CN104741560B - A kind of method reducing the transverse corner crack stricture of vagina of steel containing niobium - Google Patents
A kind of method reducing the transverse corner crack stricture of vagina of steel containing niobium Download PDFInfo
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Abstract
The present invention relates to metallurgy industry continuous casting steel machine field, particularly to a kind of method reducing the transverse corner crack stricture of vagina of steel containing niobium, including：Using leptoprosopy for double tapered chamfer crystallizer manufacture steel containing niobium；The N content controlling molten steel is less than or equal to 50ppm, and Nb content is less than or equal to 0.12%.The water flow velocity in the tank of crystallizer width face is controlled to be more than the water flow velocity in leptoprosopy tank；Cool down strand using two cold-zones, control two cold-zone specific waters are 0.55～0.80L/kg.The ratio of the total Water of the total Water of control 2～4 area's cooling waters and 6～8 area's cooling waters is 0.6～1.0.The inflow temperature controlling crystallizer is 28～32 DEG C；The degree of superheat controlling crystallizer is narrow degree of superheat scope, controls the protection slag melting point in crystallizer to be less than or equal to 1150 DEG C；The molten steel viscosity in crystallizer is controlled to be less than or equal to 0.140pa s (viscosity numbers at 1300 DEG C).The method of minimizing steel containing the niobium transverse corner crack stricture of vagina that the present invention provides, can be good at solving the problems, such as that Nb content easily produces transverse crack less than or equal to 0.12% strand corner.
Description
Technical field
The present invention relates to metallurgy industry continuous casting steel machine field, particularly to a kind of side reducing the transverse corner crack stricture of vagina of steel containing niobium
Method.
Background technology
With the development of continuous casting technology, sheet billet continuous casting producing line needs to produce the steel grade of high-quality, pours the content of niobium in cast steel
Progressively increase, this kind of steel grade easily produces transverse corner crack stricture of vagina.In order to solve the problems, such as strand transverse corner crack stricture of vagina, domestic and international enterprise takes
Adjustment molten steel composition, optimization secondary cooling zone cooling technique etc., but DeGrain.In order to solve the problems, such as strand transverse corner crack stricture of vagina,
In recent years, part continuous casting crystallizer for plate billet start apply chamfer crystallizer produced, but due to metal in crystallizer
Coagulating property is unintelligible, and the chamfer crystallizer unreasonable structure of design and processing parameter matching be not good, is therefore only capable of solution niobium and contains
Measure the problem of the relatively low corner crack of steel containing niobium.For the higher steel containing niobium of content of niobium (as content of niobium is more than or equal to
0.035%), transverse corner crack stricture of vagina is still difficult to eliminate, and has had a strong impact on the quality containing niobium steel.
Content of the invention
The technical problem to be solved is to provide a kind of method that can reduce the transverse corner crack stricture of vagina of steel containing niobium.
For solving above-mentioned technical problem, the invention provides a kind of method reducing the transverse corner crack stricture of vagina of steel containing niobium, including：Adopt
The chamfer crystallizer manufacture steel containing niobium being double tapered with leptoprosopy；The N content controlling molten steel is less than or equal to 50ppm, and controls
The Nb content of described molten steel is less than or equal to 0.12%；The water flow velocity in the wide face tank of described crystallizer is controlled to be more than described knot
Water flow velocity in the leptoprosopy tank of brilliant device；Cool down strand using two cold-zones, control two cold-zone specific waters are 0.55～0.80L/kg；
Described two cold-zones are made up of 10 subregions, respectively 1 area, 2nd area, 3rd area, 4th area, 5th area, 6th area, 7th area, 8th area, 9th area and 10th area, wherein
1st～8 area is sufficient roller, vertical section, bending section, straightening section region cooling water, and 9th area, 10th area are horizontal segment region；Control 2nd～4 area cold
But the ratio of the total Water of the total Water of water and 6～8 area's cooling waters is 0.6～1.0.The inflow temperature controlling described crystallizer is
28～32 DEG C；Control cast molten steel when the degree of superheat be 20～30 DEG C, control described crystallizer in protection slag melting point be less than or
Equal to 1150 DEG C；The molten steel viscosity in described crystallizer is controlled to be less than or equal to 0.140pa s, the viscosity of described molten steel is
Viscosity number at 1300 DEG C.
