a measurement and control thermocouple is arranged at the welding seam, the welding seam is heated to 115-120 ℃, and then heat insulation cotton is used for wrapping the welding seam in the welding seam for low-temperature protection for 1.8 hours.
(2) After the low-temperature protection in the step (1), dismantling the heat preservation cotton, the flexible ceramic resistance heater and the measurement and control thermocouple, arranging a medium-frequency induction heating device at the welding seam, wherein the gap between the induction coil and the welding seam is 80mm, and preparing to enter a first high-temperature tempering process after the completion.
(3) Starting a first high-temperature tempering treatment: the heating width of the medium-frequency induction heating device is not less than 5 times of the wall thickness of each side by taking the welding seam as a center, the heating speed is not more than 60 ℃/h, the welding seam is heated to 740-760 ℃, then the welding seam is wrapped in heat-preserving cotton with the thickness of 44mm for heat preservation, the heat-preserving time is calculated according to 3min/mm (the perimeter of the welding seam), and the wall thickness of each side of the heat-preserving width is not less than 7 times of the wall thickness.
(4) And after the first high-temperature tempering heat treatment is finished, carrying out nondestructive inspection and confirming that the welding line is free of defects.
(5) And (4) cleaning the surface of the welded joint, and performing secondary high-temperature tempering treatment, wherein the treatment process is the same as the step (3), and obtaining the steel.
First comparative example
A heat treatment process for the welded martensite refractory steel G115 large-diameter thick-wall pipeline with wall thickness of 115mm and diameter d of 530 mm. Specifically, the post-weld heat treatment process comprises the steps of:
(1) immediately performing postweld low-temperature protection on the welding seam after welding is completed: a flexible ceramic resistance heater is adopted to surround a welding seam for a circle, a measurement and control thermocouple is arranged at the welding seam, the welding seam is heated to 105-110 ℃, and then heat insulation cotton is used for wrapping the welding seam in the welding seam for low-temperature protection for 2 hours.
(2) After the low-temperature protection in the step (1), dismantling the heat preservation cotton, the flexible ceramic resistance heater and the measurement and control thermocouple, arranging a medium-frequency induction heating device at the welding seam, wherein the gap between the induction coil and the welding seam is 40mm, and preparing to enter a first high-temperature tempering process after the completion.
(3) Starting a first high-temperature tempering treatment: the heating width of the medium-frequency induction heating device is not less than 5 times of the wall thickness of each side by taking the welding seam as a center, the heating speed is not more than 60 ℃/h, the welding seam is heated to 740-760 ℃, then the welding seam is wrapped in heat-preserving cotton with the thickness of 40mm for heat preservation, the heat-preserving time is calculated according to 3min/mm (the perimeter of the welding seam), and the wall thickness of each side of the heat-preserving width is not less than 7 times of the wall thickness.
(4) And after the first high-temperature tempering heat treatment is finished, carrying out nondestructive inspection, and confirming that the welding line is free of defects, thus obtaining the steel.
Second comparative example
A heat treatment process for the welded martensite refractory steel G115 large-diameter thick-wall pipeline with wall thickness of 115mm and diameter d of 530 mm. Specifically, the post-weld heat treatment process comprises the steps of:
(1) immediately performing postweld low-temperature protection on the welding seam after welding is completed: a flexible ceramic resistance heater is adopted to surround a welding seam for a circle, a measurement and control thermocouple is arranged at the welding seam, the welding seam is heated to 100-110 ℃, and then heat insulation cotton is used for wrapping the welding seam in the welding seam for low-temperature protection for 2.1 hours.
(2) After the low-temperature protection in the step (1), dismantling the heat preservation cotton, the flexible ceramic resistance heater and the measurement and control thermocouple, arranging a medium-frequency induction heating device at a welding seam, wherein the gap between an induction coil and the welding seam is 10mm, and preparing to enter a first high-temperature tempering process after the completion.
(3) Starting a first high-temperature tempering treatment: the heating width of the medium-frequency induction heating device is not less than 5 times of the wall thickness of each side by taking the welding seam as a center, the heating speed is not more than 60 ℃/h, the welding seam is heated to 740-760 ℃, then the welding seam is wrapped in heat-preserving cotton with the thickness of 40mm for heat preservation, the heat-preserving time is calculated according to 3min/mm (the perimeter of the welding seam), and the wall thickness of each side of the heat-preserving width is not less than 7 times of the wall thickness.
(4) And after the first high-temperature tempering heat treatment is finished, carrying out nondestructive inspection, and confirming that the welding line is free of defects, thus obtaining the steel.
