CN105537315B - A kind of production method of liquefied natural gas low temperature seamless steel pipe - Google Patents
A kind of production method of liquefied natural gas low temperature seamless steel pipe Download PDFInfo
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- CN105537315B CN105537315B CN201510881279.3A CN201510881279A CN105537315B CN 105537315 B CN105537315 B CN 105537315B CN 201510881279 A CN201510881279 A CN 201510881279A CN 105537315 B CN105537315 B CN 105537315B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 53
- 239000010959 steel Substances 0.000 title claims abstract description 53
- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 238000010438 heat treatment Methods 0.000 claims abstract description 55
- 238000005096 rolling process Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 238000007689 inspection Methods 0.000 claims abstract description 4
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims abstract description 3
- 238000002791 soaking Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 13
- 238000003801 milling Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 7
- 238000009785 tube rolling Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 9
- 229910052759 nickel Inorganic materials 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 241000208340 Araliaceae Species 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
Abstract
The invention discloses a kind of production method of liquefied natural gas with low temperature seamless steel pipe.A kind of production method of liquefied natural gas low temperature seamless steel pipe, its technological process is as follows：VD continuous casting billets → blank excision → blank heating → perforation → continuous rolling-tube unit rolling pipe → hot saw end to end → cooling → aligning → finishing → size and surface quality inspection → packaging and storage；Tube-making process of the invention by studying Gr.8 cryotronls, for service condition 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 LNG seamless steel pipes, realizes that LNG is really domesticized research with seamless steel pipe.
Description
Technical field
The present invention relates to ultralow temperature seamless steel pipe field, and in particular to a kind of life of liquefied natural gas low temperature seamless steel pipe
Production method.
Background technology
With China's rapid development of economy, domestic petroleum, chemical industry equal energy source industry need a large amount of cryogenic steel to manufacture
Various liquefied petroleum gas, liquefied ammonia, liquid oxygen, the production of liquid nitrogen and storage device.Due to liquefied natural gas have it is flammable and ultralow
Warm nature, compared with general low-temperature pressure container, it is stored and transport steel pipe must possess intensity, thermal stress and strain, welding
Performance and the overall characteristic such as anticorrosive, also require that material has anti-brittle crack scalability, to the metallurgical quality and heat of steel pipe
Handling process requires extremely strict.Planned according to China " 12 ", the coming five years will optimize the development of fossil energy, accelerate oil
The exploitation of gas resource.This is by production of energy under low temperature service condition and the wide market of storage device manufacturing offer and hair
Opportunity is opened up, while can also promote the development of low temperature material.The material used under the conditions of current energy industry -70~-196 DEG C is more
For Ni systems low-temperature steel, Ni contents are between 0.5%~9%.With the increase of Ni contents, the smelting and rolling difficulty increase of steel.
At present, although existing enterprise of the country can produce the high Ni steel such as 3.5%Ni and 9%Ni, but the performance of product is stablized not enough, no
The accreditation of user can be obtained completely.
9%Ni steel (it is Gr.8 that steel pipe, which represents the trade mark as ASTM A333) be nineteen forty-four exploitation Ni contents as 9% alloy
Steel, by the product research laboratory development success of International nickel Co. Ltd. Inco. Ltd. of the U.S., it is a kind of low-carbon quenched and tempered steel, is organized as martensite and adds
Bainite.This steel under extremely low temperature have good toughness and high intensity, and with austenitic stainless steel and aluminium alloy
Compare, coefficient of thermal expansion is small, good economy performance, minimum reachable -196 DEG C of temperature in use, had shown that from nineteen sixty by research without weldering
Since hidden lino removal can also be used safely afterwards, 9%Ni steel just turn into be used for manufacture Large LNG storage tank main material it
One.Meanwhile, it is following domestic to storing liquefied natural gas (LNG) terminal structure material with the variation of global energy resource
Demand will be very big, develops the material of corresponding construction by one of important step adjusted as energy strategy.LNG temperature
For -162 DEG C, some strength and toughness must be had under extremely low temperature by storing its structural material.Current ultra low temperature material
Material mainly has following several：(it is ASTM A333 that steel pipe, which represents the trade mark, for austenitic stainless steel, nickel-base alloy, aluminium alloy and 9Ni steel
For Gr.8).Compared with austenitic stainless steel and austenite Fe-Ni alloy, 9Ni steel costs are lower, with aluminium alloy ratio, 9Ni steel tool
There is higher intensity and more preferable low-temperature flexibility, therefore the structural material of LNG storages and transporting equipment generally uses 9Ni in the world
Steel, current 9Ni steel is also domestic alleviation Pressure on Energy, builds the necessary important foundation raw material of liquefied natural gas.
