CN110523942A - A kind of control method improving high-carbon-chromium bearing steel bloom internal flaw - Google Patents
A kind of control method improving high-carbon-chromium bearing steel bloom internal flaw Download PDFInfo
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- CN110523942A CN110523942A CN201910809310.0A CN201910809310A CN110523942A CN 110523942 A CN110523942 A CN 110523942A CN 201910809310 A CN201910809310 A CN 201910809310A CN 110523942 A CN110523942 A CN 110523942A
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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
- B22D11/16—Controlling or regulating processes or operations
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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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Abstract
The invention discloses a kind of control methods for improving high-carbon-chromium bearing steel bloom internal flaw, are cast into the big chamfering bloom with wick-containing including molten steel, control continuous casting parameter, implement slighter compress technique to the big chamfering bloom with wick-containing.The present invention controls continuous casting billet corner and the wide face angle of slab is 30-40 °, the length of the hypotenuse 45-60mm；Control 15-30 DEG C of the Metal in Tundish degree of superheat, pulling rate 0.70-0.85m/min；Dynamic soft-reduction and static soft reduction are implemented respectively to the big chamfering continuous casting billet with wick-containing.The present invention solves the internal flaws such as high-carbon-chromium bearing steel bloom pressure crackle, center segregation, high-carbon-chromium bearing steel bloom macroscopic examination: 0-0.5 grades of center porosity, 0.5-1.0 grades of center segregation, 0-0.5 grades of shrinkage cavity, 0-0.5 grades of middle crack, 0-0.5 grades of centre burst, equiaxial crystal ratio 55-68%；Continuous casting billet Central Carbon Segregation index 0.95-1.06.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of control for improving high-carbon-chromium bearing steel bloom internal flaw
Method processed.
Background technique
Progress with continuous casting technology and the requirement to product quality are promoted, and casting blank cross-section size is intended to large size
Change.It is center segregation, loose and intermediate split especially for high-carbon steel grade but due to the build-in attribute of molten steel each element solidification
The internal flaws such as line are difficult to control, and cause strong influence to product quality.
To improve continuous casting billet internal flaw, electromagnetic agitating technology, heating tundish Prepared by Low Superheat Pouring technology, solidification end
Reduction Technology etc. is developed and is applied successfully in succession, and continuous casting billet internal soundness has obtained very big improvement, especially solidification end and depressed
Technology, so that the control of continuous casting billet center segregation generates qualitative leap.But the larger pressure needed for center portion segregation improves acts on and pressure
Tensile stress bring pressure crackle contradictory problems will be born in intermediate region when lower becomes the new problem of continuous casting, and conventional soft reduction process is usual
It is difficult to obtain that center segregation is light, continuous casting billet without internal pressure crackle, especially solid-liquid two-phase region is long, brittle temperature range is big
High-carbon steel.
Publication number CN103121092A proposes a kind of continuous casting blooms slighter compress technique based on end electromagnetic agitation, should
Technique installs end electromagnetic stirring device after secondary cooling area for continuous casting, utilizes the dual work of end electromagnetic agitation and slighter compress technique
It for improving the center portion quality of slab, while can effectively avoid the problem that generating internal fissure because of inner arc layback stress, but should
Method need to increase end electromagnetic stirring equipment investment, simultaneously because end is stirred, equipment operating distance is short, and this method is to steel grade and drawing
The adaptability of speed is poor.
Publication number CN101642774A proposes a kind of beating steel GCr15 bloom continuous casting dynamic soft reduction process, utilizes casting
The variation of base center solid rate solves the center segregation of bearing steel bloom, center porosity, central pipe to control drafts
Equal Inner Quality of Billet problem, this method improve slab center portion quality to a certain extent, but are only 0.40- in center solid rate
Pressure in 0.97 range, and since pressure efficiency is lower, it is also easy to produce pressure crackle, it is difficult to balance continuous casting billet middle crack and center portion
The paradox problem of quality.
Publication number CN102873287A proposes continuous casting billet and its continuous casting crystallizer copper pipe and the casting of a kind of band longitudinal direction boss
Method, with outwardly projecting longitudinal boss, boss is depressed when depressing in end at the continuous casting billet middle part of this method production, this
Method can save casting-rolling force, while reduce the generation of solidification end pressure crackle.But this method mold shape complexity is to adding
Work is more demanding, while sufficient roller is few to slab contact area, and support degree is insufficient, Yi Fasheng bleed-out accident.
