CN106222385A - The production method of high carbon tool steel hot rolled steel sheet - Google Patents
The production method of high carbon tool steel hot rolled steel sheet Download PDFInfo
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- CN106222385A CN106222385A CN201610583801.4A CN201610583801A CN106222385A CN 106222385 A CN106222385 A CN 106222385A CN 201610583801 A CN201610583801 A CN 201610583801A CN 106222385 A CN106222385 A CN 106222385A
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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- 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
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- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses the production method of a kind of high carbon tool steel hot rolled steel sheet, belong to high carbon tool steel production technical field.The critical process of this production method controls to include: sheet blank continuous casting: the thickness of sheet billet is 50～90mm；It is 10～40 DEG C that continuous-casting steel pouring controls molten steel overheat；Cast pulling rate is 2.5～5.0m/min；Employing covering slag is poured into a mould, and the hemisphere fusing point of this covering slag is 845 ± 70 DEG C, and basicity is 0.85 ± 0.2, and viscosity is 1290～1310 DEG C: 0.80 ± 0.6 pool, and bulk density is 0.60 ± 0.4kg/L；Strand soaking: strand charging temperature is 800～1100 DEG C, tapping temperature is 1100 DEG C～1250 DEG C, and strand time inside furnace is 30～60min；Finish rolling: the 1st, 2 frame rolling reduction ratios control 40～60%, and finishing temperature is 850～950 DEG C；Section cooling: cooldown rate >=20 DEG C/s；Batch: coiling temperature is 550～700 DEG C.The hot rolled plate THICKNESS CONTROL that the present invention produces is between 1.5～3.0mm, and has the features such as segregation is little, decarburized layer is shallow, structure property is uniform.
Description
Technical field
The invention belongs to high carbon tool steel production technical field, more particularly to a kind of high carbon tool steel hot rolled steel sheet
Production method.
Background technology
High carbon tool steel has the feature of high intensity, high rigidity and high-wearing feature, is mainly used in making all kinds of cutting tool
And Special Tool, it is widely used in the fields such as papermaking, forestry, rubber, plastics, light textile, electrical equipment, light industry and machinery.
At present, the technological process of production of most high carbon tool steels is: molten iron → converter → LF refine → continuous casting → cooling →
Heating → rolling → section cooling → batch → finished product.
High-carbon steel C content is high, and steel billet, in process of setting, easily produces center segregation and center porosity, after rolling into material,
Easily there is lamination in coiled sheet centre.Secondly, strand structural stress and thermal stress when solidification is the biggest, high-temperature thermoplastic
Property relatively low, easily produce crack of billet and face crack.It addition, the freezing point of high-carbon steel is on the low side, crystallizer hot melt quantity is inclined
Little, conventional plate blank pulling speed of continuous casting is low, and crystallizer molten steel surface is inactive, and covering slag thaw condition is bad, and casting billet surface easily occurs
The defects such as slag inclusion.Therefore, the conventional line production high carbon tool steel that produces has certain limitation, is particularly difficult to produce C content big
In the high carbon tool steel hot rolled steel sheet of 0.80%.
In recent years, thin plate blank continuously casting and continuously rolling technology is developed rapidly, and also produces C content at this higher on product line
Product, such as Chinese invention patent application (application number: 200910041759.3, the applying date: 2009-08-10), discloses entitled one
Planting the patent documentation of the method producing medium-carbon steel hot-rolled steel sheet, this technology controlling and process is, the middle bag degree of superheat is 20～35 DEG C, cast
Pulling rate is 4～5m/min, uses wick-containing Reduction Technology, and pressure ratio is 6.6～13.3%, uses covering slag cast: basicity is
0.95 ± 0.1, viscosity is that 1.05 ± 0.1 (1300 DEG C) are moored, fusion point is 1020 ± 30 DEG C.The method is particularly suitable for use with rich
Sheet billet continuous casting flow process produces medium carbon steel hot rolled steel plate, and can produce carbon content in rich slab continuous casting rolling flow process by the method is
0.42～0.65%, there is plasticity good, hardness is high, after heat treatment has high performance medium-carbon steel hot-rolled steel sheet.
