CN104759832A - Manufacturing method of hot-rolled high-collapse-resistance petroleum pipe - Google Patents
Manufacturing method of hot-rolled high-collapse-resistance petroleum pipe Download PDFInfo
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- CN104759832A CN104759832A CN201410009505.4A CN201410009505A CN104759832A CN 104759832 A CN104759832 A CN 104759832A CN 201410009505 A CN201410009505 A CN 201410009505A CN 104759832 A CN104759832 A CN 104759832A
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- 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
- B21C37/10—Making tubes with riveted seams or with non-welded and non-soldered seams
- B21C37/107—Tube treating or manipulating combined with or specially adapted for use in connection with tube-making machines, e.g. drawing-off devices, cutting-off
Abstract
The invention relates to a manufacturing method of a hot-rolled high-collapse-resistance petroleum pipe. The manufacturing method comprises the following steps of: 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: oxide scales are removed; hot rolling: the annealed pipe blank is led into a pipe rolling machine for hot rolling; sizing: the rolled pipe formed by continuous rolling is sized by a sizing machine; stress relief annealing: the rolled pipe is led into a heating furnace for heating so that the annealed pipe blank is obtained; acid washing: rust 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 drawing: the pipe blank to be cold drawn is cold drawn to obtain a cold-drawn pipe; normalization air cooling; straightening; quenching in an induction furnace; tempering in a chamber furnace; and finish boring and rolling: a cold-drawn finish-bored rolling pipe is obtained. The finish-bored rolling pipe obtained from the method has the advantages of good comprehensive performance, good low-temperature impact toughness, precise size, smooth surface and excellent oil storage performance.
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 anti-extrusion petroleum pipe.
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 anti-extrusion petroleum pipe is provided, the finish-boring rolling 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, roll extrusion efficiency comparatively grinding efficiency improves 15 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 anti-extrusion petroleum pipe comprises the steps:
(1), heating: 27SiMn pipe is heated to 1300 ~ 1320 DEG C in annular furnace, and the heat time is 3 ~ 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 ~ 1280 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 700 ~ 720 DEG C, annealing time is 50 ~ 60min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 220;
(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 1220 ~ 1250 DEG C, obtains rolled pipe;
(6), sizing: the rolled pipe formed after tandem rolling is again through sizing mill sizing, and form steel pipe, finishing temperature control during sizing is at 880 ~ 890 DEG C;
(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 610 ~ 650 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 60 ~ 70 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-drawn: will treat that cold-drawn pipe carries out cold-drawn processing, and obtain drawn tube, cold-drawing technology, mould chock plug and bore spacing: 3 ~ 5mm, pull out machine draft: 350 ~ 450t, and saponification pipe pulls out the front storage period: 72 ~ 96h;
(12), normalizing air cooling process: the temperature of normalizing air cooling is 450 ~ 480 DEG C, prevents steel tube surface from occurring pockmark, carries out surface treatment;
(13), straightening processing: straightening temperature 350 ~ 380 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 750 ~ 800 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 300 ~ 400 DEG C, to reduce residual stress;
(16), finish-boring rolling: pass through roll forming, rolling surface forms one deck flow harden layer, decrease elasticity and the plastic deformation of the secondary contact surface of grinding, thus improve the wearability on polished rod surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, obtain yield strength (MPa): 820, tensile strength (MPa): 880, outer diameter tolerance :+0.4, wall thickness tolerance: 7, external diameter out-of-roundness: 0.2, eccentricity: 5, linearity (mm/m): a kind of hot rolling high anti-extrusion petroleum pipe of 0.20.
Beneficial effect of the present invention is as follows: the hot rolling high anti-extrusion petroleum pipe 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, roll extrusion efficiency comparatively grinding efficiency improves 15 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 135.3mm and the hole wall wall thickness 27SiMn steel pipe that is 7.23mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1300 DEG C in annular furnace, and the heat time is 3 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 50min, 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 1220 DEG C, obtains rolled pipe;
(6), sizing: the rolled pipe formed after tandem rolling is again through sizing mill sizing, and form steel pipe, finishing temperature control during sizing is at 880 DEG C;
(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 610 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 60 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-drawn: will treat that cold-drawn pipe carries out cold-drawn processing, and obtain drawn tube, cold-drawing technology, mould chock plug and bore spacing: 3mm, pull out machine draft: 550t, and saponification pipe pulls out the front storage period: 72h;
(12), normalizing air cooling process: the temperature of normalizing air cooling is 450 DEG C, prevents steel tube surface from occurring pockmark, carries out surface treatment;
(13), straightening processing: straightening temperature 350 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 750 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 300 DEG C, to reduce residual stress;
(16), finish-boring rolling: pass through roll forming, rolling surface forms one deck flow harden layer, decrease elasticity and the plastic deformation of the secondary contact surface of grinding, thus improve the wearability on polished rod surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, obtain yield strength (MPa): 820, tensile strength (MPa): 880, outer diameter tolerance :+0.4, wall thickness tolerance: 7, external diameter out-of-roundness: 0.2, eccentricity: 5, linearity (mm/m): the cold-drawn finish-boring rolling pipe of 0.20.
