CN110157857A - A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum - Google Patents
A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum Download PDFInfo
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- CN110157857A CN110157857A CN201910474204.1A CN201910474204A CN110157857A CN 110157857 A CN110157857 A CN 110157857A CN 201910474204 A CN201910474204 A CN 201910474204A CN 110157857 A CN110157857 A CN 110157857A
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- steel pipe
- seamless steel
- temperature
- high pressure
- slag
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
Abstract
The invention discloses a kind of petroleum manufacturing methods of high pressure resistant seamless steel pipe, comprising the following steps: S1: electric arc furnace smelting；S2:LF external refining；S3:VD vacuum outgas；S4: pipe production；S5: unit rolling；S6: expand system；S7: heat treatment；S8: spraying；S9: curing process；S10: finishing；S11: packaging is checked.The manufacturing method of the high pressure resistant seamless steel pipe of the strict control of the present invention petroleum, material successively passes through electric arc furnace smelting, LF external refining, the processing modes such as VD vacuum outgas, and the seamless steel pipe expanded after making is heat-treated, the seamless steel pipe yield strength of preparation is greater than 395MPa, tensile strength is greater than 525MPa, resistance to pressure pressure is more than 400bar, the petroleum after spray treatment is obviously improved with high pressure resistant seamless steel pipe corrosion resistance simultaneously, the service life of pipeline improves 3-5 times, the hydraulic efficiency of tube wall promotes 15-25% simultaneously, the seamless steel pipe of manufacture can be completely suitable for oil exploitation, it is suitble to be widely popularized.
Description
Technical field
The invention belongs to seamless steel pipe technical fields, and in particular to a kind of manufacturer of the high pressure resistant seamless steel pipe of petroleum
Method.
Background technique
Seamless steel pipe is exactly a vital component part in development of modern industry, is generally divided into cold and hot rolling
It forms, according to the difference of form and cross section, using different in approach.Oil well pipe is the use scope of seamless steel pipe,
Generally applied in oil exploitation.
In manufacturing method of the existing petroleum with high pressure resistant seamless steel pipe, the yield strength of the seamless steel pipe material of preparation
It is general with tensile strength, and pipeline service life in prolonged corrosive environment is lower, and fluid is in pipeline by tube wall
Influence, cause hydraulic efficiency to be difficult to be promoted.
Summary of the invention
The purpose of the present invention is to provide a kind of petroleum manufacturing method of high pressure resistant seamless steel pipe, the seamless steel pipes of preparation
Yield strength is greater than 395MPa, and tensile strength is greater than 525MPa, and resistance to pressure pressure is more than 400bar, while after spray treatment
Petroleum is obviously improved with high pressure resistant seamless steel pipe corrosion resistance, and the service life of pipeline improves 3-5 times, while the fluid of tube wall
Improved efficiency 15-25%, to solve to propose the problems of the prior art in above-mentioned background technique.