Domestic Anshan iron and steel plant, titanium steel, Nangang can produce 9Ni steel plates, but forging, pipe fitting and the wlding that shortage is matched with steel plate,
Therefore the 9Ni steel cryotronls of import are currently mainly used.With continuing to develop for LNG industries, LNG storage tank, LNG ship build and
Relevant industries, add to sharp increase severely of demand of 9Ni Steel materials；Also there is the demand of 9Ni steel in the device fabrication of petrochemical industry project.Mesh
Before, domestic correlation manufacturing enterprise has carried out substantial amounts of research for applicable cases of the 9Ni Steel materials in the construction of Large LNG storage tank
Improved with production technology, have accumulated rich experience, but welding bead track and reponse system in terms of research not yet start to walk, especially
It is the PRODUCTION TRAITS in seamless steel pipe.
The content of the invention
[technical problem to be solved]
Present invention aim to address above-mentioned prior art problem, there is provided a kind of liquefied natural gas low temperature seamless steel pipe
Production method.This method is Φ 273mm, outer diameter tolerance (- 0.8 ,+2.4) mm mainly for external diameter；15~20mm of wall thickness, wall thickness
Tolerance is ± 12.5% liquefied natural gas (LNG) 9Ni steel low temperature seamless steel pipes.The liquefied natural gas of this method production
(LNG) low temperature seamless steel pipe dimensional accuracy is used, inside and outside surface quality meets ASME/ASTM demand of technical standard.
[technical scheme]
In order to reach above-mentioned technique effect, the present invention takes following technical scheme：
A kind of production method of liquefied natural gas low temperature seamless steel pipe, its technological process is as follows：
VD continuous casting billets → blank cutting → blank heating → perforation → continuous rolling-tube unit rolling pipe → hot saw end to end → it is cold
But → aligning → finishing → size and surface quality inspection → packaging and storage；
The blank heating is heated in annular furnace, not heat supply section temperature≤790 DEG C, the annular furnace in its annular furnace
Middle holding reducing atmosphere, time >=6.5h of the blank heating, and the blank temperature come out of the stove after the blank heating are
1245~1265 DEG C；
The perforation needs the hollow billet obtained after control punch straight, and total length external diameter is controlled in 336~340mm；
The rolling pipe is that the plug that temperature is 90~110 DEG C is inserted on the hollow billet of temperature >=1080 DEG C to be rolled
System, and it is 2.8~3.3m/s to need control milling train muzzle velocity in the operation of rolling, the retained speed of plug is 2.48~
2.635m/s；Waste thickness of pipe wall extreme difference≤2.8mm that the rolling pipe is obtained.
According to the present invention further technical scheme, during the blank heating, the blank with before and after blank
The ranking of sky 5~7 is put, and the spacing of blank and blank is 800mm 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 20 DEG C~36 DEG C/h, described
The rate of heat addition of soaking zone is 3.5 DEG C~5 DEG C/h.According to the present invention further technical scheme, the preheating section is in temperature
Spend for preheating >=100min under conditions of 580~795 DEG C；The bringing-up section is divided into 1 section of heating, 2 sections of heating, 3 sections of heating, described
Heating 1 section be temperature be 1165~1225 DEG C under conditions of heating >=60min, 2 sections of the heating be temperature be 1235~
Heating >=60min under conditions of 1245 DEG C, 3 sections of the heating be temperature be 1265~1275 DEG C under conditions of heating >=
60min；The soaking zone is divided into 2 sections of 1 section of soaking and soaking, and 1 section of the soaking is in the condition that temperature is 1255~1265 DEG C
Lower heating >=60min, 2 sections of the soaking is heating >=40min under conditions of temperature is 1250~1260 DEG C.
According to the present invention further technical scheme, during the rolling pipe, the plug is in position to be worn
Temperature is at 90 DEG C~110 DEG C.
