CN115537537A - Heat treatment method for X65Q pipeline pipe with steel pipe wall thickness larger than 25mm - Google Patents
Heat treatment method for X65Q pipeline pipe with steel pipe wall thickness larger than 25mm Download PDFInfo
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- CN115537537A CN115537537A CN202211275790.5A CN202211275790A CN115537537A CN 115537537 A CN115537537 A CN 115537537A CN 202211275790 A CN202211275790 A CN 202211275790A CN 115537537 A CN115537537 A CN 115537537A
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- steel pipe
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- seamless steel
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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
- C21D9/085—Cooling or quenching
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method for an X65Q pipeline pipe with a steel pipe wall thickness of more than 25mm, which takes a hot-rolled seamless steel pipe with a wall thickness of more than 25mm as a raw material, and the seamless steel pipe comprises the following chemical components in percentage by weight: c0.15-0.18; si0.30-0.4; mn1.25-1.35; p is less than or equal to 0.018; s is less than or equal to 0.010; nb0.025-0.040; v0.02-0.04; 0.01 to 0.02 percent of Ti0; the balance of matrix Fe and undetected trace impurity elements; the process flow comprises the following steps: hot-rolled seamless steel pipe → heating of a quenching furnace → heat preservation of the quenching furnace → tapping → water quenching → heating of a tempering furnace → soaking of the tempering furnace → heat preservation of the tempering furnace → tapping → air cooling → sampling at the head and tail ends → detection and analysis. The product of the invention has the characteristics of low production cost, energy saving, environmental protection, stable mechanical property of the steel pipe and good matching of the toughness and the toughness.
Description
Technical Field
The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to a heat treatment method for an X65Q pipeline pipe with a steel pipe wall thickness of more than 25 mm.
Background
In the last decade, the oil and gas supply and pipeline construction in China have been developed in a crossing manner. In addition to applications in the chemical industry and the petroleum industry, pipeline pipes are also widely used in heating and water supply systems of large-scale plants. In urban construction, the pipeline is also used as a carrier for transporting gas and natural gas, and provides a clean, environment-friendly, efficient and energy-saving new energy source for cities. Meanwhile, along with the continuous development of the petroleum and natural gas industry, the unconventional oil gas resource accounts for more and more, and research, development and application of high-performance oil gas conveying pipes, such as high-strength steel pipes and thick-wall pipe pipes, need to be developed in an effort to ensure the safe operation of the oil gas conveying pipes.
The invention aims to provide a heat treatment method for an X65Q pipeline pipe with a steel pipe wall thickness of more than 25mm, aiming at the problems that the pipeline pipe has low C content and strict limitation on carbon equivalent, and is required to have good welding performance, high strength and good toughness, and a thick-wall pipeline pipe is required to have better hardenability and product performance stability.
Disclosure of Invention
The invention aims to provide a heat treatment manufacturing method which has low production cost, the wall thickness of a steel pipe is more than 25mm, and the performance of a product after quenching and tempering heat treatment meets the requirement of an X65Q pipeline pipe.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a heat treatment method for an X65Q pipeline pipe with a steel pipe wall thickness of more than 25mm, which adopts a hot-rolled seamless steel pipe with a wall thickness of more than 25mm as a raw material, wherein the seamless steel pipe comprises the following chemical components in percentage by weight: c0.15-0.18; si0.30-0.4; mn is 1.25 to 1.35; p is less than or equal to 0.018; s is less than or equal to 0.010; 0.025-0.040% Nb; v0.02-0.04; 0.01 to 0.02 percent of Ti; the balance of matrix Fe and undetected trace impurity elements; the process flow comprises the following steps: hot-rolled seamless steel pipe → heating of a quenching furnace → heat preservation of the quenching furnace → tapping → water quenching → heating of a tempering furnace → soaking of the tempering furnace → heat preservation of the tempering furnace → tapping → air cooling → sampling at the head and tail ends → detection and analysis.
Further, the temperature of the heat preservation section of the quenching furnace of the seamless steel pipe is 900-920 ℃, and the heat preservation is carried out for 3-7 minutes; furthermore, the temperature of the heat preservation section of the quenching furnace of the seamless steel pipe is 910 ℃, and the heat preservation is carried out for 5 minutes.
Further, the seamless steel pipe is taken out of the quenching furnace for water quenching heat treatment, the water spraying amount of an inner nozzle at the head end of the steel pipe is 3600m3/h, and the water spraying amount of an outer spraying pipe is 3800m 3 And h, starting internal spraying after starting external spraying for 3 seconds, wherein the external spraying and the internal spraying are both carried out for 40 seconds, the rotating speed of a radial wheel is 30 revolutions per minute, and cooling the seamless steel pipe to be below 100 ℃.
