CN103459619B - Method for winding hot-rolled maraging steel strip - Google Patents
Method for winding hot-rolled maraging steel strip Download PDFInfo
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- CN103459619B CN103459619B CN201280014083.9A CN201280014083A CN103459619B CN 103459619 B CN103459619 B CN 103459619B CN 201280014083 A CN201280014083 A CN 201280014083A CN 103459619 B CN103459619 B CN 103459619B
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
-
- 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
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/26—Special arrangements with regard to simultaneous or subsequent treatment of the material
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
A method for winding a hot-rolled maraging steel strip is provided with which it is possible to inhibit a hot-rolled coil from suffering a local increase in hardness. The method for winding a hot-rolled maraging steel strip comprises heating a raw material for maraging steel to 1,050-1,300 C, subsequently hot-rolling the raw material to obtain a maraging steel strip, and then winding the maraging steel strip into a coil, wherein the temperature of the maraging steel coil obtained by winding the maraging steel strip is kept at a temperature above the Ms point throughout the whole length of the maraging steel strip and, once the maraging steel coil has cooled to or below the Ms point, the maraging steel coil is prevented from heating up again to a temperature above the Ms point.
Description
Technical field
The present invention relates to a kind of method for winding of hot rolling Maraging steel strip.
Background technology
Because maraging steel has the very high tensile strength of about 2000MPa, be therefore applied to the component requiring high strength.Wherein, such as, the maraging steel that the stepless speed changer part etc. of motor car engine uses is steel band by hot rolling, then, by the cold rolling thin plate being processed as about 0.5mm.
As the hot-rolling method of above-mentioned maraging steel, such as, a kind of manufacture method of martensitic aging cold-rolled steel sheet is disclosed in Japanese Laid-Open Patent Publication 60-234920 publication (patent documentation 1), the accumulation draft of steel below 1000 DEG C is set to less than 60% and the accumulation draft of steel below 950 DEG C is set to less than 20% by the manufacture method of this martensitic aging cold-rolled steel sheet, hot rolling is completed at temperature more than 900 DEG C, reel at the temperature of 300 DEG C ~ 600 DEG C, then after cold rolling, recrystallization annealing and solution heat treatment is carried out, above-mentioned steel contains C≤0.02%, Si≤0.1%, Mn≤0.2%, P≤0.01%, S≤0.01%, N≤0.01% and containing Ni15% ~ 25%, Co≤10.0%, Mo≤7.0%, Al≤0.2%, any two or more than three kinds in Ti≤1.5%, rest part is made up of Fe and inevitable impurity.
xian You Ji Intraoperative document
patent documentation
Patent documentation 1: Japanese Laid-Open Patent Publication 60-234920 publication
Summary of the invention
the problem that invention will solve
Disclosed in above-mentioned patent documentation 1, hot-rolled condition is: complete hot rolling at the temperature more than 900 DEG C, reels, prevent uneven phase transformation on the run-out table, and make steel plate carry out martensitic transformation after the coiling at the temperature of 300 DEG C ~ 600 DEG C.
According to the research of the present inventor, confirming: after the coiling, even if in order to cause martensitic transformation to carry out temperature treatment, also at the Maraging steel strip (hereinafter referred to as the roll coil of strip) obtained that reels, the hardening hardness inequality in local can above occur.So, such as, when the carrying material of the stepless speed changer part (CVT) of the motor car engine for being required high plate thickness precision by cold rolling acquisition, become following large problem: due to the difference of energy of deformation when hardness inequality directly has influence on rolling, therefore cannot meet thickness of slab precision.
The object of the present invention is to provide a kind of method for winding of the hot rolling Maraging steel strip that the hardness of the local of the roll coil of strip after hot rolling can be suppressed to rise.
for the scheme of dealing with problems
Namely the present invention completes in view of the above problems.
Namely, the present invention is a kind of method for winding of hot rolling Maraging steel strip, it is after being heated to 1050 DEG C ~ 1300 DEG C by the starting material of maraging steel, carry out hot rolling, after obtaining Maraging steel strip, reel this Maraging steel strip and form the roll coil of strip, wherein, the temperature of the Maraging steel strip volume obtained by the above-mentioned Maraging steel strip of winding remains on the temperature more than Ms point in Maraging steel strip length range, then, after rolling up at above-mentioned Maraging steel strip the temperature being cooled to Ms point following, no longer backheat is to the temperature more than Ms point.