Further, the mould taper control suitable for reading of described crystallizer is 1.36～1.80%, the lower prostomum degree of described crystallizer
Control 0.85～1.3%.
Further, the water flow velocity in the wide face tank of described crystallizer is 7.5～9.5m/s, the leptoprosopy of described crystallizer
Water flow velocity in tank is 7.3～9.0m/s.
Further, also include：The fluctuating temperature scope in described crystallizer is controlled to be 0～6 DEG C.
Further, also include：The water yield controlling distribution in the leptoprosopy fillet surface of described crystallizer accounts for leptoprosopy total Water
30%～50%.
Further, also include：The pulling rate controlling strand is less than or equal to the minimizing of 1.4m/min present invention offer containing niobium
The method of steel transverse corner crack stricture of vagina, by using leptoprosopy for double tapered chamfer crystallizer, in conjunction with conical degree of crystallizer and crystallizer water
The state modulator such as flow, can be good at solution Nb content and easily produce asking of transverse crack less than or equal to 0.12% strand corner
Topic.The method of minimizing steel containing the niobium transverse corner crack stricture of vagina that the present invention provides, can improve the heat transfer of strand corner, decrease corner stress,
Strengthen the solidification uniformity of green shell at fillet surface, the steel grade that the method is less than or equal to 0.12% for Nb content simultaneously is all suitable
With being effectively controlled strand corner defect and occurring.
Brief description
Fig. 1 is the top view of chamber crystallizer narrow-surface copper provided in an embodiment of the present invention；
Fig. 2 is the K-K of chamber crystallizer narrow-surface copper in Fig. 1 to generalized section；
Fig. 3 is the J-J of chamber crystallizer narrow-surface copper in Fig. 1 to generalized section.
Specific embodiment
The present invention provide minimizing steel containing niobium transverse corner crack stricture of vagina method, using leptoprosopy for double tapered chamfer crystallizer.
As shown in figure 1, chamber crystallizer narrow-surface copper includes work surface, referring also to Fig. 2 and Fig. 3, work surface is concave curved surface,
Work surface includes Part I 11 and Part II 12.Wherein, Part I 11 is apart from crystallizer 200mm suitable for reading on work surface
Part in the range of～400mm, Part II 12 be work surface on outside the scope of crystallizer 200mm～400mm suitable for reading
Part.Part I 11 includes first surface region 112, two fillet surface regions 113 of 111, two the second curved surface areas.
Referring to Fig. 1, first surface region 111 is second-degree parabola region.In embodiments of the present invention, first surface region
111 second-degree parabola equation is y=ax2+ b, described x are length of mould, and a is 5.5 × e-6～3.5 × e-5, b is to comprise to receive
Shrinkage strand size.
Referring to Fig. 1 and Fig. 3, two the second curved surface areas 112 are the curved surface that crown height suitable for reading is 1mm～3mm.Wherein, suitable for reading
Crown height is specially the ultimate range between line and this camber line between two end points on a camber line.
Referring to Fig. 1 and Fig. 2, two fillet surface regions 113 are the curved surface of 5mm～35mm for radius, two fillet surfaces
Region 113 connects the opposite sides in first surface region 111 and two the second curved surface areas 112 respectively.
Referring to Fig. 1～Fig. 3, Part II 12 and 111, two the second curved surface areas 112 in first surface region and two mistakes
Cross curved surface area 113 to connect, Part II 112 is the linear conical surface.
Cooling water channel 20 for cooling work face, cooling water channel 20 and are further opened with chamber crystallizer narrow-surface copper
On two curved surface areas 112, the distance at the edge away from fillet surface region 113 is 20mm～40mm, with fillet surface region 113
Distance be 10mm～30mm.
Embodiments provide a kind of method reducing the transverse corner crack stricture of vagina of steel containing niobium, including：
Step 10, using leptoprosopy be double tapered chamfer crystallizer manufacture steel containing niobium.
