CN109513744A - A kind of high carbon tool steel hot-rolling method - Google Patents
A kind of high carbon tool steel hot-rolling method Download PDFInfo
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- CN109513744A CN109513744A CN201811302349.5A CN201811302349A CN109513744A CN 109513744 A CN109513744 A CN 109513744A CN 201811302349 A CN201811302349 A CN 201811302349A CN 109513744 A CN109513744 A CN 109513744A
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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
- 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
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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Abstract
The present invention provides a kind of high carbon tool steel hot-rolling methods, the following steps are included: the slab after casting is offline is directly loadable into hot-rolling heating furnace or carries out isothermal holding to cast rear offline slab, so that the cooling velocity of slab is less than or equal to 3 DEG C/min, the charging temperature for controlling slab is greater than or equal to 300 DEG C, and tapping temperature is less than or equal to 1260 DEG C；During heating of plate blank, preheating section temperature is 800 DEG C~1100 DEG C, and preheating time is 0.3~1.2h, and the heating speed of bringing-up section is 5~15 DEG C/min, and slab is 0.3~1.2h in the soaking zone time；Roughing, is 35mm-45mm by the workpiece thickness that roughing obtains, and roughing finishing temperature is 1020-1060 DEG C；Finish rolling, the inlet temperature of the finish rolling are 850-1150 DEG C, and the rolling temperature of the finish rolling is 820-920 DEG C, in finish rolling, plate face everywhere temperature difference less than 20 DEG C；It cools down and rolls into coil of strip.Which raises lumber recoverys, shorten the production cycle, reduce production cost.
Description
Technical field
The invention belongs to technical field of steel rolling more particularly to a kind of high carbon tool steel hot-rolling methods.
Background technique
High carbon tool steel is that the steel for being widely used in the components such as automobile or hardware are made due to the requirement of application field
The requirement obtained to its surface quality is also very high.The linear upwarping defect that steel edge portion occurs after hot rolling is that one kind seriously affects its table
The common deficiency of face quality, the defect have larger impact to subsequent technique and product quality, can be cold if there is the defect
Occurs serious line defect when rolling, the wiping that these serious upwarping defects also will cause cold rolling contact roller scratches.
Currently, mostly being removed by modes such as machinings after upwarping defect generation and sticking up skin.For example, by hot-strip edge
Skin is stuck up in pickling trimming, is rolled after excision, still, due to sticking up skin positional distance edge farther out, is even up to sometimes
35mm or so needs trimming twice that can just cut away, and will cause biggish waste of material using this method, influences lumber recovery.It is existing
Also eliminated by the way of polishing slab corner in technology and stick up skin, i.e., by the corner of slab be polished into after fillet again into
Row rolling, still, the processing cost of this method is larger, and seriously affects rhythm of production, and the production cycle is longer.
Summary of the invention
The purpose of the present invention is at least solving one of above-mentioned problems of the prior art, which is by following skill
Art scheme is realized.
In order to achieve the above object, the present invention adopts the following technical scheme: a kind of high carbon tool steel hot-rolling method, including with
Lower step:
Offline slab after cast is kept the temperature so that the cooling velocity of slab be less than or equal to 3 DEG C/min or
Hot-rolling heating furnace is directly loadable into after slab is offline；
The charging temperature for controlling slab is greater than or equal to 300 DEG C, heats to the slab after heat preservation, tapping temperature is less than
Or it is equal to 1260 DEG C；During heating of plate blank, preheating section temperature is 800 DEG C~1100 DEG C, and preheating time is 0.3~1.2h, is added
The heating speed of hot arc is 5~15 DEG C/min, and slab is 0.3~1.2h in the soaking zone time；
To the slab rough rolling after heating, obtain intermediate base, intermediate base with a thickness of 35mm-45mm, roughing finishing temperature is
1020-1060℃；
Finish rolling is carried out to the intermediate base, the inlet temperature of finish rolling is 850-1150 DEG C, and the rolling temperature of finish rolling is 820-
920 DEG C, in finish rolling, plate face everywhere temperature difference less than 20 DEG C；
Section cooling is carried out to the steel band after finish rolling and rolls into coil of strip, obtains the high carbon tool steel.