To achieve the above object, present invention employs following technical solutions: a kind of system of the high pressure resistant seamless steel pipe of petroleum
Make method, comprising the following steps:
S1: seamless steel pipe raw material is put into electric arc furnaces and smelts by electric arc furnace smelting, smelting temperature 3800-4000
DEG C, raw material is smelted into melt feed；
S2:LF external refining, steps are as follows:
A: submerged arc heating, LF furnace use 3 root graphite electrodes, carry out submerged arc heating, terminal in electrode insertion slag blanket when heating
The accuracy of temperature≤± 5 DEG C；
B: argon gas stirring accelerates the substance between steel-slag to transmit, carries out deoxidation, desulfurization by steel ladle bottom argon blowing gas agitating
Reaction, and promotes the floating of field trash to remove, while accelerating the uniform of liquid steel temperature and ingredient, precisely adjust molten steel at
Point；
C: furnace reduction atmosphere, ladle and bell seal, and graphite electrode oxidation generates C0 gas, and also Primordial Qi is formd in furnace
Atmosphere, molten steel further deoxidation, desulfurization and removal non-metallic inclusion under the reducing conditions, and avoids nitrogen pick-up；
D: white slag refines, and the reducing slag of w (FeO)≤1% is borrowed by the reducing slag of high alkalinity in the white slag of LF furnace refining
Argon gas is helped to stir, diffusive deoxidation, desulfurization and removal non-metallic inclusion；
The molten steel after LF external refining is put into VD type ladle refining furnace in S3:VD vacuum outgas, is carried out to molten steel true
Alloying component fine tuning and argon gas stirring under empty degassing process and vacuum；
S4: the molten steel after VD Fruit storage is poured into mold and seamless steel tube blank material is made by pipe production；
S5: pipe is put on roll mill and carries out hot rolling by unit rolling, and rolling temperature is 700-1100 DEG C；
S6: expanding system, uses needs according to design, carries out expansion system to the seamless steel pipe rolled, and expanding temperature processed is 800-830
DEG C, thermal expansion speed is 50 ± 10mm/min；
S7: heat treatment, steps are as follows:
A: seamless steel pipe feeding stepping transverse moving formula heating furnace is subjected to quenching and tempering, the Quench heating temperature difference is ± 10
DEG C, the tempering heating temperature difference is ± 5 DEG C；
B: seamless steel pipe surface is rinsed using the giant of furnace outlet position, the iron scale on surface is removed；
C: sizing carries out sizing processing to steel pipe on sizing mill, and sizing temperature is 500-680 DEG C；
D: cutting, seamless steel pipe after on laser cutting machine to sizing carry out cutting process；
S8: seamless steel pipe tubing is carried out basecoat paint using epoxy-phenol resin paint, is then toasted by spraying,
Continue to carry out finishing coat spraying using epoxy-phenol resin paint after priming paint toasts cooling completely, then be toasted；
S9: the seamless steel pipe that spraying terminates is put into continuous oven and carries out curing process by curing process, and solidification temperature is
200-240 DEG C, curing time 60min；
S10: finishing cuts off the seamless steel pipe that curing process is completed, tail, trimming, leveling and smooth processing respectively；
S11: it checks packaging, after seamless steel pipe finishing, checks the quality of seamless steel pipe, and packed；
Preferably, the field trash of LF external refining is rated 0-0.1 grades by ASTM in the step S2；The quantity of slag is amount of metal
2~8%.
Preferably, Step d white slag uses AL in the step S22O3-CaO-SiO2It is clinker, cinder inclusion basicity R >=3, in slag
W (FeO+MnO) < 4%.
Preferably, the caliber margin of tolerance of hot rolling is less than 0.01mm in the step S5.
Preferably, the baking temperature of basecoat paint is 120-150 DEG C in the step S8, baking time 50-70min；
The baking temperature of finishing coat spraying is 120-150 DEG C, baking time 50-70min.
A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum proposed by the present invention, compared with prior art, have with
Lower advantage:
1, the manufacturing method of the high pressure resistant seamless steel pipe of the strict control of the present invention petroleum, material successively pass through electric arc furnaces smelting
The processing modes such as refining, LF external refining, VD vacuum outgas, and to expand system after seamless steel pipe be heat-treated, preparation it is seamless
Steel pipe yield strength is greater than 395MPa, and tensile strength is greater than 525MPa, and resistance to pressure pressure is more than 400bar, while passing through spray treatment
Petroleum afterwards is obviously improved with high pressure resistant seamless steel pipe corrosion resistance, 3-5 times of the service life raising of pipeline, while tube wall
Hydraulic efficiency promotes 15-25%, and the seamless steel pipe of manufacture can be completely suitable for oil exploitation, be suitble to be widely popularized.
Detailed description of the invention
Fig. 1 is a kind of process flow chart of the petroleum manufacturing method of high pressure resistant seamless steel pipe of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Herein
Described specific embodiment is only used to explain the present invention, is not intended to limit the present invention.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this hair
The range of bright protection.