Publication number CN107537987A proposes a kind of continuous casting alloy steel bloom convex combination roller and heavy soft reduction process, passes through
Aximal deformation value pressure is implemented to slab, can effectively solve the internal flaws such as segregation and loose, shrinkage cavity.But this method is to hydraulic system
It is more demanding while unknown to the improvement result of pressure crackle.
Publication number CN105618481A proposes that a kind of convex roller of continuous casting billet preheats rolling equipment and technique, is preheated using continuous casting billet
Convex rolling system realization is carried out to slab to be effectively improved Inner Quality of Billet.But this method equipment investment is larger, and slab is complete
Depressed after full solidification, only to loose, shrinkage cavity the defects of it is effective, center portion segregation can not be effectively improved.
Many documents show that scholar carries out the work in the optimization of continuous casting billet geomery, especially big chamfering continuous casting billet, but
In terms of research work all concentrates on the quality control on the surface such as continuous casting billet corner defect, to bloom especially internal flaw controlling party
The research in face has not been reported.
In conclusion the control method of exploitation high-carbon-chromium bearing steel bloom internal flaw, realizes and lacks to bloom inside
Control is fallen into, the continuous casting billet of center segregation gently, without internal pressure crackle, the especially long, brittle temperature zone to solid-liquid two-phase region are obtained
Between big strand casted from high carbon steel production, there is important meaning.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of controls for improving high-carbon-chromium bearing steel bloom internal flaw
Method.The invention is by being cast into the big chamfering bloom with wick-containing, control continuous casting parameter, to the big chamfering with wick-containing for molten steel
Bloom implements the improvement and implementation of slighter compress technique, solves high-carbon-chromium bearing steel bloom pressure crackle, center segregation etc.
Internal flaw problem.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of improvement high-carbon-chromium bearing steel bloom
The control method of internal flaw, the control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 30-40 °, and continuous casting billet the length of the hypotenuse is 45-60mm；
(2) continuous casting parameter is controlled: 15-30 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.70-0.85m/min, crystallizer electromagnetism
Stir current intensity 400-500A, frequency 1.2-2.4Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
It determines, corresponding relationship is as follows:
When slab center solid ratef S When < 0.3, under not firm pressure；
When 0.30≤f S When≤0.40, drafts 1.0mm；
When 0.45≤f S When≤0.50, drafts 2.0mm；
When 0.60≤f S When≤0.65, drafts 3.0mm；
When 0.75≤f S When≤0.80, drafts 4.0mm；
When 0.90≤f S When≤0.95, drafts 3.0mm；
Slab center solid rate is 0.40 < at pressure rollerf S < 0.45,0.50 <f S < 0.60,0.65 <f S < 0.75,
0.80 <f S When < 0.90, drafts is the numerical value calculated using linear interpolation method；
B. the static soft reduction stage only implements pressure, drafts 1.5- at the next roller for finally implementing dynamic soft-reduction roller
2.5mm。
In the present invention, when center solid rate be 0.95≤f S When≤1.00, drafts is simultaneously not fixed, it corresponds to following b
The static soft reduction stage, if whether pressure is that last dynamic soft-reduction roller determines by previous roller.
The high-carbon-chromium bearing steel bloom chemical component composition and its quality percentage of control method production of the present invention contain
Amount are as follows: C:0.95-1.05%, Si:0.15-0.35%, Mn:0.25-0.45%, Cr:1.40-1.65%, P≤0.025%, S≤
0.020%, Ti≤0.0050%, other is Fe and inevitable micro impurity element.
The high-carbon-chromium bearing steel bloom macroscopic examination of control method production of the present invention: 0-0.5 grades of center porosity, in
0.5-1.0 grades of heart segregation, 0-0.5 grades of shrinkage cavity, 0-0.5 grades of middle crack, 0-0.5 grades of centre burst, equiaxial crystal ratio 55-68%.
The continuous casting billet Central Carbon Segregation index 0.95-1.06 of control method production of the present invention.Continuous casting billet center carbon is inclined
Analysing index is to calculate gained, carbon segregation index C0=C/CMolten steel, i.e. the carbon content at continuous casting billet center heat of molten steel corresponding with continuous casting billet
Practical carbon content ratio.
