CN100434200C - Method for preventing surface oxide film of nichrome roller from being peeling-off - Google Patents
Method for preventing surface oxide film of nichrome roller from being peeling-off Download PDFInfo
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- CN100434200C CN100434200C CNB2006101023665A CN200610102366A CN100434200C CN 100434200 C CN100434200 C CN 100434200C CN B2006101023665 A CNB2006101023665 A CN B2006101023665A CN 200610102366 A CN200610102366 A CN 200610102366A CN 100434200 C CN100434200 C CN 100434200C
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Abstract
A method for preventing the surficial oxide film of Ni-Cr roller from being stripped includes such steps as blooming the conticast billet of ferritic stainless steel at 1150 +/- 50 deg.C to become intermediate billet at 1020-1050 deg.C and with a thickness less than 35 mm, arranging an insulating hood between blooming and finish rolling, and finishing rolling of stainless steel band at a temp higher than 950 deg.C by three passes with relative surface roughness of rollers (0.9 microns, 0.6 microns and 0.6 microns) and relative maximal deformation rate (42%, 38% and 36%).
Description
Technical field
The present invention relates to a kind of method that prevents nickel chromium triangle roller surface spalling of oxide film, prevent high-ni-cr roll surface film oxide method for exfoliating when specifically being rolling ferritic stainless steel.
Background technology
Because variation has taken place in the demand direction in stainless steel market, the demand percentage of ferritic stainless steel is increased to more than 30% by 10% suddenly, and the trend that increases does not subtract, and in the process of using high Ni-Cr roll production ferritic stainless steel hot-rolling band steel, exist roller surface spalling of oxide film phenomenon always, thereby cause roller surface coarse, serious roughness value increase appears in the hot-strip surface that causes producing, thereby cold rolling finished surface quality is descended.This problem becomes one of principal element of restriction ferritic stainless steel fast development, the stainless steel hot-rolling factory director phase is devoted to the research of roller surface spalling of oxide film both at home and abroad, proposed to prevent the method for nickel chromium triangle roller surface spalling of oxide film, wherein most typical method is to improve rolling temperature, the suitable processing temperature of ferritic stainless steel hot-rolling is 900 ℃-1100 ℃, the easiest band steel and the finish rolling leading portion breast roller of causing takes place to bond and make the roller surface spalling of oxide film during hot rolling in this temperature range, abroad start rolling temperature is brought up to more than 1260 ℃ in order to prevent the roll bonding, make finish rolling leading portion frame rolling temperature avoid easily taking place the temperature of bonding, use price to exceed the high-speed steel roll of about five times on high Ni-Cr roll in the leading portion frame simultaneously as working roll, the method has following deficiency: (1) is improved rolling temperature and is caused the continuous casting billet excessive grain to grow up, and has a strong impact on the cold-forming property of stainless steel finished product; (2), still have bonding in various degree to take place though finish rolling leading portion frame has been avoided the temperature of easy generation bonding, and the back segment frame still can't be avoided this temperature range; (3) use high-speed steel roll cost costliness and service condition harshness, bring inconvenience and cost higher to production control.
Summary of the invention
In order to overcome the existing above-mentioned deficiency that prevents the method for nickel chromium triangle roller surface spalling of oxide film, the invention provides a kind of cost low, to the little method that prevents nickel chromium triangle roller surface spalling of oxide film of stainless steel finished product cold-workability influence.
Originally the method that prevents nickel chromium triangle roller surface spalling of oxide film is improved from following five aspects:
(1) optimizes roll dressing technology, reduce the value of the roughness of roller surface
The operation of rolling is directly exerted pressure to be out of shape to the band steel by roll and is realized, particularly there is relative slip between roll and the band steel in the operation of rolling, and the friction of this slip is the main cause that causes the roll spalling of oxide film, thereby the roughness of belt steel surface roller surface spalling of oxide film in the operation of rolling causes, it is roughness that the surface roughness of roll directly has influence on strip surface quality, the roughness value that reduces roller surface can obviously slow down the wearing and tearing of roll in the operation of rolling, not having roll adhesion problem shaping roll surface roughness value Ra because of the roughing start rolling temperature is higher is 1.5 μ m, reduce the roll surface roughness value of finishing mill, first rolling-mill roller surface roughness value R of finishing mill
a≤ 0.9 μ m, second to the 4th rolling-mill roller surface roughness value R
a≤ 0.6 μ m, the 5th to the 7th rolling-mill roller surface roughness value R
a≤ 0.4 μ m (first rolling-mill roller surface roughness value of finish rolling R of existing rolling mill
a≤ 1.5 μ m, all the other frame R
a≤ 1.0 μ m).
