CN104759888A - Manufacturing method of hot-rolled high-hardness petroleum pipe - Google Patents
Manufacturing method of hot-rolled high-hardness petroleum pipe Download PDFInfo
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- CN104759888A CN104759888A CN201410009532.1A CN201410009532A CN104759888A CN 104759888 A CN104759888 A CN 104759888A CN 201410009532 A CN201410009532 A CN 201410009532A CN 104759888 A CN104759888 A CN 104759888A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/02—Rigid pipes of metal
Abstract
The invention relates to a manufacturing method of a hot-rolled high-hardness petroleum pipe. The manufacturing method comprises the following steps: heating: a pipe blank is heated in an annular furnace; perforation: the heated pipe blank is perforated by a perforator; annealing: the pipe blank is annealed; spraying of boron sand: scales are removed; hot rolling: the annealed pipe blank is leaded into a pipe rolling machine for hot rolling; pipe release: the rolled pipe is released from a core rod; stress relieving: the rolled pipe is leaded into a heating furnace for heating to obtain the annealed pipe blank; acid washing: the scales on the surface are removed; parkerizing: a chemical coating film of zinc phosphate is formed on the surface; saponification: such lubricating coating films as a metallic soap are formed; cold rolling: the pipe blank to be cold rolled is cold tolled to obtain a cold-rolled pipe; heat treatment: residual stress is reduced; pre-straightening: the residual stress is reduced; quenching in an induction furnace; tempering in a chamber furnace; honing; hot straightening; and obtaining of high-precision steel pipe. The method obtains the hot-rolled high-hardness petroleum pipe with high hardness and precise size.
Description
Technical field
The invention belongs to steel pipe preparing technical field, be specifically related to a kind of manufacture method of hot rolling high rigidity petroleum pipeline.
Background technology
As the cold process of the steel for mechanical structure pipes such as carbon steel, alloy steel or stainless steel, there are known the drawing processing method of being undertaken by drawbench and the rolling processing method of being undertaken by Pierre's form milling train.Wherein, the drawing processing method of being undertaken by drawbench, compared with the rolling processing method of carrying out with machine of being pricked by Pierre's form, cold working steel pipe can be manufactured expeditiously, this seamless steel pipe is used for oil hydraulic cylinder, pneumatic cylinder uses, and at present, most Hi-grade steel its yield strength, dimensional discrepancy etc. of domestic current prescribed by standard all cannot meet the instructions for use of actual oil hydraulic cylinder, pneumatic cylinder, make the oil hydraulic cylinder of China, pneumatic cylinder seamless steel pipe can only dependence on import, constrain the development of China's cold tube rolling.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of manufacture method of hot rolling high rigidity petroleum pipeline is provided, the cold rolling high rigidity seamless steel pipe that the method obtains, improve the wearability on surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, oil cylinder service life, improve 2 ~ 3 times, yield strength is high, tensile strength is high, precision size, smooth surface, its store oil excellent performance, make running more smooth and easy, without stall condition, expanded service life, be applicable to oil hydraulic cylinder, pneumatic cylinder, fork truck, crane, stacker, building machinery, the various laborsaving automated machine engineering such as punch press.