Third comparative example
A heat treatment process for the welded martensite refractory steel G115 large-diameter thick-wall pipeline with wall thickness of 115mm and diameter d of 530 mm. Specifically, the post-weld heat treatment process comprises the steps of:
(1) immediately performing postweld low-temperature protection on the welding seam after welding is completed: a flexible ceramic resistance heater is adopted to surround a welding seam for a circle, a measurement and control thermocouple is arranged at the welding seam, the welding seam is heated to 115-120 ℃, and then heat insulation cotton is used for wrapping the welding seam in the welding seam for low-temperature protection for 1.8 hours.
(2) After the low-temperature protection in the step (1), dismantling the heat preservation cotton, the flexible ceramic resistance heater and the measurement and control thermocouple, arranging a medium-frequency induction heating device at the welding seam, wherein the gap between the induction coil and the welding seam is 80mm, and preparing to enter a first high-temperature tempering process after the completion.
(3) Starting a first high-temperature tempering treatment: the heating width of the medium-frequency induction heating device is not less than 5 times of the wall thickness of each side by taking the welding seam as a center, the heating speed is not more than 60 ℃/h, the welding seam is heated to 740-760 ℃, then the welding seam is wrapped in heat-preserving cotton with the thickness of 44mm for heat preservation, the heat-preserving time is calculated according to 3min/mm (the perimeter of the welding seam), and the wall thickness of each side of the heat-preserving width is not less than 7 times of the wall thickness.
(4) And after the first high-temperature tempering heat treatment is finished, carrying out nondestructive inspection, and confirming that the welding line is free of defects, thus obtaining the steel.
The welds made in the above examples and comparative examples were sampled and made into standard specimens for impact toughness testing, and the results showed an improvement of 74.7% in the first example, 82.6% in the second example and 78.1% in the third example over the first comparative example. It can be seen that the toughness of the welded joint can be obviously improved by the postweld heat treatment process, and other various performances also meet the requirements of the T/CISA 003-2017 standard.
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 changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A postweld heat treatment process for a martensite heat-resistant steel G115 large-diameter thick-wall pipeline is characterized by comprising the following steps:
(1) immediately performing postweld low-temperature protection after welding: heating the welding joint to 100-120 ℃, and then coating the welding seam of the joint with a heat preservation component for low-temperature heat preservation;
(2) immediately carrying out first high-temperature tempering on the welding seam after the low-temperature heat preservation is finished, wherein the heating width is not less than 5 times of the wall thickness of each side by taking the welding seam as the center, the tempering temperature is 740-760 ℃, the heat preservation time is 2.5-3.3min/mm, and the temperature is reduced after the heat preservation is finished, namely the first high-temperature tempering is finished;
(3) carrying out nondestructive flaw detection on the welding seam, and confirming that the welding seam is free of defects;
(4) and (3) cleaning the surface of the welding joint, and performing secondary high-temperature tempering, wherein the process is the same as the step (2).
2. The postweld heat treatment process according to claim 1, wherein in the step (1), the heat-insulating member is heat-insulating cotton.
3. The postweld heat treatment process according to claim 1, wherein in the step (1), the heating is carried out by adopting a flexible ceramic resistance heater, and the low-temperature heat preservation time is 1.8-2.1 hours.
4. The postweld heat treatment process according to claim 1, wherein in the step (2), the first high-temperature tempering is carried out by heating to 740-760 ℃ by using a medium-frequency induction heating device, and the temperature rise speed is not more than 60 ℃/h.
5. The postweld heat treatment process according to claim 1, wherein a gap between an induction coil of the medium frequency induction heating device and the pipeline is within a control range of 10mm to 80 mm.
6. The postweld heat treatment process of claim 1, wherein in step (2), the heat preservation is performed in a manner that the joint weld is wrapped with heat-preservation cotton.
7. The postweld heat treatment process according to claim 1, wherein in the step (2), the thickness of the heat-insulating cotton is not less than 40mm, and the heat-insulating width is not less than 7 times of the wall thickness of each side of the center of the weld joint.
8. The postweld heat treatment process according to claim 1, wherein, in the step (2), the cooling rate is not more than 60 ℃/h.
9. The postweld heat treatment process according to any one of claims 1 to 8, wherein in the step (2), if the first tempering treatment cannot be immediately performed after the low-temperature heat preservation is completed, the postheat treatment is performed when the first tempering treatment is subsequently performed.
10. The postweld heat treatment process according to claim 9, wherein the postheat process is carried out at a heating temperature of 300 ℃ to 400 ℃ and a holding time of 2 hours.
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Application publication date: 20201204 |