CN104493118B - A kind of middle low-carbon high strength steel homogenizes the production method of strand - Google Patents
A kind of middle low-carbon high strength steel homogenizes the production method of strand Download PDFInfo
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- CN104493118B CN104493118B CN201410740946.1A CN201410740946A CN104493118B CN 104493118 B CN104493118 B CN 104493118B CN 201410740946 A CN201410740946 A CN 201410740946A CN 104493118 B CN104493118 B CN 104493118B
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- 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
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
Abstract
The present invention relates to a kind of middle low-carbon high strength steel to homogenize the production method of strand.Its technical scheme: feed cold steel band in Low-carbon High Strength molten steel in conticaster crystallizer or ingot mould, the feed quantity of cold steel band is 0.3 ~ 1.0wt% of described middle Low-carbon High Strength molten steel.Feed the speed V of cold steel band
band=A × V
casting× (T
tundish– T
liqudus)/T
liqudus, the vibration frequency of strip feeding machine is 50 ~ 35000Hz.Described cold steel band: C content is 0.2 ~ 0.65wt% or silicone content is 1 ~ 3wt%, fusing point is lower 3 ~ 30 DEG C than institute's strand fusing point, and surperficial painting antirust oil, thickness is 1 ~ 6mm.Present invention process is simple, with low cost and easy to operate; Homogenize macrostructure's structure of strand of the middle low-carbon high strength steel produced obtains obvious improvement, remarkable reduction or eliminate axis/center segregation and the underbead crack of chemical element, improve the plasticity and toughness of rolled plate, the HIC that improve Kind of Steels Used in Engineering Structures and corrosion-resisting steel detects qualification rate.
Description
Technical field
The invention belongs to casting technology field.Particularly relate to a kind of middle low-carbon high strength steel to homogenize the production method of strand.
Background technology
Crystallizer and ingot mould are very crucial " heart " parts in casting, and the process of setting of molten steel in crystallizer and ingot mould has conclusive impact to cc billet surface quality and internal soundness.The quality of axis/center segregation on finished steel of continuous casting billet and bloom has remarkable impact.The ever-increasing demand of high-quality steel makes technical staff face how to reduce the axis/center segregation of continuous casting billet and bloom, produces the difficult problem meeting high request high-quality continuous casting steel billet and bloom.Continuous casting steel billet is formed under the height expansion liquid-phase condition up to tens meters, and this condition can have a strong impact on the development of structure and chemical non uniformity.If the slab of compression ratio <3 ~ 4 exists axial heterogeneity, dominance impact can be produced on performance figure: the mechanical performance first reducing milling material Z-direction, causes the formation of axial crack and ultrasonic defect in some cases; For corrosion-resisting steel, except required mechanical performance, HIC detection index also has mastery impact to the serviceability of metallic article.Hydrogen induced cracking is mainly caused by the axial segregation of chemical element, and hydrogen induced cracking drag is that length rate (CLR), width rate (CTR) and the Sensitivity rate (CSR) according to the index-crackle characterizing hydrogen induced cracking carries out evaluating.The length rate (CLR) of crackle, width rate (CTR) and Sensitivity rate (CSR) follow following relation: the degree of segregation is lower, and the level of resistance against hydrogen cracking is higher; Continuous casting steel billet axially and the development of center segregation and underbead crack to determine primarily of macrostructure's structure of continuous casting steel billet, particularly determined by the development degree in ingotism region and the spread thereof.
Guaranteeing to be formed the essential condition with the disperse crystal structure steel improving performance is reduce the degree of superheat of molten steel in casting process, and the degree of superheat is the difference of melt temperature and liquidus temperature.When there is not melt overheat, develop into the skeleton of different directions, and form globular crystal tagma.Be processed in the process of finished product by spray subsequently, the cast structure of established dispersivity keeps down to a great extent.