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 anti-extrusion petroleum pipe and conventional steel pipe
Embodiment two:
To prepare diameter for 132.9mm and the hole wall wall thickness 27SiMn steel pipe that is 7.29mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1320 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 1280 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 720 DEG C, annealing time is 60min, obtains the annealing pipe that annealing hardness (HV) is 220;
(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), sizing: the rolled pipe formed after tandem rolling is again through sizing mill sizing, and form steel pipe, finishing temperature control during sizing is at 890 DEG C;
(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 650 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 70 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-drawn: will treat that cold-drawn pipe carries out cold-drawn processing, and obtain drawn tube, cold-drawing technology, mould chock plug and bore spacing: 5mm, pull out machine draft: 450t, and saponification pipe pulls out the front storage period: 96h;
(12), normalizing air cooling process: the temperature of normalizing air cooling is 480 DEG C, prevents steel tube surface from occurring pockmark, carries out surface treatment;
(13), straightening processing: straightening temperature 380 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 800 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), finish-boring rolling: pass through roll forming, rolling surface forms one deck flow harden layer, decrease elasticity and the plastic deformation of the secondary contact surface of grinding, thus improve the wearability on polished rod surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, obtain yield strength (MPa): 830, tensile strength (MPa): 885, outer diameter tolerance :+0.4, wall thickness tolerance: 7, external diameter out-of-roundness: 0.2, eccentricity: 5, linearity (mm/m): the cold-drawn finish-boring rolling pipe of 0.20.
Embodiment three:
To prepare diameter for 157.4mm and the hole wall wall thickness 27SiMn steel pipe that is 7.92mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1310 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 1260 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 710 DEG C, annealing time is 55min, 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 1240 DEG C, obtains rolled pipe;
(6), sizing: the rolled pipe formed after tandem rolling is again through sizing mill sizing, and form steel pipe, finishing temperature control during sizing is at 885 DEG C;
(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 630 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 65 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-drawn: will treat that cold-drawn pipe carries out cold-drawn processing, and obtain drawn tube, cold-drawing technology, mould chock plug and bore spacing: 4mm, pull out machine draft: 400t, and saponification pipe pulls out the front storage period: 84h;
(12), normalizing air cooling process: the temperature of normalizing air cooling is 460 DEG C, prevents steel tube surface from occurring pockmark, carries out surface treatment;
(13), straightening processing: straightening temperature 370 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 780 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 350 DEG C, to reduce residual stress;
(16), finish-boring rolling: pass through roll forming, rolling surface forms one deck flow harden layer, decrease elasticity and the plastic deformation of the secondary contact surface of grinding, thus improve the wearability on polished rod surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, obtain yield strength (MPa): 835, tensile strength (MPa): 883, outer diameter tolerance :+0.4, wall thickness tolerance: 7, external diameter out-of-roundness: 0.2, eccentricity: 5, linearity (mm/m): the hot rolling high anti-extrusion petroleum pipe of 0.20.
Claims (1)
1. the manufacture method of a hot rolling high anti-extrusion petroleum pipe comprises the steps:
(1), heating: 27SiMn pipe is heated to 1300 ~ 1320 DEG C in annular furnace, and the heat time is 3 ~ 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 ~ 1280 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 700 ~ 720 DEG C, annealing time is 50 ~ 60min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 220;
(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 1220 ~ 1250 DEG C, obtains rolled pipe;
(6), sizing: the rolled pipe formed after tandem rolling is again through sizing mill sizing, and form steel pipe, finishing temperature control during sizing is at 880 ~ 890 DEG C;
(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 610 ~ 650 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 60 ~ 70 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-drawn: will treat that cold-drawn pipe carries out cold-drawn processing, and obtain drawn tube, cold-drawing technology, mould chock plug and bore spacing: 3 ~ 5mm, pull out machine draft: 350 ~ 450t, and saponification pipe pulls out the front storage period: 72 ~ 96h;
(12), normalizing air cooling process: the temperature of normalizing air cooling is 450 ~ 480 DEG C, prevents steel tube surface from occurring pockmark, carries out surface treatment;
(13), straightening processing: straightening temperature 350 ~ 380 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 750 ~ 800 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 300 ~ 400 DEG C, to reduce residual stress;
(16), finish-boring rolling: pass through roll forming, rolling surface forms one deck flow harden layer, decrease elasticity and the plastic deformation of the secondary contact surface of grinding, thus improve the wearability on polished rod surface, case hardness and intensity improve, improve the wearability of surface of the work, corrosion resistance and conformability, obtain yield strength (MPa): 820, tensile strength (MPa): 880, outer diameter tolerance :+0.4, wall thickness tolerance: 7, external diameter out-of-roundness: 0.2, eccentricity: 5, linearity (mm/m): the hot rolling high anti-extrusion petroleum pipe of 0.20.
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| CN201410009505.4A CN104759832A (en) | 2014-01-02 | 2014-01-02 | Manufacturing method of hot-rolled high-collapse-resistance petroleum pipe |
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| CN201410009505.4A CN104759832A (en) | 2014-01-02 | 2014-01-02 | Manufacturing method of hot-rolled high-collapse-resistance petroleum pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108588354A (en) * | 2018-08-13 | 2018-09-28 | 林州凤宝管业有限公司 | A kind of heat treatment process of steel level oil bushing |
| CN109174964A (en) * | 2018-08-01 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of control method of steel for welded structures plate surface piebald |
| CN113182780A (en) * | 2021-04-29 | 2021-07-30 | 徐州徐工液压件有限公司 | Method for machining inner hole with high efficiency and high quality of cold drawn pipe with super-large cylinder diameter |
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2014
- 2014-01-02 CN CN201410009505.4A patent/CN104759832A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109174964A (en) * | 2018-08-01 | 2019-01-11 | 南京钢铁股份有限公司 | A kind of control method of steel for welded structures plate surface piebald |
| CN108588354A (en) * | 2018-08-13 | 2018-09-28 | 林州凤宝管业有限公司 | A kind of heat treatment process of steel level oil bushing |
| CN113182780A (en) * | 2021-04-29 | 2021-07-30 | 徐州徐工液压件有限公司 | Method for machining inner hole with high efficiency and high quality of cold drawn pipe with super-large cylinder diameter |
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