(2) select suitable rolling temperature
But improve finish rolling inlet temperature controlled rolling bonding phenomenon thereby improve heating-up temperature, but in order to guarantee the performance of cold rolling final products, the stainless heating-up temperature of rolling ferrite should be controlled at about 1150 ℃, therefore can only improve the band aluminium by improvement roughing cooling means and mill speed and be rolled into a mouthful temperature.In order to guarantee under the rolling stable prerequisite of roughing, select the roughing outlet temperature to be controlled at 1030 ℃-1050 ℃.
(3) not de-scaling of finish rolling
In the operation of rolling, one deck iron scale that belt steel surface exists is that Powdered (the stainless steel non-oxidizability is strong, iron scale is thin, be Powdered after the crushing) separated and be with the steel body to contact with the direct of roll, between has played lubrication to a certain extent simultaneously, be with the frictional force of steel in the operation of rolling thereby effectively alleviate, and then reduce the wearing and tearing of roller surface, reduce the generation of roller surface spalling of oxide film at roller surface.Do not carry out de-scaling before the finish rolling, do not throw iron scale and suppress water, and adopt steam blowing (de-scaling water is the means of de-scaling, and it is the means that the control iron scale produces that iron scale suppresses water).Between roughing mill and finishing mill, stay-warm case is set, improves the temperature of intermediate blank through stay-warm case; By changing the relative position of cooling manifold and water discharging board, (adjust between the two spacing and the angle of water nozzle) increase and cut outlet capacity, improved milling train and cut the water effect, prevent cooling water flow to the band steel, promotion belt steel surface oxide-film evenly generates.
(4) reduce the thickness that roughing exports intermediate blank
The deformation rate in finish rolling district when roughing feeding thickness directly influences belt steel rolling, and roughing feeding thickness is big more under the identical situation of finished product thickness, the biting speed of first rolling mill of finish rolling is low more, because temperature is on the low side during the distortion of finish rolling district, and strengthen feeding thickness and continue to make the first rolling mill biting speed reduction can cause band steel afterbody temperature to descend big more, the plasticity of band steel descends, and surface quality worsens; While, the draught pressure during finish rolling was big more owing to finishing stand generation roller surface oxide-film peels off, and peeling off of oxide-film is serious more.Reduce the thickness of roughing outlet intermediate blank, can effectively alleviate the load of each frame of finish rolling, obviously improve the quality of belt steel surface.The present invention increases the roughing deformation rate, reduces the thickness of roughing outlet intermediate blank, reduces the deformation rate of finish rolling.The present invention will have roughing thickness 38mm, 33mm now and be reduced to 35mm and 30mm respectively.
(5) change the finish rolling burden apportionment
From rolling tracking situation, the peeling phenomenon of roller surface generally occurs in finish rolling leading portion frame, first to the 3rd frame, therefore the load that increases the back segment frame alleviates the load of leading portion frame, can improve the peeling off of roller surface oxide-film of leading portion frame effectively, and because the ferritic stainless steel resistance of deformation is little, it is also little for plate shape control influence to increase back segment frame load.The largest deformation rate of the first, second, third and the 4th roll stand of existing finish rolling is respectively 42%, 38%, 36%, 30%, the largest deformation rate of the first, second, third and the 4th roll stand of finish rolling of the present invention is respectively≤and 38%, ≤ 36.5% ,≤33.6% ,≤28.4%.
Originally the method that prevents nickel chromium triangle roller surface spalling of oxide film comprises following step successively:
General with one to two roughing mill, can be back and forth rolling, continuous casting billet is rolled into thin intermediate blank, advance finishing mill then and be rolled into finished product.
(1) roughing
With temperature is that 1150 ± 50 ℃ ferrite stainless steel continuous casting billet is sent into roughing mill, strip speed is 2.8 meter per seconds-5.5 meter per seconds, after the some passages of roughing mill are rolling, generally after five passages are rolling, be rolled into temperature and be that 1020～1050 ℃, deformation rate are not less than 78%, the thickness of roughing outlet is the stainless steel intermediate blank of 35mm to the maximum, be sent to finish rolling by the roughing outlet roller-way that has stay-warm case; For improving the roughing outlet temperature, each passage mill speed of roughing controls to limiting value, be respectively 2.2 meter per seconds, 2.5 meter per seconds, 4.2 meter per seconds, 5.0 meter per seconds, 5.5 meter per seconds, the auxiliary equipment cooling water adopts control automatically before and after the roughing mill, do not spray water when realizing steel, spray water during not steel rolling, steam blowing is adopted in the roughing outlet, blows the water that most surface of steel plate is assembled.
