CN104968808A - Manufacturing method and manufacturing equipment for seamless steel pipe or tube with excellent toughness - Google Patents
Manufacturing method and manufacturing equipment for seamless steel pipe or tube with excellent toughness Download PDFInfo
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- CN104968808A CN104968808A CN201480006949.0A CN201480006949A CN104968808A CN 104968808 A CN104968808 A CN 104968808A CN 201480006949 A CN201480006949 A CN 201480006949A CN 104968808 A CN104968808 A CN 104968808A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
With the prior art, it is difficult to reduce material variability caused by a non-uniform micro-structure in the thickness direction of a pipe or tube body and to maintain the productivity of an entire thermal treatment line at the same time. Whether or not a pipe or tube body is of a steel grade having an Ms point of lower than 200 DEG C is determined in advance, and after quenching, a pipe or tube body that is found to have the abovementioned steel grade in the determination results is separately detained in a room-temperature environment (preferably, transferred and detained on a detainment floor (6)) until the temperature difference between the highest-temperature part and the lowest-temperature part in a cross-section orthogonal to the pipe/tube axis becomes smaller than 2.0 DEG C, and the pipe or tube body is then subjected to a tempering treatment. In contrast, a pipe or tube body that is found not to have the abovementioned steel grade in the determination results is subjected to tempering treatment without being detained.
Description
Technical field
The present invention relates to manufacture method and the producing apparatus of the excellent weldless steel tube (seamless steel pipeor tube) of toughness (toughness).This manufacture method and producing apparatus particularly use to obtain the product pipe of tenacity excellent as the Q-tempering process (quenching and tempering) of modifier treatment (thermal refining) to implement the body being the manufacture work in-process (intermediates (semimanufacturedproduct)) of the weldless steel tube of the steel grade of low temperature as Ms point as stainless steel (stainless steel) (=martensite start temperature (martensitic transformation start temperature)) and Mf point (=martensitic transformation finishing temperature (martensitic transformation finish temperature)).
Refer at this said " tenacity excellent " and such as meet iso standard 13680.That is, refer to that the absorption energy (absorbed energy) at test temperature=-10 that measured by the pipe circumferential direction (C direction, transverse test piece) Charpy impact test (Charpy impact test) in the wall thickness central portion (central part of wall thickness) of product pipe DEG C (is denoted as: vE
-10) meet: in the mean value of 3 test films, average absorption energy is more than 40J, and the experiment slice absorbing energy shortage 40J is in 3 test films less than 1 and its endergonic value is more than 27J (more than 2/3 of required value 40J).
Background technology
As the prior art of the manufacture about weldless steel tube, enumerate following technology.
Patent Document 1 discloses following technology: when the stainless weldless steel tube of manufacture heavy wall 13Cr system, by Heating temperature during regulation quenching heat treatment and speed of cooling, obtain the product of high strength and high tenacity.
Patent Document 2 discloses and be reduced to minimal equipment for what make production efficiency (productive efficiency) when processing the steel grade of the speed of cooling that cannot increase quenching.But, about heat treated order itself, as long as no fault (trouble) be exactly Xian Ru ? first go out (first in, first out).
Patent Document 3 discloses the manufacture method of the weldless steel tube of Ma Shi body ?ferrite dual phase steel.
Patent Document 4 discloses following technology: in the quenching method making hardening liquid (quenching liquid) circulate along a direction in pipe inner face side, liquid temperature measured value based on inflow side and outflow side controls the flow of hardening liquid, reduces the hardness deviation on the length direction of the pipe after quenching thus.
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2008-189945 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2009-242863 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2005-336595 publication
Patent documentation 4: Japanese Unexamined Patent Publication 2001-032022 publication
Summary of the invention
The problem that invention will solve
The half-finished body of manufacture about the weldless steel tube as steel grades such as martensitic stainless steels, after being regulation shape (predetermined size) by hot-work (hot working) tube rolling (tube rolling), by implementing the thermal treatment of Q-tempering, control as required intensity and toughness levels.Following operation is taked in common thermal treatment: first, in quench treatment, above-mentioned tubular body is being heated to A in process furnace (heating furnace)
c1the above A of point
c3after the temperature that point is following, be cooled to close to room temperature rapidly by water-cooled etc., in ensuing temper, above-mentioned cooled body be rapidly heated to A in other process furnace
c1cooling (such as with reference to patent documentation 1) is placed after the temperature that point is following.Recently, carry out so heat treated equipment and be continuously produced linearize (continuously linable), set the treatment condition such as Heating temperature and heat-up time separately for various range of product.
