CN104338779A - A method for manufacturing a high-precision cold-drawn steel pipe - Google Patents
A method for manufacturing a high-precision cold-drawn steel pipe Download PDFInfo
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- CN104338779A CN104338779A CN201310339378.XA CN201310339378A CN104338779A CN 104338779 A CN104338779 A CN 104338779A CN 201310339378 A CN201310339378 A CN 201310339378A CN 104338779 A CN104338779 A CN 104338779A
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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
Abstract
The invention relates to a method for manufacturing a high-precision cold-drawn steel pipe. The method comprises the following steps: heating: heating a pipe blank in a circular furnace for guaranteeing that the pipe blank is evenly heated; perforating: perforating the heated pipe blank with a perforator; annealing: annealing the pipe blank; cold rolling: introducing the annealed pipe blank into a pipe mill for cold rolling to obtain a rolled pipe; stress relief annealing: introducing the rolled pipe into a heating furnace for heating and preserving heat to obtain an annealed pipe blank; acid washing treatment: performing acid washing to the annealed pipe blank to remove rust scale on the surface; phosphating treatment: forming a chemically generated coating of zinc phosphate on the surface of the pipe blank; saponifying treatment: forming a lubricant coating like metallic soap on the coating; cold drawing: cold drawing the pipe blank to be cold drawn to obtain a cold-drawn pipe; heat treatment for finished product: applying a heat treatment process for first quenching and then tempering to reduce residual stress of the cold-drawn pipe; and hot straightening treatment: obtaining a high-precision cold-drawn steel pipe. The method of the invention provides steel pipes with high precision and superior surface performance used for a mechanical structure.
Description
Technical field
The invention belongs to steel pipe preparing technical field, be specifically related to a kind of manufacture method of Hi-precision cold-drawn 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, can manufacture cold working steel pipe expeditiously, but Product Precision can not be guaranteed.The technical difficult points that current restriction cold drawing steel tube precision improves has: Technology for Heating Processing and method for aligning is unreasonable causes that cold drawing steel tube residual stress is too high, geometric accuracy is poor.These problems cause current cold drawing steel tube unstable properties, constrain the development of China's cold drawing steel tube.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of manufacture method of Hi-precision cold-drawn tube, the method obtains the steel for mechanical structure pipe that precision is high, surface property is excellent.
According to technical scheme provided by the invention, a kind of manufacture method of Hi-precision cold-drawn tube comprises the steps:
(1), heating: 33Mn2V pipe is heated to 1300 ~ 1380 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 1250 ~ 1350 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 ~ 90min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 217;
(4), cold rolling: it is cold rolling that pipe of annealing introduces pipe mill, and the reciprocal time of the headstock of pipe mill is 50 ~ 60 times/min, and the length of at every turn sending to of pipe is 6 ~ 7mm/ time, obtains rolled pipe;
(5), 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;
(6), 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;
(7), 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;
(8), 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;
(9), 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;
(10), finished product heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 800 ~ 900 DEG C, and hardening media is water, and temperature, at 550 ~ 650 DEG C, reduces the residual stress of drawn tube;
(11), thermal straightening process: be incubated 45 ~ 60 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 450 ~ 480 DEG C, obtain outer diameter tolerance: be less than+1.0%, wall thickness tolerance: be less than 10%, external diameter out-of-roundness: be less than 0.4%, eccentricity: be less than the Hi-precision cold-drawn tube of 10%.
Method of the present invention obtains the steel for mechanical structure pipe that precision is high, surface property is excellent.