Roller-way between roughing and the finish rolling (60 meters are long) is installed the stay-warm case that has heat accumulation plate up and down, the control heat radiation, and the roller-way cooling water angle is correct, can not be splashed on the steel plate, and the roughing outlet temperature is controlled at 1030 ℃-1050 ℃;
(2) finish rolling
Rolling through six to seven finishing mills is finished product, the peeling phenomenon of roller surface generally occurs in first finishing stand to the, three finishing stands of finish rolling leading portion, one of the present invention's technical characterstic in finish rolling is the load that increases the back segment frame, and control alleviates the deformation rate of first finishing stand to the, three finishing stands.
It is rolling that I sends into first finishing stand to the stainless steel strip of temperature 〉=950 ℃, the surface roughness value R of the roll of first finishing stand
a≤ 0.9 μ m, largest deformation rate≤42%;
It is rolling that II sends into second finishing stand to the stainless steel strip after rolling, the surface roughness value R of the roll of second finishing stand
a≤ 0.6 μ m, largest deformation rate≤38%;
It is rolling that III sends into the 3rd finishing stand to the stainless steel strip after rolling, the surface roughness value R of the roll of the 3rd finishing stand
a≤ 0.6 μ m, largest deformation rate≤36%;
It is rolling that IV sends into the 4th finishing stand to the stainless steel strip after rolling, the surface roughness R of the roll of the 4th finishing stand
a≤ 0.6 μ m, largest deformation rate≤30%;
It is rolling that V sends into the 5th finishing stand to the stainless steel strip after rolling, the surface roughness R of the roll of the 5th finishing stand
a≤ 0.4 μ m, largest deformation rate≤24%;
It is rolling that VI sends into the 6th finishing stand to the stainless steel strip after rolling, the surface roughness R of the roll of the 6th finishing stand
a≤ 0.4 μ m, the largest deformation rate is≤20%.
It is rolling that VII sends into the 7th finishing stand to the stainless steel strip after rolling, the surface roughness R of the roll of the 7th finishing stand
a≤ 0.4 μ m, the largest deformation rate is≤15%.
The parameter of each frame of finish rolling sees Table 1:
Table 1
| Finishing mill | Roll roughness R a | Deformation rate | Mill speed |
| First finishing stand | 0.7～0.9μm | 38.4％ | 0.69m/s |
| Second finishing stand | 0.4～0.6μm | 36.5％ | 1.09m/s |
| The 3rd finishing stand | 0.4～0.6μm | 33.6％ | 1.65m/s |
| The 4th finishing stand | 0.4～0.6μm | 28.4％ | 2.49m/s |
| The 5th finishing stand | 0.3～0.4μm | 22.3％ | 3.49m/s |
| The 6th finishing stand | 0.3～0.4μm | 17.5％ | 4.5m/s |
| The 7th finishing stand | 0.3～0.4μm | 13.2％ | 5.2m/s |
Generally through six frame finishing mills rolling can be rolling be finished product, require bigger rolling of deformation rate through seven finishing mills.
The finish rolling finishing temperature is controlled at 820～860 ℃, and not de-scaling in the finish rolling process is closed iron scale and suppressed water.
In the above-mentioned method that prevents nickel chromium triangle roller surface spalling of oxide film, the deformation rate of roughing is preferable with 82%-86%.
