CN112111641A - Heat treatment method of thick-wall L80-13Cr seamless steel tube - Google Patents
Heat treatment method of thick-wall L80-13Cr seamless steel tube Download PDFInfo
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- CN112111641A CN112111641A CN202011050873.5A CN202011050873A CN112111641A CN 112111641 A CN112111641 A CN 112111641A CN 202011050873 A CN202011050873 A CN 202011050873A CN 112111641 A CN112111641 A CN 112111641A
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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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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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
- C21D1/62—Quenching devices
- C21D1/63—Quenching devices for bath 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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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
- C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
The invention relates to a heat treatment method of a thick-wall L80-13Cr seamless steel pipe, which comprises the following steps: the method comprises the steps of heating a seamless steel pipe to 980-1010 ℃ in a quenching furnace to complete an austenitizing process of a structure; horizontally placing the seamless steel pipe on a rotary riding wheel above a water tank filled with circulating water, and rotating the rotary riding wheel and simultaneously opening an inner nozzle to spray the circulating water; thirdly, the supporting wheel is rotated to drive the seamless steel tube to rotate, and the supporting wheel gradually sinks to one half to two thirds to sink below the water surface; and fourthly, rapidly conveying the seamless steel pipe after water discharging to a cooling bed, and performing air blowing cooling by using an axial flow fan to perform tempering treatment. The invention optimizes the heat treatment process of the seamless steel pipe, overcomes the defects of difficult through quenching, easy aging and difficult cleaning in the traditional quenching method, is beneficial to improving the quality of the thick-wall L80-13Cr seamless steel pipe after heat treatment and reducing the production cost.
Description
Technical Field
The invention belongs to the technical field of metal heat treatment, and relates to a heat treatment method of a thick-wall L80-13Cr seamless steel pipe.
Background
The L80-13Cr is steel for petroleum and natural gas exploitation, has good carbon dioxide corrosion resistance and seawater corrosion resistance, is a corrosion-resistant alloy with low cost, and is widely applied to L80-13Cr seamless steel pipes in oil and gas field exploitation. L80-13Cr is required to have not only the 80KSI strength properties of API5CT, but also good toughness. Heating and austenitizing the seamless steel pipe with the wall thickness of less than 30mm, discharging the seamless steel pipe, adopting air as a quenching medium, and simultaneously forcing the air to flow at a high speed, so that the seamless steel pipe enters a tempering furnace after being cooled to room temperature, and the required mechanical property can be realized; however, 13Cr with a wall thickness of 30mm or more is difficult to be quenched through by heat treatment, so that the performance of both strength and impact toughness is difficult to obtain.
To solve this problem, two heat treatment methods are currently used to obtain the properties of thick walls L80-13 Cr: heating and insulating the seamless steel pipe to ensure complete and uniform austenitizing, discharging the seamless steel pipe out of a furnace, cooling the seamless steel pipe to room temperature by using stirring oil as a quenching medium, and then feeding the seamless steel pipe into a tempering furnace. Secondly, heating and insulating the seamless steel pipe to ensure complete and uniform austenitizing, discharging the seamless steel pipe out of the furnace, taking the quenching liquid synthesized by stirring as a quenching medium, cooling the seamless steel pipe to room temperature, and then entering a tempering furnace.
The adoption of the oil quenching mode can avoid the seamless steel pipe from generating quenching cracks and realize better mechanical performance. However, oil quenching not only needs an oil groove, but also needs a corresponding cooling system, oil is easy to burn and has poor safety, and meanwhile, the oil is easy to age, so that the cost of replacing new oil is increased, the seamless steel pipe after quenching is not easy to clean, and the cleaning procedure is added, so that the cost of oil quenching is higher; good mechanical properties can be obtained when the quenching liquid mode is adopted for cooling, but mass production needs a large amount of synthetic quenching liquid, and the consumption is fast and the cost is high.
Disclosure of Invention
The invention aims to provide a heat treatment method of a thick-wall L80-13Cr seamless steel tube, optimize the heat treatment process of the seamless steel tube, improve the quality of the thick-wall L80-13Cr seamless steel tube after heat treatment and reduce the production cost.