Detailed description of the invention:
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment one:
To prepare diameter for 114.3mm and the hole wall wall thickness 33Mn2V steel pipe that is 6.3mm, comprise the following steps:
(1), heating: 33Mn2V pipe is heated to 1300 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 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 600 DEG C, annealing time is 70min, obtains the annealing pipe that annealing hardness (HV) is 210;
(4), cold rolling: it is cold rolling that pipe of annealing introduces pipe mill, and the reciprocal time of the headstock of pipe mill is 50 times/min, and the length of at every turn sending to of pipe is 6mm/ time, obtains rolled pipe;
(5), 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;
(6), 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;
(7), 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;
(8), 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;
(9), 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: 350t, and saponification pipe pulls out the front storage period: 72h;
(10), finished product 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;
(11), thermal straightening process: be incubated 45 minutes in low-temp temper furnace, then carry out thermal straightening process, thermal straightening temperature 450 DEG C, obtain outer diameter tolerance :+0.5%, wall thickness tolerance: 8%, external diameter out-of-roundness: 0.3%, eccentricity: the Hi-precision cold-drawn tube of 6%.
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 precision.
The contrast in technical performance of a kind of Hi-precision cold-drawn tube and conventional steel pipe
Embodiment two:
To prepare diameter for 114.8mm and the hole wall wall thickness 33Mn2V steel pipe that is 6.9mm, comprise the following steps:
(1), heating: 33Mn2V pipe is heated to 1380 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 1350 DEG C, and order control punch eccentricity is 5%, 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 90min, obtains the annealing pipe that annealing hardness (HV) is 217;
(4), cold rolling: it is cold rolling that pipe of annealing introduces pipe mill, and the reciprocal time of the headstock of pipe mill is 60 times/min, and the length of at every turn sending to of pipe is 7mm/ time, obtains rolled pipe;
(5), 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;
(6), 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;
(7), 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;
(8), 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;
(9), 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;
(10), finished product heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 900 DEG C, and hardening media is water, and temperature, at 650 DEG C, reduces the residual stress of drawn tube;
(11), thermal straightening process: be incubated 60 minutes in low-temp temper furnace, then carry out thermal straightening process, thermal straightening temperature 480 DEG C, obtain outer diameter tolerance :+0.6%, wall thickness tolerance: 7%, external diameter out-of-roundness: 0.35%, eccentricity: the Hi-precision cold-drawn tube of 7%.
Embodiment three:
To prepare diameter for 114.4mm and the hole wall wall thickness 33Mn2V steel pipe that is 6.3mm, comprise the following steps:
(1), heating: 33Mn2V pipe is heated to 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 1300 DEG C, and order control punch eccentricity is 4.5%, 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 80min, obtains the annealing pipe that annealing hardness (HV) is 215;
(4), cold rolling: it is cold rolling that pipe of annealing introduces pipe mill, and the reciprocal time of the headstock of pipe mill is 55 times/min, and the length of at every turn sending to of pipe is 6.5mm/ time, obtains rolled pipe;
(5), 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;
(6), pickling processes: annealing pipe is carried out pickling, removes the scale on surface, concentration of hydrochloric acid: 15%, 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;
(7), 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: 5, General Acidity in Phosphating Solution: 65;
(8), saponification process: form the lubricating film coateds such as metallic soap on overlay film, saponification temperature: 65 DEG C, saponification time: 12 minutes, saponification liquor pH value: 8.5;
(9), 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: 390t, and saponification pipe pulls out the front storage period: 84h;
(10), finished product 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 600 DEG C, reduces the residual stress of drawn tube;
(11), thermal straightening process: be incubated 50 minutes in low-temp temper furnace, then carry out thermal straightening process, thermal straightening temperature 470 DEG C, obtain outer diameter tolerance :+0.55%, wall thickness tolerance: 6%, external diameter out-of-roundness: 0.25%, eccentricity: the Hi-precision cold-drawn tube of 7%.