The steel grades such as martensitic stainless steel (with reference to patent documentation 1) or Ma Shi body ?ferrite dual phase steel (with reference to patent documentation 3) obtain the martensitic phase of desired amount (desired arearatio) by above-mentioned Q-tempering.At this, Ms point and Mf point have a great difference according to the steel composition determining steel grade, wherein also exist Ms point lower than 100 DEG C, Mf point is lower than the steel grade of room temperature.The temperature of the body after quenching is confirmed by the measurement of surface temperature usually.About the steel grade of low Ms point as described above and low Mf point, the surface of body and temperature head (uneven temperature in=wall thickness direction distributes) impact on martensitic phase variability (martensitictransformation ratio) of wall thickness inside cannot be ignored.Namely, even if the surface temperature of the body after quenching is close to room temperature, if just entered into tempering before the temperature distribution (temperature distribution) of wall thickness direction (wall thickness direction) reaches uniform steady state (steady state), then can produce the tissue distribution of non-original idea, this can become a reason of the material deviation (material variability) (deviation of=mechanical property (mechanicalproperty), especially toughness) after producing modifier treatment.
On the other hand, the steel grade of the martensitic phase expected is obtained (conveniently by above-mentioned Q-tempering about wanting, be called specific steel grade (specific steel grade)), even if because the speed of cooling after Quench heating (heating in=quench treatment) is place the such low speed of cooling martensitic transformation of cooling itself also can produce, if therefore continue after cooling to room temperature at room temperature to place the sufficient time, then can reduce above-mentioned material deviation.But, if first go out the thermal treatment that (such as with reference to patent documentation 2) implements specific steel grade and different steel grades in addition in identical heat-treatment production line first to enter ?, then there is specific steel grade needs this situation of specified time more than to become obstacle thus makes the problem that the productivity of heat-treatment production line entirety reduces storage period at room temperature.
As a result, in the past, the known flow control by hardening liquid (flow control) reduces quenching method and the equipment (such as with reference to patent documentation 4) of the hardness deviation on the length direction of body.But, following problem is there is: namely, the material deviation that uneven (non-uniformmicrostructure) that be difficult to realize the tissue reduced on the body wall thickness direction of Yin Teding steel grade causes simultaneously and the productivity maintaining heat-treatment production line entirety in the thermal treatment specific steel grade and different steel grade undertaken by identical heat-treatment production line as described above.
For solving the means of problem
Present inventor has carried out studying with keen determination to solve above-mentioned problem, it found that, if differentiate that body is that Ms point is lower than the steel grade of 200 DEG C or steel grade in addition, and after the former water-cooled in quenching separately under room temperature environment indwelling until in tube axis direction orthogonal cross-sections the highest temperature portion in (wall thickness direction) and the temperature head in lowest temperature portion become lower than 2.0 DEG C, then above-mentioned material deviation significantly reduces, and the mean value (vE of data in the deviation range of above-mentioned material
-10mean value) also improve.It should be noted that, as long as the latter carries out common Q-tempering.The present invention completes based on these opinions, and its purport is as described below.
(1) a kind of manufacture method of weldless steel tube, there is the operation half-finished body of manufacture as weldless steel tube being implemented to Q-tempering process, the feature of the manufacture method of described weldless steel tube is, differentiate that whether body is Ms point lower than the steel grade of 200 DEG C in advance, after described quenching, the body that described differentiation result is yes indwelling under room temperature environment separately, until the temperature head in highest temperature portion in the tubular axis line orthogonal cross-sections of this body and lowest temperature portion becomes lower than 2.0 DEG C, afterwards, fed to described temper, on the other hand, the body that described differentiation result is no does not carry out described indwelling and feeds to described temper.
(2) a kind of producing apparatus of weldless steel tube, comprise the equipment half-finished body of manufacture as weldless steel tube being implemented to Q-tempering process, the feature of the producing apparatus of described weldless steel tube is, possess: mechanism for identifying, it differentiates that whether body is Ms point lower than the steel grade of 200 DEG C in advance; And indwelling bed, it is for before feeding to described tempering, by the indwelling under room temperature environment separately of described body, until the difference in highest temperature portion in the tubular axis line orthogonal cross-sections of this body and lowest temperature portion becomes lower than 2.0 DEG C.
Invention effect
According to the present invention, Ms point lower than 200 DEG C steel grade after quenching before tempering separately under room temperature environment indwelling until wall thickness direction temperature distribution full and uniformization thus become the product pipe of the little tenacity excellent of material deviation, in addition steel grade not by above-mentioned indwelling hinder ground as usual with Xian Ru ? first go out to heat-treat, therefore, it is possible to manufacture the weldless steel tube of tenacity excellent while the productivity maintaining heat-treatment production line entirety.
Accompanying drawing explanation
Fig. 1 is the floor map of the example representing the heat-treatment production line used in the present invention.
Embodiment
Fig. 1 is the floor map of the example representing the heat-treatment production line used in the present invention.Manufacturing in half-finished body 1 as weldless steel tube, be determined as Ms point be the body of more than 200 DEG C (conveniently, also referred to as A pipe) in quenching heating furnace 2, be heated to the appropriate Heating temperature different according to steel grade after, to impregnated in the water coolant in quenching tank (quenchingwater tank) 3 water-cooled until the periphery temperature of body is reduced to close to room temperature.Afterwards, via on cooling bed (cooling bed) 4, in tempering process furnace (heatingfurnace for tempering) 5, carry out tempering with the appropriate tempering temperature different according to steel grade.It should be noted that, Ms point is obtained by utilizing the calculating of aftermentioned formula (1).
On the other hand, be determined as Ms point be processed to manage identical path with A until arriving till cooling bed 4 lower than the body (conveniently, also referred to as B pipe) of 200 DEG C.But, only B pipe is shifted from cooling bed 4 to the indwelling bed (also referred to as alignment buffer (buffer line)) 6 as other paths different from the path of A pipe, and on this alignment buffer 6 under room temperature environment indwelling until the temperature head (being denoted as Δ T) in highest temperature portion in tube axis direction orthogonal cross-sections and lowest temperature portion becomes lower than 2.0 DEG C.Make it return cooling bed 4 afterwards, utilization is later managed identical path with A and is carried out tempering.
It should be noted that, in the present invention, make cooling bed 4 and indwelling bed 6 be equipment independently.If the space of cooling bed 4 has vacant, also its part can be used as indwelling bed.
In the present invention, aforesaid specific steel grade (wanting the steel grade of the martensitic phase being obtained desired amount by Q-tempering) is such as following composition: in mass %, containing C:0.005 ~ 0.05%, Si:0.05 ~ 1.0%, Mn:0.2 ~ 1.8%, below P:0.03%, below S:0.005%, Cr:11 ~ 20%, Ni:1.5 ~ 10%, Mo:1 ~ 5%, below N:0.15%, and remainder is Fe and inevitable impurity.In addition, also can be following composition: in above-mentioned composition, replace Fe a part and in mass % containing from Al:0.002 ~ 0.05%, below Cu:3.5%, below Nb:0.5%, below V:0.5%, below Ti:0.3%, below Zr:0.2%, below W:3%, below B:0.01%, below Ca:0.01%, below REM:0.01% selection 1 in or two or more.
As previously mentioned, in the steel grade (it is the one in above-mentioned specific steel grade) that Mf point is such lower than room temperature, the temperature distribution (temperature distribution in tubular axis line orthogonal cross-sections) in the wall thickness direction of body time in fact by tempering decides martensitic phase variability, the in other words remained austenite content (amount of residual austenite) of the position in this wall thickness direction.In such temperature distribution, even if the temperature head Δ T in the highest temperature portion of the temperature distribution in the wall thickness direction of body and lowest temperature portion is lower than 10 DEG C, the difference (deviation) of the remained austenite content that the position, wall thickness direction because of body causes also becomes the degree that cannot ignore.The deviation of this remained austenite content becomes a reason of the material deviation producing product.
