CN104551669A - Production method of cold-drawn high-precision seamless steel tube - Google Patents
Production method of cold-drawn high-precision seamless steel tube Download PDFInfo
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- CN104551669A CN104551669A CN201310500843.3A CN201310500843A CN104551669A CN 104551669 A CN104551669 A CN 104551669A CN 201310500843 A CN201310500843 A CN 201310500843A CN 104551669 A CN104551669 A CN 104551669A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 61
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000007127 saponification reaction Methods 0.000 claims abstract description 21
- 238000004513 sizing Methods 0.000 claims abstract description 21
- 229910021538 borax Inorganic materials 0.000 claims abstract description 16
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 16
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 11
- 230000000171 quenching effect Effects 0.000 claims abstract description 11
- 238000005496 tempering Methods 0.000 claims abstract description 11
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims abstract description 11
- 229910000165 zinc phosphate Inorganic materials 0.000 claims abstract description 11
- 230000001050 lubricating effect Effects 0.000 claims abstract description 6
- 239000000344 soap Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 34
- 238000005097 cold rolling Methods 0.000 claims description 30
- 238000005096 rolling process Methods 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000005554 pickling Methods 0.000 claims description 15
- 239000004328 sodium tetraborate Substances 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000005482 strain hardening Methods 0.000 claims description 11
- 238000009785 tube rolling Methods 0.000 claims description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000003801 milling Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract 2
- 239000002253 acid Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000010622 cold drawing Methods 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000004080 punching Methods 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- BSVBQGMMJUBVOD-UHFFFAOYSA-N trisodium borate Chemical compound [Na+].[Na+].[Na+].[O-]B([O-])[O-] BSVBQGMMJUBVOD-UHFFFAOYSA-N 0.000 abstract 1
- 210000003128 head Anatomy 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
- B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
- B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
-
- 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
Abstract
The invention relates to a production method of a cold-drawn high-precision seamless steel tube. The production method includes heating a tube blank in a circular furnace; punching a heat tube by the aid of a puncher; subjecting the tube blank to annealing; spraying the tube blank with sodium borate to remove oxide skin; leading the annealed tube blank into a tube mill for hot milling; tensioning the milled tube after tandem milling by a tensioning machine for sizing; performing stress relieving, to be specific, heating the milled tube in a heating furnace to obtain an annealed tube blank; performing acid dipping on the tube blank to remove scale of the surface; subjecting the tube blank to parkerizing, and accordingly a chemical coating of zinc phosphate is generated on the surface of the tube blank; performing saponification to form lubricating coatings such as metallic soap; subjecting the tube blank to be cold drawn to cold drawing, and the cold-drawn tube is achieved; heating the cold-drawn tube to decrease residual stress; pre-straightening the cold-drawn tube to further decrease the residual stress; quenching the cold-drawn tube in an induction furnace; tempering the cold-drawn tube in a box-type furnace; honing the cold-drawn tube; subjecting the cold-drawn tube to heat straightening. In this way, the high-precision steel tube is obtained and high in yield strength and precise in size.
Description
Technical field
The invention belongs to steel pipe preparing technical field, be specifically related to a kind of manufacture method of cold rolling high-accuracy weldless steel tube.
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 cold rolling high-accuracy weldless steel tube is provided, the cold rolling high-accuracy weldless steel tube that the method obtains, yield strength is high, tensile strength is high, precision size, smooth surface, its store oil excellent performance, makes running more smooth and easy, without stall condition, expanded service life, is applicable to the various laborsaving automated machine engineerings such as oil hydraulic cylinder, pneumatic cylinder, fork truck, crane, stacker, building machinery, punch press.
According to technical scheme provided by the invention, a kind of manufacture method of cold rolling high-accuracy weldless steel tube comprises the steps:
(1), heating: 27SiMn pipe is heated to 1200 ~ 1280 DEG C in annular furnace, and the heat time is 3 ~ 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 1100 ~ 1150 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 500 ~ 600 DEG C, annealing time is 50 ~ 60min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 217;
(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 ~ 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 800 ~ 850 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 550 ~ 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 10 ~ 20 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 ~ 30 times/min, and the length of at every turn sending to of pipe is 6 ~ 8mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 600 ~ 800 DEG C, and hardening media is water, and temperature, at 400 ~ 550 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 500 ~ 650 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 750 ~ 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 300 ~ 400 DEG C, to reduce residual stress;
(16), honing: select vertical 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 450 ~ 550 DEG C, obtain yield strength (MPa): 896, tensile strength (MPa): 918, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high-accuracy weldless steel tube of linearity: 0.30mm/m.