Embodiment 1
The present invention provides a kind of petroleum manufacturing methods of high pressure resistant seamless steel pipe, comprising the following steps:
S1: seamless steel pipe raw material is put into electric arc furnaces and smelts by electric arc furnace smelting, and smelting temperature is 3800 DEG C, will
Raw material is smelted into melt feed；
S2:LF external refining, steps are as follows:
A: submerged arc heating, LF furnace use 3 root graphite electrodes, carry out submerged arc heating, terminal in electrode insertion slag blanket when heating
The accuracy of temperature≤± 5 DEG C；
B: argon gas stirring accelerates the substance between steel-slag to transmit, carries out deoxidation, desulfurization by steel ladle bottom argon blowing gas agitating
Reaction, and promotes the floating of field trash to remove, while accelerating the uniform of liquid steel temperature and ingredient, precisely adjust molten steel at
Point；
C: furnace reduction atmosphere, ladle and bell seal, and graphite electrode oxidation generates C0 gas, and also Primordial Qi is formd in furnace
Atmosphere, molten steel further deoxidation, desulfurization and removal non-metallic inclusion under the reducing conditions, and avoids nitrogen pick-up；
D: white slag refines, and the reducing slag of w (FeO)≤1% is borrowed by the reducing slag of high alkalinity in the white slag of LF furnace refining
Argon gas is helped to stir, diffusive deoxidation, desulfurization and removal non-metallic inclusion；
The molten steel after LF external refining is put into VD type ladle refining furnace in S3:VD vacuum outgas, is carried out to molten steel true
Alloying component fine tuning and argon gas stirring under empty degassing process and vacuum；
S4: the molten steel after VD Fruit storage is poured into mold and seamless steel tube blank material is made by pipe production；
S5: pipe is put on roll mill and carries out hot rolling by unit rolling, and rolling temperature is 700 DEG C；
S6: expanding system, uses needs according to design, carries out expansion system to the seamless steel pipe rolled, and expanding temperature processed is 800 DEG C,
Thermal expansion speed is 40mm/min；
S7: heat treatment, steps are as follows:
A: seamless steel pipe feeding stepping transverse moving formula heating furnace is subjected to quenching and tempering, the Quench heating temperature difference is ± 10
DEG C, the tempering heating temperature difference is ± 5 DEG C；
B: seamless steel pipe surface is rinsed using the giant of furnace outlet position, the iron scale on surface is removed；
C: sizing carries out sizing processing to steel pipe on sizing mill, and sizing temperature is 500 DEG C；
D: cutting, seamless steel pipe after on laser cutting machine to sizing carry out cutting process；
S8: seamless steel pipe tubing is carried out basecoat paint using epoxy-phenol resin paint, is then toasted by spraying,
Continue to carry out finishing coat spraying using epoxy-phenol resin paint after priming paint toasts cooling completely, then be toasted；
S9: the seamless steel pipe that spraying terminates is put into continuous oven and carries out curing process by curing process, and solidification temperature is
200 DEG C, curing time 60min；
S10: finishing cuts off the seamless steel pipe that curing process is completed, tail, trimming, leveling and smooth processing respectively；
S11: it checks packaging, after seamless steel pipe finishing, checks the quality of seamless steel pipe, and packed；
The field trash of LF external refining is rated 0 grade by ASTM in the step S2；The quantity of slag is the 2% of amount of metal, described
Step d white slag uses AL in step S22O3-CaO-SiO2It is clinker, cinder inclusion basicity R>=3, w (FeO+MnO)<4% in slag is described
The caliber margin of tolerance of hot rolling in step S5 is less than 0.01mm, and the baking temperature of basecoat paint is 120 DEG C in the step S8, dries
The roasting time is 50min；The baking temperature of finishing coat spraying is 120 DEG C, baking time 50min.