On the other hand, in the present invention, by B pipe under room temperature environment indwelling until Δ T becomes lower than 2.0 DEG C.Thereby, it is possible to obtain following effect: the deviation of the remained austenite content in body wall thickness direction when tempering starts significantly reduces, and the material deviation of the product after tempering significantly reduces, and the mean value (vE of data in this material deviation range
-10mean value) improve.If started tempering before Δ T is reduced to lower than 2.0 DEG C, then cannot obtain such effect.In addition, the criterion of B pipe being set to Ms point lower than 200 DEG C is experimental studies results based on following present inventor: even if be considered as this criterion with Mf point roughly of equal value lower than room temperature, also no problem in practical application.
In the present embodiment, Ms point uses following formula (1) to calculate, this formula (1) obtains as follows, namely, the experimental data of Ms point is gathered from the thermal dilatometry (thermalexpansion curve) measured in advance by continuous cooling transformation experiment (continuouscooling transformation experiment) of the thermal expansion test sheet (thermal expansion test piece) employing various composition about above-mentioned specific steel grade, in moiety amount [quality %], regression analysis (regression analysis) is carried out to this experimental data, obtain formula (1) thus.
Ms[℃]＝502－810[％C]－1230[％N]－13[％Mn]－30[％Ni]－12[％Cr]－54[％Cu]－6[％Mo] …(1)
It should be noted that, in formula (1), [%M] is the component amount of each component element M.In addition, its component element item is brought into by 0 when there is the component element do not contained in steel.
As concrete preferred enforcement means, to enter the setting of heat treated each steel grade from quenching terminate (water-cooled terminates) to tempering standbyly need the time (waiting time) (setup time (lead time)).When carrying out this setting, preferably, prior grasp based on the Ms point of above-mentioned formula (1), and prepares the setup time calculation means (calculation device) that the measurement of the surface temperature of envrionment temperature (ambient temperature) and body and Calculation of Heat Transfer combined.In the body (above-mentioned B pipe) of Ms point lower than the steel grade of 200 DEG C, by common Xian Ru ? first go out the setup time of mode on cooling bed 4 and do not arrive until become the body of the equalizing temperature required time of Δ T < 2.0 DEG C, temporarily transfer to alignment buffer 6, under room temperature environment, carry out indwelling until become Δ T < 2.0, again feed to temper.
Embodiment
By hot-work, tubulation is carried out to the steel billet (steel billet) with the Ms point that the chemical constitution shown in table 1 and through type (1) calculate, after this tubulation, air cooling to 100 DEG C ~ room temperature, makes 10 bodys becoming the raw material of weldless steel tube of external diameter 195.0mm × wall thickness 27.0mm.
As the present invention's example, following thermal treatment (quenching-tempering) is carried out to 5 (P1 ~ P5) of the random extraction (random sampling) in above-mentioned tubular body.Heat-treatment production line uses the production line shown in Fig. 1.Quenching for carrying out the process of water-cooled after being heated to 950 DEG C.The surface temperature (measured value) of the body of (recuperation) finish time of re-heat after water-cooled is 30 ~ 36 DEG C.By at room temperature (in the air) indwelling more than 8 hours of this body, to be loaded in tempering process furnace in the moment that Δ T (calculated value) becomes 1.2 ~ 1.8 DEG C and carried out tempering at 600 DEG C.
As comparative example, for remaining 5 bodys (P6 ~ P10), after carrying out the quenching under the condition identical with the present invention's example, do not carry out the time management (time management) based on Δ T < 2.0 DEG C, but according to common Xian Ru ? first go out mode and load tempering process furnace, and carry out tempering at 600 DEG C.In this situation, the Δ T (calculated value) when loading to tempering process furnace is 6.0 DEG C.
From each body after temper, according to the regulation of JIS Z 2202,3 V-notch test films (wall thickness central portion of collection position=pipe is respectively gathered to each body, test film thickness=10mm, test film length direction=pipe circumferential direction (C direction), V-notch depth direction=pipe range direction (L direction)) (S1, S2, S3), carry out Charpy impact test according to the regulation of JIS Z 2242 and obtain vE
-10.