According to technical scheme provided by the invention, a kind of manufacture method of hot rolling high rigidity petroleum pipeline comprises the steps:
(1), heating: 27SiMn pipe is heated to 1200 ~ 1350 DEG C in annular furnace, and the heat time is 4 ~ 5 hours, thus ensures that heating of pipe blank is even;
(2), bore a hole: heat pipe base perforated machine is bored a hole, the temperature of the hollow billet formed after perforation controls at 1150 ~ 1250 DEG C, and order control punch eccentricity and control pipe surface quality;
(3), annealing: introduced in continuous annealing furnace by pipe and anneal, and order control annealing temperature is 600 ~ 700 DEG C, annealing time is 70 ~ 80min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 218;
(4), borax is sprayed: spray borax device blows to the descaling of hollow billet endoporus nitrogen and borax through spiral nozzle and fill nitrogen in hollow billet, its main function is removed by the residual oxidization skin in hollow billet, form a skim at the inner surface of hollow billet simultaneously, prevent hollow billet to be further oxidized;
(5), hot rolling: pipe of annealing introduces pipe mill hot rolling, and hot-rolled temperature is 1250 ~ 1260 DEG C, obtains rolled pipe;
(6), de-pipe: rolled pipe and plug are thrown off, to subsequent processing, guarantees that the reducing rate of rolled pipe in de-plumber's sequence is between 0 ~ 2%;
(7), stress relief annealing: rolled pipe introduced heating in heating furnace and be incubated, come out of the stove with after stove cooling, obtain pipe of annealing, object is the intensity guaranteeing steel pipe, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 550 ~ 750 DEG C, can obtain the effect of work hardening, in order to remove the strength variance of cold tube rolling, in the stove of cold tube rolling, the retention time is 10 ~ 30 minutes;
(8), pickling processes: annealing pipe is carried out pickling, removes the scale on surface, concentration of hydrochloric acid: 7 ~ 19%, pickling time: 35 ~ 60 minutes, then neutralization pond rolling, rolling number of times: 2 ~ 3 times, neutralizer pH value: 9 ~ 10, then through clear water reserviors rolling, rolling number of times: 2 ~ 3 times;
(9), phosphorating treatment: the chemistry forming trbasic zinc phosphate on the surface of pipe generates overlay film, trbasic zinc phosphate concentration: 20 ~ 30%, Phosphating Solution temperature: 68 ~ 75 DEG C, phosphating time: 10 ~ 20 minutes, Phosphating Solution free acidity: 4 ~ 7, General Acidity in Phosphating Solution: 45 ~ 75;
(10), saponification process: form the lubricating film coateds such as metallic soap on overlay film, saponification temperature: 55 ~ 75 DEG C, saponification time: 8 ~ 15 minutes, saponification liquor pH value: 8 ~ 9;
(11), cold rolling: will treat that cold rolling pipe carries out cold rolling processing, and obtain cold rolled tube, the reciprocal time of the headstock of pipe mill is 20 ~ 40 times/min, and the length of at every turn sending to of pipe is 8 ~ 10mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 800 ~ 850 DEG C, and hardening media is water, and temperature, at 550 ~ 580 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 650 ~ 700 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 850 ~ 880 DEG C, and hardening media is water, reduces the residual stress of drawn tube;
(15), temper in batch-type furnace: the temperature of tempering air cooling is 400 ~ 500 DEG C, to reduce residual stress;
(16), honing: select numerical control honing machine, workpiece turns round, and the form processing that honing head is reciprocating, reaches cylindricity: 0.01 ~ 0.02mm, Aperture deviation: 0.01 ~ 0.02mm, roughness: the high standard precision of Ra0.25 ~ 0.35;
(17), thermal straightening process: be incubated 45 ~ 60 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 550 ~ 650 DEG C, obtain yield strength (MPa): 895, tensile strength (MPa): 916, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high rigidity seamless steel pipe of linearity: 0.30mm/m.
Beneficial effect of the present invention is as follows: the hot rolling high rigidity petroleum pipeline utilizing the inventive method to produce, improve the wearability on surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, oil cylinder service life, improve 2 ~ 3 times, yield strength is high, tensile strength is high, precision size, smooth surface, its store oil excellent performance, make running more smooth and easy, without stall condition, expanded service life, be applicable to oil hydraulic cylinder, pneumatic cylinder, fork truck, crane, stacker, building machinery, the various laborsaving automated machine engineering such as punch press.