Chinese invention patent application (application number: 201010525184.5, the applying date: 2010-10-29), it was recently reported that a kind of
CSP produces the technique of medium and high carbon steel, and this technique uses continuous casting and rolling technique of sheet bar, by changing each operation
Technological parameter produces medium and high carbon steel.
Chinese invention patent application (application number: 201210193692.7, the applying date: 2012-06-13), discloses one
The preparation method of high carbon steel in composite microalloy, comprises the following steps: 1) configure according to the components by weight of following casting finished products
Raw material: C:0.51-0.54%, Mn:0.65～0.69%, Si:0.40～0.58%, Nb:0.03～0.07%, V:0.1～
0.13%, Cr:0.20～0.3%, P≤0.020%, S≤0.015%, surplus is Fe, 2) it is chosen at 0.75t intermediate frequency centreless sense
Answer melting in electric furnace, after being heated to 1100～1180 DEG C and being incubated 1 hour, forging molding；3) by step 2) obtain steel billet 850
～after 900 DEG C of normalizings are incubated 1 hour, carry out air cooling or water-spraying control to room temperature, it is ensured that rate of cooling controls 6-12 DEG C/s's
In the range of, it is ensured that room temperature texture is ferrite and pearlite.The medium-high carbon steel material containing Nb and V of the present invention have high intensity,
The mechanical property of high tenacity coordinates.
Chinese invention patent application (application number: 201310076240.5, the applying date: 2013-03-11), the present invention relates to
A kind of annealing-free medium-high carbon steel plate manufacturing process, belongs to steel rolling process technical field.Technical scheme is: comprises heating furnace and adds
Heat, edge rolling, roughing de-scaling, roughing rolling, intercooling, finish rolling de-scaling, finish rolling rolling, section cooling, coiling machine batch
With concentrate heap cooling working procedure, described intercooling operation, after slab carries out roughing rolling process, enter finish rolling de-scaling operation it
Before, by chiller, slab being cooled down, the cooling capacity of chiller makes slab be cooled to less than 840 DEG C.
Chinese invention patent application (application number: 201410553865.0, the applying date: 2014-10-17), it is provided that a kind of
The rolling mill practice of CSP medium and high carbon steel, its step includes: continuous casting, soaking, de-scaling, rolling, interstand cooling, layer
Stream cool down, batches, the operation of thermal insulation cover slow cooling, it is characterised in that: described rolling process include austenite perfect recrystallization roll,
Unhydrated cement ausrolling, two-phase section 3 stages of rolling.
Chinese invention patent application (application number: 201510928582.4, the applying date: 2015-12-15), discloses one
Sheet billet medium and high carbon steel production technology, is prepared from including by the chemical composition of following percentage by weight: carbon: 0.5～0.88%,
Silicon: 0.15～0.68%, manganese: 0.65～1.55%, phosphorus≤0.025%, sulfur: 0.002～0.0025%, chromium: 0.09～
0.22%, nickel: 0.08～0.12%, arsenic: 0.02～0.035%, copper: 0.18～0.20%, aluminum≤0.02% and surplus be ferrum,
Use continuous casting and rolling technique of sheet bar to produce medium and high carbon steel, by controlling each procedure technology parameter, produce and meet requirement.
Above-mentioned document is the most not mentioned produces C content 0.80～1.05%, Si content based on bar strip continuous casting and rolling flow path
0.10～0.30%, the method for thickness 1.5～3.0mm high carbon tool steel hot rolled steel sheet.
Summary of the invention
Object of the present invention is to provide the production method of a kind of high carbon tool steel hot rolled steel sheet, the hot rolled thin of production
Steel plate, C content 0.70～1.15%, Si content 0.050～0.35%, and THICKNESS CONTROL is between 1.5～3.0mm.This production
High carbon tool steel hot rolled steel sheet prepared by method has that segregation is light, and decarburized layer is shallow, structure property all with etc. feature.