The high carbon tool steel hot-rolling method by whole process hot rolling technology carry out process optimization, to tapping temperature, RT2,
The technological parameters such as entry temperature at finishing, finishing temperature are made adjustment and are optimized, and each process section temperature of skin is stuck up for influence edge
Strict control is carried out, to realize evading for tool steel edge upwarping defect in process stage, and then after overcoming
The defect that waste of material caused by skin is stuck up in continuous machining removal and processing cost is high, the production cycle is long, improves lumber recovery, contracts
The short production cycle, reduce production cost.
Further, preheating section temperature is 900 DEG C~1000 DEG C, and preheating time is 0.5~1.0h, the heating speed of bringing-up section
Degree is 5~15 DEG C/min, and slab is 0.5~1.0h in the soaking zone time.
Further, slab is 1.3~1.8h in the process time of the bringing-up section.
Further, in the finish rolling step, the inlet temperature of the finish rolling is 900-1050 DEG C, the finish rolling
Rolling temperature is 840-890 DEG C.
It further, further include thick de-scaling step after the heating of plate blank step, before the roughing step, to go
Except the iron scale of steel slab surface.
It further, also successively include flying shear step, essence end to end after the roughing step, before the finish rolling step
De-scaling step, to remove the intermediate Head and Tail Shape irregularities of base and the iron scale on surface.
Further, it the cooling and rolls into coil of strip and successively includes section cooling, coils into coil of strip, coiled sheet slow cooling.
Detailed description of the invention
Fig. 1 is a kind of process flow chart of specific embodiment of high carbon tool steel hot-rolling method provided by the invention；
Fig. 2 is the process flow chart of high carbon tool steel hot-rolling method another kind specific embodiment provided by the present invention.
Specific embodiment
The present invention provides a kind of high carbon tool steel hot-rolling methods, to solve in the prior art subsequent need to machine
Except the technical problem for sticking up waste of material caused by skin and processing cost is high, the production cycle is long.
In a specific embodiment, as shown in Figure 1, high carbon tool steel hot-rolling method provided by the invention, including with
Lower step:
S101: slab heat preservation carries out isothermal holding to cast rear offline slab, so that the cooling velocity of slab is less than
Or be equal to 3 DEG C/min or slab it is offline after be directly loadable into hot-rolling heating furnace.Offline temperature of the slab in a upper procedure is logical
Often at 700 DEG C or so, when having straight dress condition, heating furnace can be directly filled after slab is offline and is kept the temperature, if not having heat
Dress condition can be introduced into holding pit heat preservation, subsequent charging temperature need to be guaranteed at 300 DEG C or more after slab is offline.High carbon steel sheet
Base temperature drop is too fast to be easy to produce internal stress, causes slab cracked, seriously affects strip surface quality and rolling stability, because
This answers strict control slab cooling rate in insulating process, and cooling rate is controlled in 3 DEG C/min or less.
S102: the charging temperature for controlling slab is greater than or equal to 300 DEG C, heats to the slab after heat preservation, out furnace temperature
Degree is less than or equal to 1260 DEG C；During heating of plate blank, preheating section temperature be 800 DEG C~1100 DEG C, preheating time be 0.3~
1.2h, the heating speed of bringing-up section are 5~15 DEG C/min, and slab is 0.3~1.2h in the soaking zone time.It should be understood that
Slab includes two stages during heating, is followed successively by preheating section and soaking zone.