Relative to conventional die castings technique, continuous casting process is a great technological progress, but the quality of the restriction continuous cast products such as inherent product defects is as low in equiaxial crystal ratio, center segregation, center porosity and centre burst.As " a kind of control method of sheet billet continuous casting position of soft reduction " (CN200510028601.4) and " horizontal continuous-casting electromagnetic agitating technology " (CN200510032537.7) though adopt the technology such as optimal water allocation, slighter compress and electromagnetic agitation partly can improve slab quality, but these measures investment is large, the stable operation requirement for steelmaking and continuous casting is high, Controlling model is complicated and influence factor is many.Simultaneously because above-mentioned two kinds of technology are large by the impact of steel grade chemical composition and mass percent (wt%) and technological parameter (liquid steel temperature, pulling rate, cooling water and conticaster state etc.), thus restive for the uniformity of continuous casting billet structure.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide simple, the with low cost and easy to operate middle low-carbon high strength steel of a kind of technique and homogenizes the production method of strand; In producing by the method low-carbon high strength steel homogenize strand macrostructure structure can be improved significantly, can significantly weaken or eliminate axis/center segregation and the underbead crack of chemical element, can improve the plasticity and toughness of rolled plate, the HIC that can improve Kind of Steels Used in Engineering Structures and corrosion-resisting steel detects qualification rate.
For achieving the above object, the technical solution used in the present invention: feed cold steel band in Low-carbon High Strength molten steel in continuous cast mold or ingot mould, the feed quantity of cold steel band is 0.3 ~ 1.0wt% of described middle Low-carbon High Strength molten steel.
The vibration frequency feeding the strip feeding machine of cold steel band is 50 ~ 35000Hz; Feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, A is 3 ~ 30;
V
castingfor the casting rate of conticaster or die casting, m/min;
T
tundishfor tundish temperature, DEG C;
T
liqudusby the liquidus temperature of casting steel grade, DEG C;
(T
tundish– T
liqudus) be the degree of superheat, DEG C.
The C content of described cold steel band is 0.2 ~ 0.65wt% or silicone content is 1 ~ 3wt%, and the fusing point of described cold steel band is lower 3 ~ 30 DEG C than institute's strand fusing point, described cold steel strip surface oxide-free iron sheet, and surperficial painting antirust oil, described cold thickness of strips is 1 ~ 6mm.
Owing to adopting technique scheme, the present invention compared with prior art has following good effect:
The present invention adopts the foundry engieering of consumable macroscopic view low-temperature receiver, solve the problem reducing melt overheat, correspondingly obtain uniform macrostructure structure, namely by only reducing the mode of liquid molten steel overheat in continuous-casting of steel billet machine crystallizer or ingot mould, obtain the compact crystal structure waiting axle, significantly improve strand both macro and micro institutional framework.
The present invention is by cold steel band feeding crystallizer molten steel, thawing heat absorption by cold steel band reduces the degree of superheat of molten steel in crystallizer or ingot mould, improve the crystallization process of molten steel, make the crystallization process from casting billet surface to center become the crystallization process almost simultaneously carried out at section, therefore present invention process is simple, with low cost and easy to operate.
Outstanding feature of the present invention is: under the condition of meniscus crystallization is not disturbed in guarantee, feed appropriate cold steel band, the feeding speed V of cold steel band
band=A × V
casting× (T
tundish– T
liqudus)/T
liqudus, A is wherein degree of superheat adjustment factor, degree of superheat adjustment factor A and conticaster crystallizer size and steel grade chemical composition of casting relevant.Feed the speed V of cold steel band
banddetermination meet two conditions: one is the crystallization nuclei defining required quantity after the cold steel band of feeding, and two is the abundant meltings of cold steel band made in liquid core.Under the vibration of strip feeding machine, the cold steel band of feeding vibrates with the frequency of 50 ~ 35000Hz, improves fusing and the casting blank solidification process of cold steel band, promotes homogeneous nucleation.
The present invention significantly can increase nucleus owing to adding macroscopical low-temperature receiver in the melt, namely the quantity of crystallization nuclei is increased, therefore the melting of the cold steel band of feeding makes the molten steel overheat entering crystallizer or ingot mould reduce, nucleus quantity increases, formation condition in axle skeleton and globular crystal tagma significantly improves, and also can reduce the center segregation of continuous casting billet and ingot mould simultaneously.The continuous casting billet non-stop layer segregation cast, that is C level 0 ~ 0.5.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is more than 99%.
