CN107377919A - A kind of method for improving bearing steel strand central dense degree - Google Patents
A kind of method for improving bearing steel strand central dense degree Download PDFInfo
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- CN107377919A CN107377919A CN201710595724.9A CN201710595724A CN107377919A CN 107377919 A CN107377919 A CN 107377919A CN 201710595724 A CN201710595724 A CN 201710595724A CN 107377919 A CN107377919 A CN 107377919A
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- weight
- bearing steel
- dense degree
- steel strand
- central dense
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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
-
- 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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
-
- 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
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to a kind of continuous cast method, and in particular to a kind of method for improving bearing steel strand central dense degree.Technical scheme is as follows：A kind of method for improving bearing steel strand central dense degree, in casting process, it is 0.50m/min~0.65m/min to control casting machine pulling rate, control 20 DEG C~30 DEG C of the degree of superheat of tundish molten steel, using solidification end weight under type, carried out under slighter compress and weight by distribution solid rate, under weight when fs=0.9, carried out in fs=1.0 using convex roller under weight.The method provided by the invention for improving bearing steel strand central dense degree, enables the center porosity of bearing steel strand to be effectively controlled, strand central dense degree is improved significantly.
Description
Technical field
The present invention relates to a kind of continuous cast method, and in particular to a kind of method for improving bearing steel strand central dense degree.
Background technology
Bearing steel has antifatigue, wear-resistant, rigidity high and the performance such as certain corrosion resistance, mainly for the manufacture of rolling
Pearl, roller and bearing ring, GCr15 steel are one kind therein.Because bearing steel carbon content and alloy content are higher, freezing range
Temperature change is big, so as to cause to solidify gap length length, therefore serious center segregation or loose can be formed in process of setting.
Center segregation is loose for the influence of the parts such as roller, lasso and little but very big for the spin harm in working surface,
And bearing steel will bear great pressure and frictional force, so having strict requirements to the quality of its strand and stocking, especially
It is the central dense degree that must assure that strand and stocking, is otherwise just difficult to ensure that the safe mass problem of bearing steel.Therefore, eliminate
Strand center porosity and raising strand central dense degree are most important to production Bearing with high properties steel.
Patent application CN201510788995.7 " a kind of method of big cross section Properties of Heavy Rail Steel strand center porosity control ", it is controlled
The degree of superheat of Zhi Zhong Baogangs liquid；In normal casting process, pulling rate is controlled；Depressed in casting process in solidification end；If
Determine the stirring intensity and stirring frequency of M-EMS；Set the stirring intensity and stirring frequency of solidification end；Control knot
Brilliant device cooling water inflow and Water Rate for Secondary Cooling Water.Can effectively it be controlled using the center porosity of the big cross section heavy rail steel billet of this method production
System, remaining internal soundness of strand can obtain effective guarantee.The method changes mainly for big cross section Properties of Heavy Rail Steel to Properties of Heavy Rail Steel quality
It is kind to have certain benefit, but because the carbon content and alloy content difference of GCr15 bearing steels and Properties of Heavy Rail Steel are very big, therefore the patent is not
It is adapted to carbon content and the higher GCr15 bearing steels of alloy content.
Patent application 201610173116.4 " the center porosity control method of 30CrMo circular pipe blank steel strands ", it controls knot
Brilliant device stirring parameter is 350~400A of stir current, 2~4Hz；Solidification end stirring parameter is stir current 200
~300A, 6.0~8.0Hz of frequency；Degree of superheat control range is 15~30 DEG C；Organization of production stove machine matches the pulling rate scope of demand
For 0.75~1.00m/min；Water Rate for Secondary Cooling Water is controlled in 0.21~0.29L/kg steel, and it is mainly for circular pipe blank, to 30CrMo
The improvement of circular pipe blank steel slab quality has certain benefit, but some of center porosity to Continuous Casting Bloom of Bearing Steel and consistency control
Key technology is not directed to.
The content of the invention
The present invention provides a kind of method for improving bearing steel strand central dense degree, enables the center porosity of bearing steel strand
It is effectively controlled, strand central dense degree is improved significantly.