Preferably, in the heating of plate blank step, preheating section temperature is 900 DEG C~1000 DEG C, preheating time 0.5
~1.0h, the heating speed of bringing-up section are 5~15 DEG C/min, and slab is 0.5~1.0h in the soaking zone time；Slab adds described
The process time of hot arc is 1.3~1.8h；The inlet temperature of finish rolling is 900-1050 DEG C, and the rolling temperature of the finish rolling is 840-
890℃。
In order to avoid slab is heated rapidly in heating of plate blank and generates larger internal stress, it is necessary to assure steel billet enters furnace
Temperature is at 300 DEG C or more.Meanwhile during heating of plate blank, the temperature of strict control preheating section at 900-1000 DEG C, avoid into
The heating of furnace plate base is too fast, causes slab internal stress excessive.It is controlled in strict accordance with each time of heating furnace, time inside furnace cannot
It is too long, to avoid slab in heating furnace long-time heating heat preservation caused by austenite grain sharply grow up, grain coarsening it is big,
To guarantee the plasticity of slab, its crack tendence is reduced, so that reducing corner under the effect of subsequent rolling stress and generating side
A possibility that portion's crackle.Also, during heating of plate blank, slab heating temperature and tapping temperature cannot be excessively high, to avoid mistake
High corner (austenite) is thicker, and the thermoplasticity of slab is deteriorated caused by coarse grains, to further decrease subsequent rolling
A possibility that skin is stuck up in coiled sheet two sides occurs when processed.In addition, tapping temperature control is at 1120-1160 DEG C, coiled sheet sticks up the generation of skin
Rate can be effectively reduced.
S103: roughing is 35mm-45mm by the workpiece thickness that roughing obtains, and RT2 (i.e. roughing finishing temperature) is
1020-1060℃；Reasonable workpiece thickness is set for hot rolling rollback request thickness to guarantee that finish rolling area compresses are controlled than respectively
System is in 80-94%, it is desirable that workpiece thickness 35-45mm, if workpiece thickness is blocked up, band hardness of steel is higher, and each rack of finish rolling is negative
Lotus is excessive to cause rolling unstable；If workpiece thickness is excessively thin, intermediate base length is too long, then intermediate base tail portion temperature drop is excessive, in tail
Portion's roll-force surges, and easily causes steel scrap.
S104: finish rolling, the inlet temperature of the finish rolling are 850-1150 DEG C, and the rolling temperature of the finish rolling is 820-920
DEG C, in finish rolling, workpiece plate face everywhere temperature difference less than 20 DEG C；The inlet temperature of finish rolling should be at 1050 DEG C hereinafter, finishing temperature
It should be at 850 DEG C or more.There are high-temperature brittlenesses, strip plasticity to be deteriorated for strip when temperature is higher than 1050 DEG C or lower than 840 DEG C, easily
Edge fault out.For the uniformity for guaranteeing entire volume strip, strip terminates from roughing to finish rolling entrance, and Yao Caiyong insulation cover is protected
Temperature guarantees temperature transverse temperature uniformity.To guarantee logical volume temperature uniformity, increasing speed rolling is carried out after rolling 300m, is avoided
Second half section temperature is too low, and especially corner temperature drop is larger, easily falls into 840 DEG C hereinafter, there is edge upwarping defect.
S105: cooling simultaneously rolls into coil of strip.Section cooling is carried out to the steel band after finish rolling and rolls into coil of strip, obtains institute
State high carbon tool steel.
In another embodiment specific implementation mode, as shown in Fig. 2, high carbon tool steel hot-rolling method provided by the invention, including
Following steps:
S201: being directly loadable into hot-rolling heating furnace after slab heat preservation or slab are offline, to offline slab after cast into
Row isothermal holding, so that the cooling velocity of slab is less than or equal to 3 DEG C/min.Offline temperature of the slab in a upper procedure
Usually at 700 DEG C or so, when having straight dress condition, heating furnace can be directly filled after slab is offline and is kept the temperature, if not having
Hot charging condition can be introduced into holding pit heat preservation, subsequent charging temperature need to be guaranteed at 300 DEG C or more after slab is offline.High-carbon steel
Slab temperature drop is too fast to be easy to produce internal stress, causes slab cracked, seriously affects strip surface quality and rolling stability,
Therefore in insulating process, strict control slab cooling rate is answered, cooling rate is controlled in 3 DEG C/min or less.