Therefore, the present invention has simple, the with low cost and easy to operate feature of technique; Homogenize macrostructure's structure of strand of the middle low-carbon high strength steel produced obtains obvious improvement, remarkable reduction or eliminate axis/center segregation and the underbead crack of chemical element, improve the plasticity and toughness of rolled plate, the HIC that improve Kind of Steels Used in Engineering Structures and corrosion-resisting steel detects qualification rate.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the invention will be further described, the restriction not to its protection domain.
Embodiment 1
A kind of middle low-carbon high strength steel homogenizes the production method of strand.Production method described in the present embodiment is the S355 steel continuous casting billet of 250mm × 1850mm at straight curved crystallizer double flow tray billet continuous casting machine top casting cross section.Known: tundish temperature T
tundishit is 1530.3 ~ 1539.8 DEG C; The casting rate V of conticaster
castingbe 0.9 ~ 1.1m/min; The chemical composition of S355 steel of casting and mass percent (wt%) as shown in table 1:
Table 1
| C | Si | Mn | Ni | Cu | V | Mo | Cr | S | P |
| 0.16～0.19 | 0.25～0.3 | 1.2～1.4 | 0.03 | 0 | 0 | 0 | 0.03 | 0～0.003 | 0～0.01 |
According to the chemical composition of steel grade shown in table 1 and mass percent (wt%) thereof, the liquidus temperature T of the S355 steel of casting
liqudus=1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1510.3 ~ 1514.8 DEG C.
Feed cold steel band in Low-carbon High Strength molten steel in straight curved continuous cast mold, the feed quantity of cold steel band is 0.5 ~ 0.6wt% of described middle Low-carbon High Strength molten steel.
The vibration frequency feeding the strip feeding machine of cold steel band is 500 ~ 4000Hz, feeds the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, in the present embodiment, A is 16 ~ 20;
V
castingfor the casting rate of conticaster, V in the present embodiment
castingbe 0.9 ~ 1.1m/min;
T
tundishfor tundish temperature, T in the present embodiment
tundishit is 1530.3 ~ 1539.8 DEG C;
T
liqudusby the liquidus temperature of casting steel grade, T in the present embodiment
liqudusit is 1510.3 ~ 1514.8 DEG C;
(T
tundish– T
liqudus) be the degree of superheat, (T in the present embodiment
tundish– T
liqudus) be 20 ~ 25 DEG C.
Described in the present embodiment, the C content of cold steel band is 0.2 ~ 0.45wt%, and the fusing point of cold steel band is lower 3 ~ 10 DEG C than institute's strand fusing point, described cold steel strip surface oxide-free iron sheet, and surperficial painting antirust oil, described cold thickness of strips is 2 ~ 4mm.
By A=16 ~ 20, V
casting=0.9 ~ 1.1m/min, (T
tundish– T
liqudus)=20 ~ 25 DEG C and T
liqudus=1510.3 ~ 1514.8 DEG C substitute in formula (1), feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus＝0.19～0.36m/min。
The present embodiment the center segregation of continuous casting billet of casting be C level 0.5.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is greater than 99.3%.
Embodiment 2
A kind of middle low-carbon high strength steel homogenizes the production method of strand.Production method described in the present embodiment is pipe line steel Х 65 continuous casting billet of 300mm × 2000mm at straight curved crystallizer double flow tray billet continuous casting machine top casting cross section.Known: tundish temperature T
tundishit is 1538 ~ 1547 DEG C; The casting rate V of conticaster
castingbe 0.7 ~ 0.8m/min; The chemical composition of Х 65 continuous casting billet of casting and mass percent (wt%) as shown in table 2:
Table 2
| C | Si | Mn | Ni | Cu | V | Mo | Cr | S | P |
| 0.08～0.1 | 0.25～0.35 | 1.2～1.4 | 0 | 0 | 0.03～0.04 | 0 | 0 | 0～0.002 | 0～0.01 |
According to its mass percent of the chemical composition of steel grade shown in table 2 (wt%), the liquidus temperature T of the X65 continuous casting billet of casting
liqudus=1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1518 ~ 1522 DEG C.