According to the present invention further technical scheme, during the rolling pipe, the milling train muzzle velocity need to be controlled to be
3.0m/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 5~7 before and after blank, and the blank in annular furnace
Be 800mm 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≤1235 DEG C, reduction furnace temperature stops rolling more than 60min to temperature≤1225 DEG C when stopping rolling more than 40min
When reduction furnace temperature to 1155 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 6.5h, its
Steel billet tissue is unable to complete austenitizing；But, if total heat time is too high, autstenitic grain size can be caused thick, it is above-mentioned
Two kinds of situations are to low-temperature impact, and especially -196 DEG C low-temperature impact influences are very big.
According to different production specifications, corresponding perforating head size is matched, capillary outer diameter is controlled in 336~340mm,
Ask perforation after hollow billet it is visually straight, total length external diameter is in the same size.
During limiting mandrel tandem rolling pipe machine rolling pipe is carried out, hollow billet is enclosed on the long plug by lubrication, sent
Enter and carry out continuously subtracting wall extensional in continuous rolling-tube unit.The waste thickness of pipe wall extreme difference obtained after rolling is controlled≤2.8mm's
In the range of, it is because the hollow forging geometric accuracy that the unit is produced directly influences the geometric accuracy of fished pipe.And
And when carrying out rolling pipe, 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.Ensuring hollow billet start rolling temperature must not be less than 1080 DEG C, plug temperature requirement
100 ± 10 DEG C, ensure that the hollow forging geometric accuracy of the Rolling Production meets the requirements, further ensure that fished pipe
Physical dimension.
[beneficial effect]
The present invention compared with prior art, with following beneficial effect：
Liquefied natural gas (LNG) produced by the invention uses low temperature seamless steel pipe physical dimension, and inside and outside surface quality is completely full
Enough and 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 liquefied natural gas (LNG) low temperature seamless steel pipe.
Embodiment
With reference to embodiments of the invention, the invention will be further elaborated.
Embodiment：
The present embodiment mainly prepares external diameter for Φ 273mm, external diameter allowable tolerance (- 0.8 ,+2.4) mm；Wall thickness 15mm, wall thickness
Allowable tolerance is ± 12.5%, and length >=6mm, ovality is less than or equal to 1.5%, and eccentricity≤2.8mm liquefaction is natural
Gas (LNG) Cr.8 steel low temperature seamless steel pipes.
Technological process is as follows：
Φ 280mmVD continuous casting billets → blank excision → blank heating → perforation → 340mmMPM continuous rolling-tube unit rolling pipes
→ hot saw end to end → cooling → aligning → finishing → size and surface quality inspection → packaging and storage；
Wherein, the blank heating is divided into preheating section, bringing-up section and soaking zone.The preheating section be temperature be 580~
Preheating >=100min under conditions of 795 DEG C；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
Heating >=60min under conditions of temperature is 1165~1225 DEG C, 2 sections of the heating is in the bar that temperature is 1235~1245 DEG C
Heating >=60min under part, 3 sections of the heating is heating >=60min under conditions of temperature is 1265~1275 DEG C；The soaking
Section is divided into 2 sections of 1 section of soaking and soaking, and 1 section of the soaking is heating >=60min under conditions of temperature is 1255~1265 DEG C,
2 sections of the soaking is heating >=40min under conditions of temperature is 1250~1260 DEG C.
The perforation have selected following technique ginseng according to the production specification of the liquefied natural gas low temperature seamless steel pipe of preparation
Number：Capillary outer diameter is Φ 336mm, and entrance guide internal diameter is 300mm, and godet width is 238mm, comes directly towards a diameter of 269mm, top
Length is 575mm, a diameter of 255mm of push rod, and it is 278mm to take off pipe ring internal diameter.
The continuous rolling-tube unit pass and size Control of the 340mmMPM rolling pipes are as follows：Specification be Φ 273mm ×
After 15mm, sawing length be 10~10.5m, 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 283mm, plug are that Φ 263.7mm, winding arbor extraction press pass are Φ 281mm.
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 Gr.8 cryotronls, is studied for service condition and large, medium and small size heterogeneity
Tube-rolling technique, it is ensured that the dimensional accuracy of the seamless steel pipe produced meets ASTM/ASME demand of technical standard, develops dimensioning
Very little precision, inside and outside surface quality meets LNG seamless steel pipes, realizes that LNG is really domesticized research with seamless steel pipe.