S202: the charging temperature for controlling slab is greater than or equal to 300 DEG C, heats to the slab after heat preservation, out furnace temperature
Degree is less than or equal to 1260 DEG C；During heating of plate blank, preheating section temperature be 900 DEG C~1000 DEG C, preheating time be 0.5~
1.0h, the heating speed of bringing-up section are 5~15 DEG C/min, and the heating speed of bringing-up section is 5~15 DEG C/min, and slab is in soaking
The section time is 0.5~1.0h.
In order to avoid slab is heated rapidly in heating of plate blank and generates larger internal stress, it is necessary to assure steel billet enters furnace
Temperature is at 300 DEG C or more.Meanwhile during heating of plate blank, the temperature of strict control preheating section at 900-1000 DEG C, avoid into
The heating of furnace plate base is too fast, causes slab internal stress excessive.It is controlled in strict accordance with each time of heating furnace, time inside furnace cannot
It is too long, to avoid slab in heating furnace long-time heating heat preservation caused by austenite grain sharply grow up, grain coarsening it is big,
To guarantee the plasticity of slab, its crack tendence is reduced, so that reducing corner under the effect of subsequent rolling stress and generating side
A possibility that portion's crackle.Also, during heating of plate blank, slab heating temperature and tapping temperature cannot be excessively high, to avoid mistake
High corner (austenite) is thicker, and the thermoplasticity of slab is deteriorated caused by coarse grains, to further decrease subsequent rolling
A possibility that skin is stuck up in coiled sheet two sides occurs when processed.In addition, tapping temperature control is at 1120-1160 DEG C, coiled sheet sticks up the generation of skin
Rate can be effectively reduced.
S203: thick de-scaling, to remove the iron scale of steel slab surface.
S204: roughing, is 35mm-45mm by the workpiece thickness that roughing obtains, and roughing finishing temperature is 1020-1060
℃；Reasonable workpiece thickness is set for hot rolling rollback request thickness to guarantee that finish rolling area compresses are controlled than respectively in 80-
94%, it is desirable that workpiece thickness 35-45mm, if workpiece thickness is blocked up, band hardness of steel is higher, and each rack load of finish rolling is excessive
Cause rolling unstable；If workpiece thickness is excessively thin, intermediate base length is too long, then intermediate base tail portion temperature drop is excessive, rolls in tail portion
Power surges, and easily causes steel scrap.
S205: flying shear end to end, removes the Head and Tail Shape irregularities of intermediate base.
S206: smart de-scaling step, to remove the iron scale on intermediate base surface.
S207: finish rolling, the inlet temperature of the finish rolling are 850-1150 DEG C, and the rolling temperature of the finish rolling is 820-920
DEG C, in finish rolling, the plate face of the slab everywhere temperature difference less than 20 DEG C.For the uniformity for guaranteeing entire volume strip, strip is from thick
To finish rolling entrance, Yao Caiyong insulation cover is kept the temperature roll bonding beam, guarantees temperature transverse temperature uniformity.It is equal to keep the temperature logical volume temperature
Even property carries out increasing speed rolling after rolling 300m, avoids second half section temperature too low, and especially corner temperature drop is larger, easily falls into 840
DEG C hereinafter, there is edge upwarping defect.
S208: section cooling.
S209: coil of strip is coiled into.
S210: coiled sheet slow cooling.
High carbon tool steel hot-rolling method provided in above-mentioned each specific embodiment by whole process hot rolling technology into
Row process optimization makes adjustment to technological parameters such as tapping temperature, RT2, entry temperature at finishing, finishing temperature and cooling velocities
And optimization, each process section temperature progress strict control of skin is stuck up for edge is influenced, to realize in process stage
Tool steel edge upwarping defect is evaded, and then is overcome subsequent machining removal and stuck up waste of material caused by skin and be processed into
The defect of this height, production cycle length, improves lumber recovery, shortens the production cycle, reduce production cost.
