CN109550793A - A kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction - Google Patents
A kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction Download PDFInfo
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- CN109550793A CN109550793A CN201710889358.8A CN201710889358A CN109550793A CN 109550793 A CN109550793 A CN 109550793A CN 201710889358 A CN201710889358 A CN 201710889358A CN 109550793 A CN109550793 A CN 109550793A
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- rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
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- 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
Abstract
A kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction, comprising: without de-scaling and water cooling treatment in the hot rolling overall process of middle high-chrome super-purity ferrite stainless steel, and it controls: 1) heating of plate blank: 1150~1200 DEG C of heating temperature, 180~230min of heating time；2) 7 passage roughing, 30~35mm of workpiece thickness rough rolling step: are carried out；3) the finish rolling stage: each percentage pass reduction≤35% of F1-F4 rack in F1~F7 rack.High-chrome super-purity ferrite stainless steel effectively reduces hot roll mark depth of defect in the process to method provided by the invention during manufacturing, reduces rear road cold rolling process surface defect severity of grind, reduces roller consumption.
Description
Technical field
The present invention relates to stainless steel manufacturing methods, and in particular to high-chrome super-purity ferrite stainless steel hot rolling is viscous in a kind of reduction
The method of roller defect.
Background technique
Middle high-chrome super-purity ferrite stainless steel has excellent corrosion resistance, good formability and welding performance, and alloy
At low cost, apparent consumption is gradually increased.But its elevated temperature strength is low, easily generates with roll contact in Hot Strip Rolling viscous
Knot, leads to belt steel surface partial failure, seriously affects strip surface quality, and roll surface is caused to fail.It is this because of stocking
Surface defect needs to eliminate by the grinding of rear road cold rolling process caused by bonding with roll, and middle height has been significantly greatly increased
The production cost of chrome super-purity ferrite stainless steel becomes the main technique bottleneck for restricting ferritic stainless steel fast development.How
It solves the problems, such as super-purity ferrite stainless steel hot continuous rolling roll banding defect, is high-volume low cost production super-purity ferrite stainless steel
Key point.
Middle high-chrome super-purity ferrite stainless steel (Cr content is 16-30%, C+N impurity content≤0.03%) hot continuous rolling is suitable
Rolling temperature be 900-1100 DEG C, but the hot rolling in this temperature range is easiest to roll in first three rack at strip and finish rolling
Roller bonds.External steel mill is to prevent bonding, and mainly raising start rolling temperature makes finish rolling front end machine to 1260 DEG C or more
Frame avoids the temperature easily bonded, but this method will lead to slab ferrite crystal grain and excessively grow up, and cause hot-rolling edge cracking, very
The cold-forming property of finished product can extremely be seriously affected.
Chinese patent CN101003053A passes through optimization roll mill from the angle for solving nickel chromium triangle roll spalling of oxide film
Cutting technique reduces roll surface roughness, selection rolling temperature appropriate, finish rolling not de-scaling, reduces workpiece thickness and change essence
Rolling sharing of load etc. improves the ultrapure stainless steel strip surface quality of hot continuous rolling.But the patent only accounts for how preventing nickel chromium triangle
The measure of roller surface spalling of oxide film fails to consider heating of plate blank oxidation and belt steel surface oxidation film to avoiding roll and substrate
The advantageous effect directly contacted.
Summary of the invention
The purpose of the present invention is to provide a kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction,
Ferrite stainless steel surface roll banding depth of defect is significantly reduced, the amount of grinding of cold rolling process is substantially reduced, reduces production cost.
In order to achieve the above objectives, the technical scheme is that
A kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction comprising: it is ultrapure in middle high chromium
Without de-scaling and water cooling treatment in the hot rolling overall process of ferritic stainless steel, and control in course of hot rolling:
1) heating of plate blank: 1150~1200 DEG C of heating temperature, 180~230min of heating time；
2) 7 passage roughing, 30~35mm of workpiece thickness rough rolling step: are carried out；
3) the finish rolling stage: each percentage pass reduction≤35% of F1-F4 rack in F1~F7 rack.
Further, ROLLING OIL is not used on the finish rolling stage, mm finishing mill unit.