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 (5)
1. a kind of liquefied natural gas production method of low temperature seamless steel pipe, its technological process is as follows：
VD continuous casting billets → blank cutting → blank heating → perforation → continuous rolling-tube unit rolling pipe → hot saw end to end → cooling →
Aligning → finishing → 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≤790 DEG C, the annular furnace
It is 1245 to hold reducing atmosphere, time >=6.5h of the blank heating, and the blank temperature come out of the stove after the blank heating
~1265 DEG C；
The perforation needs the hollow billet obtained after control punch straight, and total length external diameter is controlled in 336~340mm；
The rolling pipe is that the plug that temperature is 90~110 DEG C is inserted on the hollow billet of temperature >=1080 DEG C to be rolled,
And need to control milling train muzzle velocity to be 2.8~3.3m/s in the operation of rolling, the retained speed of plug is 2.48~2.635m/s；
Waste thickness of pipe wall extreme difference≤3.0mm that the rolling pipe is obtained；
During the blank heating, the ranking of sky 5~7 is put before and after the blank, and blank and blank in annular furnace
Spacing is 800mm.
2. the liquefied natural gas according to claim 1 production method of low temperature seamless steel pipe, it is characterised in that：The base
Material heating is divided into preheating section, bringing-up section and soaking zone.
3. the liquefied natural gas according to claim 2 production method of low temperature seamless steel pipe, it is characterised in that：It is described to add
The rate of heat addition of hot arc is 20 DEG C~36 DEG C/h, and the rate of heat addition of the soaking zone is 3.5 DEG C~5 DEG C/h.
4. the liquefied natural gas according to claim 2 production method of low temperature seamless steel pipe, it is characterised in that：It is described pre-
Hot arc is preheating >=100min under conditions of temperature is 580~795 DEG C；The bringing-up section is divided into 1 section of heating, 2 sections of heating, added
3 sections of heat, 1 section of the heating is heating >=60min under conditions of temperature is 1165~1225 DEG C, and 2 sections of the heating is in temperature
Spend for heating >=60min under conditions of 1235~1245 DEG C, it in temperature is under conditions of 1265~1275 DEG C that 3 sections of the heating, which is,
Heating >=60min；The soaking zone is divided into 2 sections of 1 section of soaking and soaking, and it in temperature is 1255~1265 DEG C that 1 section of the soaking, which is,
Under conditions of heating >=60min, 2 sections of the soaking be temperature be 1250~1260 DEG C under conditions of heating >=40min.
5. the liquefied natural gas according to claim 1 production method of low temperature seamless steel pipe, it is characterised in that：It is described to roll
During tubulation base, it is 3.0m/s that need to control milling train muzzle velocity.
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| CN201510881279.3A CN105537315B (en) | 2015-12-03 | 2015-12-03 | A kind of production method of liquefied natural gas low temperature seamless steel pipe |
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| CN201510881279.3A CN105537315B (en) | 2015-12-03 | 2015-12-03 | A kind of production method of liquefied natural gas low temperature seamless steel pipe |
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| CN110814039A (en) * | 2019-12-27 | 2020-02-21 | 临清市东华轴承钢管有限责任公司 | Method for producing small-caliber bearing steel pipe |
| CN111589870B (en) * | 2020-04-03 | 2022-04-15 | 包头钢铁（集团）有限责任公司 | Method for producing rare earth bearing seamless steel pipe by adopting phi 200mm round pipe blank |
| CN113172116B (en) * | 2021-04-25 | 2023-08-01 | 衡阳华菱连轧管有限公司 | Preparation method of seamless steel tube, seamless steel tube and drill rod structure |
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| US5344062A (en) * | 1993-06-24 | 1994-09-06 | The Idod Trust | Method of forming seamed metal tube |
| CN101444793B (en) * | 2008-12-19 | 2010-12-29 | 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 |
| CN102039313B (en) * | 2010-11-03 | 2013-11-06 | 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 |
| CN102861785B (en) * | 2012-09-25 | 2015-04-15 | 攀钢集团成都钢钒有限公司 | Nuclear power-used low-temperature seamless steel tube and production method therefore |
| CN104438334B (en) * | 2014-09-19 | 2016-11-23 | 衡阳华菱钢管有限公司 | Medium caliber 9Ni low temperature seamless steel pipe and production method |
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