CN102284485A - Process for manufacturing seamless steel tubes - Google Patents
Process for manufacturing seamless steel tubes Download PDFInfo
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- CN102284485A CN102284485A CN2011102444677A CN201110244467A CN102284485A CN 102284485 A CN102284485 A CN 102284485A CN 2011102444677 A CN2011102444677 A CN 2011102444677A CN 201110244467 A CN201110244467 A CN 201110244467A CN 102284485 A CN102284485 A CN 102284485A
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Abstract
The invention discloses a process for manufacturing seamless steel tubes, comprising the following steps of: 1) sorting; 2) punching, heating tube blanks through a walking beam furnace at a temperature in a range of 1240-1300 DEG C for 45 minutes, wherein the heated end parts of the tube blanks have a temperature difference less than 17 DEG C; carrying out a strip temperature end rolling on one end of punched tubular billets; 3) carrying out a heat treatment on the obtained tubular billets, wherein a heating temperature is in a range of 700-820 DEG C and a warming time is 25 minutes; cooling through air; 4) sizing, wherein a sizing machine uses a micro-tension sizing machine with 17 machine racks and three rollers; a sized hole pattern with a positive absolute spread is used for ensuring that the inner surfaces of steel tubes prevent from generating an internal hexagon defect; 4) carrying out the heat treatment on the finished tubes, wherein the heating temperature is in a range of 970-1000 DEG C and a warming time is 39 minutes; cooling through the air, wherein a tempering temperature is in a range of 700-745 DEG C and the warming time is 2 hours; and cooling through the air. The improved process for manufacturing the seamless steel tubes not only remains good flexibility but also extremely improves strength up to 568 MPa; meanwhile, the process is simple in procedure is low in energy consumption, thereby greatly reducing production cost.
Description
Technical field
The present invention relates to a kind of steel tube manufacture technique, particularly produce a kind of seamless steel pipe manufacturing process
Background technology
The main processes of traditional production high-performance oil well pipe is: pipe 1250-1300 ℃, add hot piercing, 950-1050 ℃ tandem rolling, take off be heated to that 950-980 ℃ of austenitizing handled behind the rod again, stretch-reducing mill in 920-950 ℃ of tube rolling, air cooling to room temperature after modified heat treatment.Because the tandem rolling temperature is higher, crystal grain is thick, takes off rod back steel pipe and enters reheating furnace at once, advances stokehold steel pipe temperature and still is higher than Ac 1 point, make austenite coarse-grain behind the tandem rolling remain into to open subtract rolling before.Because it is higher to open the tube rolling temperature that subtracts machine, in the austenite recrystallization district, rolling under the air cooling condition of back, crystal grain is still thick.This organization factors is mainly adjusted by adopting quenched and tempered steel to roll the modified heat treatment in back, obtains tissues needed and performance by quenching after rolling and temper.
Though this technology can be improved the toughness of steel pipe, intensity improves little.For improving intensity, occurred on the basis of online normalizing, improve and open the online accelerated cooling process that subtracts the back cooling velocity.Adopt this kind technology,, but still have two problems though can improve the obdurability of material: the one, be subjected to the restriction of original process layout, be difficult in the steel pipe that takes off behind the rod is cooled to below the Ac1 temperature very soon; The 2nd, the acceleration cooling velocity after the steel pipe finish to gauge is fast inadequately, can only obtain the tissue based on ferrite, can not produce other oil well pipe of N80 and higher level.
The manufacture method of existing carbon steel pipe and alloy pipe, main have perforation pipe rolling and a band shaping welding.First kind of traditional manufacture method is that carbon steel and steel alloy are cast solid billet and fixed ruler cutting, sends into two rollers after heating or three-roll piercer is worn into hollow forging again, pipe carried out Re Zha and the cold rolling finished product tubing that obtains again.This method is generally to use at present, but it is many to exist operation, and power consumption is high, can not produce overlength tube, the high deficiency of tubing manufacturing cost.
