CN108774713A - A kind of high-strength high-toughness cast steel material and its preparation process - Google Patents
A kind of high-strength high-toughness cast steel material and its preparation process Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a kind of high-strength high-toughness cast steel material and its preparation process, raw material and each component content are：C 0.21-0.28%, Si 0.31-0.43%, Mn 0.09-0.13%, B 0.21-0.25%, Ni 0.34-0.42%, Zr 0.09-0.17%, Cr 0.11-0.15%, Al 0.11-0.13%, P 0.07-0.09%, S 0.03-0.04%, Sb 0.07-0.11%, Ti 0.06-0.09%, Ca 0.001-0.004%, rare earth element 0.04-0.07%, O≤0.03%, N≤0.04%, clout are Fe and inevitable impurity.Steel of the present invention have preferable intensity and toughness.
Description
Technical field
The present invention relates to steel casting technology fields, and in particular to a kind of high-strength high-toughness cast steel material and its prepares work
Skill.
Background technology
The cast steel applied on steel market at present can be divided mainly into three classes by tissue：（1）The low-intensity that modifier treatment obtains
Pearlite-ferrite cast steel；（2）The Bainite Casting Steel that air-cooled or isothermal processes obtain；（3）Quenching-low temperature of high intensity returns
The martensitic cast steel of fire.However, contradiction of the above-mentioned three kinds of cast steel in the prevalence of strength and toughness.
By being retrieved to the prior art to passing through, in Chinese invention patent application 201510775828.9（It is open
On January 27th, 2016 day）A kind of high intensity for railway vehicle coupler, high-ductility alloy cast steel material are disclosed, this is described
The chemical composition comprises the following components in percentage by weight of alloy cast steel material is：C：0.14~0.20,Si：0.20~0.40,Mn：0.90~1.20,
Cr：1.00~1.20,Ni：0.60~0.90,Mo：0.20~0.40,S≤0.030,P≤0.030；Surplus is for iron and inevitably
Impurity.Yield strength >=800MPa, tensile strength >=920MPa, elongation >=14%, the section of the alloy cast steel material of the present invention
Shrinking percentage >=40%, -40 DEG C of ballistic work >=35J.But there is the contradictory problems of strength and toughness.
And in Chinese invention patent application 201610334590.0（Publication date on July 27th, 2016）It discloses a kind of high-strength
High tenacity automobile cylinder alloy steel material is spent, each element is by weight percentage：Carbon：0.2-0.5%, silicon：1.2-1.6%, manganese：
2.4-3.1%, molybdenum：1.2-1.8%, gadolinium 0.005-0.05%, zinc：0.05-0.09%, aluminium：0.003-0.05%, zirconium：0.2-0.4%,
Sulphur≤0.015%, phosphorus≤0.015%, surplus are iron and inevitable impurity；Alloy steel material intensity prepared by the present invention compared with
Height, cost is relatively low, while the characteristics of good toughness, good corrosion resistance, is suitable for auto parts and components Material Field.But it still deposits
In the contradiction of strength and toughness.
Based on this, it is necessary to a kind of high-strength high-toughness cast steel material and its preparation process are provided, to solve in the prior art
There are the problem of.
Invention content
The purpose of the present invention is being directed to problem of the prior art, a kind of high-strength high-toughness cast steel material is provided and its prepares work
Skill, cast steel material made from the steel using the technique productions have preferable intensity and toughness, efficiently solve strength and toughness
The problem of can not getting both, and preparation process is simple, production cost is relatively low, can meet the requirement of production.
In order to realize that the above-mentioned purpose of the present invention, spy use following technical scheme：
A kind of high-strength high-toughness cast steel material, raw material and each component content are：C 0.21-0.28%, Si 0.31- 0.43%,
Mn 0.09-0.13%, B 0.21-0.25%, Ni 0.34-0.42%, Zr 0.09-0.17%, Cr 0.11- 0.15%, Al
0.11-0.13%, P 0.07-0.09%, S 0.03-0.04%, Sb 0.07-0.11%, Ti 0.06- 0.09%, Ca
0.001-0.004%, rare earth element 0.04-0.07%, O≤0.03%, N≤0.04%, clout are Fe and inevitable impurity.