Preferably, form the method for winding of the hot rolling Maraging steel strip of the following roll coil of strip: the temperature that completes of above-mentioned hot rolling is set to 700 DEG C and is less than 900 DEG C, after obtaining Maraging steel strip, within completing from hot rolling 30 seconds, start above-mentioned Maraging steel strip to be wound as band web-like, on the roll coil of strip from having reeled after two minutes, the temperature of the width central part of roll coil of strip periphery, the temperature of the temperature of the width central part of roll coil of strip inner peripheral surface and the side of roll coil of strip central part is all more than Ms point and below 700 DEG C, and temperature head is within 300 DEG C.
the effect of invention
According to the method for winding of hot rolling Maraging steel strip of the present invention, the hardness of the Maraging steel strip after hot rolling can being suppressed to rise, the operations such as the cut-out caused by hardening can being saved, also more excellent in economy, productivity.
Accompanying drawing explanation
Fig. 1 is the schematic diagram representing the roll coil of strip obtained that reels.
Embodiment
The present inventor, by investigating the hardening reason in the local of the Maraging steel strip after hot rolling, obtains following opinion.
First, the hardness of local rise be considered to be caused by the tissue after there occurs martensitic transformation by cooling, the distinctive ageing behavior of maraging steel (Japanese: エ ー ジ Application グ effect) caused, and, the part that the points hardness caused by this ageing behavior rises is consistent with the part that temperature on the position temporarily cooled rises, and the reason of the temperature rising at temporary transient cooled position is the heat transfer from roll coil of strip inside.
That is, can not there is hardness inequality in the position merely cooled gradually, but the position causing temperature to rise after martensitic transformation significantly can produce the ageing behavior of local, causes causing hardness uneven.
Explain ageing behavior specific to this maraging steel.
The present inventors from the representative as maraging steel, namely quality % be the martensitic aging steel raw material of 18%Ni-9%Co-5%Mo-0.45%Ti-0.1%Al-bal.Fe, acquire and to be risen the test film that (backheat) hardness of causing rises by the temperature at temporary transient cooled position for investigating.The impact investigation of backheat reheats temporarily there occurs the above-mentioned test film after martensitic transformation, investigated the relation of temperature and time.
Occur that the ageing behavior that caused by backheat be the part of Maraging steel strip in the roll coil of strip is below Ms point, and again cause the situation of temperature rising.Therefore, test film is being kept after one hour with 850 DEG C, under the condition of water-cooled and air cooling, carrying out solution treatment.Water-cooled is envisioned for the situation of carrying out spraying cooling on the run-out table.Air cooling is envisioned for the situation directly making the roll coil of strip after hot rolling.Arbitrary test film all presents martensitic stucture, and Vickers' hardness is 310HV.
By above-mentioned test film is carried out reheating of 5 minutes, 10 minutes, 30 minutes and 60 minutes at each temperature 200 DEG C, 300 DEG C, 400 DEG C and 500 DEG C, measure the rising of the hardness caused by ageing behavior.Vickers hardness tester is used to carry out hardness measurement.Its result is represented in table 1.In addition, the Ms point of the maraging steel represented by table 1 is 220 DEG C.
table 1
As shown in table 1, the rising of hardness is not found with the test film after following 200 DEG C of Ms point reheat.But reheating of carrying out with 300 DEG C, hardness starts to rise a little under the maintenance condition of 5 minutes, this ascendant trend is higher and become more obvious along with reheating temperature, then becomes the hardness more than 350HV when reheating temperature and being more than 400 DEG C.In addition, although the test film after water-cooled is a little different from the test film hardness after air cooling, roughly the same trend is illustrated.
Thus, if be once cooled to below Ms, and metal structure is made to become martensite, when being reheated by backheat again afterwards, then revealing effective period effect at short notice, and this effect becomes more obvious along with reheating that temperature is higher or the time is longer.
