CN106424193A - Manufacturing method of hot rolled strip steel of hypereutectoid spheroidized pearlite structure - Google Patents
Manufacturing method of hot rolled strip steel of hypereutectoid spheroidized pearlite structure Download PDFInfo
- Publication number
- CN106424193A CN106424193A CN201610834720.7A CN201610834720A CN106424193A CN 106424193 A CN106424193 A CN 106424193A CN 201610834720 A CN201610834720 A CN 201610834720A CN 106424193 A CN106424193 A CN 106424193A
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- CN
- China
- Prior art keywords
- rolling
- strip
- strip steel
- hypereutectoid
- finish rolling
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- 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
- B21B37/76—Cooling control on the run-out table
-
- 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
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The invention relates to a manufacturing method of hot rolled strip steel of a hypereutectoid spheoidized pearlite structure. The technological process comprises the steps that billet check is conducted, specifically, the billet is fed into a furnace to be heated to 1,000-1,150 DEG C; rough descaling, namely rough rolling is conducted; fine descaling, namely finish rolling is conducted; the finish rolling outlet temperature is controlled below the Acm line; the cooling speed of the strip steel is controlled after finish rolling is completed, and the strip steel curls at the temperature of 710-730 DEG C; and the strip steel is collected, packaged, then fed into a holding furnace for heat preservation for 1-2 hours at the temperature of 700-710 DEG C, and finally discharged from the furnace to be air-cooled. According to the manufacturing method of the hot rolled strip steel of the hypereutectoid spheoidized pearlite structure, the strip steel of the spheoidized pearlite structure is directly provided for a client, spheroidizing annealing is not needed by the client any more, the problem that since the client uses strip steel of different manufacturers and different batches, large difference exists in chemical composition and structure, the annealing structure is non-uniform, spheroidizing is incomplete, and products of a downstream client are instable are solved, and the shortcomings that in the prior art, the energy source is wasted, equipment investment and production cost is increased and the environment is polluted are overcome.
Description
Technical field
The invention belongs to technical field of steel rolling, it is incubated the phosphorus content of spheroidizing more than 0.9% mistake particularly to a kind of controlled rolling
Eutectoid steel spheroidizing pearlite tissue strip production method.
Background technology
Hypereutectoid steel, after hot rolling, forms lamellar pearlite+cementite tissue, intensity is big, hardness is high.Downstream user
Also surface defect to be eliminated through cold rolling it is therefore an objective to smooth finish surface using front, improve belt steel thickness precision.General downstream client
Technique be：Pickling-spheroidizing-cold rolling（To target thickness）- cutting-make finished product.The spheroidizing time is long, and general 10
More than hour.Costly, 150 yuan about of annealing cost per ton.Because the strip that client buys mostly is different manufacturers, difference batch
Secondary, chemical composition and tissue differences are big, and it is poor to easily cause the structural homogenity after annealing, typically can not nodularization completely, thus
The properties of product of downstream client can be caused unstable, have a strong impact on production and use.
Content of the invention
The goal of the invention of the present invention is to provide a kind of producer of hypereutectoid spheroidizing pearlite hot-strip for hot rolling producer
Method, the method directly provides the strip of spheroidizing pearlite tissue for client, and client does not need to carry out spheroidizing again.
The technical solution adopted in the present invention is：A kind of hypereutectoid spheroidizing pearlite hot-strip production method, described heat
The technological process rolling strip is steel billet-enter stove heat-thick dephosphorization-roughing-essence de-scaling-finish rolling-cooling-collecting packing-insulation-sky
Cold；
Comprise the following steps that：
（1）Steel billet checks；
（2）Steel billet enters stove heat, by heating steel billet to 1000-1150 degree；
（3）Thick dephosphorization, steel billet of coming out of the stove enters dephosphorization case, removes the iron oxide on surface with water under high pressure；
（4）Roughing rolls, and rolling on edge controls width, and flat-rolled rolls thin one-tenth slab；
（5）Smart dephosphorization, removes, with water under high pressure, the secondary oxidation iron being formed in the operation of rolling；
（6）Finish rolling rolls, and rolling on edge controls strip width, and multi-pass flat-rolled rolls thin one-tenth goal standard；
（7）Control exit temperature at finishing in AcmBelow line；
（8）Strip controls cooling velocity after going out finish rolling, and temperature crimps between 710-730 DEG C；
（9）700-710 DEG C of insulation 1-2 hour of holding furnace, air cooling of coming out of the stove is entered after collecting packing.
Preferably：Exit temperature at finishing controls in Acm20-40 DEG C below line.
Preferably：Exit temperature at finishing controls in Acm20-30 DEG C below line.
Preferably：After finish rolling at strip, quickly cooled down by way of water-cooled, during when the temperature to 710-730 DEG C
It is crimped pack.