For realizing the purpose of the present invention, the invention discloses the production method of a kind of high carbon tool steel hot rolled steel sheet, should
Production method includes that technological process is: desulfurizing iron, bessemerize, Argon, refine, sheet blank continuous casting, strand soaking, finish rolling,
Section cooling and batching, it is characterised in that: critical process controls to include:
Sheet blank continuous casting: the thickness of sheet billet is 50～90mm, it is 10～40 DEG C that continuous-casting steel pouring controls molten steel overheat, waters
Note pulling rate is 2.5～5.0m/min；
Employing covering slag is poured into a mould, and the hemisphere fusing point of this covering slag is 845 ± 70 DEG C, and basicity is 0.85 ± 0.2, and viscosity is
1290～1310 DEG C: 0.80 ± 0.6 pool, bulk density is 0.60 ± 0.4kg/L；
Strand soaking: strand charging temperature is 800～1100 DEG C, tapping temperature is 1100～1250 DEG C, and strand is when stove
Between be 30～60min；
Finish rolling: the rolling reduction ratio of the 1st frame and the 2nd frame all controls 40～60%, finishing temperature is 850～950
℃；
Section cooling: cooldown rate >=20 DEG C/s；
Batch: coiling temperature is 550～700 DEG C.
Further, critical process controls also to include the slow cooling after batching, and the coil of strip after batching uses in warehouse of steel roll
Way of stacking carries out slow cooling, and the slow cooling time controls to be 48～72h.
Yet further, in thin slab casting, the thickness of sheet billet is 50～70mm, and continuous-casting steel pouring controls molten steel
The degree of superheat is 15～35 DEG C, and cast pulling rate is 3.0～4.5m/min.
Further, in thin slab casting, the thickness of sheet billet is 50～60mm, and continuous-casting steel pouring controls molten steel
The degree of superheat is 15～20 DEG C, and cast pulling rate is 3.5～4.5m/min.
Further, using covering slag cast, the hemisphere fusing point of this covering slag is 845 ± 50 DEG C, basicity is 0.85 ±
0.1, viscosity is 1300 DEG C: 0.80 ± 0.5 pool, and bulk density is 0.60 ± 0.2kg/L.
Further, in strand uniform heating process, strand charging temperature is 850～1050 DEG C, and tapping temperature is 1130
～1150 DEG C, strand time inside furnace is 25～40min.
Further, in finish-rolling process, the 1st frame reduction ratio is 50～60%, the 2nd frame reduction ratio be 50～
60%, finishing temperature is 880～900 DEG C.
Further, coiling temperature is 610～650 DEG C.
Further, the chemical composition percentage ratio of the molten steel after described refining process carries out Alloying Treatment is: C:
0.70～1.15%, Si:0.050～0.35%, Mn:0.20～0.60%, P≤0.015%, S≤0.010%, N≤
0.008%, Cr:0.10～0.30%, Als:0.015～0.040%, remaining is Fe and inevitable impurity.
Further, the chemical composition percentage ratio of the molten steel after described refining process carries out Alloying Treatment is: C:
0.80～1.05%, Si:0.10～0.30%, Mn:0.20～0.60%, P≤0.015%, S≤0.010%, N≤
0.008%, Cr:0.10～0.30%, Als:0.015～0.040%, remaining is Fe and inevitable impurity.
The principle of the present invention:
1, the selection principle of various chemical compositions:
Carbon (C): carbon acts primarily as hardness and the effect of quenching degree improving steel in steel, and carbon content is too low, steel hardness
The lowest, steel is too soft.The problems such as carbon content is too high, and steel hardness is the highest, and the course of processing is the most cracking, processing characteristics is relatively
Difference.Therefore carbon content is 0.80～1.05%.
Silicon (Si): silicon plays the raising anti-relaxation ability of steel and resistance to tempering in steel, also functions to improve hardenability of steel
Effect.Si content is too low, and the anti-relaxation ability of steel is the least, and minimum Si content is 0.10%, Si too high levels, and the fragility of steel increases
Add, and the C graphitization that the highest Si is also easily caused in steel, high Si content are 0.30%.