Originally the method effect that prevents nickel chromium triangle roller surface spalling of oxide film is obvious, and before employing this method, rolling ferritic stainless steel is because the roller surface spalling of oxide film causes coarse (the roughness value R of belt steel surface
a〉=4.5 μ m) ratio reaches 14.35%, cause cold rolling generation degradation in enormous quantities and defective work, degradation reaches 9.1%, waste product reaches 3.3%, after employing originally prevents the method for nickel chromium triangle roller surface spalling of oxide film, the roller surface spalling of oxide film phenomenon that occurs during rolling ferritic stainless steel is controlled effectively, and the cold drawing degradation of generation drops to 1.25%, and disqualification rate drops to 0.2%.This method is compared with the existing method that prevents nickel chromium triangle roller surface spalling of oxide film that improves rolling temperature, and rolling cost is low, and rolling back is little to the influence of stainless steel finished product cold-workability, is convenient to be applied to hot-rolled stainless steel band steel and produces actual.The Ni occupation rate of China is lower, the shortage of Ni resource makes the production of austenitic stainless steel be subjected to serious restriction, therefore imperative at China development joint Ni type ferrite stainless, and the domestic complete hot rolling production technology of a cover that also do not form, thereby of the present invention applying, domestic development ferritic stainless steel is had very important meaning.
The specific embodiment
Originally prevent the method specific embodiment of nickel chromium triangle roller surface spalling of oxide film below in conjunction with the embodiment detailed description, but prevent that originally the specific embodiment of the method for nickel chromium triangle roller surface spalling of oxide film is not limited to following embodiment.
Present embodiment is a roughing mill and seven semi-tandem rolling production lines that finish rolling constitutes, and present embodiment comprises following step successively:
(1) roughing
With temperature is that 1150 ℃, thickness are that 200 millimeters ferrite stainless steel continuous casting billet is sent into roughing mill, strip speed is 2.2 meter per seconds, after roughing mill five passages are rolling, be rolled into temperature and be 1020～1050 ℃, thickness and be 30～35 millimeters stainless steel intermediate blank, the deformation rate of present embodiment roughing is 84%, middle bad thickness is 32 millimeters, is sent to finish rolling by the roughing outlet roller-way that has stay-warm case; Each passage mill speed of roughing controls to limiting value, be respectively 2.2 meter per seconds, 2.5 meter per seconds, 4.2 meter per seconds, 5.0 meter per seconds, 5.5 meter per seconds, the auxiliary equipment cooling water will adopt automatic control before and after the milling train, do not spray water when realizing steel, steam blowing is used in the roughing outlet, blows the water that most surface of steel plate is assembled.Roller-way between roughing and the finish rolling (60 meters long) is installed the stay-warm case control heat radiation that has heat accumulation plate up and down, and the roller-way cooling water angle is correct, can not be splashed on the steel plate, guarantees that the finish rolling inlet temperature is not less than 950 ℃.
(2) finish rolling
It is rolling that I is that 1000 ℃, thickness are that 32 millimeters stainless steel strip is sent into first finishing stand to temperature, the surface roughness value R of the roll of first finishing stand
a0.8 the modification rate is 38.4% (sending into thickness with last frame is as the criterion), is rolled into thickness and is 19.7 millimeters band steel;
II is thickness that 19.7 millimeters stainless steel strip is rolling through second finishing stand, the surface roughness value R of the roll of second finishing stand
a0.5 the modification rate is 36.5%, is rolled into thickness and is 12.51 millimeters band steel;
III is thickness that 12.51 millimeters stainless steel strips are rolling through the 3rd finishing stand, the surface roughness value R of the roll of the 3rd finishing stand
a0.5 the modification rate is 33.6%, is rolled into thickness and is 8.3 millimeters band steel;
IV is thickness that 8.3 millimeters stainless steel strips are rolling through the 4th finishing stand, the surface roughness R of the roll of the 4th finishing stand
a0.5 the modification rate is 28.4%, is rolled into thickness and is 5.9 millimeters band steel;
V is thickness that 5.9 millimeters stainless steel strips are rolling through the 5th finishing stand, the surface roughness R of the roll of the 5th finishing stand
a0.4 the modification rate is 22.3%, is rolled into thickness and is 4.9 millimeters band steel;
VI is thickness that 4.9 millimeters stainless steel strips are rolling through the 6th finishing stand, the surface roughness R of the roll of the 6th finishing stand
a0.4 the modification rate is 17.5%, is rolled into thickness and is 4.0 millimeters band steel;
VII is thickness that 4.0 millimeters stainless steel strips are rolling through the 7th finishing stand, the surface roughness R of the roll of the 7th finishing stand
a0.4 the modification rate is 13.2%, is rolled into thickness and is 3.5 millimeters band steel.
The finish rolling finishing temperature is controlled at 820～860 ℃, and not de-scaling in the finish rolling process is closed iron scale and suppressed water.
In the foregoing description
Roughing mill form: 1549mm four-high reversing mill; Finishing mill form: 1549mm four roller one-way rolling mills.