Above-mentioned technical effect is verified in a manner of table comparison below, selects 0.65% tool steel of C content
65CrNi is as substrate.Table 1 is the strip surface quality situation table obtained using traditional handicraft, and hot rolling rear surface quality is equal
In upper surface two sides, there is edge upwarping defect in 8-25mm.Table 2 is the strip table obtained using hot-rolling method provided by the present application
Face quality condition table rolls up every volumes for these tests and carries out surface topography observation under table inspection, finds no edge and sticks up skin and deposits
Checking that coiled sheet quality is good after uncoiling.
The strip surface quality situation table that table 1 is obtained using traditional handicraft
The strip surface quality situation table that table 2 is obtained using hot-rolling method provided by the present application
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention
The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention
And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of high carbon tool steel hot-rolling method, which comprises the following steps:
Cast rear offline slab is kept the temperature, so that the cooling velocity of slab is less than or equal to 3 DEG C/min or slab
Hot-rolling heating furnace is directly loadable into after offline；
The charging temperature for controlling slab is greater than or equal to 300 DEG C, heats to the slab after heat preservation, tapping temperature is less than or waits
In 1260 DEG C；During heating of plate blank, preheating section temperature is 800 DEG C~1100 DEG C, and preheating time is 0.3~1.2h, bringing-up section
Heating speed be 5~15 DEG C/min, slab the soaking zone time be 0.3~1.2h；
To the slab rough rolling after heating, obtain intermediate base, intermediate base with a thickness of 35mm-45mm, roughing finishing temperature is 1020-
1060℃；
Finish rolling is carried out to the intermediate base, the inlet temperature of finish rolling is 850-1150 DEG C, and the rolling temperature of finish rolling is 820-920
DEG C, in finish rolling, plate face everywhere temperature difference less than 20 DEG C；
Section cooling is carried out to the steel band after finish rolling and rolls into coil of strip, obtains the high carbon tool steel.
2. high carbon tool steel hot-rolling method according to claim 1, which is characterized in that the preheating section temperature is 900 DEG C
~1000 DEG C, the preheating time is 0.5~1.0h, and the heating speed of bringing-up section is 5~15 DEG C/min, and slab is in soaking zone
Between be 0.5~1.0h.
3. high carbon tool steel hot-rolling method according to claim 1, which is characterized in that the slab is in the bringing-up section
Process time is specially 1.3~1.8h.
4. high carbon tool steel hot-rolling method according to claim 1, which is characterized in that described in the finish rolling step
The inlet temperature of finish rolling is 900-1050 DEG C, and the rolling temperature of the finish rolling is 840-890 DEG C.
5. high carbon tool steel hot-rolling method according to claim 1, which is characterized in that the heating of plate blank step it
Afterwards, before the roughing step further include:
Thick de-scaling step, to remove the iron scale of steel slab surface.
6. high carbon tool steel hot-rolling method according to claim 1, which is characterized in that after the roughing step, institute
Also successively include: before stating finish rolling step
Flying shear step, smart de-scaling step end to end, to remove the intermediate Head and Tail Shape irregularities of base and the iron scale on surface.
7. high carbon tool steel hot-rolling method according to claim 2, which is characterized in that the cooling and roll into coil of strip according to
It is secondary include section cooling, coil into coil of strip, coiled sheet slow cooling.
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| CN110238203A (en) * | 2019-06-13 | 2019-09-17 | 首钢集团有限公司 | A method of it eliminating hot rolling tool steel edge and sticks up skin |
| CN110388834A (en) * | 2019-07-29 | 2019-10-29 | 山东泰山钢铁集团有限公司 | A method of it improving steel plant and is heat-fed steel slab rate |
| CN111974801A (en) * | 2020-08-13 | 2020-11-24 | 无锡市城南带钢有限公司 | Method for producing hot-rolled strip steel |
| CN112676341A (en) * | 2020-12-03 | 2021-04-20 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling method of low-carbon steel |
| CN113106225A (en) * | 2021-03-31 | 2021-07-13 | 北京首钢股份有限公司 | Method for reducing intercrystalline oxidation depth of high-carbon tool steel |
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