Further, heating the seamless steel pipe to 650 ℃ for soaking and heat preservation, wherein the total time is controlled to 140 minutes from the heating section to the heat preservation section, and the furnace temperature is controlled to 650 +/-10 ℃.
Furthermore, a product with a wall thickness of more than 25mm and a non-API 5L standard is produced, so that the carbon equivalent CEIIW in the steel is less than or equal to 0.43, and the seamless steel pipe is subjected to water quenching and tempering heat treatment, and the mechanical properties of the steel pipe reach the following levels: yield strength: 450 to 600MPa; tensile strength: 535 to 760MPa; yield ratio: less than or equal to 0.88; elongation percentage: not less than 25%; -transverse impact value at 20 ℃: AKV is more than or equal to 50J/cm 2 (ii) a Grain size: not less than 8.0 grade.
Compared with the prior art, the invention has the beneficial technical effects that:
(1) the seamless steel pipe for the hot-rolled X65Q pipeline adopts the combination of C + Mn + Nb + V + Ti alloying elements to produce a non-API 5L standard product with the wall thickness of more than 25mm, so that the carbon equivalent CE in the steel IIW ≤0.43。
(2) After the tempering heat treatment of the seamless steel pipe is finished, the seamless steel pipe is discharged from a furnace for air cooling, and the economical thick-wall pipeline seamless steel pipe which is produced by combining C + Mn + Nb + V + Ti alloying elements and is not in API 5L standard is subjected to water quenching and tempering heat treatment, so that the steel pipe has excellent performances, and the specific performance indexes are as follows:
yield strength: 450 to 600MPa; tensile strength: 535-760 MPa; yield ratio: less than or equal to 0.88; elongation percentage: not less than 25%; -transverse impact value at 20 ℃: AKV is more than or equal to 50J/cm2; grain size: not less than 8.0 grade.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a photograph of the microstructure of example 1;
FIG. 2 is a photograph of the microstructure of example 2;
FIG. 3 is a photograph of the microstructure of example 3.
Detailed Description
The present invention will be described in further detail with reference to examples 1 to 3.
Rolling qualified seamless steel tube for hot-rolled X65Q pipeline to ensure that the carbon equivalent CE in the steel IIW ≤0.43。
The production process flow sequence is as follows: hot-rolled seamless steel pipe → heating of a quenching furnace → heat preservation of the quenching furnace → tapping → water quenching → heating of a tempering furnace → soaking of the tempering furnace → heat preservation of the tempering furnace → tapping → air cooling → sampling at the head and tail ends → detection and analysis.
The specific production process flow is briefly described as follows:
1. rolling qualified seamless steel pipe for hot-rolled X65Q pipeline to ensure that the carbon equivalent CE in the steel IIW ≤0.43。
2. And (3) putting the seamless steel pipe into a quenching furnace, heating the seamless steel pipe to 910 ℃ after passing through a heating section and a heat preservation section, and preserving heat for 5 minutes.
3. The seamless steel pipe is taken out of the quenching furnace for water quenching heat treatment, and the water spraying quantity of the nozzle in the head end of the steel pipe is 3600m 3 The external water spraying amount of the external water spraying pipe is 3800m 3 Starting internal spraying water after starting external spraying water for 3 seconds, wherein the time of both external spraying and internal spraying is 40 seconds, the rotating speed of a radial wheel is 30 revolutions per minute, and cooling the seamless steel pipe to be below 100 ℃; .
4. Heating the seamless steel pipe to 650 ℃ for soaking and heat preservation, wherein the total time is controlled to be 140 minutes from the heating section to the heat preservation section, and the furnace temperature is controlled to be +/-10 ℃; .
5. And discharging the seamless steel tube out of the furnace for air cooling after the tempering heat treatment of the seamless steel tube is finished.
6. And respectively taking 300mm pipe end samples at the head end and the tail end of the seamless steel pipe after the heat treatment for mechanical property and microstructure analysis.
After heat treatment, sampling the seamless steel tube for the pipeline with the specification of phi 406.4mm multiplied by 26.19mm multiplied by 12000mm (the outer diameter of the steel tube multiplied by the wall thickness of the steel tube multiplied by the length of the steel tube) multiplied by 65Q, and carrying out chemical examination, wherein the chemical component test result (weight percentage content) is shown in table 2, the mechanical property test result is shown in table 3, the metallographic property test result is shown in table 4, and the microstructure picture is shown in fig. 1-3.