Detailed description of the invention:
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one:
To prepare diameter for 149.3mm and the hole wall wall thickness 27SiMn steel pipe that is 8.43mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1200 DEG C in annular furnace, and the heat time is 4 hours, thus ensures that heating of pipe blank is even;
(2), bore a hole: heat pipe base perforated machine is bored a hole, the temperature of the hollow billet formed after perforation controls at 1150 DEG C, and order control punch eccentricity is 4%, visualize is carried out to pipe, use remove pipe surface burr, stick up skin, if pipe surface occurs or there is pit that significantly namely naked eyes are obvious, runs over and injure and crackle, then should reject, avoid flowing into subsequent processing, to control pipe surface quality;
(3), annealing: introduced in continuous annealing furnace by pipe and anneal, and order control annealing temperature is 600 DEG C, annealing time is 70min, obtains the annealing pipe that annealing hardness (HV) is 210;
(4), borax is sprayed: spray borax device blows to the descaling of hollow billet endoporus nitrogen and borax through spiral nozzle and fill nitrogen in hollow billet, its main function is removed by the residual oxidization skin in hollow billet, form a skim at the inner surface of hollow billet simultaneously, prevent hollow billet to be further oxidized;
(5), hot rolling: pipe of annealing introduces pipe mill hot rolling, and hot-rolled temperature is 1250 DEG C, obtains rolled pipe;
(6), de-pipe: rolled pipe and plug are thrown off, to subsequent processing, guarantees that the reducing rate of rolled pipe in de-plumber's sequence is 0;
(7), stress relief annealing: rolled pipe introduced heating in heating furnace and be incubated, come out of the stove with after stove cooling, obtain pipe of annealing, object is the intensity guaranteeing steel pipe, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 550 DEG C, can obtain the effect of work hardening, in order to remove the strength variance of cold tube rolling, in the stove of cold tube rolling, the retention time is 10 minutes;
(8), pickling processes: annealing pipe is carried out pickling, removes the scale on surface, concentration of hydrochloric acid: 7%, pickling time: 35 minutes, then neutralization pond rolls, rolling number of times: 2 times, neutralizer pH value: 9, then roll through clear water reserviors, rolling number of times: 2 times;
(9), phosphorating treatment: the chemistry forming trbasic zinc phosphate on the surface of pipe generates overlay film, trbasic zinc phosphate concentration: 20%, Phosphating Solution temperature: 68 DEG C, phosphating time: 10 minutes, Phosphating Solution free acidity: 4, General Acidity in Phosphating Solution: 45;
(10), saponification process: form the lubricating film coateds such as metallic soap on overlay film, saponification temperature: 55 DEG C, saponification time: 8 minutes, saponification liquor pH value: 8;
(11), cold rolling: will treat that cold rolling pipe carries out cold rolling processing, and obtain cold rolled tube, the reciprocal time of the headstock of pipe mill is 20 times/min, and the length of at every turn sending to of pipe is 8mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 800 DEG C, and hardening media is water, and temperature, at 550 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 650 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 850 DEG C, and hardening media is water, reduces the residual stress of drawn tube;
(15), temper in batch-type furnace: the temperature of tempering air cooling is 400 DEG C, to reduce residual stress;
(16), honing: select numerical control honing machine, workpiece turns round, and the form processing that honing head is reciprocating, reaches cylindricity: 0.01mm, Aperture deviation: 0.01mm, roughness: the high standard precision of Ra0.25;
(17), thermal straightening process: be incubated 45 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 550 DEG C, obtain yield strength (MPa): 895, tensile strength (MPa): 916, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high rigidity seamless steel pipe of linearity: 0.30mm/m.
After testing, institute's inspection project meets GB/T3639-2009 standard to the product that the present embodiment obtains, and product is qualified, meets the requirement of user to yield strength, tensile strength, hardness.