The technical scheme of the invention is as follows: a heat treatment method of a thick-walled L80-13Cr seamless steel pipe, which utilizes a heat treatment device to carry out treatment, and the treatment process comprises the following steps:
the method comprises the following steps: heating the seamless steel pipe to 980-1010 ℃ in a quenching furnace, preserving the heat for 35-50 min after reaching the heating temperature, and finishing the austenitizing process of the structure;
step two: discharging the seamless steel pipe immediately after heat preservation, quickly and horizontally placing the seamless steel pipe on a rotary riding wheel above a water tank filled with circulating water, rotating the rotary riding wheel, simultaneously opening an inner nozzle, and spraying the circulating water into an inner hole of the seamless steel pipe along the axial direction; the rotating speed of the tug is 40-45 rpm/min, and the internal water spraying pressure is 0.10-0.25 MPa;
step three: the rotary riding wheel drives the seamless steel tube to rotate and gradually sinks, so that one half to two thirds of the seamless steel tube body sinks below the water surface, and the internal spraying device sinks along with the riding wheel; when the temperature of the seamless steel pipe is cooled to 220-280 ℃, the riding wheel is rotated to lift up to enable the seamless steel pipe to leave the water surface;
step four: and (3) rapidly conveying the discharged seamless steel pipe to a cooling bed, carrying out air blowing cooling by using an axial flow fan, conveying the seamless steel pipe to a tempering furnace after the temperature of the seamless steel pipe is cooled to be below 60 ℃, and carrying out tempering treatment at 715-725 ℃. The L80-13Cr seamless steel pipe is made of the following materials: the standard material of L80-13Cr in APISpec5 CT.
The diameter of the outer circle of the seamless steel tube is between phi 127 mm and phi 325 mm; the wall thickness is between 30mm and 60 mm. The tensile property of the L80-13Cr seamless steel tube after heat treatment meets the requirement of APISpec5CT, and the transverse impact property at 0 ℃ is more than or equal to 30J.
The heat treatment device comprises a quenching furnace, a cooling water tank, an air cooling bed and a tempering furnace, wherein the quenching furnace, the cooling water tank, the air cooling bed and the tempering furnace are sequentially arranged. The cooling water tank is provided with an inner nozzle and a rotary riding wheel. The rotary riding wheel is used for horizontally placing the seamless steel pipe when cooling, and the inner nozzle is used for spraying circulating water into an inner hole of the seamless steel pipe along the axial direction. The cooling water tank is filled with circulating water, and is provided with a water outlet which is connected to the inner nozzle through a water pump.
The invention has the beneficial effects that: the thick-walled L80-13Cr seamless steel pipe is rapidly cooled above the martensite start temperature, thereby avoiding the transformation from the super-cooled austenite to the pearlite, enabling the super-cooled austenite to rapidly cross the most unstable temperature range, and leading the cooling temperature to reach the martensite start transformation temperature range. The transformation from the super-cooled austenite to the martensite is completed under the air cooling condition, the cooling speed in the martensite transformation process is reduced, the internal stress in the martensite formation process is reduced, and the quenching crack of the seamless steel pipe is avoided. Water and air are used as quenching media to carry out staged quenching, so that the seamless steel pipe is well quenched, and quenching cracks caused by cooling the 13Cr seamless steel pipe in a single aqueous medium are avoided. The method has the advantages that water is used as a quenching medium instead of oil, the cleaning procedure of the seamless steel tube is omitted, the price is low, the operation is convenient, the safety is high, the production cost is reduced, and the production efficiency is improved. The invention optimizes the heat treatment process of the seamless steel pipe, overcomes the defects of difficult through quenching, easy aging and difficult cleaning in the traditional quenching method, is beneficial to improving the quality of the thick-wall L80-13Cr seamless steel pipe after heat treatment and reducing the production cost.
Drawings
FIG. 1 is a schematic flow chart of an apparatus for heat-treating a thick-walled L80-13Cr seamless steel pipe according to the present invention;
FIG. 2 is a schematic view of a cooling water tank;
wherein: 1-inner nozzle, 2-seamless steel tube, 3-rotary riding wheel, 4-circulating water, 5-cooling water tank, 6-quenching furnace, 7-cooling bed and 8-tempering furnace.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
As shown in FIG. 1, the heat treatment apparatus for the thick-walled L80-13Cr seamless steel pipe comprises a quenching furnace 6, a cooling water tank 5, an air-cooled bed 7 and a tempering furnace 8, wherein the quenching furnace, the cooling water tank, the air-cooled bed and the tempering furnace are arranged in sequence. The quenching furnace 6 is communicated with the seamless steel tube bin, and the tempering furnace 8 is communicated with the product bin. As shown in fig. 2, the cooling water tank is provided with an inner nozzle 1 and a rotary idler 3. The rotary riding wheel is used for horizontally placing the seamless steel pipe when cooling, and the inner nozzle 1 is used for spraying circulating water into an inner hole of the seamless steel pipe along the axial direction. The cooling water tank 5 is filled with circulating water 4, and is provided with a water outlet which is connected to the inner nozzle through a water pump.