Specifically, crystallizer mould taper control suitable for reading, in 1.36～1.80% (as 1.36%, 1.50% or 1.80%), crystallizes
Under device, mouth mould taper control is in 0.85～1.3% (as 0.85%, 1.0% or 1.3%), the range of taper distance knot suitable for reading of crystallizer
200～the 400mm suitable for reading (as 200mm, 300mm or 400mm) of brilliant device.Metal is met in crystallization using above three parameter area
Solidification law in device, is conducive to the control of cc billet surface quality.
Step 20, control molten steel N content are less than or equal to 50ppm, and Nb content (weight content) is less than or equal to 0.12%.
Molten steel N content is more than 50ppm, and when Nb is more than 0.12%, strand precipitated phase is more, is unfavorable for slab surface crack control.
Water flow velocity in step 30, control crystallizer width face tank is more than the water flow velocity in leptoprosopy tank, wherein, crystallizer
Water flow velocity in the tank of wide face is 7.5～9.5m/s (as 7.5m/s, 8.5m/s or 9.5m/s), the water in crystallizer leptoprosopy tank
Flow velocity is 7.3～9.0m/s (as 7.3m/s, 8.1m/s or 9.0m/s).Control the water flow velocity in the tank of crystallizer width face and crystallization
Water flow velocity in device leptoprosopy tank, is conducive to strand in crystallizer uniformly to cool down.
Step 40, using two cold-zones cooling strands, two cold-zones are made up of 10 subregions, respectively 1 area, 2nd area, 3 areas ...
10th area, control two cold-zone specific waters are 0.55～0.80L/kg (as 0.55L/kg, 0.65L/kg or 0.80L/kg)；Control 2-4
The total Water of area's cooling water is 0.6～1.0 (as 0.6,0.8 or 1.0) with the ratio of the total Water of 6-8 area cooling water, using upper
State state modulator to be conducive to controlling casting blank bending, aligning area temperature, be conducive to avoiding steel grade brittle zone.
Step 50, the inflow temperature of control crystallizer are 28～32 DEG C (as 28 DEG C, 30 DEG C or 32 DEG C)；Control crystallizer
The degree of superheat is narrow degree of superheat scope, specifically, controls degree of superheat during cast molten steel to be 20～30 DEG C (such as 20 DEG C, 25 DEG C or 30
℃).The protection slag melting point in crystallizer is controlled to be less than or equal to 1150 DEG C；The molten steel viscosity in crystallizer is controlled to be less than or equal to
0.140pa s (viscosity of molten steel is the viscosity number at 1300 DEG C).The inflow temperature of crystallizer is 28～32 DEG C, controls crystallization
The degree of superheat of device is narrow degree of superheat scope, is conducive to controlling the generation of center segregation of casting blank and face crack.
Fluctuating temperature scope in step 60, control crystallizer is 0～6 DEG C (as 0,3 DEG C or 6 DEG C).Control in crystallizer
Fluctuating temperature scope be 0～6 DEG C, be conducive to Billet stable and uniform, uniformly cool down beneficial to green shell in crystallizer.
Step 70, the water yield of distribution in crystallizer leptoprosopy fillet surface is controlled to account for the 30%～50% of leptoprosopy total Water (such as
30%th, 40% or 50%).
Step 80, the pulling rate of control strand are less than or equal to 1.4m/min.The pulling rate controlling strand is less than or equal to 1.4m/
Min, uniformly cooling and center segregation of casting blank control to be conducive to casting billet surface.
It should be noted that above-mentioned steps 10～step 80 does not have dividing of priority, in actual applications should be in conjunction with actual work
Condition flexibly adopts.The method of minimizing steel containing the niobium transverse corner crack stricture of vagina present invention being provided with reference to specific embodiment is said
Bright：
Embodiment 1
Certain steel mill uses the method reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention to pour into a mould 230 × 1600mm
Middle carbon continuous casting billet containing niobium.
In process of production, the C content in molten steel is controlled to 0.018%, Nb content and is controlled to 0.03%.Crystallizer leptoprosopy
It is the double tapered crystallizer apart from 350mm suitable for reading, 1.46%, under crystallizer, mouth mould taper control exists crystallizer mould taper control suitable for reading
1.0%.Flow velocity in crystallizer width face and leptoprosopy tank is controlled as 8.7m/s and 8.4m/s.Two cold-zone specific waters are controlled to
0.73L/kg, the wherein total Water of 2-4 area cooling water are 0.6 with the ratio of the total Water of 6-8 area cooling water.Crystallizer protecting residue
Fusing point is controlled to 1050 DEG C, and viscosity is less than or equal to 0.132 (s1300 DEG C of pa).