Technical scheme is as follows：
A kind of method for improving bearing steel strand central dense degree, in casting process, it is 0.50m/ to control casting machine pulling rate
Min~0.65m/min, 20 DEG C~30 DEG C of the degree of superheat of tundish molten steel is controlled, using solidification end weight under type, slighter compress
With being carried out under weight by distribution solid rate, under weight when fs=0.9, carry out weight using convex roller in fs=1.0
Under.
The method of described raising bearing steel strand central dense degree, the wherein Soft reduction rate under solidification end weight are
0.03mm/s, pressure range length are 6.1m~7.6m, and single roller maximum reduction is 15mm.
The method of described raising bearing steel strand central dense degree, wherein the convex roller is 6# pulling-straightening rollers, it is described convex
The middle part of type roller is provided with projection, and the described raised and both ends of the convex roller are with gradual curvature curve transition.
Beneficial effects of the present invention are：Press control, reduction are middle again by stablizing casting machine pulling rate, solidification end by the present invention
The integrated use of the technical measures such as bag degree of superheat reduces the center porosity of bearing steel strand, and then improves strand central dense degree,
Improve stocking internal soundness, strand center porosity is controlled effectively, and total quality is good, can meet bearing steel well
Requirement.Very big volume contraction can be produced during casting blank solidification, so needing bigger drafts to compensate strand
Volume contraction, during pressure, strand can be deformed drag, and it is concentrated mainly in the green shell that both sides have solidified, this
Invention uses convex roller solidification end weight Reduction Technology, avoids the green shell that both sides have solidified and produces larger resistance of deformation,
The middle part of strand can be implemented under weight, improve strand central dense degree.
Brief description of the drawings
Fig. 1 is convex roll structure figure.
Embodiment
A kind of method for improving bearing steel strand central dense degree, in casting process, it is 0.50m/ to control casting machine pulling rate
Min~0.65m/min, 20 DEG C~30 DEG C of the degree of superheat of tundish molten steel is controlled, using solidification end weight under type, slighter compress
With being carried out under weight by distribution solid rate, under weight when fs=0.9, carry out weight using convex roller in fs=1.0
Under；Soft reduction rate under solidification end weight is 0.03mm/s, and pressure range length is 6.1m~7.6m, single roller maximum reduction
For 15mm；The convex roller is 6# pulling-straightening rollers, as shown in figure 1, the middle part of the convex roller is provided with projection 1, described raised 1 and institute
The both ends of convex roller are stated with gradual curvature curve transition.
Embodiment 1
Continuous casting cross dimension is 360mm × 450mm GCr15 bearing steels, and casting machine pulling rate is 0.65m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 20 DEG C；Using slighter compress with being pressed under weight by distribution solid rate
Under, under weight when fs=0.9 depress；Under convex roll-in when the solid rate fs=1.0 of strand center depress；Using
Solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range length is 6.1m；Overall reduction 26.00mm, 2#
Drafts 5.00mm, the 5# roller of drafts 3.50mm, 4# the roller slighter compress of drafts 2.00mm, 3# the roller slighter compress of roller slighter compress
The drafts 9.00mm under drafts 5.50mm, 6# roller weight under weight.
After being poured, macroscopic examination is carried out to GCr15 bearing steels Inner Quality of Billet, to be carried out to Inner Quality of Billet
Detection, inspection result show that strand transverse direction low power is rated≤1.0 without obvious shrinkage porosite, centre burst defect, center porosity defect
Level.
Embodiment 2
Continuous casting cross dimension is 360mm × 450mm GCr15 bearing steels, and casting machine pulling rate is 0.60m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 20 DEG C；Using slighter compress with being pressed under weight by distribution solid rate
Under, under weight when fs=0.9 depress；Under convex roll-in when the solid rate fs=1.0 of strand center depress；Using
Solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range length is 6.1m；Overall reduction 25.00mm, 2#
Drafts 5.00mm, the 5# roller of drafts 3.00mm, 4# the roller slighter compress of drafts 1.50mm, 3# the roller slighter compress of roller slighter compress
The drafts 9.00mm under drafts 6.50mm, 6# roller weight under weight.