Claims (3)
1. method that prevents nickel chromium triangle roller surface spalling of oxide film, it comprises following step successively:
(1) roughing
With temperature is that 1150 ± 50 ℃ ferrite stainless steel continuous casting billet is sent into roughing mill, be rolled into temperature and be that 1020～1050 ℃, deformation rate are not less than 78%, the thickness of roughing outlet is the stainless steel intermediate blank of 35mm to the maximum, be sent to finish rolling by the roughing outlet roller-way that has stay-warm case, auxiliary equipment cooling water before and after the roughing mill, do not spray water when realizing steel, spray water during not steel rolling, steam blowing is adopted in the roughing outlet, blows the water that most surface of steel plate is assembled;
Roller-way is installed the stay-warm case that has heat accumulation plate up and down between roughing and the finish rolling, the control heat radiation, and the roller-way cooling water can not be splashed on the steel plate, and the roughing outlet temperature is controlled at 1030 ℃-1050 ℃;
(2) finish rolling
It is rolling that I sends into first finishing stand to the stainless steel strip of temperature 〉=950 ℃, the surface roughness value R of the roll of first finishing stand
a≤ 0.9 μ m, largest deformation rate≤42%;
It is rolling that II sends into second finishing stand to the stainless steel strip after rolling, the surface roughness value R of the roll of second finishing stand
a≤ 0.6 μ m, largest deformation rate≤38%;
It is rolling that III sends into the 3rd finishing stand to the stainless steel strip after rolling, the surface roughness value R of the roll of the 3rd finishing stand
a≤ 0.6 μ m, largest deformation rate≤36%;
Rolling through six to seven finishing stands, rolling is finished product, and the finish rolling finishing temperature is controlled at 820～860 ℃, and not de-scaling in the finish rolling process is closed iron scale and suppressed water.
2. the method that prevents nickel chromium triangle roller surface spalling of oxide film according to claim 1 is characterized in that: the deformation rate of roughing is 82%-86%; Strip speed is 2.8 meter per seconds-5.5 meter per seconds, and each passage mill speed of roughing controls to limiting value, and the limit of roughing previous three passes mill speed is respectively 2.2 meter per seconds, 2.5 meter per seconds, 4.2 meter per seconds.
3. the method that prevents nickel chromium triangle roller surface spalling of oxide film according to claim 1 and 2 is characterized in that the surface roughness and the largest deformation rate of the roll of the 4th finishing stand to the seven finishing stands is respectively: the surface roughness R of roll
a≤ 0.6 μ m, largest deformation rate≤30%; The surface roughness R of roll
a≤ 0.4 μ m, largest deformation rate≤24%; The surface roughness R of roll
a≤ 0.4 μ m, the largest deformation rate is≤20%; The surface roughness R of roll
a≤ 0.4 μ m, the largest deformation rate is≤15%.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006101023665A CN100434200C (en) | 2006-12-31 | 2006-12-31 | Method for preventing surface oxide film of nichrome roller from being peeling-off |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101023665A CN100434200C (en) | 2006-12-31 | 2006-12-31 | Method for preventing surface oxide film of nichrome roller from being peeling-off |
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| CN100434200C true CN100434200C (en) | 2008-11-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110280605A (en) * | 2019-06-17 | 2019-09-27 | 首钢集团有限公司 | A method of reducing roll spalling of oxide film rate |
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| CN101618406B (en) * | 2008-06-30 | 2012-02-01 | 鞍钢股份有限公司 | Surface color difference control method for hot-rolled pickled plate |
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| CN107497854A (en) * | 2017-09-27 | 2017-12-22 | 马鞍山钢铁股份有限公司 | A kind of hot-strip finishing mill roller surface oxidizing and depressing method |
| CN113500098B (en) * | 2021-08-20 | 2023-04-07 | 山西太钢不锈钢股份有限公司 | Method for eliminating rolling chromatic aberration of ultrapure ferrite stainless steel by five-rack six-roller continuous rolling mill |
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|---|---|---|---|---|
| CN110280605A (en) * | 2019-06-17 | 2019-09-27 | 首钢集团有限公司 | A method of reducing roll spalling of oxide film rate |
| CN110280605B (en) * | 2019-06-17 | 2020-07-24 | 首钢集团有限公司 | Method for reducing peeling rate of roller oxide film |
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| CN101003053A (en) | 2007-07-25 |
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