Feed cold steel band in Low-carbon High Strength molten steel in straight curved continuous cast mold, the feed quantity of cold steel band is 0.3 ~ 0.4wt% of described middle Low-carbon High Strength molten steel.
The vibration frequency feeding the strip feeding machine of cold steel band is 20000 ~ 35000Hz, feeds the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, in the present embodiment, A is 13 ~ 16;
V
castingfor the casting rate of conticaster, V in the present embodiment
castingbe 0.7 ~ 0.8m/min;
T
tundishfor tundish temperature, T in the present embodiment
tundishit is 1538 ~ 1547 DEG C;
T
liqudusby the liquidus temperature of casting steel grade, T in the present embodiment
liqudusit is 1518 ~ 1522 DEG C;
(T
tundish– T
liqudus) be the degree of superheat, (T in the present embodiment
tundish– T
liqudus) be 20 ~ 25 DEG C.
Described in the present embodiment, the C content of cold steel band is 0.3 ~ 0.4wt%, and the fusing point of cold steel band is lower 20 ~ 30 DEG C than institute's strand fusing point, described cold steel strip surface oxide-free iron sheet, and surperficial painting antirust oil, described cold thickness of strips is 1 ~ 3mm.
By A=13 ~ 16, V
casting=0.7 ~ 0.8m/min, (T
tundish– T
liqudus)=20 ~ 25 DEG C and T
liqudus=1518 ~ 1522 DEG C substitute in formula (1), feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus＝0.12～0.21m/min。
The present embodiment the center segregation of continuous casting billet of casting be C level 0.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is greater than 99.7%.
Embodiment 3
A kind of middle low-carbon high strength steel homogenizes the production method of strand.Production method described in the present embodiment is the Q235B steel continuous casting billet of the single current rectangle blank continuous caster top casting cross section 300mm × 400mm at full curved mould.Known: tundish temperature T
tundishit is 1531.9 ~ 1543.8 DEG C; The casting rate V of conticaster
castingbe 1.2 ~ 1.4m/min; The chemical composition of Q235B steel of casting and mass percent (wt%) as shown in table 3:
Table 3
| C | Si | Mn | Ni | Cu | V | Mo | Cr | S | P |
| 0.15～0.2 | 0.25～0.35 | 0.6～0.8 | 0 | 0 | 0 | 0 | 0 | 0～0.01 | 0～0.015 |
According to the chemical composition of steel grade shown in table 3 and mass percent (wt%) thereof, the liquidus temperature T of the Q235B steel of casting
liqudus=1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1511.9 ~ 1518.8 DEG C.
Feed cold steel band in Low-carbon High Strength molten steel in full curved mould, the feed quantity of cold steel band is 0.4 ~ 0.5wt% of described middle Low-carbon High Strength molten steel.
The vibration frequency feeding the strip feeding machine of cold steel band is 50 ~ 500Hz, feeds the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, in the present embodiment, A is 8 ~ 13;
V
castingfor the casting rate of conticaster, V in the present embodiment
castingbe 1.2 ~ 1.4m/min;
T
tundishfor tundish temperature, T in the present embodiment
tundishit is 1531.9 ~ 1543.8 DEG C;
T
liqudusby the liquidus temperature of casting steel grade, T in the present embodiment
liqudusit is 1511.9 ~ 1518.8 DEG C;
(T
tundish– T
liqudus) be the degree of superheat, (T in the present embodiment
tundish– T
liqudus) be 20 ~ 25 DEG C.
Described in the present embodiment, the Si content of cold steel band is 1 ~ 2.3wt%, and the fusing point of cold steel band is lower 10 ~ 20 DEG C than institute's strand fusing point, described cold steel strip surface oxide-free iron sheet, and surperficial painting antirust oil, described cold thickness of strips is 1 ~ 3mm.