Middle carbon niobium-containing steel strand using the method cast reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention
Do not check slab surface crack, the coiled sheet being rolled does not find the generation of edge fine rule.
Embodiment 2
Certain steel mill uses the method reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention to pour into a mould 230 × 1600mm
Middle carbon continuous casting billet containing niobium.
In process of production, the C content in molten steel is controlled to 0.085%, Nb content and is controlled to 0.06%, crystallizer leptoprosopy
It is the double tapered crystallizer apart from 350mm suitable for reading, 1.56%, under crystallizer, mouth mould taper control exists crystallizer mould taper control suitable for reading
1.1%.Flow velocity in crystallizer width face and leptoprosopy tank is controlled as 8.7m/s and 7.8m/s.Two cold-zone specific waters are controlled to
0.68L/kg, the wherein total Water of 2-4 area cooling water are 0.65 with the ratio of the total Water of 6-8 area cooling water.Crystallizer is protected
Slag melting point is controlled to 1070 DEG C, and viscosity is less than or equal to 0.138 (s1300 DEG C of pa).
The strand of steel containing niobium using the method cast reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention is not examined
Find slab surface crack, the coiled sheet being rolled does not find the generation of edge fine rule.
Embodiment 3
Certain steel mill uses the method reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention to pour into a mould 230 × 1400mm
Steel continuous casting billet containing niobium.
In process of production, the C content in molten steel is controlled to 0.07%, Nb content and is controlled to 0.05%, crystallizer leptoprosopy
It is the double tapered crystallizer apart from 350mm suitable for reading, crystallizer mould taper control suitable for reading is 1.56%, and under crystallizer, mouth mould taper control exists
1.1%.Flow velocity in crystallizer width face and leptoprosopy tank is controlled as 8.7m/s and 8.4m/s scope.Two cold-zone specific water controls
It is made as 0.70L/kg, wherein 2-4 area cooling water. total Water is 0.7 with the ratio of the total Water of 6-8 area cooling water；Crystallizer
Protection slag melting point is controlled to 1100 DEG C, and viscosity is less than or equal to 0.135 (s1300 DEG C of pa).
The strand of steel containing niobium using the method cast reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention is not examined
Find slab surface crack, the coiled sheet being rolled does not find the generation of edge fine rule.
The method reducing the transverse corner crack stricture of vagina of steel containing niobium provided in an embodiment of the present invention, by being double tapered chamfering using leptoprosopy
Crystallizer, in conjunction with the state modulator such as conical degree of crystallizer and crystallizer discharge, can be good at solve Nb content be less than or wait
Easily produce the problem of transverse crack in 0.12% strand corner.The method of minimizing steel containing the niobium transverse corner crack stricture of vagina that the present invention provides,
The heat transfer of strand corner can be improved, decrease corner stress, strengthen the solidification uniformity of green shell at fillet surface, simultaneously the method for
The steel grade that Nb content is less than or equal to 0.12% is all suitable for, and is effectively controlled strand corner defect and occurs.
It should be noted last that, above specific embodiment only in order to technical scheme to be described and unrestricted,
Although being described in detail to the present invention with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should be covered
In the middle of scope of the presently claimed invention.