Therefore, in the hot-rolled process of maraging steel, in order to not revealing effective period effect, after being cooled to the following temperature of Ms point, must can not be formed again more than the temperature of Ms point.If manifested ageing behavior, then hardness can rise as shown in Table 1 above, produces the ageing behavior of local at the position that this hardness rises, and causes hardness uneven, and is directly connected to the deterioration of the rolling accuracy in rear operation.That is, the manifesting of ageing behavior of maraging steel is to temperature sensitive.
By above-mentioned opinion, in the present invention, in order to eliminate hardness inequality, following method is applied.Below describe the structure specified in the present invention in detail.
In the present invention, after the starting material of maraging steel are heated to 1050 DEG C ~ 1300 DEG C, carry out hot rolling, after obtaining Maraging steel strip, reel this Maraging steel strip and form the roll coil of strip, the temperature of the Maraging steel strip volume obtained by the above-mentioned Maraging steel strip of winding remains on the temperature more than Ms point in Maraging steel strip length range, and after above-mentioned Maraging steel strip volume is cooled to the following temperature of Ms point, no longer backheat is to the temperature more than Ms point.
In the present invention, the temperature of the Maraging steel strip volume obtained by winding remains on temperature more than Ms in Maraging steel strip length range, is, in order to prevent, the Maraging steel strip that reels in the roll coil of strip manifests the ageing behavior caused by martensitic transformation-backheat.Preferably, remain the temperature of more than 30 DEG C in Ms point temperature, it is further preferred that remain the temperature of more than 70 DEG C in Ms point temperature.
In addition, when the temperature of the heating in hot rolling is less than 1050 DEG C, the raw-material hot workability of maraging steel reduces.Therefore, the hot rolling lower limit of raw-material Heating temperature is set to 1050 DEG C.On the other hand, when Heating temperature is more than 1300 DEG C, there is the danger that the raw-material ductility of maraging steel reduces on the contrary.Therefore, the hot rolling upper limit of raw-material Heating temperature is set to 1300 DEG C.
In addition, importantly, after above-mentioned Maraging steel strip volume is cooled to the following temperature of Ms point, no longer backheat is to the temperature more than Ms point.As mentioned above, even if the maraging steel after martensitic transformation is backheat also there will be the material of ageing behavior to the temperature several minutes more than Ms point.Once revealing effective period effect, then the hardness at the position of this revealing effective period effect can be caused to rise and cause hardness uneven.So, when carrying out cold rolling after hot rolling, become because hardness is uneven and be difficult to control cold rolling thickness.Therefore, in the present invention, after Maraging steel strip volume is cooled to the following temperature of Ms point, no longer make its backheat to the temperature more than Ms point.
By applying the manufacture method of specifying in above-mentioned the present invention, within the difference of hardness of the Maraging steel strip in the roll coil of strip can being set to Vickers' hardness 20HV.
Then, the preferred structure specified in the present invention is described.
In the present invention, after the starting material of maraging steel are heated to 1050 DEG C ~ 1300 DEG C, carry out hot rolling, hot rolling is completed temperature and be set to more than 700 DEG C and be less than 900 DEG C.This is because, for completing temperature by reducing hot rolling as much as possible, reduce the basic heat that ageing behavior produces.In addition, when completing hot rolling with temperature lower than the temperature completing temperature 900 DEG C exceeding hot rolling, its result can reduce the temperature head between roll coil of strip inner circumferential, periphery, central part.
At this, hot rolling being completed temperature and be set to more than 700 DEG C, is because processibility is lower and the bad ratio such as crackle occurs uprise when being less than this temperature.On the other hand, hot rolling is completed temperature and be set to and be less than 900 DEG C, this is because when for more than 900 DEG C, potentiality heat is comparatively large, and easily causes the ageing behavior of the local that the roll coil of strip occurs.Such as, roll coil of strip internal surface, roll coil of strip outside surface cool quick and that Ms point is following position because being exposed in extraneous air easily to become.On the other hand, the potentiality heat near roll coil of strip central authorities is larger.Therefore, though when the roll coil of strip internal surface of easily cooling, roll coil of strip outside surface become Ms point following, also there is the potentiality heat near because of roll coil of strip central authorities and make the situation of the internal surface of the roll coil of strip, the temperature backheat of outside surface.Therefore, preferably reducing the potentiality heat of the roll coil of strip, hot rolling being completed temperature specifications for being less than 900 DEG C.