The method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect is mainly from following several in reduction provided by the present invention
Point is controlled:
(1) hot rolling slab surface oxidation film thickness is improved
Middle high-chrome super-purity ferrite stainless steel high temperature oxidation resistance is strong, at traditional 1050~1100 DEG C of slab heating temperature
It is difficult to be formed the oxidation film with certain thickness, uniformly continuous in range.This film heterogeneous is during the rolling process easily
Failure, causes roll directly to contact and cohere with steel matrix.
The present invention improves slab heating temperature to 1150~1200 DEG C, can form the oxidation film of even compact and effectively improve
Oxide thickness.This continuous, even compact oxidation film avoids ferritic stainless steel strip steel during the rolling process and rolls
The direct contact of roller, the bonding for significantly reducing ferritic stainless steel and roll are inclined to, meanwhile, roller surface is protected, is subtracted
Small roller surface abrasion.Conversely, stainless steel watch surface oxidation film is in interrupted, uneven when slab heating temperature is lower than 1150 DEG C
Even state, this non-homogeneous oxidation film is easy to fall off during the rolling process, and is easy to cause roller surface spalling of oxide film, most
Lead to bonding phenomenon eventually.When slab heating temperature is higher than 1250 DEG C, sharply coarsening, coil of strip are warm for ferrite grain size
Poor processability is easy to cause edge crack of steel coil, while surface oxygen atoms are spread along crystal boundary to intrinsic silicon, lead to oxygen in crystal boundary
Change, generates surface defect.
(2) overall process not de-scaling is rolled
Pair rolling stainless steel art will carry out De-scaling box HSB high-pressure water descaling before requiring heating slab rough rolling；Roughing 1,
3,5 passage high-pressure water descaling；Finish rolling inlet steam de-scaling, still, this technique will lead to matrix exposed after oxide skin removes
It is directly contacted with roll, it is easy to cause the roll banding defect of belt steel surface.And at a temperature of de-scaling water also results in steel slab surface
Drop, edge temperature declines more very, it could even be possible to causing strip final rolling temperature to fall within the temperature range easily bonded, most
Steel edge portion even whole face bonding phenomenon is caused to occur eventually.
The present invention rolls whole closing slab de-scaling water installations, closes roughing and finish rolling de-scaling water, handles without de-scaling,
The protective effect for taking full advantage of the oxidation film that belt steel surface generates in heating process, not only can reduce belt steel surface temperature drop, but also
It can guarantee there is one layer of thin oxide film to be attached to belt steel surface during the rolling process, strip is avoided to contact with the direct of roll.
(3) rolling overall process strip does not have to water, avoids temperature drop
It is cooling without water in the operation of rolling, belt steel surface temperature drop can be effectively reduced, is avoided because of surface film oxide and matrix
Expansion coefficient difference caused by oxide layer deterioration so that surface film oxide keeps certain thickness and to belt steel surface covering
Uniformity, and keep oxidation film that there is a degree of ductility with strip during the rolling process, make belt steel surface oxidation film
Thickness is uniform, to reduce belt steel surface roughness.
It is preferably avoided in addition to closing de-scaling water and closing rack cooling water using ROLLING OIL in the finish rolling stage.
(4) the pressure distribution of finish rolling F1-F4 rack is reduced
Stainless steel hot tandem rolling bonds the zone of slippage on the entry side for occurring mainly in strip Yu roll contact arc, and as strip and roll connect
The increase of arc zone of slippage on the entry side proportion and contact pressure is touched, bonding tendency becomes larger.Stainless steel at roll and strip contact arc
When superficial layer plastic deformation reaches a certain critical value, belt steel surface spalling of oxide film, local placticity failure will be in superficial layer
Occur, in this way since the stainless steel particles that local plastic fails and generates will be sent to roller surface.Therefore, to avoid office
Portion's failure reduces bonding tendency, need to reduce the pressure load of rack, suitably to guarantee the table of strip Yu roll contact arc zone of slippage on the entry side
Face plastic deformation is lower than critical value.
Under conventional hot continuous rolling machine finish rolling load distribution mode, to guarantee rolling stability and template, rolling load setting from
From high to low, this F1-F4 breast roller for resulting in rolling load high easily bonds F1-F7 rack with belt steel surface.
The present invention is to reduce F1-F4 rack rolling load, increase roughing rolling pass to 7, and workpiece thickness is dropped
Down to 35~30mm, each percentage pass reduction≤35% of F1-F4 rack is obtained.