Embodiment 2
The present invention provides a kind of petroleum manufacturing methods of high pressure resistant seamless steel pipe, comprising the following steps:
S1: seamless steel pipe raw material is put into electric arc furnaces and smelts by electric arc furnace smelting, and smelting temperature is 3900 DEG C, will
Raw material is smelted into melt feed；
S2:LF external refining, steps are as follows:
A: submerged arc heating, LF furnace use 3 root graphite electrodes, carry out submerged arc heating, terminal in electrode insertion slag blanket when heating
The accuracy of temperature≤± 5 DEG C；
B: argon gas stirring accelerates the substance between steel-slag to transmit, carries out deoxidation, desulfurization by steel ladle bottom argon blowing gas agitating
Reaction, and promotes the floating of field trash to remove, while accelerating the uniform of liquid steel temperature and ingredient, precisely adjust molten steel at
Point；
C: furnace reduction atmosphere, ladle and bell seal, and graphite electrode oxidation generates C0 gas, and also Primordial Qi is formd in furnace
Atmosphere, molten steel further deoxidation, desulfurization and removal non-metallic inclusion under the reducing conditions, and avoids nitrogen pick-up；
D: white slag refines, and the reducing slag of w (FeO)≤1% is borrowed by the reducing slag of high alkalinity in the white slag of LF furnace refining
Argon gas is helped to stir, diffusive deoxidation, desulfurization and removal non-metallic inclusion；
The molten steel after LF external refining is put into VD type ladle refining furnace in S3:VD vacuum outgas, is carried out to molten steel true
Alloying component fine tuning and argon gas stirring under empty degassing process and vacuum；
S4: the molten steel after VD Fruit storage is poured into mold and seamless steel tube blank material is made by pipe production；
S5: pipe is put on roll mill and carries out hot rolling by unit rolling, and rolling temperature is 900 DEG C；
S6: expanding system, uses needs according to design, carries out expansion system to the seamless steel pipe rolled, and expanding temperature processed is 815 DEG C,
Thermal expansion speed is 50mm/min；
S7: heat treatment, steps are as follows:
A: seamless steel pipe feeding stepping transverse moving formula heating furnace is subjected to quenching and tempering, the Quench heating temperature difference is ± 10
DEG C, the tempering heating temperature difference is ± 5 DEG C；
B: seamless steel pipe surface is rinsed using the giant of furnace outlet position, the iron scale on surface is removed；
C: sizing carries out sizing processing to steel pipe on sizing mill, and sizing temperature is 590 DEG C；
D: cutting, seamless steel pipe after on laser cutting machine to sizing carry out cutting process；
S8: seamless steel pipe tubing is carried out basecoat paint using epoxy-phenol resin paint, is then toasted by spraying,
Continue to carry out finishing coat spraying using epoxy-phenol resin paint after priming paint toasts cooling completely, then be toasted；
S9: the seamless steel pipe that spraying terminates is put into continuous oven and carries out curing process by curing process, and solidification temperature is
220 DEG C, curing time 60min；
S10: finishing cuts off the seamless steel pipe that curing process is completed, tail, trimming, leveling and smooth processing respectively；
S11: it checks packaging, after seamless steel pipe finishing, checks the quality of seamless steel pipe, and packed；
The field trash of LF external refining is rated 0.05 grade by ASTM in the step S2；The quantity of slag is the 5% of amount of metal, institute
It states Step d white slag in step S2 and uses AL2O3-CaO-SiO2It is clinker, cinder inclusion basicity R>=3, w (FeO+MnO)<4% in slag, institute
The caliber margin of tolerance for stating hot rolling in step S5 is less than 0.01mm, and the baking temperature of basecoat paint is 135 DEG C in the step S8,
Baking time is 60min；The baking temperature of finishing coat spraying is 135 DEG C, baking time 60min.