TABLE 2 chemical composition test results (wt%) of tube blanks
TABLE 3 mechanical Property test results of seamless steel pipes
| R t0.5 (MPa) | R m (MPa) | R t0.5 /R m | A(％) | A KV (-20 ℃, transverse, J/cm) 2 ) | |
| Example 1 | 515 | 612 | 0.84 | 30 | 80，78，85 |
| Example 2 | 523 | 630 | 0.83 | 31 | 91，83，86 |
| Example 3 | 525 | 629 | 0.83 | 31 | 90，87，91 |
TABLE 4 metallographic examination of the seamless steel tubes (grade)
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A heat treatment method for an X65Q pipeline pipe with a steel pipe wall thickness of more than 25mm is characterized in that the heat treatment method is a hot-rolled seamless steel pipe with a wall thickness of more than 25mm, and the seamless steel pipe comprises the following chemical components in percentage by weight: 0.15 to 0.18 percent of C; 0.30 to 0.4 percent of Si; 1.25 to 1.35 percent of Mn; p is less than or equal to 0.018 percent; s is less than or equal to 0.010 percent; nb0.025-0.040%; v0.02-0.04%; 0.01 to 0.02 percent of Ti; the balance of matrix Fe and undetected trace impurity elements; the process flow comprises the following steps: hot-rolled seamless steel pipe → heating of a quenching furnace → heat preservation of the quenching furnace → tapping → water quenching → heating of a tempering furnace → soaking of the tempering furnace → heat preservation of the tempering furnace → tapping → air cooling → sampling at the head and tail ends → detection and analysis.
2. The heat treatment method for the X65Q pipeline pipe with the steel pipe wall thickness of more than 25mm according to claim 1, wherein the temperature of the heat preservation section of the seamless steel pipe quenching furnace is 900-920 ℃, and the heat preservation is carried out for 3-7 minutes.
3. The heat treatment method for the X65Q pipeline pipe with the steel pipe wall thickness of more than 25mm according to claim 1, characterized in that the seamless steel pipe is taken out of a quenching furnace for water quenching heat treatment, the water spraying amount of an inner nozzle at the head end of the steel pipe is 3600m3/h, the water spraying amount of an outer spraying pipe is 3800m3/h, the inner water spraying is started after the outer spraying water is started for 3 seconds, the time of the outer spraying and the time of the inner spraying are both 40 seconds, the rotating speed of a radial wheel is 30 revolutions per minute, and the seamless steel pipe is cooled to be below 100 ℃.
4. The heat treatment method for X65Q pipeline pipes with steel pipe wall thickness of more than 25mm according to claim 1, characterized in that the seamless steel pipe is heated to 650 ℃ for soaking and heat preservation, the total time from heating to heat preservation is controlled at 140 minutes, and the furnace temperature is controlled at 650 ℃ +/-10 ℃.
5. The heat treatment method for the X65Q pipeline pipe with the steel pipe wall thickness of more than 25mm according to claim 1, characterized in that a product with the wall thickness of more than 25mm and the non-API 5L standard is produced, so that the carbon equivalent CEIIW in the steel is less than or equal to 0.43, the seamless steel pipe is subjected to water quenching and quenching heat treatment, and the mechanical properties of the steel pipe reach the following values: yield strength: 450 to 600MPa; tensile strength: 535 to 760MPa; yield ratio: less than or equal to 0.88; elongation percentage: not less than 25%; -transverse impact value at 20 ℃: AKV is more than or equal to 50J/cm 2 (ii) a CrystalGranularity: not less than 8.0 grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211275790.5A CN115537537A (en) | 2022-10-18 | 2022-10-18 | Heat treatment method for X65Q pipeline pipe with steel pipe wall thickness larger than 25mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211275790.5A CN115537537A (en) | 2022-10-18 | 2022-10-18 | Heat treatment method for X65Q pipeline pipe with steel pipe wall thickness larger than 25mm |
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| Publication Number | Publication Date |
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| CN115537537A true CN115537537A (en) | 2022-12-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211275790.5A Pending CN115537537A (en) | 2022-10-18 | 2022-10-18 | Heat treatment method for X65Q pipeline pipe with steel pipe wall thickness larger than 25mm |
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| Country | Link |
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| CN (1) | CN115537537A (en) |
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- 2022-10-18 CN CN202211275790.5A patent/CN115537537A/en active Pending
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