Rack reduction ratio has great influence to lower machine roll surface roughness in the present invention, as shown in Figure 1.As shown in Figure 1, when
When rack reduction ratio is less than 35%, the variation of machine roll surface roughness is smaller under roll, but when more than 35%, roughness sharply increases
Add.Excessively high reduction ratio makes the plastic deformation of the superficial layer at roll and strip contact arc be more than a certain critical value, causes surface
The placticity failure of layer part, eventually leads to roll banding, and roller surface is caused to fail.
Beneficial effects of the present invention:
1. the present invention is by improving slab heating temperature to 1150~1200 DEG C, in super-purity ferrite stainless steel steel slab surface
The oxidation film for foring uniformly continuous avoids steel matrix and directly contacts with roller surface and lead to roll banding.
2. the present invention does not open to slab not de-scaling, roughing not de-scaling, finish rolling not de-scaling and cooling water in hot rolling overall process,
It is effectively utilized the advantageous effect of stainless steel watch surface oxidation film, oxidation film is avoided and is lost too early because of external force and caused by expanding with heat and contract with cold
Effect, while reducing water consumption.
3. the present invention reduces F1-F4 rack reduction ratio, by optimization workpiece thickness to reduce roll-substrate contact table
Surface pressure has been prevented from the premature failure of surface film oxide and steel matrix, also prevents stocking partial failure, reduces roll
Consumption.
4. the present invention effectively reduces hot roll mark depth of defect, it is strong to greatly reduce the grinding of later process surface defect
Degree reduces roller consumption.
Detailed description of the invention
Fig. 1 is the relationship of the present invention lower machine roll surface roughness and rack reduction ratio.
Fig. 2 is that the embodiment of the present invention 1, embodiment 5 and 1,2,3 steel slab surface of comparative example aoxidize environmental microbes photo.
Fig. 3 is the sectional view of Fig. 2 steel slab surface oxidation film.
Fig. 4 is the hot roll mark depth of defect photo of 1 steel of comparative example.
Fig. 5 is the hot roll mark depth of defect photo of 3 steel of comparative example.
Fig. 6 is the hot roll mark depth of defect photo of the embodiment of the present invention 1.
Fig. 7 is the hot roll mark depth of defect photo of 5 steel of the embodiment of the present invention.
Fig. 8 is that 1 heat of the embodiment of the present invention moves back steel surface pattern photo after pickling.
Fig. 9 is that 3 heat of comparative example moves back steel surface pattern photo after pickling.
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention will be further described.
The embodiment of the present invention is using high-chrome super-purity ferrite stainless steel in conventional manufacturing method generation, in the fabrication process
Control:
1) heating of plate blank: heating temperature is 1150~1200 DEG C, 180~230min of heating time；
2) rough rolling step: using 7 passes, and workpiece thickness sets 30~35mm；
3) the finish rolling stage: each percentage pass reduction≤35% of F1-F4 machine.
Whole process closes slab de-scaling water installations, closes roughing and finish rolling de-scaling water, closing interstand cooling water.Concrete technology
Parameter is referring to table 1.
Further, ROLLING OIL is not used on the finish rolling stage, mm finishing mill unit.
Fig. 2 is that embodiment 1,5 and comparative example 1-3 steel slab surface aoxidize environmental microbes photo.
As shown in Figure 2, at 1050~1100 DEG C of heating temperature, the stainless steel oxidation film of generation is uneven, selective oxidation
Film stripping, such as A-C in Fig. 2；And under 1150 DEG C or more heating temperatures, stainless steel watch surface oxidation film uniform fold, such as D- in Fig. 2
E。
Fig. 3 is embodiment 1,5 and comparative example 1-3 slab surface oxidation film thickness and uniformity pair at different heating temperatures
Than figure.Shown in Fig. 3, in lower temperature heating, oxidation rate is relatively low, and oxidation film is thin and is easier to peel off, such as A-B in Fig. 3.
At 1100 DEG C, partial failure occurs for surface richness Cr oxidation film, the knob of oxides-containing iron is instead of formed, such as C in Fig. 3.With
Temperature further increase, oxidation rate increase, uniform oxidation film is formed, such as D-E in Fig. 3.