After being poured, macroscopic examination is carried out to GCr15 bearing steels Inner Quality of Billet, to be carried out to Inner Quality of Billet
Detection, inspection result show that strand transverse direction low power is rated≤1.0 without obvious shrinkage porosite, centre burst defect, center porosity defect
Level.
Embodiment 3
Continuous casting cross dimension is 360mm × 450mm GCr15 bearing steels, and casting machine pulling rate is 0.55m/min, and
Pulling rate is kept to stablize constant, the Metal in Tundish degree of superheat is 30 DEG C；Using slighter compress with being pressed under weight by distribution solid rate
Under, under weight when fs=0.9 depress；Under convex roll-in when the solid rate fs=1.0 of strand center depress；Using
Solidification end weight press control, Soft reduction rate 0.03mm/s, pressure range length is 7.6m, overall reduction 25.00mm；1#
The drafts of drafts 2.00mm, 2# the roller slighter compress of roller slighter compress, 2.50mm, the drafts 3.00mm, 4# of 3# roller slighter compress
The drafts 8.00mm under drafts 5.00mm, 6# roller weight under drafts 4.50mm, 5# the roller weight of roller slighter compress.
After being poured, macroscopic examination is carried out to GCr15 bearing steels Inner Quality of Billet, to be carried out to Inner Quality of Billet
Detection, inspection result show that strand transverse direction low power is rated≤1.0 without obvious shrinkage porosite, centre burst defect, center porosity defect
Level.
Claims (3)
- A kind of 1. method for improving bearing steel strand central dense degree, it is characterised in that in casting process, control casting machine pulling rate For 0.50m/min~0.65m/min, 20 DEG C~30 DEG C of the degree of superheat of tundish molten steel is controlled, using below solidification end weight Formula, carried out by distribution solid rate under slighter compress and weight, under weight when fs=0.9, convex roller is used in fs=1.0 Carry out under weight.
- 2. the method according to claim 1 for improving bearing steel strand central dense degree, it is characterised in that solidification end weight The Soft reduction rate of pressure is 0.03mm/s, and pressure range length is 6.1m~7.6m, and single roller maximum reduction is 15mm.
- 3. the method according to claim 1 for improving bearing steel strand central dense degree, it is characterised in that the convex roller For 6# pulling-straightening rollers, the middle part of the convex roller is provided with projection, and the described raised and both ends of the convex roller are with gradual curvature curve Transition.
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| CN201710595724.9A CN107377919A (en) | 2017-07-20 | 2017-07-20 | A kind of method for improving bearing steel strand central dense degree |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109277542A (en) * | 2018-11-28 | 2019-01-29 | 张家港荣盛炼钢有限公司 | High-carbon steel bloom corner crack control method |
| CN109622905A (en) * | 2019-02-19 | 2019-04-16 | 东北大学 | A kind of bloom continuous casting withdrawal straightening machine high-order moment curve convex roller design method |
| CN109848384A (en) * | 2019-03-04 | 2019-06-07 | 东北大学 | It is a kind of to improve big specification bearing steel bar center portion average grain size method |
| WO2020042923A1 (en) | 2018-08-31 | 2020-03-05 | 宝山钢铁股份有限公司 | Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor |
| WO2020042924A1 (en) | 2018-08-31 | 2020-03-05 | 宝山钢铁股份有限公司 | Light reduction method for continuous casting of bloom plain-barrelled roll-roller combination |
| CN112170798A (en) * | 2020-08-28 | 2021-01-05 | 东北大学 | Production line applied to continuous casting of bloom and forging and rolling method thereof |
| CN112317725A (en) * | 2020-10-28 | 2021-02-05 | 南京钢铁股份有限公司 | Method for improving bearing steel casting blank core looseness and bidirectional heavy pressing device |