Claims (5)
1. a kind of method reducing the transverse corner crack stricture of vagina of steel containing niobium is it is characterised in that include：
Using leptoprosopy for double tapered chamfer crystallizer manufacture steel containing niobium；The mould taper control suitable for reading of described crystallizer 1.36～
1.80%, the lower mouth mould taper control of described crystallizer is 0.85～1.3%；
The N content controlling molten steel is less than or equal to 50ppm, and controls the Nb content of described molten steel to be less than or equal to 0.12%；
The water flow velocity in the wide face tank of described crystallizer is controlled to be more than the water flow velocity in the leptoprosopy tank of described crystallizer；Using
Two cold-zone cooling strands, control two cold-zone specific waters are 0.55～0.80L/kg；Described two cold-zones are made up of 10 subregions, respectively
For 1st area, 2nd area, 3rd area, 4th area, 5th area, 6th area, 7th area, 8th area, 9th area and 10th area, wherein 1～8 area is sufficient roller, vertical section, bending section, rectify
Straight section region cooling water, 9th area, 10th area are horizontal segment region；Control the total Water of 2～4 area's cooling waters and 6～8 area's cooling waters
The ratio of total Water is 0.6～1.0；
The inflow temperature controlling described crystallizer is 28～32 DEG C；Control degree of superheat during cast molten steel to be 20～30 DEG C, control
Protection slag melting point in described crystallizer is less than or equal to 1150 DEG C；The molten steel viscosity in described crystallizer is controlled to be less than or equal to
0.140pa s, the viscosity of described molten steel is the viscosity number at 1300 DEG C.
2. the method reducing the transverse corner crack stricture of vagina of steel containing niobium according to claim 1 is it is characterised in that the width of described crystallizer
Water flow velocity in the tank of face is 7.5～9.5m/s, and the water flow velocity in the leptoprosopy tank of described crystallizer is 7.3～9.0m/s.
3. the method reducing the transverse corner crack stricture of vagina of steel containing niobium according to claim 2 is it is characterised in that also include：Control institute
The fluctuating temperature scope stated in crystallizer is 0～6 DEG C.
4. the method reducing the transverse corner crack stricture of vagina of steel containing niobium according to claim 2 is it is characterised in that also include：Control institute
The water yield stating distribution in the leptoprosopy fillet surface of crystallizer accounts for the 30%～50% of leptoprosopy total Water.
5. the method reducing the transverse corner crack stricture of vagina of steel containing niobium according to claim 1 is it is characterised in that also include：Control casting
The pulling rate of base is less than or equal to 1.4m/min.
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| CN112893793A (en) * | 2021-01-19 | 2021-06-04 | 南京钢铁股份有限公司 | Method for controlling corner cracks of wide and thick plate arc-shaped continuous casting billet |
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| CN105414512A (en) * | 2015-11-26 | 2016-03-23 | 首钢京唐钢铁联合有限责任公司 | Control method for transverse corner cracks of casting blank of chamfering crystallizer |
| CN105344960A (en) * | 2015-11-26 | 2016-02-24 | 首钢京唐钢铁联合有限责任公司 | Method for improving casting blank pulling speed of chamfering crystallizer |
| CN107414049B (en) * | 2016-05-23 | 2020-01-21 | 上海梅山钢铁股份有限公司 | Refining control method for metallographic structure of surface layer of corner of continuous casting slab |
| CN108907131B (en) * | 2018-07-10 | 2020-07-03 | 邯郸钢铁集团有限责任公司 | Secondary cooling control method for reducing surface cracks of head and tail blanks of slab continuous casting |
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| JP3149763B2 (en) * | 1995-12-15 | 2001-03-26 | 日本鋼管株式会社 | Prevention method of placing cracks in continuous cast slabs of bearing steel |
| JP2000246408A (en) * | 1999-02-26 | 2000-09-12 | Daido Steel Co Ltd | Manufacture of high sulfur steel material |
| CN201677013U (en) * | 2010-05-19 | 2010-12-22 | 首钢总公司 | Continuous slab casting mold |
| CN202052915U (en) * | 2011-03-30 | 2011-11-30 | 钢铁研究总院 | Narrow-surface copper plate of chamfer crystallizer for thin slab continuous casting |
| CN102409221B (en) * | 2011-12-02 | 2012-12-19 | 武汉钢铁(集团)公司 | Method for controlling edge cracks of peritectic steel containing niobium or boron |
| CN102744383A (en) * | 2012-07-30 | 2012-10-24 | 首钢总公司 | Nb-contained hypo-peritectic steel continuous casting and manufacture method and dedicated continuous casting machine thereof |
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| CN112893793A (en) * | 2021-01-19 | 2021-06-04 | 南京钢铁股份有限公司 | Method for controlling corner cracks of wide and thick plate arc-shaped continuous casting billet |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |