CN109014095A - Method for reducing casting blank bubble defects of Cr-containing steel type of plate blank - Google Patents
Method for reducing casting blank bubble defects of Cr-containing steel type of plate blank Download PDFInfo
- Publication number
- CN109014095A CN109014095A CN201710439367.7A CN201710439367A CN109014095A CN 109014095 A CN109014095 A CN 109014095A CN 201710439367 A CN201710439367 A CN 201710439367A CN 109014095 A CN109014095 A CN 109014095A
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- CN
- China
- Prior art keywords
- slab
- hole
- steel
- tundish
- less
- Prior art date
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- Granted
Links
- 230000007547 defect Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005266 casting Methods 0.000 title claims abstract description 7
- 239000002436 steel type Substances 0.000 title 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 33
- 239000010959 steel Substances 0.000 claims abstract description 33
- 229910052786 argon Inorganic materials 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 238000009749 continuous casting Methods 0.000 claims abstract description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- 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
- B22D11/117—Refining the metal by treating with gases
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
the invention relates to a method for reducing bubble defects of a casting blank of a Cr-containing steel plate blank, wherein argon of a tundish is operated at a low flow rate, the argon flow of a stopper of the tundish is less than or equal to 2.0N L/min, the argon flow of a water feeding port is less than or equal to 2.0N L/min, the minimum steel flow rate of a single flow in the casting process is not lower than 2.4 tons/min, when the width of the plate blank is less than or equal to 1500mm, a three-hole submerged nozzle is used for continuous casting, the inclination angle of two side holes is 15 degrees, the steel passing area of a vertical hole accounts for 5-18 percent of the total steel passing area, when the width of the plate blank is more than 1500mm, a two-hole submerged nozzle without a vertical hole is used for continuous casting, the inclination angle of the water ports of the two side holes is 20 degrees, the superheat degree of molten steel of the tundish is not less than 12 ℃, the distance from the upper edge of a discharging hole of the submerged nozzle to the liquid level of molten steel of a crystallizer is 100-160 mm.
Description
Technical field
The present invention relates to metallurgical technology field, in particular to a kind of side for reducing slab Li-adding Al alloy kind slab air blister defect
Method.
Background technique
Four subsidiary factory of Steelmaking In Anshan Iron And Steel Company head factory production slab is relatively high containing Cr (Cr >=0.15%) steel grade ratio, since slab contains Cr
Molten steel molten steel viscosity is larger, and the Argon Bubble that crystallizer is blown into production process is easy to be captured by green shell, in the slab operation of rolling
Bubble exposure rolling, which is elongated, forms edge " sticking up skin " shape defect, and the specification of rolling is thinner, and defect is more obvious.Due to slab Li-adding Al alloy
Kind yield is higher, and the frequency for edge air blister defect occur is very high, and mostly exported product, and quality requirement is more stringent, anxious
It needs to solve.
Summary of the invention
Technical problem to be solved by the invention is to provide it is a kind of reduce slab Li-adding Al alloy kind slab air blister defect method,
It solves to contain the steel grade of Cr >=0.15% slab and hot rolling material defect problem.
To achieve the above object, the present invention is implemented with the following technical solutions:
A method of slab Li-adding Al alloy kind slab air blister defect being reduced, specific steps include:
1) tundish argon gas is operated using small flow, stopper rod of tundish argon flow≤2.0NL/min, filling pipe end argon gas stream
Amount≤2.0NL/min；
2) minimum steel -passing amount is singly flowed in casting process not less than 2.4 tons/min；
3) as width of plate slab≤1500mm, continuous casting uses three hole submersed nozzles；When 1500mm < width of plate slab≤
2200mm, continuous casting use the two hole submersed nozzles without vertical hole；
4) the Metal in Tundish degree of superheat is not less than 12 DEG C；
It 5) is 100-160mm along crystallizer liquid steel level distance is arrived on submersed nozzle discharge hole.
The three hole submersed nozzles, 15 ° of two side holes nozzle angles, the logical steel area of vertical hole accounts for always logical steel area ratio and is
5-18%.
The two hole submersed nozzles, 20 ° of two side holes nozzle angles.
Cr >=0.15% in the Li-adding Al alloy kind slab.
Compared with prior art, the beneficial effects of the present invention are:
The present invention avoids generating air blister defect containing the steel grade of Cr >=0.15%, eliminates bubble exposure rolling in the slab operation of rolling
Elongation forms edge " sticking up skin " shape defect.Improve the product quality of such steel grade.
Detailed description of the invention
Fig. 1 is three hole submersed nozzle schematic diagrames.
Fig. 2 is two hole submersed nozzle schematic diagrames.
In figure: side opening 1, vertical hole 2.
