CN108262357A - One kind prevents hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method - Google Patents
One kind prevents hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method Download PDFInfo
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- CN108262357A CN108262357A CN201810003351.6A CN201810003351A CN108262357A CN 108262357 A CN108262357 A CN 108262357A CN 201810003351 A CN201810003351 A CN 201810003351A CN 108262357 A CN108262357 A CN 108262357A
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- hot rolling
- iron scale
- steel
- pickling
- exempting
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 109
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 56
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 48
- 238000005554 pickling Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000005098 hot rolling Methods 0.000 title claims abstract description 28
- 238000004299 exfoliation Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 34
- 239000000498 cooling water Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000000470 constituent Substances 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 8
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 7
- 239000011573 trace mineral Substances 0.000 claims description 6
- 235000013619 trace mineral Nutrition 0.000 claims description 6
- 230000003064 anti-oxidating effect Effects 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052710 silicon Inorganic materials 0.000 abstract description 7
- 239000010703 silicon Substances 0.000 abstract description 7
- 241000219307 Atriplex rosea Species 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 abstract description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- 239000011651 chromium Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 5
- 238000009628 steelmaking Methods 0.000 description 5
- 229910003430 FeCr2O4 Inorganic materials 0.000 description 2
- 229910052840 fayalite Inorganic materials 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- -1 Fe2+ ions Chemical class 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229940067573 brown iron oxide Drugs 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- B21B1/22—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 for rolling plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
-
- 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
-
- 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
-
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- 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
- B21B1/22—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 for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses one kind to prevent hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method, belongs to technical field of steel rolling.In this method Fe is adjusted by controlling silicon content between 0.28wt%~0.30wt%3O4With the composition and ratio of FeO, and the chromium of 0.200wt%~0.225wt% is added in prevent red scale.Simultaneously by optimizing temperature process parameter, one group of wind turbine, air quantity 40000m are increased in cooling procedure is batched3/ h, wind pressure 255Pa, to improve the cooldown rate in coiling process, so as to improve FeO to Fe in coiling process3O4Transformation efficiency.This method makes the Fe for exempting to generate in pickling steel3O4Content 4% or so, greatly improves its surface quality, effectively prevents hot rolling and exempt from pickling beam steel iron scale powdery exfoliation phenomenon, while improve the plasticity of iron scale in 80% or so, FeO contents.
Description
Technical field
The invention belongs to technical field of steel rolling, and being related to one kind prevents hot rolling from exempting from the stripping of pickling beam steel iron scale powdery
The method fallen.
Background technology
Exempt from " Tight Scale " steel plate that pickling steel or " black rust steel " concept source are proposed in SUMITOMO CHEMICAL metal, it is this
Steel is mainly with black Fe3O4Based on, have higher plasticity and with the ability that matrix steel is combined closely, be mainly used for automotive frame
The manufacturing.Because its iron scale in follow-up deep-processing process can be deformed with steel plate and not fallen off, therefore not needed to
Reach by pickling to remove oxide and exempt from pickling purpose.But it is opening flat aligning in use, will appear the oxygen of varying degree
Change iron sheet powdery exfoliation phenomenon, it is therefore desirable to take some measures to solve its powdery iron scale spallation problems.
Surface quality is more likely to using low silicon production strategy in order to control for current hot rolling industry, and reason is that element silicon can be with
Lead to the surface quality problems such as hot-strip generation red scale, and this phenomenon is particularly bright during high silicon iron hot rolling
Aobvious, the surface quality defects such as red rust are relatively difficult to remove caused by high silicon.Can be use up for guarantee strip property in this case can
The problems such as silicone content can be reduced or use other substitute elements, but consequently also will appear cost increase.Exempt from pickling steel for producing
It is also based on low silicon mostly, it is therefore an objective to want to be formed with Fe during beam steel3O4Based on iron scale, but silicone content is low
When can but make the inadequate dense uniform in iron scale surface of generation and powdery exfoliation occur, influence surface quality.
Show to influence beam steel oxidation film powdery exfoliation reason mainly to have the ingredient of steel according to current research data, batch
Temperature, mill speed, cooling condition etc..The focus for improving beam steel iron scale powdery exfoliation at present is mainly placed on raising
Iron scale adhesive force enables iron scale that plastic deformation occurs without in peeling with steel matrix.Pass through in the present invention
Appropriate element silicon is added to improve the iron scale powdery exfoliation phenomenon that pickling steel 610L is exempted from hot rolling, so as to form high strength and low cost
Steel, production and its brown iron oxide spallation problems to exempt from pickling beam steel provide theoretical foundation and are instructed with application.