Preferably, raw material and each component content are：C 0.23-0.25%, Si 0.34-0.39%, Mn 0.11-
0.13%, B 0.22-0.24%, Ni 0.37-0.41%, Zr 0.1-0.15%, Cr 0.13-0.15%, Al 0.11-
0.13%, P 0.08-0.09%, S 0.03-0.04%, Sb 0.08-0.1%, Ti 0.07-0.09%, Ca 0.002-
0.004%, rare earth element 0.04- 0.06%, O≤0.03%, N≤0.04%, clout are Fe and inevitable impurity.
Preferably, raw material and each component content are：C 0.24%, Si 0.34%, Mn 0.12%, B 0.23%, Ni
0.39%, Zr 0.11%, Cr 0.14%, Al 0.12%, P 0.09%, S 0.04%, Sb 0.09%, Ti 0.07%, Ca
0.003%, rare earth element 0.05%, O≤0.03%, N≤0.04%, clout are Fe and inevitable impurity.
Preferably, the rare earth element is by weight percentage and including following component： Y：10-20%, Pm：5-7%,
Ga：10-20%, Bi：6-10%, surplus Ce.
The present invention also provides the preparation processes of above-mentioned high-strength high-toughness cast steel material, comprise the following steps that：
（1）Melting：Scrap iron is put into electric furnace, progress is smelt molten iron in advance, and calcium carbide powder is added into molten iron；
（2）Charging：It adds the alloyed iron containing each element in raw material again into molten iron, and nitrogen flushing processing is carried out to molten iron；
（3）Refining：To step（2）Refining agent is added in molten iron and refines 40-50min, is sampled after keeping the temperature 25min, after analysis ingredient,
Adjusting component melts 5-10min, then carries out vacuum outgas, and molten steel whole blowing argon gas in vacuum process vacuumizes pressure
Refining molten iron is made in power≤1Kpa, pumpdown time >=15min；
（4）Continuous casting：Molten iron is obtained after nitrogen flushing is handled, and rectangular continuous casting billet is poured on conticaster；
（5）Heating：Continuous casting billet is put into vacuum furnace and is heated, 1100-1200 DEG C of heating temperature, continuous casting billet is come out of the stove soaking temperature
≤ 50 DEG C of degree, continuous casting billet time inside furnace >=400min；
（6）It rolls：By step（5）Continuous casting billet after middle heat treatment first uses 3-6 passage roughings, and it is 30- to roll into thickness
Base among 50mm, then carry out finish rolling, 830 DEG C -850 DEG C of finish rolling start rolling temperature, 780 DEG C -800 of finish rolling finishing temperature through 4-7 racks
DEG C, it rolls rear air-cooled；
（7）Heat treatment：By step（6）Slab after rolling keeps the temperature 30-40min at 900-950 DEG C, then cools to 180- rapidly
210℃；Then temperature is risen at 720-730 DEG C and is kept the temperature 5-6h again, be finally down to temperature slowly with 2 DEG C/min rates
600-630 DEG C, then keep the temperature 7-8h.
（8）Finishing：By step（7）Steel slab surface after heat treatment carries out mechanization and finely polishes, and obtains high intensity height
Toughness cast steel material.
Preferably, the step（3）In refining agent be made from the following raw materials in parts by weight：NaBF45-8 parts, chlorination
3-5 parts of sodium, Na2TiF68-10 parts, 5-8 parts of NaF.
Preferably, the step（4）Middle continuous casting operation is controlled at 850-900 DEG C.
Preferably, the step（5）1150-1200 DEG C of middle continuous blank heating temperature.
Preferably, the step（6）In roll after slab cooling velocity be 22-26 DEG C/s.
Preferably, step（8）Afterwards, further include cast steel material flaw detection processing, the measurement analysis of mechanical performance, be finally prepared into
To qualified products.