| CN113084110A (en) * | 2021-03-04 | 2021-07-09 | 天津荣程联合钢铁集团有限公司 | Method for reducing carbon segregation of alloy steel |
| CN114226671A (en) * | 2021-12-20 | 2022-03-25 | 宝武杰富意特殊钢有限公司 | Bearing steel and production method thereof, and bearing ring and production method thereof |
| CN115058645A (en) * | 2022-05-14 | 2022-09-16 | 江阴兴澄特种钢铁有限公司 | Continuous casting round billet for wind power large-wall-thickness low-cost low-temperature-resistant tower cylinder flange and manufacturing method thereof |
| CN115608938A (en) * | 2022-09-27 | 2023-01-17 | 东北大学 | Continuous casting rectangular billet allotyping method for H-shaped steel rolling production |
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Cited By (19)
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| CN110871264B (en) * | 2018-08-31 | 2021-06-15 | 宝山钢铁股份有限公司 | Method for manufacturing continuous-casting bloom continuous-curvature convex roller |
| JP2021535839A (en) * | 2018-08-31 | 2021-12-23 | 宝山鋼鉄股▲分▼有限公司 | Continuous curvature convex roll for bloom continuous casting and its manufacturing method |
| US11298744B2 (en) | 2018-08-31 | 2022-04-12 | Baoshan Iron & Steel Co., Ltd. | Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor |
| WO2020042923A1 (en) | 2018-08-31 | 2020-03-05 | 宝山钢铁股份有限公司 | Continuous-curvature convex roll for continuously casting bloom, and manufacturing method therefor |
| WO2020042924A1 (en) | 2018-08-31 | 2020-03-05 | 宝山钢铁股份有限公司 | Light reduction method for continuous casting of bloom plain-barrelled roll-roller combination |
| CN110871264A (en) * | 2018-08-31 | 2020-03-10 | 宝山钢铁股份有限公司 | Method for manufacturing continuous-casting bloom continuous-curvature convex roller |
| US11207729B2 (en) | 2018-08-31 | 2021-12-28 | Baoshan Iron & Steel Co., Ltd. | Light reduction method for continuous casting of bloom plain-barrelled roll-roller combination |
| JP7135205B2 (en) | 2018-08-31 | 2022-09-12 | 宝山鋼鉄股▲分▼有限公司 | CONTINUOUS CURVATURE CONVEYING ROLL FOR BLOOM CONTINUOUS CASTING AND METHOD FOR MANUFACTURING THE SAME |
| CN109277542A (en) * | 2018-11-28 | 2019-01-29 | 张家港荣盛炼钢有限公司 | High-carbon steel bloom corner crack control method |
| CN109622905A (en) * | 2019-02-19 | 2019-04-16 | 东北大学 | A kind of bloom continuous casting withdrawal straightening machine high-order moment curve convex roller design method |
| CN109848384A (en) * | 2019-03-04 | 2019-06-07 | 东北大学 | It is a kind of to improve big specification bearing steel bar center portion average grain size method |
| CN112170798B (en) * | 2020-08-28 | 2021-07-16 | 东北大学 | Production line applied to continuous casting of bloom and forging and rolling method thereof |
| CN112170798A (en) * | 2020-08-28 | 2021-01-05 | 东北大学 | Production line applied to continuous casting of bloom and forging and rolling method thereof |
| CN112317725A (en) * | 2020-10-28 | 2021-02-05 | 南京钢铁股份有限公司 | Method for improving bearing steel casting blank core looseness and bidirectional heavy pressing device |
| CN113084110A (en) * | 2021-03-04 | 2021-07-09 | 天津荣程联合钢铁集团有限公司 | Method for reducing carbon segregation of alloy steel |
| CN113084110B (en) * | 2021-03-04 | 2022-07-12 | 天津荣程联合钢铁集团有限公司 | Method for reducing carbon segregation of alloy steel |
| CN114226671A (en) * | 2021-12-20 | 2022-03-25 | 宝武杰富意特殊钢有限公司 | Bearing steel and production method thereof, and bearing ring and production method thereof |
| CN115058645A (en) * | 2022-05-14 | 2022-09-16 | 江阴兴澄特种钢铁有限公司 | Continuous casting round billet for wind power large-wall-thickness low-cost low-temperature-resistant tower cylinder flange and manufacturing method thereof |
| CN115608938A (en) * | 2022-09-27 | 2023-01-17 | 东北大学 | Continuous casting rectangular billet allotyping method for H-shaped steel rolling production |
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Application publication date: 20171124 |