Invention content
Due to when rolling beam steel, being covered in belt steel surface with powdery form after iron scale crushing, influencing
Strip surface quality, therefore the present invention proposes a kind of side for preventing its iron scale powdery exfoliation for exempting from pickling beam steel
Method.With ensure iron scale have the characteristics that not lose powder, plasticity it is high, while will not both be added to originally will not be to environment for this method
Have an adverse effect.
One kind prevents hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method, which is characterized in that passes through control
Crossbeam composition of steel and hot rolling time inside furnace, entry temperature at finishing, finishing temperature, coiling temperature reach anti-oxidation iron sheet powdery exfoliation
Purpose；The ingredient that pickling beam steel is exempted from the hot rolling is 0.09wt%≤C≤0.10wt%；1.52wt%≤Mn≤
1.55wt%；0.0085wt%≤P≤0.010wt%；0.001wt%≤S≤0.002wt%；0.045wt%≤Al≤
0.047wt%；Si contents are 0.28wt%~0.30wt%, and Cr contents are 0.200wt%~0.225wt%, remaining for iron and
Inevitably trace element；Thickness is 8~12mm.
Further, Si constituent content 0.28wt%~0.30wt% are controlled, to adjust Fe3O4With the composition and ratio of FeO,
Make Fe in iron scale3O4/ FeO ratios are 20~30.
Further, production craft step of the present invention is as follows：
1) the stove time is strict controlled in during hot rolling of steel billet as 180~210min；
2) entry temperature at finishing is less than 1030 DEG C, finishing temperature control at 870~900 DEG C, oiler temperature control 570~
600℃；
3) during de-scaling, a de-scaling, the double full input of secondary descaling steel, de-scaling water comes into operation between finishing mill rack；
4) cooling water of working roll two level automatically controls, and interstand cooling water comes into operation and increases water, and two level automatically controls.
Further, it batches in cooling procedure and adds one group of wind turbine, air quantity 40000m3/ h, wind pressure 255Pa.Pass through
The cooldown rate in coiling process is improved, to improve FeO to Fe3O4Transformation efficiency.
It is opening flat sampling after the completion of exempting from pickling automotive frame steel making and cooling down away from tail portion 0m, 8m, 16m, 24m and is inspecting powder by random samples
Shape iron scale scaling amount.
The method of the present invention carries out in terms of following two：
(1) exempt from pickling composition of steel
It is 0.28wt%~0.30wt% that Si constituent contents are controlled in the present invention, Cr constituent contents for 0.200wt%~
0.225wt%.Si elements, will be with wedge after melting since selective oxidation can form Fe2SiO4 on the interface of FeO and irony
Shape invades squama in irony, squama being made to become intricate with irony interface, and further oxidation will produce with pinned FeO
Raw red scale.Cr elements have good oxidation resistance, and oxide FeCr2O4 is generated earlier than Fe2SiO4, rich Cr
Oxide is entered with Fe oxides inside FeO phases, and Fe2+ ions are surrounded in oxidation process by FeCr2O4 islands, FeO layers
It is thinning therewith.So as to reduce the FeO of ferrous metasilicate institute pinning, it is therefore prevented that the generation of red scale.By controlling Si first
Cellulose content adjusts Fe3O4With the composition and ratio of FeO, make the Fe of generation3O4Content in 80% or so FeO contents 4% or so,
That is Fe in iron scale3O4/ FeO ratios are 20~30, improve the iron scale quality for exempting from pickling steel.
(2) cooling velocity is improved using wind turbine
Temperature process parameter is optimized in the present invention, one group of wind turbine is increased in cooling procedure is batched, air quantity is
40000m3/ h, wind pressure 255Pa, to improve the cooldown rate in coiling process.So as to improve FeO to Fe in coiling process3O4
Transformation efficiency, and then improve iron scale powdery exfoliation.