Embodiment 3
The present invention provides a kind of petroleum manufacturing methods of high pressure resistant seamless steel pipe, comprising the following steps:
S1: seamless steel pipe raw material is put into electric arc furnaces and smelts by electric arc furnace smelting, and smelting temperature is 4000 DEG C, will
Raw material is smelted into melt feed；
S2:LF external refining, steps are as follows:
A: submerged arc heating, LF furnace use 3 root graphite electrodes, carry out submerged arc heating, terminal in electrode insertion slag blanket when heating
The accuracy of temperature≤± 5 DEG C；
B: argon gas stirring accelerates the substance between steel-slag to transmit, carries out deoxidation, desulfurization by steel ladle bottom argon blowing gas agitating
Reaction, and promotes the floating of field trash to remove, while accelerating the uniform of liquid steel temperature and ingredient, precisely adjust molten steel at
Point；
C: furnace reduction atmosphere, ladle and bell seal, and graphite electrode oxidation generates C0 gas, and also Primordial Qi is formd in furnace
Atmosphere, molten steel further deoxidation, desulfurization and removal non-metallic inclusion under the reducing conditions, and avoids nitrogen pick-up；
D: white slag refines, and the reducing slag of w (FeO)≤1% is borrowed by the reducing slag of high alkalinity in the white slag of LF furnace refining
Argon gas is helped to stir, diffusive deoxidation, desulfurization and removal non-metallic inclusion；
The molten steel after LF external refining is put into VD type ladle refining furnace in S3:VD vacuum outgas, is carried out to molten steel true
Alloying component fine tuning and argon gas stirring under empty degassing process and vacuum；
S4: the molten steel after VD Fruit storage is poured into mold and seamless steel tube blank material is made by pipe production；
S5: pipe is put on roll mill and carries out hot rolling by unit rolling, and rolling temperature is 1100 DEG C；
S6: expanding system, uses needs according to design, carries out expansion system to the seamless steel pipe rolled, and expanding temperature processed is 830 DEG C,
Thermal expansion speed is 60mm/min；
S7: heat treatment, steps are as follows:
A: seamless steel pipe feeding stepping transverse moving formula heating furnace is subjected to quenching and tempering, the Quench heating temperature difference is ± 10
DEG C, the tempering heating temperature difference is ± 5 DEG C；
B: seamless steel pipe surface is rinsed using the giant of furnace outlet position, the iron scale on surface is removed；
C: sizing carries out sizing processing to steel pipe on sizing mill, and sizing temperature is 680 DEG C；
D: cutting, seamless steel pipe after on laser cutting machine to sizing carry out cutting process；
S8: seamless steel pipe tubing is carried out basecoat paint using epoxy-phenol resin paint, is then toasted by spraying,
Continue to carry out finishing coat spraying using epoxy-phenol resin paint after priming paint toasts cooling completely, then be toasted；
S9: the seamless steel pipe that spraying terminates is put into continuous oven and carries out curing process by curing process, and solidification temperature is
240 DEG C, curing time 60min；
S10: finishing cuts off the seamless steel pipe that curing process is completed, tail, trimming, leveling and smooth processing respectively；
S11: it checks packaging, after seamless steel pipe finishing, checks the quality of seamless steel pipe, and packed；
The field trash of LF external refining is rated 0.1 grade by ASTM in the step S2；The quantity of slag is the 8% of amount of metal, institute
It states Step d white slag in step S2 and uses AL2O3-CaO-SiO2It is clinker, cinder inclusion basicity R>=3, w (FeO+MnO)<4% in slag, institute
The caliber margin of tolerance for stating hot rolling in step S5 is less than 0.01mm, and the baking temperature of basecoat paint is 150 DEG C in the step S8,
Baking time is 70min；The baking temperature of finishing coat spraying is 150 DEG C, baking time 70min.
A kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum provided by the invention, the technique ginseng of the seamless steel pipe of preparation
Number data see the table below 1:
| Seamless steel pipe of the present invention | Yield strength | Tensile strength | Resistance to pressure pressure | Service life increase rate |
| Parameter | Greater than 395MPa | Greater than 525MPa | More than 400bar | 3-5 times |
In summary: the manufacturing method of the high pressure resistant seamless steel pipe of the strict control of the present invention petroleum, material successively pass through
The processing modes such as electric arc furnace smelting, LF external refining, VD vacuum outgas, and the seamless steel pipe expanded after making is heat-treated, it makes
Standby seamless steel pipe yield strength is greater than 395MPa, and tensile strength is greater than 525MPa, and resistance to pressure pressure is more than 400bar, is passed through simultaneously
Petroleum after spray treatment is obviously improved with high pressure resistant seamless steel pipe corrosion resistance, and the service life of pipeline improves 3-5 times, together
The hydraulic efficiency of Shi Guanbi promotes 15-25%, and the seamless steel pipe of manufacture can be completely suitable for oil exploitation, is suitble to push away extensively
Extensively.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features,
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (5)
1. a kind of petroleum manufacturing method of high pressure resistant seamless steel pipe, it is characterised in that: the following steps are included:
S1: seamless steel pipe raw material is put into electric arc furnaces and smelts by electric arc furnace smelting, and smelting temperature is 3800-4000 DEG C, will
Raw material is smelted into melt feed；
S2:LF external refining, steps are as follows:
A: submerged arc heating, LF furnace use 3 root graphite electrodes, carry out submerged arc heating, outlet temperature in electrode insertion slag blanket when heating
Accuracy≤± 5 DEG C；
B: argon gas stirring accelerates the substance between steel-slag to transmit, carries out deoxidation, desulphurization reaction by steel ladle bottom argon blowing gas agitating,
And promote the floating of field trash to remove, while accelerating the uniform of liquid steel temperature and ingredient, precisely adjust the ingredient of molten steel；
C: furnace reduction atmosphere, ladle and bell seal, and graphite electrode oxidation generates C0 gas, form reducing atmosphere in furnace,
Molten steel further deoxidation, desulfurization and removal non-metallic inclusion under the reducing conditions, and avoid nitrogen pick-up；
D: white slag refines, the reducing slag of w (FeO)≤1% in the white slag of LF furnace refining, by the reducing slag of high alkalinity, by argon
Gas agitating, diffusive deoxidation, desulfurization and removal non-metallic inclusion；
The molten steel after LF external refining is put into VD type ladle refining furnace in S3:VD vacuum outgas, and it is de- to carry out vacuum to molten steel
Alloying component fine tuning and argon gas stirring under gas disposal and vacuum；
S4: the molten steel after VD Fruit storage is poured into mold and seamless steel tube blank material is made by pipe production；
S5: pipe is put on roll mill and carries out hot rolling by unit rolling, and rolling temperature is 700-1100 DEG C；
S6: expanding system, uses needs according to design, carries out expansion system to the seamless steel pipe rolled, and expanding temperature processed is 800-830 DEG C,
Thermal expansion speed is 50 ± 10mm/min；
S7: heat treatment, steps are as follows:
A: carrying out quenching and tempering for seamless steel pipe feeding stepping transverse moving formula heating furnace, and the Quench heating temperature difference is ± 10 DEG C,
The tempering heating temperature difference is ± 5 DEG C；
B: seamless steel pipe surface is rinsed using the giant of furnace outlet position, the iron scale on surface is removed；
C: sizing carries out sizing processing to steel pipe on sizing mill, and sizing temperature is 500-680 DEG C；
D: cutting, seamless steel pipe after on laser cutting machine to sizing carry out cutting process；
S8: seamless steel pipe tubing is carried out basecoat paint using epoxy-phenol resin paint, is then toasted, the bottom of to by spraying
Continue to carry out finishing coat spraying using epoxy-phenol resin paint after paint baking cooling completely, then be toasted；
S9: the seamless steel pipe that spraying terminates is put into continuous oven and carries out curing process by curing process, solidification temperature 200-
240 DEG C, curing time 60min；
S10: finishing cuts off the seamless steel pipe that curing process is completed, tail, trimming, leveling and smooth processing respectively；
S11: it checks packaging, after seamless steel pipe finishing, checks the quality of seamless steel pipe, and packed.
2. a kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum according to claim 1, it is characterised in that: the step
The field trash of LF external refining is rated 0-0.1 grades by ASTM in rapid S2；The quantity of slag is the 2~8% of amount of metal.
3. a kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum according to claim 1, it is characterised in that: the step
Step d white slag uses AL in rapid S22O3-CaO-SiO2It is clinker, cinder inclusion basicity R>=3, w (FeO+MnO)<4% in slag.
4. a kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum according to claim 1, it is characterised in that: the step
The caliber margin of tolerance of hot rolling is less than 0.01mm in rapid S5.
5. a kind of manufacturing method of the high pressure resistant seamless steel pipe of petroleum according to claim 1, it is characterised in that: the step
The baking temperature of basecoat paint is 120-150 DEG C in rapid S8, baking time 50-70min；Finishing coat spraying baking temperature be for
120-150 DEG C, baking time 50-70min.
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