Compared with prior art, the present invention has following advantageous effect：
（1）The present invention has preferable intensity and toughness by the way that proportioning and production technology, cast steel material obtained is rationally arranged, and
Higher low-temperature flexibility.
（2）The present invention is smelted by high temperature furnace and vacuum processing technique, ensure that the degree of purity of molten steel, and pass through low overheat
The casting process of degree is poured into a mould under argon atmosphere protection, can produce the strand of high quality, high-strength to be carried out to strand
Heat treatment process carry out established better basis.
（3）The present invention in steel by being added specific a variety of rare earth elements, because it is arranged with unique electron outside nucleus
Cloth can improve institutional framework in metallurgical process, improve the intensity and toughness of steel.
（4）The present invention can make surface of semi-finished generate the tempering of 3-5mm thickness by Tempering and Quenching coordination of processes cooling process
Martensitic structure effectively improves the toughness of steel, can also tissue be made to be more uniformly distributed stabilization, is not likely to produce aging oxidative phenomena, carries
The high service life of steel.
（5）The present invention can effectively improve cast steel material intensity by alloying elements such as Cr, Ni, Zr for adding in the feed,
And the quenching degree of cast steel material can also be improved, have the function that post-curing so that the intensity of cast steel material is further promoted, simultaneously
It is aided with the micro alloying elements crystal grain thinning such as Ti, Mn, Sb, changes recrystallization state so that cast steel material obdurability matches.
（6）The present invention solves intensity and impact flexibility can not by being improved to techniques such as casting, rolling and heat treatments
Get both problem, meanwhile, cast steel material obtained has preferable low temperature impact properties.
Specific implementation mode
Invention is described in further detail below in conjunction with specific embodiment.
Embodiment 1
The high-strength high-toughness cast steel material of the present embodiment, raw material and each component content are：C 0.21%, Si 0.31%, Mn
0.09%, B 0.21%, Ni 0.34%, Zr 0.09%, Cr 0.11%, Al 0.11%, P 0.07%, S 0.03%, Sb
0.07%, Ti 0.06%, Ca 0.001%, rare earth element 0.04%, O≤0.03%, N≤0.04%, clout are Fe and can not keep away
The impurity exempted from.
Wherein, the rare earth element is by weight percentage and including following component： Y：10%, Pm：5%, Ga：10%,
Bi：6%, surplus Ce.
The present invention also provides the preparation processes of above-mentioned high-strength high-toughness cast steel material, comprise the following steps that：
（1）Melting：Scrap iron is put into electric furnace, progress is smelt molten iron in advance, and calcium carbide powder is added into molten iron；
（2）Charging：It adds the alloyed iron containing each element in raw material again into molten iron, and nitrogen flushing processing is carried out to molten iron；
（3）Refining：To step（2）Refining agent is added in molten iron and refines 40-50min, is sampled after keeping the temperature 25min, after analysis ingredient,
Adjusting component melts 5-10min, then carries out vacuum outgas, and molten steel whole blowing argon gas in vacuum process vacuumizes pressure
Refining molten iron is made in power≤1Kpa, pumpdown time >=15min；
（4）Continuous casting：Molten iron is obtained after nitrogen flushing is handled, and rectangular continuous casting billet is poured on conticaster；
（5）Heating：Continuous casting billet is put into vacuum furnace and is heated, 1100-1200 DEG C of heating temperature, continuous casting billet is come out of the stove soaking temperature
≤ 50 DEG C of degree, continuous casting billet time inside furnace >=400min；
（6）It rolls：By step（5）Continuous casting billet after middle heat treatment first uses 3-6 passage roughings, and it is 30- to roll into thickness
Base among 50mm, then carry out finish rolling, 830 DEG C -850 DEG C of finish rolling start rolling temperature, 780 DEG C -800 of finish rolling finishing temperature through 4-7 racks
DEG C, it rolls rear air-cooled；
（7）Heat treatment：By step（6）Slab after rolling keeps the temperature 30-40min at 900-950 DEG C, then cools to 180- rapidly
210℃；Then temperature is risen at 720-730 DEG C and is kept the temperature 5-6h again, be finally down to temperature slowly with 2 DEG C/min rates
600-630 DEG C, then keep the temperature 7-8h.