The thickness of the Maraging steel strip utilizing hot rolling to obtain is more thin more can promote the cooling under carrier state, complete from hot rolling playing winding the roll coil of strip between Maraging steel strip is cooled equably.Its result, by making the lower thickness of the roll coil of strip, the potentiality heat drop near roll coil of strip central authorities when being formed as the roll coil of strip can be made low, such as, these are exposed to the backheat at the position of the local in extraneous air can to prevent roll coil of strip internal surface, roll coil of strip outside surface more reliably, can suppress the generation of ageing behavior.Therefore, the thickness of the Maraging steel strip obtained by hot rolling is set to below 2.5mm better.In addition, if the lower limit of the thickness of the Maraging steel strip after hot rolling is about 1.5mm, better as cold rolling use.
In addition, in the present invention, within completing from hot rolling 30 seconds, preferably start above-mentioned Maraging steel strip to be wound as the roll coil of strip.This is because, if be wound as the roll coil of strip rapidly from hot rolling completes, then can cool as roll coil of strip entirety, therefore, it is possible to prevent from becoming the temperature rising partly of martensitic position mutually.The better time to winding starts is within 25 seconds.In addition, in the present invention, so-called rolling completes the moment referring to that steel band goes out from roll row, and so-called winding starts to refer to the moment of the engaging-in wind2 in the leading section of Maraging steel strip.
In addition, because the time completing to the winding being wound as the roll coil of strip comparatively early then can promote the cooling to roll coil of strip entirety, therefore, within 5 minutes, winding is completed better.Preferably within 4 minutes.
Except above-mentioned condition, in the present invention, preferably, on the roll coil of strip from having reeled after two minutes, the temperature of the temperature of roll coil of strip periphery width central part, the temperature of width central part of roll coil of strip inner peripheral surface and the side of roll coil of strip central part is all more than Ms point and below 700 DEG C, and temperature head is located within 300 DEG C.
Except above-mentioned condition, in the present invention, preferably, on the roll coil of strip from having reeled after two minutes, the temperature of the temperature of roll coil of strip periphery width central part, the temperature of width central part of roll coil of strip inner peripheral surface and the side of roll coil of strip central part is all more than Ms point and below 700 DEG C, and temperature head is located within 300 DEG C.
In addition, when the roll coil of strip is more than 700 DEG C, or temperature head more than 300 DEG C time, the temperature head between the surface of the roll coil of strip in refrigerating work procedure and inside becomes greatly, may cause, in the inside of the roll coil of strip and surface, hardness occurs uneven.
In addition, in order to be set to said temperature, such as, except the above-mentioned hot rolling of adjustment completes temperature, except the adjustment winding time opening, utilizes the method for not carrying out compulsory water-cooled on the run-out table of usually carrying out also can realize.In addition, when may more than 700 DEG C, can also appropriate water be sprayed and by spraying cooling, temperature be adjusted in the process of winding Maraging steel strip.
In addition, in above-mentioned the present invention, so-called roll coil of strip internal surface refers to, by in the roll coil of strip 1 shown in Fig. 1, the inner surface of the roll coil of strip that Maraging steel strip leading section 3 that Maraging steel strip after hot rolling is wound at first is positioned at is called roll coil of strip internal surface 5, the outer surface of the roll coil of strip that the Maraging steel strip rearward end 2 that the Maraging steel strip after so-called roll coil of strip outside surface 4 refers to hot rolling is finally wound is positioned at.In addition, so-called roll coil of strip central part 6 refers to the region of the roll coil of strip roughly thickness of half in a thickness direction.
With regard to the measurement at above-mentioned three positions, be the width central part measuring Maraging steel strip for roll coil of strip internal surface and outside surface.This is because the backheat (temperature rising) caused by the potentiality thermal conductance of roll coil of strip central part is the fiercest near the width central part of Maraging steel strip.In addition, the temperature survey of roll coil of strip central part is carried out from the side of the roll coil of strip.