Beneficial effect of the present invention is as follows: the cold rolling high-accuracy weldless steel tube utilizing the inventive method to produce, good combination property, low-temperature impact toughness is good, there is higher rotational deformation drag and wearability, its yield strength reaches 896MPa, tensile strength reaches 918MPa, cold rolling by adopting, heat treatment and straightening process, make the mechanical performance of cold rolling high-accuracy weldless steel tube body, rotational deformation drag, low-temperature impact work and anti-wear performance up to standard, by controlling the physical dimension of body, residual stress, form variations and chemical analysis, the mechanical performance of body can be ensured, high wearability, low temperature resistant and high rotational deformation drag, 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 159.3m and the hole wall wall thickness 27SiMn steel pipe that is 6.3mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1200 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 1100 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 500 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 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 800 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 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 6mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 600 DEG C, and hardening media is water, and temperature, at 400 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 500 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), honing: select vertical 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 450 DEG C, obtain yield strength (MPa): 896, tensile strength (MPa): 918, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high-accuracy weldless steel tube 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, precision.
The contrast in technical performance of a kind of cold rolling high-accuracy weldless steel tube and conventional steel pipe
Embodiment two:
To prepare diameter for 139.9mm and the hole wall wall thickness 27SiMn steel pipe that is 7.9mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1280 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 60min, obtains the annealing pipe that annealing hardness (HV) is 217;
(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 850 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 20 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 30 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 vertical 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 550 DEG C, obtain yield strength (MPa): 895, tensile strength (MPa): 917, hardness (HV): 245, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high-accuracy weldless steel tube of linearity: 0.30mm/m.
Embodiment three:
To prepare diameter for 140.4mm and the hole wall wall thickness 27SiMn steel pipe that is 8.3mm, comprise the following steps:
(1), heating: 27SiMn pipe is heated to 1240 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 1120 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 550 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 1245 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 825 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 600 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 15 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 25 times/min, and the length of at every turn sending to of pipe is 7mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 700 DEG C, and hardening media is water, and temperature, at 500 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 550 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 350 DEG C, to reduce residual stress;
(16), honing: select vertical 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 Ra0.28;
(17), thermal straightening process: be incubated 50 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 500 DEG C, obtain yield strength (MPa): 891, tensile strength (MPa): 908, hardness (HV): 240, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high-accuracy weldless steel tube of linearity: 0.30mm/m.
Claims (1)
1. the manufacture method of a cold rolling high-accuracy weldless steel tube comprises the steps:
(1), heating: 27SiMn pipe is heated to 1200 ~ 1280 DEG C in annular furnace, and the heat time is 3 ~ 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 1100 ~ 1150 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 500 ~ 600 DEG C, annealing time is 50 ~ 60min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 217;
(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 ~ 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 800 ~ 850 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 550 ~ 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 10 ~ 20 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 ~ 30 times/min, and the length of at every turn sending to of pipe is 6 ~ 8mm/ time, obtains rolled pipe;
(12), heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 600 ~ 800 DEG C, and hardening media is water, and temperature, at 400 ~ 550 DEG C, reduces the residual stress of drawn tube;
(13), pre-straightening process: straightening temperature 500 ~ 650 DEG C, to reduce residual stress;
(14), induction furnace Quenching Treatment: induction furnace hardening heat is 750 ~ 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 300 ~ 400 DEG C, to reduce residual stress;
(16), honing: select vertical 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 450 ~ 550 DEG C, obtain yield strength (MPa): 896, tensile strength (MPa): 918, hardness (HV): 250, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: 6%, the cold rolling high-accuracy weldless steel tube of linearity: 0.30mm/m.
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