（8）Finishing：By step（7）Steel slab surface after heat treatment carries out mechanization and finely polishes, and obtains high intensity height
Toughness cast steel material.
Wherein, the step（3）In refining agent be made from the following raw materials in parts by weight：NaBF45 parts, 3 parts of sodium chloride,
Na2TiF68 parts, 5 parts of NaF.
Wherein, the step（4）Middle continuous casting operation is controlled at 850-900 DEG C.
Wherein, the step（5）1150-1200 DEG C of middle continuous blank heating temperature.
Wherein, the step（6）In roll after slab cooling velocity be 22-26 DEG C/s.
Wherein, step（8）Afterwards, further include cast steel material flaw detection processing, the measurement analysis of mechanical performance, conjunction is finally prepared
Lattice product.
Embodiment 2
The high-strength high-toughness cast steel material of the present embodiment, raw material and each component content are：C 0.28%, Si 0.43%, Mn
0.13%, B 0.25%, Ni 0.42%, Zr 0.17%, Cr 0.15%, Al 0.13%, P 0.09%, S 0.04%, Sb
0.11%, Ti 0.09%, Ca 0.004%, rare earth element 0.07%, O≤0.03%, N≤0.04%, clout are Fe and can not keep away
The impurity exempted from.
Wherein, the rare earth element is by weight percentage and including following component：Y：20%, Pm：7%, Ga：20%, Bi：
10%, surplus Ce.
The present invention also provides the preparation processes of above-mentioned high-strength high-toughness cast steel material, comprise the following steps that：
（1）Melting：Scrap iron is put into electric furnace, progress is smelt molten iron in advance, and calcium carbide powder is added into molten iron；
（2）Charging：It adds the alloyed iron containing each element in raw material again into molten iron, and nitrogen flushing processing is carried out to molten iron；
（3）Refining：To step（2）Refining agent is added in molten iron and refines 40-50min, is sampled after keeping the temperature 25min, after analysis ingredient,
Adjusting component melts 5-10min, then carries out vacuum outgas, and molten steel whole blowing argon gas in vacuum process vacuumizes pressure
Refining molten iron is made in power≤1Kpa, pumpdown time >=15min；
（4）Continuous casting：Molten iron is obtained after nitrogen flushing is handled, and rectangular continuous casting billet is poured on conticaster；
（5）Heating：Continuous casting billet is put into vacuum furnace and is heated, 1100-1200 DEG C of heating temperature, continuous casting billet is come out of the stove soaking temperature
≤ 50 DEG C of degree, continuous casting billet time inside furnace >=400min；
（6）It rolls：By step（5）Continuous casting billet after middle heat treatment first uses 3-6 passage roughings, and it is 30- to roll into thickness
Base among 50mm, then carry out finish rolling, 830 DEG C -850 DEG C of finish rolling start rolling temperature, 780 DEG C -800 of finish rolling finishing temperature through 4-7 racks
DEG C, it rolls rear air-cooled；
（7）Heat treatment：By step（6）Slab after rolling keeps the temperature 30-40min at 900-950 DEG C, then cools to 180- rapidly
210℃；Then temperature is risen at 720-730 DEG C and is kept the temperature 5-6h again, be finally down to temperature slowly with 2 DEG C/min rates
600-630 DEG C, then keep the temperature 7-8h.
（8）Finishing：By step（7）Steel slab surface after heat treatment carries out mechanization and finely polishes, and obtains high intensity height
Toughness cast steel material.
Wherein, the step（3）In refining agent be made from the following raw materials in parts by weight：NaBF48 parts, 5 parts of sodium chloride,
Na2TiF610 parts, 8 parts of NaF.
Wherein, the step（4）Middle continuous casting operation is controlled at 850-900 DEG C.