Fig. 4, Fig. 5 are respectively the hot-strip scanning electron microscope cross-section photograph for using comparative example 1, the rolling of 3 technique of comparative example.Such as
Fig. 4, Fig. 5 are as it can be seen that in belt steel surface oxide skin insertion stainless steel base.Power spectrum the result shows that, fault location is mainly iron and chromium
Oxide (grey), and carry a large amount of white particles in a strip shape secretly, ingredient is identical as matrix, shows to exist in the operation of rolling tight
The roll banding phenomenon of weight.Bonding defect is caused the reason is that middle high chromium content ferrite stainless steel elevated temperature strength is low, during the rolling process, matrix
Surface is easy to happen partial failure, the substrate fragment that failure fragment is bonded on roll, and is sticked on roll in rolling with
The operation of rolling be constantly pressed into substrate.Since operation of rolling temperature is higher, the substrate sticked out is aoxidized, and leads to oxide skin
In with the presence of matrix composition a large amount of particulate matters.Further, since the oxide skin of indentation is Nian Jie with matrix insecure, part indentation
Iron scale is fallen off during the rolling process, and the pit length of formation up to 100 μm or more, lead up to 50~60 μm by depth
Surfaces of Hot Rolled Strip is caused pit and strip defect occur.These defects carry stainless steel fragment secretly, are difficult in subsequent acid cleaning process
Pickling is easy to cause the oxygen of white skin volume (No.1 volumes) to sting defect, even if pickling is fallen, still leaves a large amount of pits (i.e. in belt steel surface
Oxygen is but), increase belt steel surface Cu Unfeigned degree, brings and seriously affect to cold rolling process.
Fig. 6, Fig. 7 are respectively the hot-strip scanning electron microscope section for using the embodiment of the present invention 1, the rolling of 5 technique of embodiment
Photo, by Fig. 6, Fig. 7 as it can be seen that belt steel surface oxide skin is uniform, flat, surface scale is charged into body depth less than 5 μm, this
Kind surface scale is very easy to pickling due to the stainless steel fragment not bonded.
Fig. 8 is the photo of the hot-strip pickled surface rolled using 3 technique of comparative example, and as seen from Figure 8, belt steel surface is deposited
In exhibiting high surface stain and pit, these " oxygen is stung " and " oxygen lacks " defect is particularly acute in edge.
Fig. 9 is the photo of the hot-strip pickled surface rolled using 1 technique of the embodiment of the present invention, and Fig. 9 is as it can be seen that strip table
Face does not find " oxygen is stung " and " oxygen lacks " defect, it is shown that the remarkable result of present invention reduction hot roll mark depth of defect.
Table 1
Claims (2)
1. a kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction comprising: in middle high chromium ultra pure iron
Without de-scaling and water cooling treatment in the hot rolling overall process of ferritic stainless steel, and control in course of hot rolling:
1) heating of plate blank: 1150~1200 DEG C of heating temperature, 180~230min of heating time；
2) 7 passage roughing, 30~35mm of workpiece thickness rough rolling step: are carried out；
3) the finish rolling stage: each percentage pass reduction≤35% of F1-F4 rack in F1~F7 rack.
2. the method for high-chrome super-purity ferrite stainless steel hot-rolling sticking defect, feature in reduction according to claim 1
It is, in the finish rolling stage, ROLLING OIL is not used in mm finishing mill unit.
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| CN201710889358.8A CN109550793A (en) | 2017-09-27 | 2017-09-27 | A kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction |
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| CN201710889358.8A CN109550793A (en) | 2017-09-27 | 2017-09-27 | A kind of method of high-chrome super-purity ferrite stainless steel hot-rolling sticking defect in reduction |
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Cited By (3)
| 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 |
| CN112845594A (en) * | 2020-12-28 | 2021-05-28 | 浦项(张家港)不锈钢股份有限公司 | Hot rolling production process of low-hardness ferrite stainless steel |
| CN113462967A (en) * | 2021-06-19 | 2021-10-01 | 山东盛阳金属科技股份有限公司 | 430 ferrite stainless steel and production process thereof |
-
2017
- 2017-09-27 CN CN201710889358.8A patent/CN109550793A/en active Pending
Cited By (4)
| 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 |
| 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 |
| CN112845594A (en) * | 2020-12-28 | 2021-05-28 | 浦项(张家港)不锈钢股份有限公司 | Hot rolling production process of low-hardness ferrite stainless steel |
| CN113462967A (en) * | 2021-06-19 | 2021-10-01 | 山东盛阳金属科技股份有限公司 | 430 ferrite stainless steel and production process thereof |
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Application publication date: 20190402 |