CN105290145B - A kind of production method of 100 DEG C of ultralow temperature seamless steel pipes - Google Patents
A kind of production method of 100 DEG C of ultralow temperature seamless steel pipes Download PDFInfo
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- CN105290145B CN105290145B CN201510881339.1A CN201510881339A CN105290145B CN 105290145 B CN105290145 B CN 105290145B CN 201510881339 A CN201510881339 A CN 201510881339A CN 105290145 B CN105290145 B CN 105290145B
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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 discloses a kind of production method of 100 DEG C of ultralow temperature seamless steel pipes, its technological process is as follows：VD continuous casting billets → blank excision → blank heating → perforation → MPM rolling pipes → hot saw end to end → cooling → aligning → finishing → size and surface quality inspection → packaging and storage.The present invention is for the service condition of seamless steel pipe and large, medium and small size heterogeneity research tube-rolling technique, ensure that the dimensional accuracy of produced seamless steel pipe meets ASTM/ASME demand of technical standard, develop geometric accuracy, inside and outside surface quality meets petrochemical industry low-temperature pressure container seamless steel pipe, realizes really production domesticization research.
Description
Technical field
The present invention relates to the production method of ultralow temperature seamless steel pipe, and in particular to a kind of -100 DEG C of ultralow temperature seamless steel pipes
Production method.
Background technology
As the petrochemical industry that puts into operation of Chinese large-sized oil plant and petrochemical industry project is greatly increased with the demand of seamless steel pipe,
Seamless steel pipe demand dedicated for oil refining and petroleum chemical industry is gradually increased.Petrochemical equipment includes being hydrocracked, being hydrogenated with
The special equipments such as refined, hydrogen manufacturing, reformation, catalysis, ethene, coking, which use substantial amounts of pipeline.There is part to constitute these pipes
The seamless steel pipe in road is chronically at low-temperature degradation environment, causes tubing performance to decline, the especially decline of impact property.It is right
For low-temperature (low temperature) vessel, stored medium temperature is lower, and the pressure that container is subjected to is just smaller, thus security reliability gets over
It is good.Petrochemical industry, the Cryo Equipment of the industry such as chemical fertilizer needs the low temperature below -80 DEG C to make gas liquefaction, and 3.5Ni (i.e. Gr.3) is low
At most, annual requirement is at 7000 tons or so for Wen Gang usage amount.
It is reported that claim Taiyuan steel mill once to develop 3.5Ni steel, but object performance has a long way to go with external product, and performance pole
It is unstable, especially -100 DEG C low-temperature impact toughness, therefore fail to be produced in batches, thus 3.5Ni steel not yet can be in China
Industrialized production is carried out, correlation engineering all relies on import with steel pipe.
To meet the market demand of -100 DEG C of ultra-low temperature container low temperature seamless steel pipes of petrochemical industry, it is low to develop cost, geometry
Dimensional accuracy is high, and -100 DEG C of high ultra-low temperature containers of inside and outside surface quality are turned into when business with the production method of low temperature seamless steel pipe
It is anxious.
The content of the invention
[technical problem to be solved]
Present invention aim to address above-mentioned problem of the prior art, there is provided a kind of -100 DEG C of ultralow temperature seamless steel pipes
Production method.- 100 DEG C of ultralow temperature seamless steel pipe dimensional accuracies of this method production, inside and outside surface quality meets ASME/ASTM skills
Art code requirement.
[technical scheme]
In order to reach above-mentioned technique effect, the present invention takes following technical scheme：
A kind of production method of -100 DEG C of ultralow temperature seamless steel pipes, its technological process is as follows：
VD continuous casting billets → blank cutting → blank heating → perforation → MPM rolling pipes → hot saw end to end → cooling → aligning
→ finishing → size and surface quality inspection → packaging and storage；
The blank heating is heated in annular furnace, not heat supply section temperature≤780 DEG C, the annular furnace in its annular furnace
Middle holding reducing atmosphere, time of the blank heating is the blank come out of the stove after 320~360min, and the blank heating
Temperature is 1235~1255 DEG C；
The perforation needs the hollow billet obtained after control punch straight, and total length external diameter is controlled in 428~432mm；
The MPM rolling pipes are that the hollow billet that the plug that temperature is 90~110 DEG C is inserted into temperature >=1100 DEG C is enterprising
Row rolling, and it is 2.8~3.0m/s to need control milling train muzzle velocity in the operation of rolling, the retained speed of plug is 2.4~
2.5m/s；Waste thickness of pipe wall extreme difference≤3.0mm that the MPM rolling pipes are obtained.