Manganese (Mn): manganese acts hardness and the quenching degree improving steel in steel, the S in steel is combined formation MnS, improves steel
Toughness.Mn content is too low, and raising hardenability of steel effect is the most weak, and minimum Mn content is 0.20%, and Mn too high levels is held
Easily causing central segregation of slab in casting process, reduce the serviceability of material, high Mn content is 0.60%.
Phosphorus (P): in traditional view, phosphorus is belonging to harmful element in steel.It can reduce the impact flexibility of steel, improves steel
Brittle temperature, deteriorate the welding performance of steel, that is phosphorus and the coefficient result of carbon in fact.If removing the impact of carbon, phosphorus
Plasticity, toughness can also be made to increased, make brittle temperature decrease.Phosphorus is non-carbide former, its depositing in steel
Ferrite mainly it is dissolved in form.When ligancy is all 12, its atomic radius isBigger than iron atom
Therefore can replace iron atom when it is dissolved in ferrite and form substitution solid solution.Many solid in addition to carbon, nitrogen element
Solution is formed in element, and the solution strengthening ability of phosphorus is maximum.But the too high meeting of phosphorus content causes the plasticity of material, weldability and shaping
Property is unfavorable.Therefore, P content controls below 0.015%.
Sulfur (S): sulfur is harmful element.It is prone at Grain Boundary Segregation, affects the toughness of product, reduce corrosion resistance simultaneously.Cause
This must strictly limit sulfur content, and S content controls below 0.010%.
Nitrogen (N): nitrogen is the impurity element in steel, reduces the toughness of steel, it is easy to Al, Ti form AlN and TiN, content mistake
Height, is easily formed thick TiN, reduces its content the most as far as possible, and its value should be less than 0.008%.
Chromium (Cr): chromium can improve the quenching degree of steel, is conducive to improving hardness and the wearability of steel, is formed steady in steel
Determining carbide, improve the anti-temper resistance of steel, in the present invention, minimum is 0.10%, but Cr too high levels easily causes steel
Material much higher hard, toughness declines, and therefore peak is 0.30%.
Aluminum (Al): aluminum is combined with O in steel, primarily serves the effect of deoxidation, and therefore minimum content is 0.015%, and Al contains
Measuring too high easy formation continuous casting and produce difficulty, high-load is 0.040%.
2, the operation principle of production method of the present invention:
Preferred thickness of the present invention be 50～90mm sheet billet carry out smelting and being casting continuously to form base, continuous-casting steel pouring controls molten steel mistake
Temperature is 10～40 DEG C, and cast pulling rate is 2.5～5.0m/min；The hemisphere fusing point of cast covering slag is 845 ± 50 DEG C, and basicity is
0.85 ± 0.1, viscosity is 1290～1310 DEG C: 0.80 ± 0.5 pool, and bulk density is 0.60 ± 0.2kg/L.Continuous casting billet is carried out
During heating, controlling strand charging temperature is 800～1100 DEG C, and tapping temperature is 1100～1250 DEG C, and strand time inside furnace is 30
～60min.When rolling, finish rolling the 1st, 2 frame rolling reduction ratio controls 40～60%, and finishing temperature is 850～950
℃；Then carrying out section cooling, cooldown rate >=30 DEG C/s, then batch, coil of strip coiling temperature is 550～700 DEG C, finally
The mode using stacking slow cooling carries out slow cooling, and the control of slow cooling time is 48～72h, and the coil of strip thickness of production is 1.5～3.0mm.
Having the beneficial effects that of production method of the present invention:
The present invention is by controlling the work of the keys such as chemical composition and continuous casting process, heating technique, the rolling mill practice of steel
Skill process, the hot rolled steel plate THICKNESS CONTROL of production is between 1.5～3.0mm, and high carbon tool steel heat prepared by this production method
Rolling sheet metal, to have segregation light, and decarburized layer is shallow, structure property all with etc. feature.