This hypereutectoid spheroidizing pearlite hot-strip working system disclosed in this invention, directly provides nodularization pearl for client
Light strip body, client is no longer necessary to carry out spheroidizing, solves client and uses different manufacturers, different batches strip, chemistry becomes
Point and tissue differences big, annealed structure is uneven, can not nodularization, downstream client completely the unstable problem of properties of product, gram
Take and wasted the energy in prior art, increase the problems such as equipment investment and production cost and environmental pollution, entered using hot rolling waste heat
Row heat treatment, reduces production cost, ton steel heat treatment expense can reduce about 100 yuan.
Brief description
Fig. 1 is the process chart of the temperature and time relation of the present invention.
Specific embodiment
It is described further with the present invention below in conjunction with the accompanying drawings.
Disclosed in this invention is a kind of hypo eutectoid spheroidizing pearlite strip production method.Through rolling that repetition test determines
Steel technological process is：Steel billet-enter stove heat-thick dephosphorization-roughing-essence de-scaling-finish rolling-cooling-collecting packing-insulation-air cooling, its
Main concrete technology flow process is as shown in Figure 1.
Comprise the following steps that：
1st, steel billet inspection；
2nd, steel billet enters stove heat, by heating steel billet to 1000-1150 degree；
3rd, thick dephosphorization, steel billet of coming out of the stove enters dephosphorization case, removes the iron oxide on surface with water under high pressure；
4th, roughing rolling, rolling on edge controls width, and flat-rolled rolls thin one-tenth slab；
5th, smart dephosphorization, removes, with water under high pressure, the secondary oxidation iron being formed in the operation of rolling；
6th, finish rolling rolling, rolling on edge controls strip width, and multi-pass flat-rolled rolls thin one-tenth goal standard；
7th, control exit temperature at finishing in AcmBelow line；
8th, cooling velocity is controlled to crimp between 710-730 DEG C after strip goes out finish rolling；
9th, 700-710 DEG C of insulation 1-2 hour of holding furnace, air cooling of coming out of the stove are entered after collecting packing.
Preferably, exit temperature at finishing controls in Acm20-40 DEG C below line.Preferably by exit temperature at finishing control
System is in Acm20-30 DEG C below line.
In preparation process, described water under high pressure dephosphorization it is simply that being sprayed against in surface of the work with high pressure nozzle, by its surface
Phosphorus wash away.
Preferably, on the rollgang between finish rolling to curling, the front half section setting water-cooled dress of rollgang
Put, stay-warm case was set above the second half section of rollgang, by adjusting water-cooled segment length and stay-warm case length, control coiling temperature
Between 710-730 DEG C.
Belt steel rolling：Qualified steel billet is pushed heating, heating steel billet to 1000-1150 degree in heating furnace, austenite is equal
Even；The steel billet heating is come out of the stove, through thick dephosphorization case, removes the iron oxide on surface with water under high pressure；Enter roughing and be rolled into and meet
Width, thickness requirement slab；Enter back into smart dephosphorization, after removing the secondary oxidation iron being formed in the operation of rolling, enter finish rolling, rolling
Become the strip of the one fixed width conforming to quality requirements and thickness.
Temperature control：Using temperature-controlled rolling, control exit temperature at finishing in AcmThe following austenite of line, cementite two-phase section knot
Bundle rolling, optimum temperature controls in AcmBelow line between 20-30 DEG C, by adjusting water-cooled segment length and stay-warm case length, control
Belt steel temperature is implemented to crimp between 710-730 DEG C.After strip curling packaging, it is directly entered 700-710 DEG C of insulation 1-2 of holding furnace
Hour, air cooling of coming out of the stove, during being incubated in this holding furnace, band coil of strip completes insulation, spheroidizing is processed, and it is come out of the stove after air cooling
Product be the strip of the spheroidizing pearlite tissue that client provides, client do not need to carry out again when using the heating to strip-
Spheroidizing, saves heat time and heating medium, and annealing furnace heating power can reduce by 50% than cold charge annealing furnace.
This hypereutectoid spheroidizing pearlite hot-strip working system disclosed in this invention, is using hot rolling waste heat（Remove
Cooling treatment after finish rolling, by strip after 710-730 DEG C of curling is collected, is directly placed into annealing furnace（I.e. holding furnace）Process,
During this period, band coil of strip progressively achieves spheroidizing in cooling procedure and processes, and its product of coming out of the stove is spheroidizing pearlite tissue
Strip）, save substantial amounts of heating expense.Employ two-phase section rolling during hot rolling and be conducive to pearlitic spheroidization, the operation of rolling
In cementite separate out, promote nodularization process, greatly reduce the nodularization time, improve the efficiency of nodularization and the complete of nodularization
Rate, solves client and uses different manufacturers, different batches strip, chemical composition and tissue differences big, annealed structure is uneven, no
Can completely nodularization, downstream client the unstable problem of properties of product.Using hypereutectoid spheroidizing pearlite hot-strip of the present invention
The hypereutectoid spheroidizing pearlite strip that working system produces, fully meets customer requirement.