According to the present invention further technical scheme, during the blank heating, the blank with before and after blank
The ranking of sky 6~8 is put, and the spacing of blank and blank is 860mm in annular furnace.
According to the present invention further technical scheme, the blank heating is divided into preheating section, bringing-up section and soaking zone.
According to the present invention further technical scheme, the rate of heat addition of the bringing-up section is 10~60 DEG C/h, described equal
The rate of heat addition of hot arc is 5~5.45 DEG C/h.
According to the present invention further technical scheme, the preheating section is pre- under conditions of temperature is 565~785 DEG C
Heat >=90min；The bringing-up section be divided into heating 1 section, heating 2 sections, heating 3 sections, it is described heating 1 section be temperature be 1160~
Under conditions of 1220 DEG C heat 40~50min, 2 sections of the heating be temperature be 1230~1240 DEG C under conditions of Jia 40~
50min, 3 sections of the heating is to heat 40~50min under conditions of temperature is 1255~1265 DEG C；The soaking zone is in temperature
For 110~120min of soaking under conditions of 1250~1260 DEG C.
According to the present invention further technical scheme, during the MPM rolling pipes, the plug is in position to be worn
Temperature at 80 DEG C~100 DEG C.
According to the present invention further technical scheme, during the MPM rolling pipes, milling train muzzle velocity need to be controlled
For 3.5m/s.
The present invention is will be described in detail below.
Blank is heated in annular furnace, and the blank is put with the ranking of sky 6~8 before and after blank, and the blank in annular furnace
Be 860mm with the spacing of blank, be in order to ensure other blank temperatures do not influence heating the heating-up temperature of blank, and
Heating needs uniform at a slow speed in ensureing heat in annular furnace, it is ensured that equal thermal effect, and heating must not occur producing the moon because heating is uneven
Sunny side, impermeable heating, overheat, burn-off phenomenon；If production is abnormal and stops the time of rolling longer (more than 20min) temporarily, Ying Shi
When reduction furnace temperature is to temperature≤1240 DEG C, reduction furnace temperature stops rolling more than 60min to temperature≤1230 DEG C when stopping rolling more than 40min
When reduction furnace temperature to 1160 DEG C of temperature ＜, and often rotary furnace bottom.
The heat time of blank should be fully ensured that in the heating process of blank, if total heat time is less than 320min,
Its steel billet tissue is unable to complete austenitizing；If total heat time is higher than 360min, autstenitic grain size can be caused thick, on
Two kinds of situations are stated to low-temperature impact, especially -100 DEG C low-temperature impact influences are very big.
According to different production specifications, corresponding perforating head size is matched, needs to ensure that hollow billet is visually straight after perforation, entirely
Long external diameter is in the same size.
During MPM limiting mandrel tandem rolling pipe machine rolling pipes are carried out, hollow billet is enclosed on the long plug by lubrication,
Carry out continuously subtracting wall extensional in feeding MPM.The waste thickness of pipe wall extreme difference obtained after rolling is controlled into the scope in≤3.0mm
It is interior, it is because the hollow forging geometric accuracy that the unit is produced directly influences the geometric accuracy of fished pipe.And
When carrying out MPM rolling pipes, as far as possible using the measured mandrel rolling of matter, mandrel lubrication is good.And adjust each frame of tandem rolling tube machine
Tension force, it is ensured that each frame rolling force curve of tandem rolling is normal.
[beneficial effect]
The present invention compared with prior art, with following beneficial effect：
- 100 DEG C of ultralow temperature seamless steel pipe physical dimension produced by the invention, inside and outside surface quality fully meets and is better than
ASME/ASTM demand of technical standard.Simple production process of the present invention, lumber recovery is high, and cost is low, and production efficiency is high, realize-
The localization of 100 DEG C of ultralow temperature seamless steel pipes.