Linear interpolation of the present invention is a kind of simple difference approach, if function y=f (x) is in two o'clock x0, x1Value point
It Wei not y0, y1, then function y=a0+a1X meets y (x0)=y0, y (x1)=y1, then for y=f (x) corresponding to y=f (x) any point x=
y0+(y1-y0)×[(x-x0)/(x1-x0)]。
Such as: slab center solid rate is 0.53, drafts according to 0.45≤f S < 0.50 and 0.60≤f S < 0.65 is corresponding
Drafts carry out linear interpolation calculating.At this point, x0=0.5, y0=2.0mm(0.45≤f S Corresponding drafts when < 0.50), x1
=0.6, y1=3.0mm(0.60≤f S The corresponding drafts of < 0.65), x=0.53.Drafts y=y0+(y1-y0)×[(x-x0)/
(x1-x0)]=2.0+(3.0-2.0) × [(0.53-0.50)/(0.60-0.50)]=2.3mm.
Slab center solid rate is 0.85, drafts according to 0.75≤f S < 0.80 and 0.90≤f S The corresponding pressure of < 0.95
Lower amount carries out linear interpolation calculating.At this point, x0=0.8, y0=4.0mm(0.75≤f S Corresponding drafts when < 0.80), x1=
0.9, y1=3.0mm(0.90≤f S The corresponding drafts of < 0.95), x=0.85.Drafts y=y0+(y1-y0)×[(x-x0)/
(x1-x0)]=4.0+(3.0-4.0) × [(0.85-0.80)/(0.90-0.80)]=3.5mm.
The beneficial effects of adopting the technical scheme are that the 1, present invention is by being cast into molten steel with wick-containing
Big chamfering bloom, control continuous casting parameter, optimization slighter compress technique, solve high-carbon-chromium bearing steel bloom pressure crackle, in
The internal flaws problems such as heart segregation.2, the present invention improves the control method of high-carbon-chromium bearing steel bloom internal flaw, slab pressure
Lower technique be divided into certain solid rate during dynamic soft-reduction with close to Coagulated hemothorax when static soft reduction, due to continuous casting billet shape
The variation of shape, big chamfering continuous casting blooms interior zone depress improved efficiency, and intermediate region slab tensile stress mitigates, center portion stress
Increase, can be greatly reduced the generation of slab pressure crackle, while center portion increased quality, static draught when close to Coagulated hemothorax,
The stabilization to casting blank solidification terminal is helped to realize, the segregation of stabilizing continuous casting base center portion is horizontal, to promote the interior of continuous casting billet
Portion's quality.3, the high-carbon-chromium bearing steel bloom macroscopic examination of control method production of the present invention: 0-0.5 grades of center porosity, center
0.5-1.0 grades of segregation, 0-0.5 grades of shrinkage cavity, 0-0.5 grades of middle crack, 0-0.5 grades of centre burst, equiaxial crystal ratio 55-68%；Continuous casting
Base Central Carbon Segregation index 0.95-1.06.
Detailed description of the invention
Fig. 1 is continuous casting blooms cross dimensions schematic diagram.
Wherein: 1 is the angle in big chamfering continuous casting billet corner and the wide face of slab；2 be big chamfering continuous casting billet narrow side length；3 are
Big chamfering continuous casting billet corner the length of the hypotenuse；4 be big chamfering continuous casting billet width edge length.
Specific embodiment
Present invention will be explained in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 30 °, and continuous casting billet the length of the hypotenuse is 60mm；
(2) continuous casting parameter is controlled: 15-25 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.70m/min, M-EMS
Current strength 400A, frequency 2.4Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
2.5mm；Concrete condition is shown in Table 1；
1 embodiment of table, 1 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.58 | 0.75 | 0.88 | 0.95 | 1.00 | 1.00 | 1.00 |
| Drafts/mm | 2.8 | 4.0 | 3.2 | 3.0 | 2.5 | 0 | 0 |
Note: 1#-4# is dynamic soft-reduction, and 5# is static soft reduction.
The high-carbon-chromium bearing steel that the present embodiment improves the control method production of high-carbon-chromium bearing steel bloom internal flaw is big
Square billet macroscopic examination the results are shown in Table 2；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
2 embodiment of table, 1 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0.5 | 1.0 | 0 | 0 | 0 | 58 |
| Slab -2 | 0.5 | 1.0 | 0 | 0.5 | 0 | 60 |
| Slab -3 | 0.5 | 0.5 | 0.5 | 0 | 0 | 55 |
Continuous casting billet Central Carbon Segregation index: 0.97-1.05.