Wherein, the step（5）1150-1200 DEG C of middle continuous blank heating temperature.
Wherein, the step（6）In roll after slab cooling velocity be 22-26 DEG C/s.
Wherein, step（8）Afterwards, further include cast steel material flaw detection processing, the measurement analysis of mechanical performance, conjunction is finally prepared
Lattice product.
Embodiment 3
The high-strength high-toughness cast steel material of the present embodiment, raw material and each component content are：C 0.24%, Si 0.34%, Mn
0.12%, B 0.23%, Ni 0.39%, Zr 0.11%, Cr 0.14%, Al 0.12%, P 0.09%, S 0.04%, Sb
0.09%, Ti 0.07%, Ca 0.003%, rare earth element 0.05%, O≤0.03%, N≤0.04%, clout are Fe and can not keep away
The impurity exempted from.
Wherein, the rare earth element is by weight percentage and including following component：Y：15%, Pm：6%, Ga：15%, Bi：
8%, surplus Ce.
The present invention also provides the preparation processes of above-mentioned high-strength high-toughness cast steel material, comprise the following steps that：
（1）Melting：Scrap iron is put into electric furnace, progress is smelt molten iron in advance, and calcium carbide powder is added into molten iron；
（2）Charging：It adds the alloyed iron containing each element in raw material again into molten iron, and nitrogen flushing processing is carried out to molten iron；
（3）Refining：To step（2）Refining agent is added in molten iron and refines 40-50min, is sampled after keeping the temperature 25min, after analysis ingredient,
Adjusting component melts 5-10min, then carries out vacuum outgas, and molten steel whole blowing argon gas in vacuum process vacuumizes pressure
Refining molten iron is made in power≤1Kpa, pumpdown time >=15min；
（4）Continuous casting：Molten iron is obtained after nitrogen flushing is handled, and rectangular continuous casting billet is poured on conticaster；
（5）Heating：Continuous casting billet is put into vacuum furnace and is heated, 1100-1200 DEG C of heating temperature, continuous casting billet is come out of the stove soaking temperature
≤ 50 DEG C of degree, continuous casting billet time inside furnace >=400min；
（6）It rolls：By step（5）Continuous casting billet after middle heat treatment first uses 3-6 passage roughings, and it is 30- to roll into thickness
Base among 50mm, then carry out finish rolling, 830 DEG C -850 DEG C of finish rolling start rolling temperature, 780 DEG C -800 of finish rolling finishing temperature through 4-7 racks
DEG C, it rolls rear air-cooled；
（7）Heat treatment：By step（6）Slab after rolling keeps the temperature 30-40min at 900-950 DEG C, then cools to 180- rapidly
210℃；Then temperature is risen at 720-730 DEG C and is kept the temperature 5-6h again, be finally down to temperature slowly with 2 DEG C/min rates
600-630 DEG C, then keep the temperature 7-8h.
（8）Finishing：By step（7）Steel slab surface after heat treatment carries out mechanization and finely polishes, and obtains high intensity height
Toughness cast steel material.
Wherein, the step（3）In refining agent be made from the following raw materials in parts by weight：NaBF46.5 parts, sodium chloride 4
Part, Na2TiF69 parts, 6.5 parts of NaF.
Wherein, the step（4）Middle continuous casting operation is controlled at 850-900 DEG C.
Wherein, the step（5）1150-1200 DEG C of middle continuous blank heating temperature.
Wherein, the step（6）In roll after slab cooling velocity be 22-26 DEG C/s.
Wherein, step（8）Afterwards, further include cast steel material flaw detection processing, the measurement analysis of mechanical performance, conjunction is finally prepared
Lattice product.
Comparative example 1
Using steel made from Chinese invention patent application 201510775828.9.
Comparative example 2
Using steel made from Chinese invention patent application 201610334590.0.
Experimental example
Tensile strength, yield strength, hardness, extension are carried out to steel made from above-described embodiment 1-3 and comparative example 1, comparative example 2
Rate performance test, is specifically shown in Table 1.