Embodiment
With reference to embodiments of the invention, the invention will be further elaborated.
Embodiment：
The present embodiment purpose is to prepare external diameter for Φ 356mm, external diameter allowable tolerance (- 0.8mm ,+2.4mm), wall thickness 24mm,
Length >=6mm, wall thickness allowable tolerance is ± 12.5%, and ovality≤1.5%, -100 DEG C of eccentricity≤3.0mm are ultralow
Warm seamless steel pipe.
Technological process is as follows：
Φ 350mmVD continuous casting billets → blank excision → blank heating → perforation → 340mmMPM rolling pipes → hot saw is end to end
→ cooling → aligning → finishing → size and surface quality inspection → packaging and storage.Wherein, the blank heating is added in annular
Blank spacing is placed for 860mm in empty 6 row, stove before and after the heating carried out in hot stove under reducing atmosphere, the blank.And institute
It is specifically to include preheating section, bringing-up section and soaking zone to state blank heating.The preheating section is in the bar that temperature is 565~785 DEG C
Preheating >=90min under part；The bringing-up section is divided into 1 section of heating, 2 sections of heating, 3 sections of heating, and 1 section of the heating is to be in temperature
40~50min is heated under conditions of 1160~1220 DEG C, 2 sections of the heating is added under conditions of temperature is 1230~1240 DEG C
40~50min, 3 sections of the heating is to heat 40~50min under conditions of temperature is 1255~1265 DEG C；The soaking zone exists
Temperature is 110~120min of soaking under conditions of 1250~1260 DEG C.
The perforation is that, according to -100 DEG C of ultralow temperature seamless steel pipes of preparation, the piercing process parameter of selection is as follows：Ingot shape
For Φ 350mm, capillary outer diameter be Φ 428mm, entrance guide internal diameter be 370mm, godet width be 304mm, come directly towards it is a diameter of
321mm, top length are 780mm, and a diameter of 320mm of push rod, de- pipe ring internal diameter are 357mm.
The continuous rolling-tube unit pass and size Control of the 340mmMPM rolling pipes are as follows：Specification be Φ 356mm ×
After 24mm, sawing length be 10~10.3m, outside diameter tolerance (- 0.5 ,+2.4) mm, wall thickness deviation be (- 8~+12.5) %, wall thickness
Cross section extreme difference≤2.7mm, design of section of rolling mill are that Φ 382mm, plug are that Φ 334.7mm, winding arbor extraction press pass are Φ 366mm.
The rolling pipe design parameter prepared using the preparation method of the present embodiment is as shown in table 1.
The design parameter for the rolling pipe that the present embodiment preparation method of table 1 is prepared
And the heat treatment performance of the rolling pipe prepared using the preparation method of the present embodiment is as shown in table 2.
The heat treatment performance for the rolling pipe that the present embodiment preparation method of table 2 is prepared
Tube-making process of the invention by studying -100 DEG C of ultralow temperature seamless steel pipes, for service condition and large, medium and small rule
Lattice Research on differences tube-rolling technique, it is ensured that the dimensional accuracy of the seamless steel pipe produced meets ASTM/ASME demand of technical standard, opens
Geometric accuracy is sent, inside and outside surface quality meets petrochemical industry low-temperature pressure container seamless steel pipe, realizes real state
Productionization is studied.
Although reference be made herein to invention has been described for explanatory embodiment of the invention, and above-described embodiment is only this hair
Bright preferably embodiment, embodiments of the present invention are simultaneously not restricted to the described embodiments, it should be appreciated that people in the art
Member can be designed that a lot of other modification and embodiment, and these modifications and embodiment will fall in principle disclosed in the present application
Within scope and spirit.