The contrast in technical performance of a kind of hot rolling high rigidity petroleum pipeline and conventional steel pipe
Embodiment two:
To prepare diameter for 131.9mm and the hole wall wall thickness 27SiMn steel pipe that is 8.9mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1350 DEG C in annular furnace, and the heat time is 5 hours, thus ensures that heating of pipe blank is even;
(2), bore a hole: heat pipe base perforated machine is bored a hole, the temperature of the hollow billet formed after perforation controls at 1250 DEG C, and order control punch eccentricity is 4%, visualize is carried out to pipe, use remove pipe surface burr, stick up skin, if pipe surface occurs or there is pit that significantly namely naked eyes are obvious, runs over and injure and crackle, then should reject, avoid flowing into subsequent processing, to control pipe surface quality;
(3), annealing: introduced in continuous annealing furnace by pipe and anneal, and order control annealing temperature is 700 DEG C, annealing time is 80min, obtains the annealing pipe that annealing hardness (HV) is 218;
(4), borax is sprayed: spray borax device blows to the descaling of hollow billet endoporus nitrogen and borax through spiral nozzle and fill nitrogen in hollow billet, its main function is removed by the residual oxidization skin in hollow billet, form a skim at the inner surface of hollow billet simultaneously, prevent hollow billet to be further oxidized;
(5), hot rolling: pipe of annealing introduces pipe mill hot rolling, and hot-rolled temperature is 1260 DEG C, obtains rolled pipe;
(6), de-pipe: rolled pipe and plug are thrown off, to subsequent processing, guarantees that the reducing rate of rolled pipe in de-plumber's sequence is 2%;
(7), stress relief annealing: rolled pipe introduced heating in heating furnace and be incubated, come out of the stove with after stove cooling, obtain pipe of annealing, object is the intensity guaranteeing steel pipe, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 750 DEG C, can obtain the effect of work hardening, in order to remove the strength variance of cold tube rolling, in the stove of cold tube rolling, the retention time is 30 minutes;
(8), pickling processes: annealing pipe is carried out pickling, removes the scale on surface, concentration of hydrochloric acid: 19%, pickling time: 60 minutes, then neutralization pond rolls, rolling number of times: 3 times, neutralizer pH value: 10, then roll through clear water reserviors, rolling number of times: 3 times;
(9), phosphorating treatment: the chemistry forming trbasic zinc phosphate on the surface of pipe generates overlay film, trbasic zinc phosphate concentration: 30%, Phosphating Solution temperature: 75 DEG C, phosphating time: 20 minutes, Phosphating Solution free acidity: 7, General Acidity in Phosphating Solution: 75;
(10), saponification process: form the lubricating film coateds such as metallic soap on overlay film, saponification temperature: 75 DEG C, saponification time: 15 minutes, saponification liquor pH value: 9;
(11), cold rolling: will treat that cold rolling pipe carries out cold rolling processing, and obtain cold rolled tube, the reciprocal time of the headstock of pipe mill is 40 times/min, and the length of at every turn sending to of pipe is 10mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 850 DEG C, and hardening media is water, and temperature, at 580 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 700 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 880 DEG C, and hardening media is water, reduces the residual stress of drawn tube;
(15), temper in batch-type furnace: the temperature of tempering air cooling is 500 DEG C, to reduce residual stress;
(16), honing: select numerical control honing machine, workpiece turns round, and the form processing that honing head is reciprocating, reaches cylindricity: 0.02mm, Aperture deviation: 0.02mm, roughness: the high standard precision of Ra0.35;
(17), thermal straightening process: be incubated 60 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 650 DEG C, obtain yield strength (MPa): 891, tensile strength (MPa): 918, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high rigidity seamless steel pipe of linearity: 0.30mm/m.