Accompanying drawing explanation
Fig. 1 is the metallographic microstructure figure of the embodiment of the present invention 1；
Fig. 2 is the metallographic microstructure figure of the embodiment of the present invention 2；
Fig. 3 is the metallographic microstructure figure of the embodiment of the present invention 3；
Fig. 4 is the metallographic microstructure figure of the embodiment of the present invention 4；
Fig. 5 is the metallographic microstructure figure of the embodiment of the present invention 5.
Detailed description of the invention
In order to preferably explain the present invention, it is further elucidated with the main contents of the present invention below in conjunction with specific embodiment, but
Present disclosure is not limited solely to following example.
Embodiment 1
It is C:0.80% that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment, Si:0.25%, Mn:
0.60%, P:0.010%, S:0.008%, N:0.006%, Cr:0.20%, Als:0.035%, remaining is that Fe is with inevitable
Impurity.
This production method passes sequentially through desulfurizing iron → bessemerize → Argon → refine → continuous casting → soaking pit → finish rolling
→ section cooling → batch → slow cooling.
Main technologic parameters value: thickness of strand is 70mm, molten steel overheat is 35 DEG C, and pulling rate is 3.0m/min, casting
Base charging temperature is 850 DEG C, tapping temperature is 1100 DEG C, and strand time inside furnace is 60min, finish rolling the 1st frame rolling reduction ratio
40%, finish rolling the 2nd frame rolling reduction ratio 60%, finishing temperature is 950 DEG C, 30 DEG C/s of section cooling speed, and coiling temperature is
700℃。
The physical and chemical index of covering slag: hemisphere fusing point is 895 DEG C, basicity is 0.95, and viscosity is 0.82 pool (1300 DEG C),
Bulk density is 0.80kg/L.
Prepare metallographic microstructure figure hot-strip as shown in Figure 1；And the correlation performance parameters of this hot-strip
As shown in table 1.
The performance parameter of the hot-strip that table 1 embodiment 1 produces
Understanding in conjunction with Fig. 1 and Biao 1, the thickness of this hot-strip is 3.0mm, and inclusion behavior is D class, monolateral decarburized layer
The degree of depth has reached 0.82%, and from figure 1 it appears that this belt steel surface is organized without obvious band.
Embodiment 2
It is C:0.85% that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment, Si:0.25%, Mn:
0.50%, P:0.012%, S:0.006%, N:0.006%, Cr:0.30%, Als:0.040%, remaining is that Fe is with inevitable
Impurity.
This production method passes sequentially through desulfurizing iron → bessemerize → Argon → refine → continuous casting → soaking pit → finish rolling
→ section cooling → batch → slow cooling.
Main technologic parameters value: thickness of strand is 62mm, molten steel overheat is 30 DEG C, and pulling rate is 3.5m/min, casting
Base charging temperature is 900 DEG C, tapping temperature is 1130 DEG C, and strand time inside furnace is 50min, finish rolling the 1st frame rolling reduction ratio
45%, finish rolling the 2nd frame rolling reduction ratio 55%, finishing temperature is 930 DEG C, 40 DEG C/s of section cooling speed, and coiling temperature is
680℃。
The physical and chemical index of covering slag: hemisphere fusing point is 850 DEG C, basicity is 0.90, and viscosity is 0.85 pool (1300 DEG C),
Bulk density is 0.70kg/L.
Prepare metallographic microstructure figure hot-strip as shown in Figure 2；And the correlation performance parameters of this hot-strip
As shown in table 2.
The performance parameter of the hot-strip that table 2 embodiment 2 produces
Understanding in conjunction with Fig. 2 and Biao 2, the thickness of this hot-strip is 2.5mm, and inclusion behavior is D class, monolateral decarburized layer
The degree of depth has reached 0.75%.
Embodiment 3
It is C:0.90% that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment, Si:0.20%, Mn:
0.30%, P:0.010%, S:0.005%, N:0.007%, Cr:0.10%, Als:0.015%, remaining is that Fe is with inevitable
Impurity.
This production method passes sequentially through desulfurizing iron → bessemerize → Argon → refine → continuous casting → soaking pit → finish rolling
→ section cooling → batch → slow cooling.