Present invention has the advantages that：Using 0.28wt%~0.30wt% silicon composition designs, appropriateness improves Si constituent contents
It improves the iron scale quality for exempting from pickling steel, and add Cr members usually to prevent the generation of red scale, makes surface quality
It is optimal.The broken of iron scale is avoided by " high temperature rolls soon ", promotes a large amount of Fe by " low temperature batches "3O4Life
Into.Fe is adjusted by controlling Si constituent contents3O4With the composition and ratio of FeO, make the Fe of generation3O4Content is in 80% or so FeO
Content is in 4% or so, i.e. Fe in iron scale3O4/ FeO ratios are 20~30, while one group is employed in cooling procedure is batched
Wind turbine, air quantity 40000m3/ h, wind pressure 255Pa.FeO is improved in curly course to Fe3O4's by improving cooldown rate
Transformation efficiency.Exempt from that pickling steel oxidation iron sheet is least easy to fall off, have the characteristics that not lose powder, plasticity is high using produced by the invention,
And reached standard of the beam steel iron scale thickness in 10um or so, meet the requirement for exempting from pickling beam steel.
Specific embodiment
Originally prevent hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method with reference to embodiment detailed description,
But the specific embodiment of this method is not limited to following embodiments.
Embodiment 1
The present embodiment includes the following steps successively：
It is C that production thickness, which is the ingredient that pickling beam steel is exempted from 8mm hot rollings,：0.0083wt%；Mn：0.726wt%；P：
0.0071wt%；S：0.0031wt%；Al：0.046wt%, wherein, the content that Si is strictly controlled in the present invention is
0.0152wt%, remaining trace element for iron and inevitably.
The stove time is strict controlled in during hot rolling of steel billet as 200min.
Entry temperature at finishing is less than 1030 DEG C, and finishing temperature control is at 880 DEG C, and oiler temperature control is at 580 DEG C.
During de-scaling, a de-scaling, the double full input of secondary descaling steel, de-scaling water comes into operation between finishing mill rack.
Cooling water of working roll two level automatically controls, and interstand cooling water comes into operation and increases water, and two level automatically controls.
It batches and slow cooling is used in cooling procedure.
It is opening flat sampling after the completion of exempting from pickling automotive frame steel making and cooling down according to tail portion 0m, 8m, 16m, 24m and is inspecting powder by random samples
Shape iron scale scaling amount, as shown in Table 1.
Embodiment 2
The present embodiment includes the following steps successively：
It is C that production thickness, which is the ingredient that pickling beam steel is exempted from 8mm hot rollings,：0.10wt%；Mn：1.55wt%；P：
0.012wt%；S：0.002wt%；Al：0.047wt%；Wherein, the content that Si is strictly controlled in the present invention is 0.297wt%,
Cr constituent contents are 0.225wt%, remaining trace element for iron and inevitably.
The stove time is strict controlled in during hot rolling of steel billet as 200min.
Entry temperature at finishing is less than 1030 DEG C, and finishing temperature control is at 880 DEG C, and oiler temperature control is at 580 DEG C.
During de-scaling, a de-scaling, the double full input of secondary descaling steel, de-scaling water comes into operation between finishing mill rack.
Cooling water of working roll two level automatically controls, and interstand cooling water comes into operation and increases water, and two level automatically controls.
It batches and slow cooling is used in cooling procedure.
It is opening flat sampling after the completion of exempting from pickling automotive frame steel making and cooling down according to tail portion 0m, 8m, 16m, 24m and is inspecting powder by random samples
Shape iron scale scaling amount, as shown in Table 1.
Embodiment 3
The present embodiment includes the following steps successively：
It is C that production thickness, which is the ingredient that pickling beam steel is exempted from 8mm hot rollings,：0.0083wt%；Mn：0.726wt%；P：
0.0071wt%；S：0.0031wt%；Al：0.046wt%, wherein, the content that Si is strictly controlled in the present invention is
0.0152wt%, remaining trace element for iron and inevitably.
The stove time is strict controlled in during hot rolling of steel billet as 200min.
Entry temperature at finishing is less than 1030 DEG C, and finishing temperature control is at 880 DEG C, and oiler temperature control is at 580 DEG C.
During de-scaling, a de-scaling, the double full input of secondary descaling steel, de-scaling water comes into operation between finishing mill rack.
Cooling water of working roll two level automatically controls, and interstand cooling water comes into operation and increases water, and two level automatically controls.
It batches and one group of wind turbine, air quantity 40000m is added in cooling procedure3/ h, wind pressure 255Pa,.
It is opening flat sampling after the completion of exempting from pickling automotive frame steel making and cooling down according to tail portion 0m, 8m, 16m, 24m and is inspecting powder by random samples
Shape iron scale scaling amount, as shown in Table 1.