The quenching furnace 6 consists of a furnace body, a furnace door, a heating element, a ventilation mechanism and a control system. The furnace body is formed by welding profile steel and steel plates, and the inner wall of the furnace lining is connected with the furnace shell into a whole by adopting a stainless steel plate. The heating element is a resistance band or resistance wire made of high resistance alloy. The ventilator consists of blower and air guide plate, and the control part adopts SCR and digital display meter to control and alarm temperature. The furnace door is designed at the lower part of the furnace body, and the opening and closing actions of the furnace door adopt a mechanical transmission mode. The tempering furnace 8 comprises a housing, a ventilator, a furnace lining, furnace doors, heating elements and a control system. The shell is formed by welding steel plates and profile steel, the furnace lining is made of glass fiber, the ventilator is composed of a blower and an air deflector, the heating element is a high-temperature resistance wire or a resistance belt, and the furnace door is a furnace door with a lifting structure. The cooling bed 7 is a slide rail type cooling bed.
The invention carries out heat treatment on the thick-walled L80-13Cr seamless steel pipe. The diameter of the excircle of the seamless steel tube is phi 158mm, the wall thickness is 38.1mm, and the length is 6500 mm. The material is APISpec5CT standard L80-13Cr standard material, and the specific components of the material are shown in Table 1.
TABLE 1 composition of L80-13Cr seamless steel pipe (% by mass)
| C | Mn | Cr | Si | S | P | Cu | Ni | Mo |
| 0.20 | 0.43 | 12.78 | 0.29 | 0.0027 | 0.014 | 0.064 | 0.12 | 0.078 |
The heat treatment method of the thick-wall L80-13Cr seamless steel pipe comprises the following heat treatment steps:
the seamless steel pipe is heated to 990 +/-5 ℃ in a quenching furnace, and heat preservation is carried out for 454min, so that the austenitizing process of the structure is completed;
immediately discharging the seamless steel pipe after heat preservation is finished, quickly placing the seamless steel pipe on a rotary riding wheel 2 above a water tank 5 filled with circulating water 4 shown in figure 2, rotating the rotary riding wheel and simultaneously opening an inner nozzle 1, and spraying the circulating water into an inner hole of an axial seamless steel pipe 12; the rotating speed of the tug is 40-45 rpm/min, and the internal water spraying pressure is 0.20 MPa;
the supporting wheel 4 is rotated to drive the seamless steel tube to rotate, the supporting wheel gradually sinks, one half of the tube body of the seamless steel tube sinks below the water surface, the other half of the tube body leaks above the water surface, and the axis of the inner spray head 1 is always overlapped with the axis of the seamless steel tube; when the temperature of the seamless steel pipe is cooled to 250 ℃, the riding wheel is rotated to lift up to enable the seamless steel pipe to leave the water surface;
and quickly conveying the seamless steel pipe after water is discharged to a cooling bed, carrying out air blowing cooling by using an axial flow fan, conveying the seamless steel pipe to a tempering furnace after the temperature of the seamless steel pipe is cooled to be below 60 ℃, carrying out tempering treatment at 715-725 ℃, and keeping the tempering and heat preservation time at 200 min-210 mmin. Through the quality detection and the performance test,
the thick-wall L80-13Cr seamless steel pipe treated by the heat treatment method of the invention has the following quality: and (3) after quenching, organizing: fine martensite; hardness: HRC 42-48; surface of the tube after quenching: bright and clean and flat; no quenching crack; and (3) tempering the structure: tempered sorbite; hardness: HRC18 ~ 22.
The technical performance after tempering is as follows: the tensile strength is larger than 690MPa, the yield strength is 580-630 MPa, the elongation is 18-23%, and the transverse impact energy at 0 ℃ is 35-60J.
