CN104338781A - Method for manufacturing high-hardness cold-drawn steel tube - Google Patents
Method for manufacturing high-hardness cold-drawn steel tube Download PDFInfo
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- CN104338781A CN104338781A CN201310339421.2A CN201310339421A CN104338781A CN 104338781 A CN104338781 A CN 104338781A CN 201310339421 A CN201310339421 A CN 201310339421A CN 104338781 A CN104338781 A CN 104338781A
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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-hardness cold-drawn steel tube. The method for manufacturing the high-hardness cold-drawn steel tube comprises the following steps of heating, wherein a tube blank is heated in an annular furnace, and it is ensured that the tube blank is evenly heated; hole punching, wherein hole punching is carried out on a heat tube blank through a puncher; annealing, the tube blank is annealed; cold drawing, the annealed tube blank is introduced into a tube mill, cold drawing is carried out on the annealed tube blank, and a rolled tube is obtained; stress relief annealing, wherein the rolled tube is introduced into a heating furnace to be heated and kept warm, and an annealed tube blank is obtained; acid pickling treatment, wherein acid pickling is carried out on the annealed tube blank, and surface rust scales are removed; parkerizing, wherein a zinc phosphate chemical generation covering film is formed on the surface of the tube blank; saponification treatment, lubrication covering films like metallic soap are formed on the covering film; cold drawing, cold drawing machining is carried out on the tube blank to be cold drawn, and the cold-drawn tube is obtained; finished product heat treatment, wherein the cold-drawn tube is introduced into an annealing furnace, then, finished product heat treatment is carried out on the cold-drawn tube, and the high-hardness cold-drawn steel tube is obtained. According to the method, the steel tube with the high hardness and the excellent surface performance for a mechanical structure is obtained.
Description
Technical field
The invention belongs to steel pipe preparing technical field, be specifically related to a kind of manufacture method of high rigidity cold drawing 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, can manufacture cold working steel pipe expeditiously, but product hardness can not be guaranteed.In recent years, be used as the steel for mechanical structure pipe of the various frame for movement components headed by automobile, from the viewpoint of the lightweight etc. of structural elements, require high rigidity, therefore, owing to requiring high rigidity, need to anneal in the atmosphere adjustment stove of low temperature after cold-drawn, when implementing this annealing, by promoting the thermal decomposition of remaining lubricating oil, lubricating oil is fully volatilized remove etc. to seek to reduce annealing residue, this becomes the problem of new needs solution.
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 high rigidity cold drawing steel tube, the method obtains the steel for mechanical structure pipe that hardness is high, surface property is excellent.
According to technical scheme provided by the invention, a kind of manufacture method of high rigidity cold drawing steel tube comprises the steps:
(1), heating: 33Mn2V pipe is heated to 1280 ~ 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: drawn tube is introduced annealing furnace and carry out finished product heat treatment, object is the intensity guaranteeing steel pipe, the processing strain produced by cold-drawn is remained, when annealing temperature is too high, processing strain recovers, the effect of work hardening can not be obtained, annealing temperature is 500 ~ 650 DEG C, the effect of work hardening can be obtained, in order to remove the strength variance of cold drawing steel tube, in the stove of cold drawing steel tube, the retention time is 8 ~ 10 hours, and the tapping temperature of cold drawing steel tube is 350 ~ 450 DEG C, obtain hardness (HV) 230 ~ 268 high rigidity cold drawing steel tube.
Method of the present invention obtains the steel for mechanical structure pipe that hardness 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 339.7mm and the hole wall wall thickness 33Mn2V steel pipe that is 5.9mm, comprise the following steps:
(1), heating: 33Mn2V 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 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: drawn tube is introduced annealing furnace and carry out finished product heat treatment, object is the intensity guaranteeing steel pipe, the processing strain produced by cold-drawn is remained, when annealing temperature is too high, processing strain recovers, the effect of work hardening can not be obtained, annealing temperature is 500 DEG C, the effect of work hardening can be obtained, in order to remove the strength variance of cold drawing steel tube, in the stove of cold drawing steel tube, the retention time is 8 hours, and the tapping temperature of cold drawing steel tube is 350 DEG C, obtain hardness (HV) 230 high rigidity cold drawing steel tube.