Summary of the invention
At the deficiencies in the prior art, one of purpose of the present invention is to provide the seamless steel pipe manufacturing process for achieving the above object, and the present invention adopts following technical scheme:
A kind of seamless steel pipe manufacturing process, it comprises the steps:
1) selecting materials wherein, the composition quality percentage of pipe is: C:0.24-0.37%, Si:0.2-0.45%, Mn:1.2-1.91%, V:0.08-0.21%, Cu:1.22-1.88%, N:0.019-0.026%, P:0.020-0.0280%Cr:2.6-3.2%, surplus is Fe and inevitable impurity;
2) the perforation process pipe is 1240-1300 ℃ of heating through walking beam furnace in temperature, 45 minutes its heat time heating times; The heating of pipe blank end temperature difference is not more than 17 ℃; The perforation of heating back; Hollow billet one end after the perforation is with the warm-rolling head, and dog will guarantee that hollow billet center line and hollow billet head center line are consistent, and must not reverse, overlap, torticollis phenomenon;
3) to 2) hollow billet that obtains heat-treats: its process conditions are: heating-up temperature 770-820 ℃; Temperature retention time 25 minutes; The air cooling;
4) sizing: sizing mill adopts 17 frames, three roller slight stretch sizing mills, prevents to produce interior six side's defectives for guaranteeing steel pipe internal-surface, adopts the sizing pass of positive absolute spread;
5) above-mentioned production tube is heat-treated: its process conditions are: heating-up temperature 970-1000 ℃; Temperature retention time 39 minutes; The air cooling; Temperature 700-745 ℃; About temperature retention time 2 hours; The air cooling.
The heating-up temperature of step 5) is 985 ℃.
The temperature of step 5) is 725 ℃, and be 2h heat time heating time.
Step 2) heating-up temperature is 1275 ℃.
Step 2) the heating of pipe blank end temperature difference is not more than 12 ℃.
One of outstanding advantage of the present invention is in the selection of blank that the blank of this composition obtains through common melting technique founding, and key is the control of composition;
Two of outstanding advantage is: because specific composition, thereby its technology reforms, and makes the properties of product of producing improve greatly.
The specific embodiment
Embodiment one
A kind of seamless steel pipe manufacturing process, it comprises the steps:
1) selecting materials wherein, the composition quality percentage of pipe is: C:0.24%, and Si:0.2%, Mn:1.2-%, V:0.08%, Cu:1.22%, N:0.019%, P:0.020%Cr:2.6%, surplus is Fe and inevitable impurity;
2) the perforation process pipe is 1240 ℃ of heating through walking beam furnace in temperature, 45 minutes its heat time heating times; 14 ℃ of the heating of pipe blank end temperature difference; The perforation of heating back; Hollow billet one end after the perforation is with the warm-rolling head, and dog will guarantee that hollow billet center line and hollow billet head center line are consistent, and must not reverse, overlap, torticollis phenomenon;
3) to 2) hollow billet that obtains heat-treats: its process conditions are: 770 ℃ of heating-up temperatures; Temperature retention time 25 minutes; The air cooling;
4) sizing: sizing mill adopts 17 frames, three roller slight stretch sizing mills, prevents to produce interior six side's defectives for guaranteeing steel pipe internal-surface, adopts the sizing pass of positive absolute spread;
5) above-mentioned production tube is heat-treated: its process conditions are: 970 ℃ of heating-up temperatures; Temperature retention time 39 minutes; The air cooling; 700 ℃ of temperatures; About temperature retention time 2 hours; The air cooling.
Embodiment two
A kind of seamless steel pipe manufacturing process, it comprises the steps:
1) selecting materials wherein, the composition quality percentage of pipe is: C:0.37%, and Si:0.45%, Mn:1.91%, V:0.21%, Cu:1.88%, N:0.026%, P:0.0280%Cr:3.2%, surplus is Fe and inevitable impurity;
2) the perforation process pipe is 1300 ℃ of heating through walking beam furnace in temperature, 45 minutes its heat time heating times; 17 ℃ of the heating of pipe blank end temperature difference; The perforation of heating back; Hollow billet one end after the perforation is with the warm-rolling head, and dog will guarantee that hollow billet center line and hollow billet head center line are consistent, and must not reverse, overlap, torticollis phenomenon;
3) to 2) hollow billet that obtains heat-treats: its process conditions are: 820 ℃ of heating-up temperatures; Temperature retention time 25 minutes; The air cooling;
4) sizing: sizing mill adopts 17 frames, three roller slight stretch sizing mills, prevents to produce interior six side's defectives for guaranteeing steel pipe internal-surface, adopts the sizing pass of positive absolute spread;
5) above-mentioned production tube is heat-treated: its process conditions are: 1000 ℃ of heating-up temperatures; Temperature retention time 39 minutes; The air cooling; 745 ℃ of temperatures; About temperature retention time 2 hours; The air cooling.