By A=8 ~ 13, V
casting=1.2 ~ 1.4m/min, (T
tundish– T
liqudus)=20 ~ 25 DEG C and T
liqudus=1511.9 ~ 1518.8 DEG C substitute in formula (1), feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus＝0.13～0.30m/min。
The present embodiment the center segregation of continuous casting billet of casting be C level 0.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is greater than 99.7%.
Embodiment 4
A kind of middle low-carbon high strength steel homogenizes the production method of strand.Production method described in the present embodiment is the 40Cr continuous casting billet of the single current round billet continuous casting machine top casting cross section φ 300mm at curved mould.Known: tundish temperature T
tundishit is 1512.8 ~ 1524.7 DEG C; The casting rate V of conticaster
castingbe 1.8 ~ 2.2m/min; The chemical composition of 40Cr continuous casting billet of casting and mass percent (wt%) as shown in table 4:
Table 4
| C | Si | Mn | Ni | Cu | V | Mo | Cr | S | P |
| 0.35～0.4 | 0.25～0.35 | 0.8～1 | 0 | 0 | 0 | 0 | 0～0.35 | 0～0.005 | 0～0.01 |
According to the chemical composition of steel grade shown in table 4 and mass percent (wt%) thereof, the liquidus temperature T of the 40Cr continuous casting billet of casting
liqudus=1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1492.8 ~ 1499.7 DEG C.
Feed cold steel band in Low-carbon High Strength molten steel in curved mould, the feed quantity of cold steel band is 0.6 ~ 0.7wt% of described middle Low-carbon High Strength molten steel.
The vibration frequency feeding the strip feeding machine of cold steel band is 4000 ~ 21000Hz, feeds the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, in the present embodiment, A is 3 ~ 8;
V
castingfor the casting rate of conticaster, V in the present embodiment
castingbe 1.8 ~ 2.2m/min;
T
tundishfor tundish temperature, T in the present embodiment
tundishit is 1512.8 ~ 1524.7 DEG C;
T
liqudusby the liquidus temperature of casting steel grade, T in the present embodiment
liqudusit is 1492.8 ~ 1499.7 DEG C;
(T
tundish– T
liqudus) be the degree of superheat, (T in the present embodiment
tundish– T
liqudus) be 20 ~ 25 DEG C.
Described in the present embodiment, the C content of cold steel band is 0.2 ~ 0.27wt%, and the fusing point of cold steel band is lower 10 ~ 20 DEG C than institute's strand fusing point, described cold steel strip surface oxide-free iron sheet, and surperficial painting antirust oil, described cold thickness of strips is 1 ~ 2mm.
By A=3 ~ 8, V
casting=1.8 ~ 2.2m/min, (T
tundish– T
liqudus)=20 ~ 25 DEG C and T
liqudus=1492.8 ~ 1499.7 DEG C substitute in formula (1), feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus＝0.07～0.29m/min。
The present embodiment the center segregation of continuous casting billet of casting be C level 0.5.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is greater than 99.2%.
Embodiment 5
A kind of middle low-carbon high strength steel homogenizes the production method of strand.Production method described in the present embodiment is the Q345E steel ingot of 300mm × 400mm at 29 tons of ingot mould top casting cross-sectional areas.Known: tundish temperature T
tundishit is 1539.4 ~ 1550.8 DEG C; The casting rate V of conticaster
castingbe 1.4 ~ 1.8m/min; The chemical composition of Q345E steel ingot of casting and mass percent (wt%) as shown in table 5:
Table 5
| C | Si | Mn | Ni | Cu | V | Mo | Cr | S | P |
| 0.15～0.2 | 0.25～0.35 | 1.2～1.35 | 0 | 0 | 0 | 0 | 0 | 0～0.005 | 0～0.01 |
According to the chemical composition of steel grade shown in table 5 and mass percent (wt%) thereof, the liquidus temperature T of the Q345E steel ingot of casting
liqudus=1537-(88C+8Si+5Mn+4Ni+5Cu+2V+2Mo+1.5Cr+25S+30P)=1509.4 ~ 1515.8 DEG C
Feed cold steel band in Low-carbon High Strength molten steel in ingot mould, the feed quantity of cold steel band is 0.7 ~ 1wt% of described middle Low-carbon High Strength molten steel.