Embodiment 4
The present embodiment includes the following steps successively：
It is C that production thickness, which is the ingredient that pickling beam steel is exempted from 8mm hot rollings,：0.10wt%；Mn：1.55wt%；P：
0.012wt%；S：0.002wt%；Al：0.047wt%；Wherein, the content that Si is strictly controlled in the present invention is 0.297wt%,
Cr constituent contents are 0.225wt%, remaining trace element for iron and inevitably.
The stove time is strict controlled in during hot rolling of steel billet as 200min.
Entry temperature at finishing is less than 1030 DEG C, and finishing temperature control is at 880 DEG C, and oiler temperature control is at 580 DEG C.
During de-scaling, a de-scaling, the double full input of secondary descaling steel, de-scaling water comes into operation between finishing mill rack.
Cooling water of working roll two level automatically controls, and interstand cooling water comes into operation and increases water, and two level automatically controls.
It batches and one group of wind turbine, air quantity 40000m is added in cooling procedure3/ h, wind pressure 255Pa.
It is opening flat sampling after the completion of exempting from pickling automotive frame steel making and cooling down according to tail portion 0m, 8m, 16m, 24m and is inspecting powder by random samples
Shape iron scale scaling amount, as shown in Table 1.
The one each position iron scale amount of coming off of table
Claims (4)
1. one kind prevents hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method, which is characterized in that big by controlling
Joist steel ingredient and hot rolling time inside furnace, entry temperature at finishing, finishing temperature, coiling temperature reach anti-oxidation iron sheet powdery exfoliation
Purpose；The ingredient that pickling beam steel is exempted from the hot rolling is 0.09wt%≤C≤0.10wt%；1.52wt%≤Mn≤
1.55wt%；0.0085wt%≤P≤0.010wt%；0.001wt%≤S≤0.002wt%；0.045wt%≤Al≤
0.047wt%；Si contents are 0.28wt%~0.30wt%, and Cr contents are 0.200wt%~0.225wt%, remaining for iron and
Inevitably trace element；Thickness is 8~12mm.
2. pickling beam steel iron scale powdery exfoliation method is exempted from hot rolling according to claim 1, it is characterised in that：
Si constituent content 0.28wt%~0.30wt% are controlled, to adjust Fe3O4With the composition and ratio of FeO, make Fe in iron scale3O4/
FeO ratios are 20~30.
3. according to claim 1 prevent hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method, feature
It is that production craft step is as follows：
1) the stove time is strict controlled in during hot rolling of steel billet as 180~210min；
2) entry temperature at finishing is less than 1030 DEG C, and finishing temperature control is at 870~900 DEG C, and oiler temperature control is 570~600
℃；
3) during de-scaling, a de-scaling, the double full input of secondary descaling steel, de-scaling water comes into operation between finishing mill rack；
4) cooling water of working roll two level automatically controls, and interstand cooling water comes into operation and increases water, and two level automatically controls.
4. according to claim 1 prevent hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method, feature
It is：It batches and one group of wind turbine, air quantity 40000m is added in cooling procedure3/ h, wind pressure 255Pa.
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| CN201810003351.6A CN108262357B (en) | 2018-01-03 | 2018-01-03 | One kind prevents hot rolling from exempting from pickling beam steel iron scale powdery exfoliation method |
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|---|---|---|---|---|
| JP2001293514A (en) * | 2000-04-12 | 2001-10-23 | Nippon Steel Corp | Highly efficient descaling method |
| JP4035117B2 (en) * | 2004-04-13 | 2008-01-16 | 新日本製鐵株式会社 | Hot rolling method for high Si content steel sheet with good surface properties |
| CN101856669A (en) * | 2010-06-02 | 2010-10-13 | 东北大学 | Control method of softness of oxide scales on surface of hot-rolling strip steel |
| CN105618507A (en) * | 2015-12-25 | 2016-06-01 | 首钢总公司 | Anti-stripping iron oxide scale structure on surface of hot rolled plate and control process for anti-stripping iron oxide scale structure |
| CN106119687A (en) * | 2016-06-28 | 2016-11-16 | 宝山钢铁股份有限公司 | A kind of great surface quality exempt from pickled hot strip steel and manufacture method thereof |
-
2018
- 2018-01-03 CN CN201810003351.6A patent/CN108262357B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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