Embodiment three:
To prepare diameter for 142.4mm and the hole wall wall thickness 27SiMn steel pipe that is 8.32mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1300 DEG C in annular furnace, and the heat time is 4.5 hours, thus ensures that heating of pipe blank is even;
(2), bore a hole: heat pipe base perforated machine is bored a hole, the temperature of the hollow billet formed after perforation controls at 1200 DEG C, and order control punch eccentricity is 4%, visualize is carried out to pipe, use remove pipe surface burr, stick up skin, if pipe surface occurs or there is pit that significantly namely naked eyes are obvious, runs over and injure and crackle, then should reject, avoid flowing into subsequent processing, to control pipe surface quality;
(3), annealing: introduced in continuous annealing furnace by pipe and anneal, and order control annealing temperature is 650 DEG C, annealing time is 75min, obtains the annealing pipe that annealing hardness (HV) is 215;
(4), borax is sprayed: spray borax device blows to the descaling of hollow billet endoporus nitrogen and borax through spiral nozzle and fill nitrogen in hollow billet, its main function is removed by the residual oxidization skin in hollow billet, form a skim at the inner surface of hollow billet simultaneously, prevent hollow billet to be further oxidized;
(5), hot rolling: pipe of annealing introduces pipe mill hot rolling, and hot-rolled temperature is 1255 DEG C, obtains rolled pipe;
(6), de-pipe: rolled pipe and plug are thrown off, to subsequent processing, guarantees that the reducing rate of rolled pipe in de-plumber's sequence is 1%;
(7), stress relief annealing: rolled pipe introduced heating in heating furnace and be incubated, come out of the stove with after stove cooling, obtain pipe of annealing, object is the intensity guaranteeing steel pipe, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 700 DEG C, can obtain the effect of work hardening, in order to remove the strength variance of cold tube rolling, in the stove of cold tube rolling, the retention time is 20 minutes;
(8), pickling processes: annealing pipe is carried out pickling, removes the scale on surface, concentration of hydrochloric acid: 13%, pickling time: 45 minutes, then neutralization pond rolling, rolling number of times: 2.5 times, neutralizer pH value: 9.5, then through clear water reserviors rolling, rolling number of times: 2.5 times;
(9), phosphorating treatment: the chemistry forming trbasic zinc phosphate on the surface of pipe generates overlay film, trbasic zinc phosphate concentration: 25%, Phosphating Solution temperature: 70 DEG C, phosphating time: 15 minutes, Phosphating Solution free acidity: 6, General Acidity in Phosphating Solution: 55;
(10), saponification process: form the lubricating film coateds such as metallic soap on overlay film, saponification temperature: 65 DEG C, saponification time: 10 minutes, saponification liquor pH value: 8.5;
(11), cold rolling: will treat that cold rolling pipe carries out cold rolling processing, and obtain cold rolled tube, the reciprocal time of the headstock of pipe mill is 30 times/min, and the length of at every turn sending to of pipe is 9mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 820 DEG C, and hardening media is water, and temperature, at 570 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 680 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 860 DEG C, and hardening media is water, reduces the residual stress of drawn tube;
(15), temper in batch-type furnace: the temperature of tempering air cooling is 450 DEG C, to reduce residual stress;
(16), honing: select numerical control honing machine, workpiece turns round, and the form processing that honing head is reciprocating, reaches cylindricity: 0.015mm, Aperture deviation: 0.015mm, roughness: the high standard precision of Ra0.31;
(17), thermal straightening process: be incubated 55 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 600 DEG C, obtain yield strength (MPa): 899, tensile strength (MPa): 926, hardness (HV): 255, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high rigidity seamless steel pipe of linearity: 0.30mm/m.
Claims (1)
1. the manufacture method of a hot rolling high rigidity petroleum pipeline comprises the steps:
(1), heating: 27SiMn pipe is heated to 1200 ~ 1350 DEG C in annular furnace, and the heat time is 4 ~ 5 hours, thus ensures that heating of pipe blank is even;
(2), bore a hole: heat pipe base perforated machine is bored a hole, the temperature of the hollow billet formed after perforation controls at 1150 ~ 1250 DEG C, and order control punch eccentricity and control pipe surface quality;
(3), annealing: introduced in continuous annealing furnace by pipe and anneal, and order control annealing temperature is 600 ~ 700 DEG C, annealing time is 70 ~ 80min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 218;