Main technologic parameters value: thickness of strand is 60mm, molten steel overheat is 20 DEG C, and pulling rate is 3.8m/min, casting
Base charging temperature is 950 DEG C, tapping temperature is 1150 DEG C, and strand time inside furnace is 40min, finish rolling the 1st frame rolling reduction ratio
50%, finish rolling the 2nd frame rolling reduction ratio 50%, finishing temperature is 900 DEG C, 45 DEG C/s of section cooling speed, and coiling temperature is
650℃。
The physical and chemical index of covering slag: hemisphere fusing point is 795 DEG C, basicity is 0.80, and viscosity is 0.78 pool (1300 DEG C),
Bulk density is 0.60kg/L.
Prepare metallographic microstructure figure hot-strip as shown in Figure 3；And the correlation performance parameters of this hot-strip
As shown in table 3.
The performance parameter of the hot-strip that table 3 embodiment 3 produces
Understanding in conjunction with Fig. 3 and Biao 3, the thickness of this hot-strip is 2.3mm, and inclusion behavior is D class, monolateral decarburized layer
The degree of depth has reached 0.80%.
Embodiment 4
It is C:0.98% that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment, Si:0.10%, Mn:
0.20%, P:0.009%, S:0.006%, N:0.006%, Cr:0.25%, Als:0.030%, remaining is that Fe is with inevitable
Impurity.
This production method passes sequentially through desulfurizing iron → bessemerize → Argon → refine → continuous casting → soaking pit → finish rolling
→ section cooling → batch → slow cooling.
Main technologic parameters value: thickness of strand is 52mm, molten steel overheat is 15 DEG C, and pulling rate is 4.0m/min, casting
Base charging temperature is 1000 DEG C, tapping temperature is 1180 DEG C, and strand time inside furnace is 35min, finish rolling the 1st frame rolling reduction ratio
60%, finish rolling the 2nd frame rolling reduction ratio 40%, finishing temperature is 880 DEG C, 55 DEG C/s of section cooling speed, and coiling temperature is
600℃。
The physical and chemical index of covering slag: hemisphere fusing point is 880 DEG C, basicity is 0.75, and viscosity is 0.75 pool (1300 DEG C),
Bulk density is 0.40kg/L.
Prepare metallographic microstructure figure hot-strip as shown in Figure 4；And the correlation performance parameters of this hot-strip
As shown in table 4.
The performance parameter of the hot-strip that table 4 embodiment 4 produces
Understanding in conjunction with Fig. 4 and Biao 4, the thickness of this hot-strip is 1.8mm, and inclusion behavior is D class, monolateral decarburized layer
The degree of depth has reached 0.76%.
Embodiment 5
It is C:1.05% that refining process carries out the chemical composition ranges of the molten steel after Alloying Treatment, Si:0.15%, Mn:
0.40%, P:0.010%, S:0.008%, N:0.006%, Cr:0.15%, Als:0.020%, remaining is that Fe is with inevitable
Impurity.
This production method passes sequentially through desulfurizing iron → bessemerize → Argon → refine → continuous casting → soaking pit → finish rolling
→ section cooling → batch → slow cooling.
Main technologic parameters value: thickness of strand is 50mm, molten steel overheat is 10 DEG C, and pulling rate is 4.5m/min, casting
Base charging temperature is 1050 DEG C, tapping temperature is 1200 DEG C, and strand time inside furnace is 30min, finish rolling the 1st frame rolling reduction ratio
55%, finish rolling the 2nd frame rolling reduction ratio 45%, finishing temperature is 850 DEG C, 65 DEG C/s of section cooling speed, and coiling temperature is
600℃。
The physical and chemical index of covering slag: hemisphere fusing point is 820 DEG C, basicity is 0.85, and viscosity is 0.80 pool (1300 DEG C),
Bulk density is 0.50kg/L.
Prepare metallographic microstructure figure hot-strip as shown in Figure 2；And the correlation performance parameters of this hot-strip
As shown in table 5.