Embodiment 2
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 40 °, and continuous casting billet the length of the hypotenuse is 45mm；
(2) continuous casting parameter is controlled: 20-30 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.85m/min, M-EMS
Current strength 500A, frequency 1.2Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
1.5mm；Concrete condition is shown in Table 3；
3 embodiment of table, 2 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.27 | 0.43 | 0.58 | 0.70 | 0.81 | 0.90 | 1.00 |
| Drafts/mm | 0 | 1.6 | 2.8 | 3.5 | 3.9 | 3.0 | 1.5 |
Note: 2#-6# is dynamic soft-reduction, and 7# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 4；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
4 embodiment of table, 2 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0.5 | 1.0 | 0.5 | 0.5 | 0 | 64 |
| Slab -2 | 0.5 | 0.5 | 0 | 0.5 | 0 | 65 |
| Slab -3 | 0.5 | 0.5 | 0 | 0 | 0 | 68 |
Continuous casting billet Central Carbon Segregation index: 0.96-1.06.
Embodiment 3
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 32 °, and continuous casting billet the length of the hypotenuse is 50mm；
(2) continuous casting parameter is controlled: 18-23 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.75m/min, M-EMS
Current strength 430A, frequency 1.5Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
1.8mm；Concrete condition is shown in Table 5；
5 embodiment of table, 3 conticaster solidification end respectively depresses center solid rate at roller and drafts is
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.47 | 0.63 | 0.77 | 0.89 | 0.97 | 1.0 | 1.0 |
| Drafts/mm | 2.0 | 3.0 | 4.0 | 3.1 | 1.8 | 0 | 0 |
Note: 1#-4# is dynamic soft-reduction, and 5# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 6；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
6 embodiment of table, 3 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0.5 | 0.5 | 0 | 0 | 0.5 | 55 |
| Slab -2 | 0.5 | 0.5 | 0.5 | 0.5 | 0 | 59 |
| Slab -3 | 0 | 0.5 | 0.5 | 0 | 0 | 62 |
Continuous casting billet Central Carbon Segregation index: 0.95-1.05.
Embodiment 4
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 36 °, and continuous casting billet the length of the hypotenuse is 55mm；
(2) continuous casting parameter is controlled: 20-25 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.80m/min, M-EMS
Current strength 480A, frequency 2.0Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
1.5mm；Concrete condition is shown in Table 7；
7 embodiment of table, 4 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.36 | 0.53 | 0.68 | 0.81 | 0.91 | 0.95 | 1.00 |
| Drafts/mm | 1.0 | 2.3 | 3.3 | 3.9 | 3.0 | 3.0 | 1.5 |
Note: 1#-6# is dynamic soft-reduction, and 7# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 8；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
8 embodiment of table, 4 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0 | 0.5 | 0.5 | 0.5 | 0 | 68 |
| Slab -2 | 0.5 | 0.5 | 0 | 0.5 | 0.5 | 63 |
| Slab -3 | 0.5 | 0.5 | 0 | 0 | 0 | 62 |
Continuous casting billet Central Carbon Segregation index: 0.95-1.04.
Embodiment 5
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 35 °, and continuous casting billet the length of the hypotenuse is 57mm；
(2) continuous casting parameter is controlled: 16-19 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.83m/min, M-EMS
Current strength 450A, frequency 1.8Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
1.5mm；Concrete condition is shown in Table 9；
9 embodiment of table, 5 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.29 | 0.45 | 0.60 | 0.73 | 0.83 | 0.91 | 1.00 |
| Drafts/mm | 0 | 2.0 | 3.0 | 3.8 | 3.7 | 3.0 | 1.5 |
Note: 2#-6# is dynamic soft-reduction, and 7# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 10；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
10 embodiment of table, 5 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0 | 0.5 | 0 | 0 | 0 | 59 |
| Slab -2 | 0.5 | 0.5 | 0 | 0 | 0 | 62 |
| Slab -3 | 0.5 | 0.5 | 0.5 | 0.5 | 0 | 60 |
Continuous casting billet Central Carbon Segregation index: 0.97-1.05.