The result obtained is as shown in table 2.According to table 2, in example of the present invention, vE
-10mean value=the 87.7J of value (N number=15), does not have the test film less than 40J.In addition, the very little result of this deviation of standard deviation=3.8J is obtained.On the other hand, in a comparative example, vE
- 10mean value=the 81.7J of value (N number=15).But, have 2 less than the test film of 40J.In addition, in a comparative example, the reduction of standard deviation=17.9J and mean value and the expansion of deviation is confirmed.Carry out observations by every root body, in a comparative example, exist and obtain and the vE of the present invention's example with degree
-10the body of value.On the other hand, vE is confirmed
-10the body that value significantly reduces, this can cause the reduction of mean value and the expansion of deviation.
Like this, stable mechanical property can be obtained according to the present invention.
[table 1]
[table 2]
Description of reference numerals
1 body
2 quenching heating furnaces
3 quenching tanks
4 is cooling bed
5 tempering process furnace
6 indwelling beds (alignment buffer)
Claims (2)
1. the manufacture method of a weldless steel tube, there is the operation half-finished body of manufacture as weldless steel tube being implemented to Q-tempering process, the feature of the manufacture method of described weldless steel tube is, differentiate that whether body is Ms point lower than the steel grade of 200 DEG C in advance, after described quenching, the body that described differentiation result is yes indwelling under room temperature environment separately, until the temperature head in highest temperature portion in the tubular axis line orthogonal cross-sections of this body and lowest temperature portion becomes lower than 2.0 DEG C, afterwards, fed to described temper, on the other hand, the body that described differentiation result is no does not carry out described indwelling and feeds to described temper.
2. the producing apparatus of a weldless steel tube, comprise the equipment half-finished body of manufacture as weldless steel tube being implemented to Q-tempering process, the feature of the producing apparatus of described weldless steel tube is to possess: mechanism for identifying, and it differentiates that whether body is Ms point lower than the steel grade of 200 DEG C in advance; And indwelling bed, it is for before feeding to described tempering, by the indwelling under room temperature environment separately of described body, until the difference in highest temperature portion in the tubular axis line orthogonal cross-sections of this body and lowest temperature portion becomes lower than 2.0 DEG C.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013016459A JP5907083B2 (en) | 2013-01-31 | 2013-01-31 | Manufacturing method and equipment for seamless steel pipe with excellent toughness |
| JP2013-016459 | 2013-01-31 | ||
| PCT/JP2014/000297 WO2014119251A1 (en) | 2013-01-31 | 2014-01-22 | Manufacturing method and manufacturing equipment for seamless steel pipe or tube with excellent toughness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104968808A true CN104968808A (en) | 2015-10-07 |
| CN104968808B CN104968808B (en) | 2017-11-17 |
Family
ID=51261968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480006949.0A Active CN104968808B (en) | 2013-01-31 | 2014-01-22 | The manufacture method and manufacturing equipment of the seamless steel pipe of tenacity excellent |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20150368734A1 (en) |
| EP (1) | EP2952592B1 (en) |
| JP (1) | JP5907083B2 (en) |
| CN (1) | CN104968808B (en) |
| WO (1) | WO2014119251A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110484814A (en) * | 2019-08-05 | 2019-11-22 | 中国科学院金属研究所 | A kind of high strength steel seamless pipe and preparation method thereof of aerospace containing rare earth |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2017009205A (en) | 2015-01-15 | 2017-11-17 | Jfe Steel Corp | Seamless stainless steel pipe for oil well, and method for manufacturing same. |
| WO2017122405A1 (en) | 2016-01-13 | 2017-07-20 | 新日鐵住金株式会社 | Method for manufacturing stainless steel pipe for oil wells and stainless steel pipe for oil wells |
| CN111304429B (en) * | 2020-04-01 | 2021-08-27 | 益大特钢有限公司 | Heat treatment equipment for processing seamless steel pipe |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2952592A4 (en) | 2016-04-27 |
| JP2014148699A (en) | 2014-08-21 |
| EP2952592B1 (en) | 2019-06-12 |
| CN104968808B (en) | 2017-11-17 |
| WO2014119251A1 (en) | 2014-08-07 |
| US20150368734A1 (en) | 2015-12-24 |
| EP2952592A1 (en) | 2015-12-09 |
| JP5907083B2 (en) | 2016-04-20 |
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