Claims (4)
1. kind of hypereutectoid spheroidizing pearlite hot-strip production method it is characterised in that：The technological process of described hot-strip is
Steel billet-enter stove heat-thick dephosphorization-roughing-essence de-scaling-finish rolling-cooling-collecting packing-insulation-air cooling；
Comprise the following steps that：
Steel billet checks；
Steel billet enters stove heat, by heating steel billet to 1000-1150 degree；
Thick dephosphorization, steel billet of coming out of the stove enters dephosphorization case, removes the iron oxide on surface with water under high pressure；
Roughing rolls, and rolling on edge controls width, and flat-rolled rolls thin one-tenth slab；
Smart dephosphorization, removes, with water under high pressure, the secondary oxidation iron being formed in the operation of rolling；
Finish rolling rolls, and rolling on edge controls strip width, and multi-pass flat-rolled rolls thin one-tenth goal standard；
Control exit temperature at finishing in AcmBelow line；
Strip controls cooling velocity after going out finish rolling, and temperature crimps between 710-730 DEG C；
700-710 DEG C of insulation 1-2 hour of holding furnace, air cooling of coming out of the stove is entered after collecting packing.
2. hypereutectoid spheroidizing pearlite hot-strip production method according to claim 1 is it is characterised in that finish rolling exports
Temperature control is in Acm20-40 DEG C below line.
3. hypereutectoid spheroidizing pearlite hot-strip production method according to claim 1 is it is characterised in that finish rolling exports
Temperature control is in Acm20-30 DEG C below line.
4. hypereutectoid spheroidizing pearlite hot-strip production method according to claim 1 it is characterised in that at strip essence
After rolling, quickly cooled down by way of water-cooled, when the temperature to when 710-730 DEG C, it is crimped pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610834720.7A CN106424193B (en) | 2016-09-21 | 2016-09-21 | Hypereutectoid spheroidizing pearlite hot-strip production method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610834720.7A CN106424193B (en) | 2016-09-21 | 2016-09-21 | Hypereutectoid spheroidizing pearlite hot-strip production method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106424193A true CN106424193A (en) | 2017-02-22 |
| CN106424193B CN106424193B (en) | 2018-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610834720.7A Active CN106424193B (en) | 2016-09-21 | 2016-09-21 | Hypereutectoid spheroidizing pearlite hot-strip production method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355496A (en) * | 2021-06-04 | 2021-09-07 | 东北大学 | On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11290917A (en) * | 1998-04-08 | 1999-10-26 | Kawasaki Steel Corp | Hot finish rolling method of steel strip |
| JP2004099984A (en) * | 2002-09-10 | 2004-04-02 | Jfe Steel Kk | Hot-rolled steel strip manufacturing method and hot-rolled steel strip manufacturing facility |
| CN100999775A (en) * | 2006-09-27 | 2007-07-18 | 马鞍山钢铁股份有限公司 | Medium carbon steel on-line balling rolling tech. |
| 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 |
| CN102703803A (en) * | 2012-04-27 | 2012-10-03 | 宝山钢铁股份有限公司 | Globular pearlite type hot rolled coil and production method thereof |
| CN104745787A (en) * | 2015-04-14 | 2015-07-01 | 武汉钢铁(集团)公司 | Production method of tool steel capable of being directly cold rolled |
| CN105018835A (en) * | 2015-08-24 | 2015-11-04 | 武汉钢铁(集团)公司 | Medium-high carbon hot rolled strip steel with excellent fine blanking performance and production method |
-
2016
- 2016-09-21 CN CN201610834720.7A patent/CN106424193B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11290917A (en) * | 1998-04-08 | 1999-10-26 | Kawasaki Steel Corp | Hot finish rolling method of steel strip |
| JP2004099984A (en) * | 2002-09-10 | 2004-04-02 | Jfe Steel Kk | Hot-rolled steel strip manufacturing method and hot-rolled steel strip manufacturing facility |
| CN100999775A (en) * | 2006-09-27 | 2007-07-18 | 马鞍山钢铁股份有限公司 | Medium carbon steel on-line balling rolling tech. |
| 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 |
| CN102703803A (en) * | 2012-04-27 | 2012-10-03 | 宝山钢铁股份有限公司 | Globular pearlite type hot rolled coil and production method thereof |
| CN104745787A (en) * | 2015-04-14 | 2015-07-01 | 武汉钢铁(集团)公司 | Production method of tool steel capable of being directly cold rolled |
| CN105018835A (en) * | 2015-08-24 | 2015-11-04 | 武汉钢铁(集团)公司 | Medium-high carbon hot rolled strip steel with excellent fine blanking performance and production method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113355496A (en) * | 2021-06-04 | 2021-09-07 | 东北大学 | On-line solution annealing process for rolling waste heat of stainless steel hot-rolled coil |
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| CN106424193B (en) | 2018-08-03 |
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