Embodiment 6
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 38 °, and continuous casting billet the length of the hypotenuse is 48mm；
(2) continuous casting parameter is controlled: 17-21 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.72m/min, M-EMS
Current strength 415A, frequency 2.3Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
2.0mm；Concrete condition is shown in Table 11；
11 embodiment of table, 6 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.60 | 0.75 | 0.88 | 0.94 | 0.99 | 1.0 | 1.0 |
| Drafts/mm | 3.00 | 4.0 | 3.2 | 3.0 | 2.0 | 0 | 0 |
Note: 1#-2# is dynamic soft-reduction, and 5# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 12；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
12 embodiment of table, 6 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0.5 | 1.0 | 0.5 | 0 | 0 | 59 |
| Slab -2 | 0.5 | 0.5 | 0.5 | 0 | 0 | 62 |
| Slab -3 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 61 |
Continuous casting billet Central Carbon Segregation index: 0.98-1.06.
Embodiment 7
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 39 °, and continuous casting billet the length of the hypotenuse is 53mm；
(2) continuous casting parameter is controlled: 26-29 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.81m/min, M-EMS
Current strength 465A, frequency 1.4Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
2.0mm；Concrete condition is shown in Table 13；
13 embodiment of table, 7 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.34 | 0.51 | 0.65 | 0.78 | 0.88 | 0.95 | 1.00 |
| Drafts/mm | 1.0 | 2.1 | 3.0 | 4.0 | 3.2 | 2.0 | 0 |
Note: 1#-5# is dynamic soft-reduction, and 6# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 14；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
14 embodiment of table, 7 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 57 |
| Slab -2 | 0.5 | 0.5 | 0 | 0 | 0 | 58 |
| Slab -3 | 0.5 | 0.5 | 0 | 0 | 0 | 60 |
Continuous casting billet Central Carbon Segregation index: 0.97-1.05.
Embodiment 8
The present embodiment improve high-carbon-chromium bearing steel bloom internal flaw control method the following steps are included:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 31 °, and continuous casting billet the length of the hypotenuse is 46mm；
(2) continuous casting parameter is controlled: 22-27 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.73m/min, M-EMS
Current strength 425A, frequency 1.6Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
To determine；B. the static soft reduction stage, only implement pressure at the next roller for finally implementing dynamic soft-reduction roller, drafts is
2.0mm；Concrete condition is shown in Table 15；
15 embodiment of table, 8 conticaster solidification end respectively depresses center solid rate and drafts at roller
| Depress roller | 1# | 2# | 3# | 4# | 5# | 6# | 7# |
| Center solid rate | 0.58 | 0.75 | 0.87 | 0.94 | 0.99 | 1.0 | 1.0 |
| Drafts/mm | 2.8 | 4.0 | 3.3 | 3.0 | 2.0 | 0 | 0 |
Note: 1#-4# is dynamic soft-reduction, and 5# is static soft reduction；
The present embodiment improves the high-carbon-chromium bearing steel bloom of the control method production of high-carbon-chromium bearing steel bloom internal flaw
Macroscopic examination the results are shown in Table 16；High-carbon-chromium bearing steel bloom chemical component composition and its mass percentage are shown in Table 17.
16 embodiment of table, 8 high-carbon-chromium bearing steel bloom macroscopic examination result
| Serial number | Center porosity (grade) | Center segregation (grade) | Shrinkage cavity (grade) | Middle crack (grade) | Centre burst (grade) | Equiaxial crystal ratio (%) |
| Slab -1 | 0.5 | 1.0 | 0.5 | 0 | 0 | 59 |
| Slab -2 | 0.5 | 1.0 | 0.5 | 0 | 0 | 60 |
| Slab -3 | 0.5 | 0.5 | 0.5 | 0.5 | 0 | 61 |
Continuous casting billet Central Carbon Segregation index: 0.96-1.06.
17 embodiment 1-8 high-carbon-chromium bearing steel bloom chemical component of table composition and its mass percentage (%)
| Embodiment | C | Si | Mn | Cr | P | S | Ti |
| 1 | 1.02 | 0.22 | 0.29 | 1.42 | 0.019 | 0.012 | 0.0028 |
| 2 | 0.97 | 0.19 | 0.32 | 1.47 | 0.023 | 0.009 | 0.0032 |
| 3 | 0.99 | 0.28 | 0.37 | 1.53 | 0.015 | 0.017 | 0.0041 |
| 4 | 1.04 | 0.17 | 0.42 | 1.40 | 0.016 | 0.011 | 0.0049 |
| 5 | 1.01 | 0.31 | 0.25 | 1.58 | 0.013 | 0.015 | 0.0037 |
| 6 | 0.95 | 0.35 | 0.40 | 1.65 | 0.020 | 0.013 | 0.0050 |
| 7 | 1.03 | 0.20 | 0.34 | 1.63 | 0.010 | 0.020 | 0.0043 |
| 8 | 1.05 | 0.15 | 0.45 | 1.56 | 0.025 | 0.018 | 0.0031 |
Ingredient surplus is Fe and inevitable micro impurity element in table 17.