(4), borax is sprayed: spray borax device blows to the descaling of hollow billet endoporus nitrogen and borax through spiral nozzle and fill nitrogen in hollow billet, its main function is removed by the residual oxidization skin in hollow billet, form a skim at the inner surface of hollow billet simultaneously, prevent hollow billet to be further oxidized;
(5), hot rolling: pipe of annealing introduces pipe mill hot rolling, and hot-rolled temperature is 1250 ~ 1260 DEG C, obtains rolled pipe;
(6), de-pipe: rolled pipe and plug are thrown off, to subsequent processing, guarantees that the reducing rate of rolled pipe in de-plumber's sequence is between 0 ~ 2%;
(7), stress relief annealing: rolled pipe introduced heating in heating furnace and be incubated, come out of the stove with after stove cooling, obtain pipe of annealing, object is the intensity guaranteeing steel pipe, when annealing temperature is too high, processing strain recovers, can not obtain the effect of work hardening, annealing temperature is 550 ~ 750 DEG C, can obtain the effect of work hardening, in order to remove the strength variance of cold tube rolling, in the stove of cold tube rolling, the retention time is 10 ~ 30 minutes;
(8), pickling processes: annealing pipe is carried out pickling, removes the scale on surface, concentration of hydrochloric acid: 7 ~ 19%, pickling time: 35 ~ 60 minutes, then neutralization pond rolling, rolling number of times: 2 ~ 3 times, neutralizer pH value: 9 ~ 10, then through clear water reserviors rolling, rolling number of times: 2 ~ 3 times;
(9), phosphorating treatment: the chemistry forming trbasic zinc phosphate on the surface of pipe generates overlay film, trbasic zinc phosphate concentration: 20 ~ 30%, Phosphating Solution temperature: 68 ~ 75 DEG C, phosphating time: 10 ~ 20 minutes, Phosphating Solution free acidity: 4 ~ 7, General Acidity in Phosphating Solution: 45 ~ 75;
(10), saponification process: form the lubricating film coateds such as metallic soap on overlay film, saponification temperature: 55 ~ 75 DEG C, saponification time: 8 ~ 15 minutes, saponification liquor pH value: 8 ~ 9;
(11), cold rolling: will treat that cold rolling pipe carries out cold rolling processing, and obtain cold rolled tube, the reciprocal time of the headstock of pipe mill is 20 ~ 40 times/min, and the length of at every turn sending to of pipe is 8 ~ 10mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 800 ~ 850 DEG C, and hardening media is water, and temperature, at 550 ~ 580 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 650 ~ 700 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 850 ~ 880 DEG C, and hardening media is water, reduces the residual stress of drawn tube;
(15), temper in batch-type furnace: the temperature of tempering air cooling is 400 ~ 500 DEG C, to reduce residual stress;
(16), honing: select numerical control honing machine, workpiece turns round, and the form processing that honing head is reciprocating, reaches cylindricity: 0.01 ~ 0.02mm, Aperture deviation: 0.01 ~ 0.02mm, roughness: the high standard precision of Ra0.25 ~ 0.35;
(17), thermal straightening process: be incubated 45 ~ 60 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 550 ~ 650 DEG C, obtain yield strength (MPa): 895, tensile strength (MPa): 916, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the hot rolling high rigidity petroleum pipeline of linearity: 0.30mm/m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410009532.1A CN104759888A (en) | 2014-01-02 | 2014-01-02 | Manufacturing method of hot-rolled high-hardness petroleum pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562852A (en) * | 2016-01-13 | 2016-05-11 | 成都优拓优联科技有限公司 | Processing process for inner barrel for petroleum drilling |
| CN110527808A (en) * | 2019-08-26 | 2019-12-03 | 武汉科技大学 | The low temperature residual stress of hot-rolled high-strength strip regulates and controls method |
| CN113245856A (en) * | 2021-05-06 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of U-shaped heat exchange tube |
-
2014
- 2014-01-02 CN CN201410009532.1A patent/CN104759888A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105562852A (en) * | 2016-01-13 | 2016-05-11 | 成都优拓优联科技有限公司 | Processing process for inner barrel for petroleum drilling |
| CN110527808A (en) * | 2019-08-26 | 2019-12-03 | 武汉科技大学 | The low temperature residual stress of hot-rolled high-strength strip regulates and controls method |
| CN110527808B (en) * | 2019-08-26 | 2021-05-18 | 武汉科技大学 | Low-temperature residual stress regulation and control method for hot-rolled high-strength strip steel |
| CN113245856A (en) * | 2021-05-06 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of U-shaped heat exchange tube |
| CN113245856B (en) * | 2021-05-06 | 2023-03-14 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of U-shaped heat exchange tube |
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