Table 1
| Test event | Tensile strength（MPa） | Yield strength（MPa） | Hardness（HRB） | Elongation percentage（1.6mm thickness） |
| Embodiment 1 | 1387 | 1395 | 95 | 15 |
| Embodiment 2 | 1396 | 1403 | 93 | 14 |
| Embodiment 3 | 1402 | 1414 | 97 | 16 |
| Comparative example 1 | 856 | 775 | 67 | 9 |
| Comparative example 2 | 967 | 820 | 79 | 11 |
As shown in Table 1, steel of the invention and typical aluminium alloy are equal in tensile strength, yield strength, hardness, elongation percentage etc.
Better than comparative example.
In conclusion the creativeness of the present invention is mainly reflected in the following：
（1）The present invention has preferable intensity and toughness by the way that proportioning and production technology, cast steel material obtained is rationally arranged, and
Higher low-temperature flexibility.
（2）The present invention is smelted by high temperature furnace and vacuum processing technique, ensure that the degree of purity of molten steel, and pass through low overheat
The casting process of degree is poured into a mould under argon atmosphere protection, can produce the strand of high quality, high-strength to be carried out to strand
Heat treatment process carry out established better basis.
（3）The present invention in steel by being added specific a variety of rare earth elements, because it is arranged with unique electron outside nucleus
Cloth can improve institutional framework in metallurgical process, improve the intensity and toughness of steel.
（4）The present invention can make surface of semi-finished generate the tempering of 3-5mm thickness by Tempering and Quenching coordination of processes cooling process
Martensitic structure effectively improves the toughness of steel, can also tissue be made to be more uniformly distributed stabilization, is not likely to produce aging oxidative phenomena, carries
The high service life of steel.
（5）The present invention can effectively improve cast steel material intensity by alloying elements such as Cr, Ni, Zr for adding in the feed,
And the quenching degree of cast steel material can also be improved, have the function that post-curing so that the intensity of cast steel material is further promoted, simultaneously
It is aided with the micro alloying elements crystal grain thinning such as Ti, Mn, Sb, changes recrystallization state so that cast steel material obdurability matches.
（6）The present invention solves intensity and impact flexibility can not by being improved to techniques such as casting, rolling and heat treatments
Get both problem, meanwhile, cast steel material obtained has preferable low temperature impact properties.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of high-strength high-toughness cast steel material, which is characterized in that raw material and each component content are：C 0.21-0.28%, Si
0.31- 0.43%, Mn 0.09-0.13%, B 0.21-0.25%, Ni 0.34-0.42%, Zr 0.09-0.17%, Cr
0.11- 0.15%, Al 0.11-0.13%, P 0.07-0.09%, S 0.03-0.04%, Sb 0.07-0.11%, Ti
0.06- 0.09%, Ca 0.001-0.004%, rare earth element 0.04-0.07%, O≤0.03%, N≤0.04%, clout be Fe and
Inevitable impurity.
2. high-strength high-toughness cast steel material according to claim 1, which is characterized in that raw material and each component content are：C
0.23-0.25%, Si 0.34-0.39%, Mn 0.11- 0.13%, B 0.22-0.24%, Ni 0.37-0.41%, Zr
0.1-0.15%, Cr 0.13-0.15%, Al 0.11- 0.13%, P 0.08-0.09%, S 0.03-0.04%, Sb
0.08-0.1%, Ti 0.07-0.09%, Ca 0.002-0.004%, rare earth element 0.04- 0.06%, O≤0.03%, N≤
0.04%, clout is Fe and inevitable impurity.
3. high-strength high-toughness cast steel material according to claim 1, which is characterized in that raw material and each component content are：C
0.24%, Si 0.34%, Mn 0.12%, B 0.23%, Ni 0.39%, Zr 0.11%, Cr 0.14%, Al 0.12%, P
0.09%, S 0.04%, Sb 0.09%, Ti 0.07%, Ca 0.003%, rare earth element 0.05%, O≤0.03%, N≤
0.04%, clout is Fe and inevitable impurity.