The control method of above-described embodiment high-carbon-chromium bearing steel bloom internal flaw is realized to bloom internal flaw control
System obtains the continuous casting billet of center segregation gently, without internal pressure crackle.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (4)
1. a kind of control method for improving high-carbon-chromium bearing steel bloom internal flaw, which is characterized in that the control method packet
Include following steps:
(1) molten steel is cast into the big chamfering bloom with wick-containing: continuous casting billet 280 × 325mm of size, continuous casting billet corner and slab
Wide face angle control is 30-40 °, and continuous casting billet the length of the hypotenuse is 45-60mm；
(2) continuous casting parameter is controlled: 15-30 DEG C of the Metal in Tundish degree of superheat of control, pulling rate 0.70-0.85m/min, crystallizer electromagnetism
Stir current intensity 400-500A, frequency 1.2-2.4Hz；
(3) slighter compress is implemented to the big chamfering bloom with wick-containing, is divided into two stages of dynamic draught and static draught:
A. dynamic soft-reduction stage, single rack time depress roller drafts by the center solid rate of the corresponding bloom in roller position place
It determines, corresponding relationship is as follows:
When slab center solid ratef S When < 0.3, under not firm pressure；
When 0.30≤f S When≤0.40, drafts 1.0mm；
When 0.45≤f S When≤0.50, drafts 2.0mm；
When 0.60≤f S When≤0.65, drafts 3.0mm；
When 0.75≤f S When≤0.80, drafts 4.0mm；
When 0.90≤f S When≤0.95, drafts 3.0mm；
Slab center solid rate is 0.40 < at pressure rollerf S < 0.45,0.50 <f S < 0.60,0.65 <f S < 0.75,
0.80 <f S When < 0.90, drafts is the numerical value calculated using linear interpolation method；
B. the static soft reduction stage only implements pressure, drafts 1.5- at the next roller for finally implementing dynamic soft-reduction roller
2.5mm。
2. a kind of control method for improving high-carbon-chromium bearing steel bloom internal flaw according to claim 1, feature
It is, the high-carbon-chromium bearing steel bloom chemical component composition and its mass percentage of the control method production are as follows: C:
0.95-1.05%, Si:0.15-0.35%, Mn:0.25-0.45%, Cr:1.40-1.65%, P≤0.025%, S≤0.020%, Ti≤
0.0050%, other is Fe and inevitable micro impurity element.
3. a kind of control method for improving high-carbon-chromium bearing steel bloom internal flaw according to claim 1, feature
It is, the high-carbon-chromium bearing steel bloom macroscopic examination of the control method production: 0-0.5 grades of center porosity, center segregation
0.5-1.0 grades, 0-0.5 grades of shrinkage cavity, 0-0.5 grades of middle crack, 0-0.5 grades of centre burst, equiaxial crystal ratio 55-68%.
4. a kind of controlling party of improvement high-carbon-chromium bearing steel bloom internal flaw according to claim 1 to 3
Method, which is characterized in that the continuous casting billet Central Carbon Segregation index 0.95-1.06 of the control method production.
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| CN110777300A (en) * | 2019-12-05 | 2020-02-11 | 宝钢特钢韶关有限公司 | Method for manufacturing high-carbon chromium bearing steel |
| CN111136228A (en) * | 2020-01-07 | 2020-05-12 | 邢台钢铁有限责任公司 | Control method for improving transverse cracks of corners of continuous casting billet |
| CN112662832A (en) * | 2020-12-18 | 2021-04-16 | 芜湖新兴铸管有限责任公司 | Production method of special-section square billet of high-carbon chromium bearing steel |
| CN114012055A (en) * | 2021-11-11 | 2022-02-08 | 建龙北满特殊钢有限责任公司 | Continuous casting process of rectangular bloom of high-homogeneity high-carbon chromium bearing steel |
| CN114734010A (en) * | 2022-03-18 | 2022-07-12 | 首钢京唐钢铁联合有限责任公司 | Production method for thin slab continuous casting and rolling on-line casting blank thinning |
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