Claims (4)
1. a kind of production method of -100 DEG C of ultralow temperature seamless steel pipes, its technological process is as follows：
VD continuous casting billets → blank cutting → blank heating → perforation → MPM rolling pipes → hot saw end to end → cooling → aligning → essence
Whole → size and surface quality inspection → packaging and storage；
It is characterized in that：
The blank heating is heated in annular furnace, is protected in its annular furnace in not heat supply section temperature≤780 DEG C, the annular furnace
Hold reducing atmosphere, time of the blank heating is the blank temperature come out of the stove after 320~360min, and the blank heating
For 1235~1255 DEG C；
The perforation needs the hollow billet obtained after control punch straight, and total length external diameter is controlled in 428~432mm；
The MPM rolling pipes are that the plug that temperature is 90~110 DEG C is inserted on the hollow billet of temperature >=1100 DEG C to be rolled
System, and need to control milling train muzzle velocity to be 2.8~3.0m/s in the operation of rolling, the retained speed of plug is 2.4~2.5m/s；
Waste thickness of pipe wall extreme difference≤3.0mm that the MPM rolling pipes are obtained；During the blank heating, sky 6 before and after the blank
~8 rankings are put, and the spacing of blank and blank is 860mm in annular furnace.
2. the production method of -100 DEG C of ultralow temperature seamless steel pipe according to claim 1, it is characterised in that：The blank adds
Heat is divided into preheating section, bringing-up section and soaking zone.
3. the production method of -100 DEG C of ultralow temperature seamless steel pipe according to claim 2, it is characterised in that：The bringing-up section
The rate of heat addition be 10~60 DEG C/h, the rate of heat addition of the soaking zone is 5~5.45 DEG C/h.
4. the production method of -100 DEG C of ultralow temperature seamless steel pipe according to claim 2, it is characterised in that：The preheating section
It is preheating >=90min under conditions of temperature is 565~785 DEG C；The bringing-up section is divided into 1 section of heating, 2 sections of heating, heating 3
Section, 1 section of the heating is to heat 40~50min under conditions of temperature is 1160~1220 DEG C, and 2 sections of the heating is in temperature
Jia 40~50min under conditions of 1230~1240 DEG C, 3 sections of the heating is added under conditions of temperature is 1255~1265 DEG C
40~50min of heat；The soaking zone 110~120min of soaking under conditions of temperature is 1250~1260 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510881339.1A CN105290145B (en) | 2015-12-03 | 2015-12-03 | A kind of production method of 100 DEG C of ultralow temperature seamless steel pipes |
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| CN201510881339.1A CN105290145B (en) | 2015-12-03 | 2015-12-03 | A kind of production method of 100 DEG C of ultralow temperature seamless steel pipes |
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| CN105290145A CN105290145A (en) | 2016-02-03 |
| CN105290145B true CN105290145B (en) | 2017-08-29 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5344062A (en) * | 1993-06-24 | 1994-09-06 | The Idod Trust | Method of forming seamed metal tube |
| CN101444793A (en) * | 2008-12-19 | 2009-06-03 | 攀钢集团成都钢铁有限责任公司 | Method for fabricating seamless steel pipes for large-diameter high-pressure gas cylinders used in trailer production |
| CN102039313A (en) * | 2010-11-03 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing large-diameter seamless steel pipe for gas cylinder |
| CN102861785A (en) * | 2012-09-25 | 2013-01-09 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104438334A (en) * | 2014-09-19 | 2015-03-25 | 衡阳华菱钢管有限公司 | Medium-caliber 9Ni low-temperature seamless steel tube and production method |
-
2015
- 2015-12-03 CN CN201510881339.1A patent/CN105290145B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5344062A (en) * | 1993-06-24 | 1994-09-06 | The Idod Trust | Method of forming seamed metal tube |
| CN101444793A (en) * | 2008-12-19 | 2009-06-03 | 攀钢集团成都钢铁有限责任公司 | Method for fabricating seamless steel pipes for large-diameter high-pressure gas cylinders used in trailer production |
| CN102039313A (en) * | 2010-11-03 | 2011-05-04 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing large-diameter seamless steel pipe for gas cylinder |
| CN102861785A (en) * | 2012-09-25 | 2013-01-09 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104438334A (en) * | 2014-09-19 | 2015-03-25 | 衡阳华菱钢管有限公司 | Medium-caliber 9Ni low-temperature seamless steel tube and production method |
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| CN105290145A (en) | 2016-02-03 |
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