Embodiment three
A kind of seamless steel pipe manufacturing process, it comprises the steps:
1) selecting materials wherein, the composition quality percentage of pipe is: C:0.3%, and Si:0.35%, Mn:1.45%, V:0.16%, Cu:1.65%, N:0.02%, P:0.024%Cr:2.8%, surplus is Fe and inevitable impurity;
2) the perforation process pipe is 1275 ℃ of heating through walking beam furnace in temperature, 45 minutes its heat time heating times; 12 ℃ of the heating of pipe blank end temperature difference; The perforation of heating back; Hollow billet one end after the perforation is with the warm-rolling head, and dog will guarantee that hollow billet center line and hollow billet head center line are consistent, and must not reverse, overlap, torticollis phenomenon;
3) to 2) hollow billet that obtains heat-treats: its process conditions are: heating-up temperature 770-820 ℃; Temperature retention time 25 minutes; The air cooling;
4) sizing: sizing mill adopts 17 frames, three roller slight stretch sizing mills, prevents to produce interior six side's defectives for guaranteeing steel pipe internal-surface, adopts the sizing pass of positive absolute spread;
5) above-mentioned production tube is heat-treated: its process conditions are: 985 ℃ of heating-up temperatures; Temperature retention time 39 minutes; The air cooling; 725 ℃ of temperatures; About temperature retention time 2 hours; The air cooling.
Applicant's statement, the present invention illustrates detailed process equipment of the present invention and technological process by the foregoing description, but the present invention is not limited to above-mentioned detailed process equipment and technological process, does not mean that promptly the present invention must rely on above-mentioned detailed process equipment and technological process could be implemented.The person of ordinary skill in the field should understand, any improvement in the present invention to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (5)
1. seamless steel pipe manufacturing process, it comprises the steps:
1) selects materials
Wherein the composition quality percentage of pipe is: C:0.24-0.37%, Si:0.2-0.45%, Mn:1.2-1.91%, V:0.08-0.21%, Cu:1.22-1.88%, N:0.019-0.026%, P:0.020-0.0280%Cr:2.6-3.2%, surplus is Fe and inevitable impurity;
2) perforation process
Pipe is 1240-1300 ℃ of heating through walking beam furnace in temperature, 45 minutes its heat time heating times; The heating of pipe blank end temperature difference is not more than 17 ℃; The perforation of heating back; Hollow billet one end after the perforation is with the warm-rolling head, and dog will guarantee that hollow billet center line and hollow billet head center line are consistent, and must not reverse, overlap, torticollis phenomenon;
3) to 2) hollow billet that obtains heat-treats: its process conditions are: heating-up temperature 770-820 ℃; Temperature retention time 25 minutes; The air cooling;
4) sizing: sizing mill adopts 17 frames, three roller slight stretch sizing mills, prevents to produce interior six side's defectives for guaranteeing steel pipe internal-surface, adopts the sizing pass of positive absolute spread;
5) above-mentioned production tube is heat-treated: its process conditions are: heating-up temperature 970-1000 ℃; Temperature retention time 39 minutes; The air cooling; Temperature 700-745 ℃; About temperature retention time 2 hours; The air cooling.
2. method according to claim 1, the heating-up temperature that it is characterized in that step 5) is 985 ℃.
3. method according to claim 1, the temperature that it is characterized in that step 5) is 725 ℃, be 2h heat time heating time.
4. method according to claim 1 is characterized in that step 2) heating-up temperature be 1275 ℃.
5. method according to claim 1 is characterized in that step 2) the heating of pipe blank end temperature difference is not more than 12 ℃.
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| CN2011102444677A CN102284485A (en) | 2011-08-24 | 2011-08-24 | Process for manufacturing seamless steel tubes |
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| CN2011102444677A CN102284485A (en) | 2011-08-24 | 2011-08-24 | Process for manufacturing seamless steel tubes |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525568A (en) * | 2014-11-11 | 2015-04-22 | 江苏华程工业制管股份有限公司 | Machining method of carburized bearing steel seamless steel tube |
| CN104525569A (en) * | 2014-11-11 | 2015-04-22 | 江苏华程工业制管股份有限公司 | Method for machining spring steel seamless steel tube |
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2011
- 2011-08-24 CN CN2011102444677A patent/CN102284485A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525568A (en) * | 2014-11-11 | 2015-04-22 | 江苏华程工业制管股份有限公司 | Machining method of carburized bearing steel seamless steel tube |
| CN104525569A (en) * | 2014-11-11 | 2015-04-22 | 江苏华程工业制管股份有限公司 | Method for machining spring steel seamless steel tube |
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Application publication date: 20111221 |