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 that the hardness (HV) required by user is greater than 220.
The contrast in technical performance of a kind of high rigidity cold drawing steel tube and conventional steel pipe
Embodiment two:
To prepare diameter for 139.8mm and the hole wall wall thickness 33Mn2V steel pipe that is 7.7mm, 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: drawn tube is introduced annealing furnace and carry out finished product heat treatment, object is the intensity guaranteeing steel pipe, the processing strain produced by cold-drawn is remained, when annealing temperature is too high, processing strain recovers, the effect of work hardening can not be obtained, annealing temperature is 650 DEG C, the effect of work hardening can be obtained, in order to remove the strength variance of cold drawing steel tube, in the stove of cold drawing steel tube, the retention time is 10 hours, and the tapping temperature of cold drawing steel tube is 450 DEG C, obtain hardness (HV) 268 high rigidity cold drawing steel tube.
Embodiment three:
To prepare diameter for 140.5mm and the hole wall wall thickness 33Mn2V steel pipe that is 8.4mm, comprise the following steps:
(1), heating: 33Mn2V pipe is heated to 1320 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 213;
(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: 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;
(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: 60;
(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: 400t, and saponification pipe pulls out the front storage period: 84h;
(10), finished product heat treatment: drawn tube is introduced annealing furnace and carry out finished product heat treatment, object is the intensity guaranteeing steel pipe, the processing strain produced by cold-drawn is remained, when annealing temperature is too high, processing strain recovers, the effect of work hardening can not be obtained, annealing temperature is 600 DEG C, the effect of work hardening can be obtained, in order to remove the strength variance of cold drawing steel tube, in the stove of cold drawing steel tube, the retention time is 9 hours, and the tapping temperature of cold drawing steel tube is 400 DEG C, obtain hardness (HV) 250 high rigidity cold drawing steel tube.
Claims (1)
1. the manufacture method of a high rigidity cold drawing steel tube comprises the steps:
(1), heating: 33Mn2V pipe is heated to 1280 ~ 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: drawn tube is introduced annealing furnace and carry out finished product heat treatment, object is the intensity guaranteeing steel pipe, the processing strain produced by cold-drawn is remained, when annealing temperature is too high, processing strain recovers, the effect of work hardening can not be obtained, annealing temperature is 500 ~ 650 DEG C, the effect of work hardening can be obtained, in order to remove the strength variance of cold drawing steel tube, in the stove of cold drawing steel tube, the retention time is 8 ~ 10 hours, and the tapping temperature of cold drawing steel tube is 350 ~ 450 DEG C, obtain hardness (HV) 230 ~ 268 high rigidity cold drawing steel tube.
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| CN201310339421.2A CN104338781A (en) | 2013-07-31 | 2013-07-31 | Method for manufacturing high-hardness cold-drawn steel tube |
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| CN201310339421.2A CN104338781A (en) | 2013-07-31 | 2013-07-31 | Method for manufacturing high-hardness cold-drawn steel tube |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108296717A (en) * | 2018-02-06 | 2018-07-20 | 江苏健力钢管有限公司 | A kind of preparation process of Steel Pipe For Bearing |
| CN108979010A (en) * | 2018-09-21 | 2018-12-11 | 重庆奇甫机械有限责任公司 | Full grout sleeve of a kind of extruding steel and preparation method thereof |
| CN112317540A (en) * | 2020-08-27 | 2021-02-05 | 陈恩义 | Method for processing hollow steel pipe of drill rod |
| 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 |
-
2013
- 2013-07-31 CN CN201310339421.2A patent/CN104338781A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108296717A (en) * | 2018-02-06 | 2018-07-20 | 江苏健力钢管有限公司 | A kind of preparation process of Steel Pipe For Bearing |
| CN108979010A (en) * | 2018-09-21 | 2018-12-11 | 重庆奇甫机械有限责任公司 | Full grout sleeve of a kind of extruding steel and preparation method thereof |
| CN112317540A (en) * | 2020-08-27 | 2021-02-05 | 陈恩义 | Method for processing hollow steel pipe of drill rod |
| 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 |
| 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 |
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