4. high-strength high-toughness cast steel material according to claim 1, which is characterized in that rare earth element percentage by weight
It include when following component： Y：10-20%, Pm：5-7%, Ga：10-20%, Bi：6-10%, surplus Ce.
5. according to the preparation process of claim 1-4 any one of them high-strength high-toughness cast steel materials, which is characterized in that including
Following processing step：
（1）Melting：Scrap iron is put into electric furnace, progress is smelt molten iron in advance, and calcium carbide powder is added into molten iron；
（2）Charging：It adds the alloyed iron containing each element in raw material again into molten iron, and nitrogen flushing processing is carried out to molten iron；
（3）Refining：To step（2）Refining agent is added in molten iron and refines 40-50min, is sampled after keeping the temperature 25min, after analysis ingredient,
Adjusting component melts 5-10min, then carries out vacuum outgas, and molten steel whole blowing argon gas in vacuum process vacuumizes pressure
Refining molten iron is made in power≤1Kpa, pumpdown time >=15min；
（4）Continuous casting：Molten iron is obtained after nitrogen flushing is handled, and rectangular continuous casting billet is poured on conticaster；
（5）Heating：Continuous casting billet is put into vacuum furnace and is heated, 1100-1200 DEG C of heating temperature, continuous casting billet is come out of the stove soaking temperature
≤ 50 DEG C of degree, continuous casting billet time inside furnace >=400min；
（6）It rolls：By step（5）Continuous casting billet after middle heat treatment first uses 3-6 passage roughings, and it is 30- to roll into thickness
Base among 50mm, then finish rolling, 830-850 DEG C of finish rolling start rolling temperature are carried out through 4-7 racks, 780-800 DEG C of finish rolling finishing temperature is rolled
It is air-cooled afterwards；
（7）Heat treatment：By step（6）Slab after rolling keeps the temperature 30-40min at 900-950 DEG C, then cools to 180- rapidly
210℃；Then temperature is risen at 720-730 DEG C and is kept the temperature 5-6h again, be finally down to temperature slowly with 2 DEG C/min rates
600-630 DEG C, then keep the temperature 7-8h；
（8）Finishing：By step（7）Steel slab surface after heat treatment carries out mechanization and finely polishes, and obtains high-intensity and high-tenacity
Cast steel material.
6. the preparation process of high-strength high-toughness cast steel material according to claim 5, which is characterized in that the step（3）
In refining agent be made from the following raw materials in parts by weight：NaBF45-8 parts, 3-5 parts of sodium chloride, Na2TiF68-10 parts, NaF 5-8
Part.
7. the preparation process of high-strength high-toughness cast steel material according to claim 5, which is characterized in that the step（4）
Middle continuous casting operation is controlled at 850-900 DEG C.
8. the preparation process of high-strength high-toughness cast steel material according to claim 5, which is characterized in that the step（5）
1150-1200 DEG C of middle continuous blank heating temperature.
9. the preparation process of high-strength high-toughness cast steel material according to claim 5, which is characterized in that the step（6）
In roll after slab cooling velocity be 22-26 DEG C/s.
10. the preparation process of high-strength high-toughness cast steel material according to claim 5, which is characterized in that step（8）Afterwards,
Further include cast steel material flaw detection processing, the measurement analysis of mechanical performance, qualified products are finally prepared.
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| CN103667890A (en) * | 2013-11-08 | 2014-03-26 | 张超 | Alloy steel material for pump shaft and preparation method thereof |
| CN104911476A (en) * | 2015-07-10 | 2015-09-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel and preparation method and use thereof |
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| CN103667890A (en) * | 2013-11-08 | 2014-03-26 | 张超 | Alloy steel material for pump shaft and preparation method thereof |
| CN106256918A (en) * | 2015-06-17 | 2016-12-28 | 上海梅山钢铁股份有限公司 | The Automobile flywheel cold-strip steel of a kind of precision stamping processing and manufacture method thereof |
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