The vibration frequency feeding the strip feeding machine of cold steel band is 21000 ~ 35000Hz, feeds the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, in the present embodiment, A is 20 ~ 30;
V
castingfor the casting rate of die casting, V in the present embodiment
castingbe 1.4 ~ 1.8m/min;
T
tundishfor tundish temperature, T in the present embodiment
tundishit is 1539.4 ~ 1550.8 DEG C;
T
liqudusby the liquidus temperature of casting steel grade, T in the present embodiment
liqudusit is 1509.4 ~ 1515.8 DEG C;
(T
tundish– T
liqudus) be the degree of superheat, (T in the present embodiment
tundish– T
liqudus) be 30 ~ 35 DEG C.
Described in the present embodiment, the Si content of cold steel band is 2 ~ 3wt%, and the fusing point of cold steel band is lower 10 ~ 20 DEG C than institute's strand fusing point, described cold steel strip surface oxide-free iron sheet, and surperficial painting antirust oil, described cold thickness of strips is 3 ~ 6mm.
By A=20 ~ 30, V
casting=1.4 ~ 1.8m/min, (T
tundish– T
liqudus)=30 ~ 35 DEG C and T
liqudus=1509.4 ~ 1515 DEG C substitute in formula (1), feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus＝0.55～1.25m/min。
The present embodiment the center segregation of continuous casting billet of casting be C level 0.5.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is greater than 99.7%.
This detailed description of the invention compared with prior art has following good effect:
This detailed description of the invention adopts the foundry engieering of consumable macroscopic view low-temperature receiver, solve the problem reducing melt overheat, correspondingly obtain uniform macrostructure structure, namely by only reducing the mode of liquid molten steel overheat in continuous-casting of steel billet machine crystallizer or ingot mould, obtain the compact crystal structure waiting axle, significantly improve strand both macro and micro institutional framework.
This detailed description of the invention is by cold steel band feeding crystallizer molten steel, thawing heat absorption by cold steel band reduces the degree of superheat of molten steel in crystallizer or ingot mould, improve the crystallization process of molten steel, make the crystallization process from casting billet surface to center become the crystallization process almost simultaneously carried out at section, therefore this detailed description of the invention technique is simple, with low cost and easy to operate.
This detailed description of the invention outstanding feature is: under the condition of meniscus crystallization is not disturbed in guarantee, feed appropriate cold steel band, the feeding speed V of cold steel band
band=A × V
casting× (T
tundish– T
liqudus)/T
liqudus, A is wherein degree of superheat adjustment factor, with conticaster crystallizer size and steel grade chemical composition of casting relevant.Feed the speed V of cold steel band
banddetermination meet two conditions: one is the crystallization nuclei defining required quantity after the cold steel band of feeding, and two is the abundant meltings of cold steel band made in liquid core.Under the vibration of strip feeding machine, the cold steel band of feeding vibrates with the frequency of 50 ~ 35000Hz, improves fusing and the casting blank solidification process of cold steel band, promotes homogeneous nucleation.
This detailed description of the invention significantly can increase nucleus owing to adding macroscopical low-temperature receiver in the melt, namely the quantity of crystallization nuclei is increased, therefore the melting of the cold steel band of feeding makes the molten steel overheat entering crystallizer or ingot mould reduce, nucleus quantity increases, formation condition in axle skeleton and globular crystal tagma significantly improves, and also can reduce the center segregation of continuous casting billet and ingot mould simultaneously.The continuous casting billet non-stop layer segregation cast, that is C level 0 ~ 0.5.The steel plate become with continuous casting billet milling is through ultrasound examination (UltrasonicTest), and qualification rate is more than 99%.
Therefore, this detailed description of the invention has simple, the with low cost and easy to operate feature of technique; Homogenize macrostructure's structure of strand of the middle low-carbon high strength steel produced obtains obvious improvement, remarkable reduction or eliminate axis/center segregation and the underbead crack of chemical element, improve the plasticity and toughness of rolled plate, the HIC that improve Kind of Steels Used in Engineering Structures and corrosion-resisting steel detects qualification rate.