The data show that the thick-wall L80-13Cr seamless steel pipe after the heat treatment method completely meets the tensile property of the L80-13Cr seamless steel pipe after the heat treatment, and meets the requirements of APISpec5CT and the transverse impact property at 0 ℃. The invention carries out staged quenching by using water and air as quenching media, thereby not only realizing good through quenching of the seamless steel pipe, but also avoiding quenching cracks caused by cooling the 13Cr seamless steel pipe in a single aqueous medium. The water is used as a quenching medium instead of oil, so that the cleaning procedure of the seamless steel pipe is omitted. The heat treatment process of the seamless steel pipe is optimized, the defects that the traditional quenching method is not easy to be quenched completely, quenching oil is easy to burn and age, the seamless steel pipe is not easy to clean after quenching, the cost is high and the like are overcome, the quality of the heat-treated thick-wall L80-13Cr seamless steel pipe is improved, and the production cost is reduced.
Claims (5)
1. A heat treatment method of a thick-walled L80-13Cr seamless steel pipe, which is performed by a heat treatment device, is characterized in that: the heat treatment method comprises the following steps:
the method comprises the following steps: heating the seamless steel tube (2) to 980-1010 ℃ in a quenching furnace, preserving the heat for 35-50 min after reaching the heating temperature, and finishing the austenitizing process of the structure;
step two: discharging the seamless steel pipe immediately after heat preservation, quickly and horizontally placing the seamless steel pipe on a rotary riding wheel (3) above a water tank (5) filled with circulating water (4), rotating the rotary riding wheel and simultaneously opening an inner nozzle (1), and spraying the circulating water into an inner hole of the seamless steel pipe (2) along the axial direction;
step three: the rotary riding wheel drives the seamless steel tube to rotate and gradually sinks, so that one half to two thirds of the seamless steel tube body sinks below the water surface, and the internal spraying device sinks along with the riding wheel; when the temperature of the seamless steel pipe is cooled to 220-280 ℃, the riding wheel is rotated to lift up to enable the seamless steel pipe to leave the water surface;
step four: and (3) rapidly conveying the discharged seamless steel pipe to a cooling bed, carrying out air blowing cooling by using an axial flow fan, conveying the seamless steel pipe to a tempering furnace after the temperature of the seamless steel pipe is cooled to be below 60 ℃, and carrying out tempering treatment at 715-725 ℃.
2. The heat treatment method for a thick-walled L80-13Cr seamless steel pipe according to claim 1, wherein: the L80-13Cr seamless steel pipe is made of the following materials: the standard material of L80-13Cr in API Spec5 CT; the diameter of the outer circle of the seamless steel tube is between phi 127 mm and phi 325 mm; the wall thickness is between 30mm and 60 mm.
3. The heat treatment method for a thick-walled L80-13Cr seamless steel pipe according to claim 1, wherein: the tensile property of the L80-13Cr seamless steel tube after heat treatment meets the specification of API Spec5CT, and the transverse impact property at 0 ℃ is more than or equal to 30J.
4. The heat treatment method for a thick-walled L80-13Cr seamless steel pipe according to claim 1, wherein: the heat treatment device comprises a quenching furnace (6), a cooling water tank (5), an air cooling bed (7) and a tempering furnace (8), wherein the quenching furnace, the cooling water tank, the air cooling bed and the tempering furnace are sequentially arranged; the cooling water tank is provided with an inner nozzle (1) and a rotary riding wheel (3); the rotary riding wheel is used for horizontally placing the seamless steel tube during cooling, and the inner nozzle (1) is used for spraying circulating water into an inner hole of the seamless steel tube along the axial direction.
5. The method for heat-treating a thick-walled L80-13Cr seamless steel pipe according to claim 4, wherein: the cooling water tank (5) is filled with circulating water (4), the cooling water tank (5) is provided with a water outlet, and the water outlet is connected to the inner nozzle (1) through a water pump.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807526A (en) * | 2022-04-13 | 2022-07-29 | 大冶特殊钢有限公司 | Heat treatment method of large-size 45CrNiMoV medium-thickness wall seamless steel pipe |
| CN114891980A (en) * | 2022-04-27 | 2022-08-12 | 中材科技(成都)有限公司 | Tempering cooling equipment and method for steel liner gas cylinder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807526A (en) * | 2022-04-13 | 2022-07-29 | 大冶特殊钢有限公司 | Heat treatment method of large-size 45CrNiMoV medium-thickness wall seamless steel pipe |
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| CN114891980A (en) * | 2022-04-27 | 2022-08-12 | 中材科技(成都)有限公司 | Tempering cooling equipment and method for steel liner gas cylinder |
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Application publication date: 20201222 |