In addition, infrared thermography is utilized to carry out the temperature survey at above-mentioned three positions comparatively easy.
In addition, if represent an example of the composition of the maraging steel that can use in the present invention, then can use the material comprising following element: contain below C:0.15%, Ni:8% ~ 22%, Co:3% ~ 20%, Mo:2% ~ 9%, Ti:0% ~ 2%, below Al:2.5%, Cr:0% ~ 4%, oxygen with quality %: be less than 10ppm, nitrogen: be less than 15ppm, rest part is Fe and impurity.In addition, as selection element, and then the element of any one or more in below Mg:0.01%, below Ca:0.01%, below B:0.01% can also be contained.
embodiment
Following embodiment is utilized to illustrate in greater detail the present invention.
Utilize vacuum melting to manufacture consumable electrode, use above-mentioned consumable electrode to carry out vacuum arc re-melting, thus obtain martensitic aging bloom.Forge hot is carried out to the martensitic aging bloom obtained and forms the martensitic aging steel raw material that thickness is the hot rolling of 60mm.
The composition of martensitic aging bloom is represented in table 2.In addition, Ms point is 220 DEG C.
table 2(mass%)
| C | Ni | Cr | Co | Mo | Ti | Al | (O) | (N) | (Ca) | (Mg) | (B) |
| 0.004 | 18.54 | 0.01 | 9.33 | 5.00 | 0.47 | 0.13 | 2 | 5 | 1 | 2 | 2 |
Note 1: the element beyond element described above is Fe and impurity.
Note 2:() shown in element be ppm.
The martensitic aging steel raw material of the hot rolling that thickness is 60mm is used to carry out hot rolling.In addition, compulsory water-cooled on the run-out table is not carried out.In addition, in the process being wound as band web-like, spraying cooling is implemented.
Infrared thermography is utilized to measure the temperature of the roll coil of strip.Reel obtain Maraging steel strip volume temperature be 260 DEG C ~ 410 DEG C, in Maraging steel strip length range more than the temperature of Ms point.In addition, after Maraging steel strip volume is cooled to the following temperature of Ms point, no longer backheat is to the temperature more than Ms point.
Represent in table 3, table 4 hot rolling complete temperature, hot rolling after Maraging steel strip thickness, from hot rolling completes to the temperature of the roll coil of strip after the time starting to be wound as band web-like, winding just complete and the temperature variation that caused by the elapsed time.In addition, in the temperature survey at the position of three shown in table 3, " internal surface " and " outside surface " roll coil of strip internal surface 5 of representing for Fig. 1 and roll coil of strip outside surface 4, and, be the measuring tempeature near Maraging steel strip central authorities in the direction of the width.In addition, " central authorities " result of the roll coil of strip central part 6 of roll coil of strip side of representing for survey sheet 1.
The measurement of hardness is undertaken by following mode: after cooling completes, untie the roll coil of strip, and from being equivalent to above-mentioned " internal surface ", the Maraging steel strip at position of " outside surface " and " central authorities " gathers hardness measurement test film.Remove the oxide skin of the hardness measurement test film collected, grind further,
Its hardness is measured from face side.
table 3
Table 4
As implied above, establish in the scope that specifies in the present invention owing to hot rolling to be completed temperature, therefore, it is possible to reduce the temperature head in the roll coil of strip.
In addition, there is not hardness that the ageing behavior because of local causes and to rise the hardness inequality produced in the Maraging steel strip that the method for winding that utilizes the present invention to specify obtains, there is not the shape defects such as distortion yet.
In addition, the Maraging steel strip that the method for winding utilizing the present invention to specify obtains can make the hardness of below 350HV in length range.Particularly, the fluctuation of hardness within 20HV, also can be formed as hardness even in roll coil of strip length range.
utilizability in industry
Manufacture method of the present invention can be applied to the starting material that there is the problem of changes in hardness when carrying out hot rolling, winding to the material of the transformation temperature with metal structure.
description of reference numerals
1, the roll coil of strip; 2, Maraging steel strip rearward end; 3, Maraging steel strip leading section; 4, roll coil of strip outside surface; 5, roll coil of strip internal surface; 6, roll coil of strip central part.