Claims (2)
1. low-carbon high strength steel homogenizes the production method of strand in one kind, it is characterized in that described production method: feed cold steel band in Low-carbon High Strength molten steel in conticaster crystallizer or ingot mould, the feed quantity of cold steel band is 0.3 ~ 1.0wt% of described middle Low-carbon High Strength molten steel;
The vibration frequency feeding the strip feeding machine of cold steel band is 50 ~ 35000Hz; Feed the speed V of cold steel band
band
V
band＝A×V
casting×(T
tundish–T
liqudus)/T
liqudus(1)
In formula (1): A is degree of superheat adjustment factor, A is 3 ~ 30;
V
castingfor the casting rate of conticaster or die casting, m/min;
T
tundishfor tundish temperature, DEG C;
T
liqudusby the liquidus temperature of casting steel grade, DEG C;
(T
tundish– T
liqudus) be the degree of superheat, DEG C.
2. middle low-carbon high strength steel according to claim 1 homogenizes the production method of strand, it is characterized in that: the C content of described cold steel band is 0.2 ~ 0.65wt% or silicone content is 1 ~ 3wt%, the fusing point of described cold steel band than strand fusing point low 3 ~ 30 DEG C, described cold steel strip surface oxide-free iron sheet, surface is coated with antirust oil, and described cold thickness of strips is 1 ~ 6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740946.1A CN104493118B (en) | 2014-12-08 | 2014-12-08 | A kind of middle low-carbon high strength steel homogenizes the production method of strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740946.1A CN104493118B (en) | 2014-12-08 | 2014-12-08 | A kind of middle low-carbon high strength steel homogenizes the production method of strand |
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| CN1970195A (en) * | 2006-12-04 | 2007-05-30 | 刘东业 | Metal continuous casting method and device for carrying out the method |
| CN101624671A (en) * | 2008-07-11 | 2010-01-13 | 中国铝业股份有限公司 | Large-diameter 7005 aluminum alloy round ingot and preparation method thereof |
| CN102211154A (en) * | 2011-05-11 | 2011-10-12 | 中冶南方工程技术有限公司 | Method for improving internal quality of continuous casting and submerged nozzle for implementing method |
| CN102430729A (en) * | 2011-11-15 | 2012-05-02 | 内蒙古包钢钢联股份有限公司 | Method for preparing thinned steel continuous casting round billet crystal grains |
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| WO2005078142A1 (en) * | 2004-02-11 | 2005-08-25 | Tata Steel Limited | A cored wire injection process ih steel melts |
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| CN1970195A (en) * | 2006-12-04 | 2007-05-30 | 刘东业 | Metal continuous casting method and device for carrying out the method |
| CN101624671A (en) * | 2008-07-11 | 2010-01-13 | 中国铝业股份有限公司 | Large-diameter 7005 aluminum alloy round ingot and preparation method thereof |
| CN102211154A (en) * | 2011-05-11 | 2011-10-12 | 中冶南方工程技术有限公司 | Method for improving internal quality of continuous casting and submerged nozzle for implementing method |
| CN102430729A (en) * | 2011-11-15 | 2012-05-02 | 内蒙古包钢钢联股份有限公司 | Method for preparing thinned steel continuous casting round billet crystal grains |
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Application publication date: 20150408 Assignee: Heimer robot (Huangshi) Co.,Ltd. Assignor: WUHAN University OF SCIENCE AND TECHNOLOGY Contract record no.: X2021420000034 Denomination of invention: A production method of homogenized billet of medium and low carbon high strength steel Granted publication date: 20160302 License type: Common License Record date: 20211129 |
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Application publication date: 20150408 Assignee: Wuhan Hanwei Lida Technology Co.,Ltd. Assignor: WUHAN University OF SCIENCE AND TECHNOLOGY Contract record no.: X2022420000074 Denomination of invention: A kind of production method of homogenized casting billet of medium-low carbon and high-strength steel Granted publication date: 20160302 License type: Common License Record date: 20220818 |