Claims (1)
1. the manufacture method of a Hi-precision cold-drawn tube comprises the steps:
(1), heating: 33Mn2V pipe is heated to 1300 ~ 1380 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 1250 ~ 1350 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 ~ 90min, obtains the annealing pipe that annealing hardness (HV) is 210 ~ 217;
(4), cold rolling: it is cold rolling that pipe of annealing introduces pipe mill, and the reciprocal time of the headstock of pipe mill is 50 ~ 60 times/min, and the length of at every turn sending to of pipe is 6 ~ 7mm/ time, obtains rolled pipe;
(5), 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;
(6), 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;
(7), 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;
(8), 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;
(9), 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;
(10), finished product heat treatment: the Technology for Heating Processing adopting tempering again after quenching, hardening heat is 800 ~ 900 DEG C, and hardening media is water, and temperature, at 550 ~ 650 DEG C, reduces the residual stress of drawn tube;
(11), thermal straightening process: be incubated 45 ~ 60 minutes in low-temp temper furnace, carry out thermal straightening process again, thermal straightening temperature 450 ~ 480 DEG C, obtain outer diameter tolerance: be less than+1.0%, wall thickness tolerance: be less than 10%, external diameter out-of-roundness: be less than 0.4%, eccentricity: be less than the Hi-precision cold-drawn tube of 10%.
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| CN201310339378.XA CN104338779A (en) | 2013-07-31 | 2013-07-31 | A method for manufacturing a high-precision cold-drawn steel pipe |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734784A (en) * | 2016-11-22 | 2017-05-31 | 青岛征和工业股份有限公司 | The preparation method and silent chain of a kind of silent chain abnormity bearing pin |
| CN107377664A (en) * | 2017-07-26 | 2017-11-24 | 繁昌县华特机械制造有限公司 | A kind of processing technology of pipe with small pipe diameter thin-wall steel tube |
| CN109604370A (en) * | 2018-10-30 | 2019-04-12 | 湖北新冶钢特种钢管有限公司 | A kind of drill collar high-accuracy weldless steel tube and preparation method thereof |
| CN110788160A (en) * | 2019-11-07 | 2020-02-14 | 鑫鹏源智能装备集团有限公司 | Seamless steel tube production system and process |
| CN112108530A (en) * | 2020-09-04 | 2020-12-22 | 江苏宏亿钢管有限公司 | Manufacturing method of high-strength cold-drawn steel pipe |
| CN113059019A (en) * | 2021-03-25 | 2021-07-02 | 江苏建中新材料科技有限公司 | Acid-resistant heat exchanger steel pipe and preparation method thereof |
| CN113245369A (en) * | 2021-05-19 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of pipe for PMMA reactor |
| CN113245857A (en) * | 2021-05-06 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of heat exchange tube for seawater desalination evaporator |
| 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 |
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- 2013-07-31 CN CN201310339378.XA patent/CN104338779A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106734784A (en) * | 2016-11-22 | 2017-05-31 | 青岛征和工业股份有限公司 | The preparation method and silent chain of a kind of silent chain abnormity bearing pin |
| CN107377664A (en) * | 2017-07-26 | 2017-11-24 | 繁昌县华特机械制造有限公司 | A kind of processing technology of pipe with small pipe diameter thin-wall steel tube |
| CN109604370A (en) * | 2018-10-30 | 2019-04-12 | 湖北新冶钢特种钢管有限公司 | A kind of drill collar high-accuracy weldless steel tube and preparation method thereof |
| CN110788160A (en) * | 2019-11-07 | 2020-02-14 | 鑫鹏源智能装备集团有限公司 | Seamless steel tube production system and process |
| CN112108530A (en) * | 2020-09-04 | 2020-12-22 | 江苏宏亿钢管有限公司 | Manufacturing method of high-strength cold-drawn steel pipe |
| CN113059019A (en) * | 2021-03-25 | 2021-07-02 | 江苏建中新材料科技有限公司 | Acid-resistant heat exchanger steel pipe and preparation method thereof |
| CN113245857A (en) * | 2021-05-06 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of heat exchange tube for seawater desalination evaporator |
| 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 |
| CN113245857B (en) * | 2021-05-06 | 2023-03-14 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of heat exchange tube for seawater desalination evaporator |
| CN113245369A (en) * | 2021-05-19 | 2021-08-13 | 张家港保税区恒隆钢管有限公司 | Manufacturing process of pipe for PMMA reactor |
| CN113245369B (en) * | 2021-05-19 | 2022-08-09 | 张家港保税区亚鑫精密制管有限公司 | Manufacturing process of pipe for PMMA reactor |
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Application publication date: 20150211 |