Claims (2)
1. a method for winding for hot rolling Maraging steel strip, it, after the starting material of maraging steel are heated to 1050 DEG C ~ 1300 DEG C, carries out hot rolling, after obtaining Maraging steel strip, reel this Maraging steel strip and form the roll coil of strip, it is characterized in that
The temperature that completes of above-mentioned hot rolling is set to more than 700 DEG C and is less than 900 DEG C,
Wound into coiled stock as follows: on the roll coil of strip from having reeled after two minutes, the temperature of the temperature of the width central part of roll coil of strip periphery, the temperature of the width central part of roll coil of strip inner peripheral surface and the side of roll coil of strip central part is all more than Ms point and below 700 DEG C, the temperature head of the temperature of the temperature of the width central part of above-mentioned roll coil of strip periphery, the temperature of the width central part of above-mentioned roll coil of strip inner peripheral surface and the side of above-mentioned roll coil of strip central part is within 300 DEG C
Thus, the temperature of the Maraging steel strip volume obtained by the above-mentioned Maraging steel strip of winding remains on the temperature more than Ms in Maraging steel strip length range, then, after rolling up at above-mentioned Maraging steel strip the temperature being cooled to Ms point following, no longer backheat is to the temperature more than Ms point.
2. the method for winding of hot rolling Maraging steel strip according to claim 1, is characterized in that,
After obtaining Maraging steel strip, within completing from hot rolling 30 seconds, start above-mentioned Maraging steel strip to be wound as band web-like, and completed winding within 5 minutes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-062235 | 2011-03-22 | ||
| JP2011062235 | 2011-03-22 | ||
| PCT/JP2012/057123 WO2012128272A1 (en) | 2011-03-22 | 2012-03-21 | Method for winding hot-rolled maraging steel strip |
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| Publication Number | Publication Date |
|---|---|
| CN103459619A CN103459619A (en) | 2013-12-18 |
| CN103459619B true CN103459619B (en) | 2015-06-10 |
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| CN201280014083.9A Active CN103459619B (en) | 2011-03-22 | 2012-03-21 | Method for winding hot-rolled maraging steel strip |
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| JP (1) | JP5344329B2 (en) |
| CN (1) | CN103459619B (en) |
| WO (1) | WO2012128272A1 (en) |
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| WO2014046181A1 (en) * | 2012-09-21 | 2014-03-27 | 日立金属株式会社 | Method for manufacturing maraging steel coil |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101687238A (en) * | 2007-03-28 | 2010-03-31 | Sms西马格股份公司 | Method and device for winding hot-rolled strip |
| CN101755058A (en) * | 2007-06-22 | 2010-06-23 | Sms西马格股份公司 | Be used for method that the steel band that is formed from steel is carried out hot rolling and heat-treats |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60234920A (en) * | 1984-05-04 | 1985-11-21 | Nippon Kokan Kk <Nkk> | Manufacture of ultrahigh tensile maraging cold rolled steel plate |
| FR2850671B1 (en) * | 2003-02-05 | 2006-05-19 | Usinor | PROCESS FOR MANUFACTURING A DUAL-PHASE STEEL BAND HAVING A COLD-ROLLED FERRITO-MARTENSITIC STRUCTURE AND A BAND OBTAINED THEREFROM |
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2012
- 2012-03-21 JP JP2012538006A patent/JP5344329B2/en active Active
- 2012-03-21 CN CN201280014083.9A patent/CN103459619B/en active Active
- 2012-03-21 WO PCT/JP2012/057123 patent/WO2012128272A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101687238A (en) * | 2007-03-28 | 2010-03-31 | Sms西马格股份公司 | Method and device for winding hot-rolled strip |
| CN101755058A (en) * | 2007-06-22 | 2010-06-23 | Sms西马格股份公司 | Be used for method that the steel band that is formed from steel is carried out hot rolling and heat-treats |
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| Publication number | Publication date |
|---|---|
| WO2012128272A1 (en) | 2012-09-27 |
| JPWO2012128272A1 (en) | 2014-07-24 |
| JP5344329B2 (en) | 2013-11-20 |
| CN103459619A (en) | 2013-12-18 |
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