The performance parameter of the hot-strip that table 5 embodiment 5 produces
Understanding in conjunction with Fig. 5 and Biao 5, the thickness of this hot-strip is 1.5mm, and inclusion behavior is D class, monolateral decarburized layer
The degree of depth has reached 0.78%.
Above example is only optimal citing, and is not the restriction to embodiments of the present invention.Except above-described embodiment
Outward, the present invention also has other embodiments.The technical scheme that all employing equivalents or equivalent transformation are formed, all falls within the present invention
The protection domain required.
Claims (10)
1. a production method for high carbon tool steel hot rolled steel sheet, this production method includes that technological process is: desulfurizing iron, turn
Stove blowing, Argon, refine, sheet blank continuous casting, strand soaking, finish rolling, section cooling and batch, it is characterised in that: critical process
Control includes:
Sheet blank continuous casting: the thickness of sheet billet is 50～90mm, it is 10～40 DEG C that continuous-casting steel pouring controls molten steel overheat, and cast is drawn
Speed is 2.5～5.0m/min；
Employing covering slag pour into a mould, the hemisphere fusing point of this covering slag is 845 ± 70 DEG C, and basicity is 0.85 ± 0.2, viscosity be 1290～
1310 DEG C: 0.80 ± 0.6 pool, bulk density is 0.60 ± 0.4kg/L；
Strand soaking: strand charging temperature is 800～1100 DEG C, tapping temperature is 1100～1250 DEG C, and strand time inside furnace is
30～60min；
Finish rolling: the rolling reduction ratio of the 1st frame and the 2nd frame all controls 40～60%, finishing temperature is 850～950 DEG C；
Section cooling: cooldown rate >=20 DEG C/s；
Batch: coiling temperature is 550～700 DEG C.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1, it is characterised in that: critical process control
System also includes the slow cooling after batching, and the coil of strip after batching uses way of stacking to carry out slow cooling, and slow cooling time in warehouse of steel roll
Control is 48～72h.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1 and 2, it is characterised in that: at thin plate
In base continuous casting process, the thickness of sheet billet is 50～70mm, and it is 15～35 DEG C that continuous-casting steel pouring controls molten steel overheat, pours into a mould pulling rate
It is 3.0～4.5m/min.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 3, it is characterised in that: at sheet billet even
In casting process, the thickness of sheet billet is 50～60mm, and it is 15～20 DEG C that continuous-casting steel pouring controls molten steel overheat, and cast pulling rate is
3.5～4.5m/min.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1 and 2, it is characterised in that: use and protect
Protecting slag cast, the hemisphere fusing point of this covering slag is 845 ± 50 DEG C, and basicity is 0.85 ± 0.1, and viscosity is 1300 DEG C: 0.80 ± 0.5
Pool, bulk density is 0.60 ± 0.2kg/L.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1 and 2, it is characterised in that: at strand
In uniform heating process, strand charging temperature is 850～1050 DEG C, and tapping temperature is 1130～1150 DEG C, and strand time inside furnace is 25
～40min.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1 and 2, it is characterised in that: finish rolling work
In skill, the 1st frame reduction ratio is 50～60%, and the 2nd frame reduction ratio is 50～60%, and finishing temperature is 880～900 DEG C.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1 and 2, it is characterised in that: batch temperature
Degree is 610～650 DEG C.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1, it is characterised in that: described refine
The chemical composition percentage ratio of the molten steel after Cheng Jinhang Alloying Treatment is: C:0.70～1.15%, Si:0.050～0.35%,
Mn:0.20～0.60%, P≤0.015%, S≤0.010%, N≤0.008%, Cr:0.10～0.30%, Als:0.015～
0.040%, remaining is Fe and inevitable impurity.
The production method of high carbon tool steel hot rolled steel sheet the most according to claim 1, it is characterised in that: described refine
Process carries out the chemical composition percentage ratio of the molten steel after Alloying Treatment: C:0.80～1.05%, Si:0.10～0.30%,
Mn:0.20～0.60%, P≤0.015%, S≤0.010%, N≤0.008%, Cr:0.10～0.30%, Als:0.015～
0.040%, remaining is Fe and inevitable impurity.
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