Specific embodiment
A specific embodiment of the invention is further illustrated below:
A method of reducing slab Li-adding Al alloy kind slab air blister defect, the specific steps are as follows:
1) tundish argon gas is operated using small flow, stopper rod of tundish argon flow≤2.0NL/min, filling pipe end argon gas stream
Amount≤2.0NL/min；
2) minimum steel -passing amount is singly flowed in casting process not less than 2.4 tons/min；
3) as width of plate slab≤1500mm, using three hole submersed nozzles, 15 ° of two side holes nozzle angles, vertical hole leads to steel
It is 5-18% that area, which accounts for always logical steel area ratio, (see attached drawing 1)；As 1500mm < width of plate slab≤2200mm, two hole immersions are used
The mouth of a river, no vertical hole, 20 ° of two side holes water nozzle angles (see attached drawing 2)；
4) the tundish degree of superheat is not less than 12 DEG C；
It 5) is 100-160mm along crystallizer liquid steel level distance is arrived on submersed nozzle discharge hole.
Embodiment 1 produces the method for controlling operation thereof of slab SS400Cr (width=1280mm):
1) tundish argon gas is operated using small flow, and stopper rod of tundish argon flow is controlled in 1.2NL/min, filling pipe end argon
Throughput is controlled in 1.0NL/min.
2) section 170*1280mm, pulling rate 1.9m/min, it is single to flow steel -passing amount control in 3.24 tons/min.
3) three hole submersed nozzles are used, 15 ° of two side holes nozzle angles, the logical steel area of vertical hole accounts for always logical steel area ratio and is
10% (see attached drawing 1).
4) baotou steel water superheat is not less than 18 DEG C, 23 DEG C of target superheat degree in.
It 5) is 120-140mm along crystallizer liquid steel level distance is arrived on submersed nozzle discharge hole.
Embodiment 2 produces the method for controlling operation thereof of slab A36-Cr (width=1700mm):
1) tundish argon gas is operated using small flow, and stopper rod of tundish argon flow is controlled in 1.5NL/min, filling pipe end argon
Throughput is controlled in 1.2NL/min.
2) section 170*1700mm, pulling rate 1.5m/min, it is single to flow steel -passing amount control in 3.40 tons/min.
3) two hole submersed nozzles, no vertical hole, 20 ° of two side holes water nozzle angles are used (see attached drawing 2).
4) baotou steel water superheat is not less than 20 DEG C, 25 DEG C of target superheat degree in.
It 5) is 130-150mm along crystallizer liquid steel level distance is arrived on submersed nozzle discharge hole.
Described above is only basic principle of the invention, is not intended to limit the invention in any way, all right according to the present invention
It carries out equivalent variations and modification, within the scope of the art of this patent protection scheme.
Claims (4)
1. a kind of method for reducing slab Li-adding Al alloy kind slab air blister defect, which is characterized in that specific steps include:
1) tundish argon gas is operated using small flow, stopper rod of tundish argon flow≤2.0NL/min, and filling pipe end argon flow≤
2.0NL/min；
2) minimum steel -passing amount is singly flowed in casting process not less than 2.4 tons/min；
3) as width of plate slab≤1500mm, continuous casting uses three hole submersed nozzles；As 1500mm < width of plate slab≤2200mm, even
Casting uses the two hole submersed nozzles without vertical hole；
4) the Metal in Tundish degree of superheat is not less than 12 DEG C；
It 5) is 100-160mm along crystallizer liquid steel level distance is arrived on submersed nozzle discharge hole.
2. a kind of method for reducing slab Li-adding Al alloy kind slab air blister defect according to claim 1, which is characterized in that institute
The three hole submersed nozzles stated, 15 ° of two side holes nozzle angles, it is 5-18% that vertical hole, which leads to steel area to account for always logical steel area ratio,.
3. a kind of method for reducing slab Li-adding Al alloy kind slab air blister defect according to claim 1, which is characterized in that institute
The two hole submersed nozzles stated, 20 ° of two side holes nozzle angles.
4. a kind of method for reducing slab Li-adding Al alloy kind slab air blister defect according to claim 1, which is characterized in that institute
State Cr >=0.15% in Li-adding Al alloy kind slab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439367.7A CN109014095B (en) | 2017-06-12 | 2017-06-12 | Method for reducing casting blank bubble defects of Cr-containing steel type of plate blank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439367.7A CN109014095B (en) | 2017-06-12 | 2017-06-12 | Method for reducing casting blank bubble defects of Cr-containing steel type of plate blank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109014095A true CN109014095A (en) | 2018-12-18 |
| CN109014095B CN109014095B (en) | 2020-07-17 |
Family
ID=64629251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710439367.7A Active CN109014095B (en) | 2017-06-12 | 2017-06-12 | Method for reducing casting blank bubble defects of Cr-containing steel type of plate blank |
Country Status (1)
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| CN (1) | CN109014095B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112643007A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Continuous casting method for reducing large-size inclusions on surface layer of aluminum-containing steel casting blank |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617172A (en) * | 1979-07-23 | 1981-02-18 | Nippon Steel Corp | Production of good quality steel material by continuous casting |
| JPH02274349A (en) * | 1989-04-13 | 1990-11-08 | Nippon Steel Corp | Continuous casting method |
| CN101244451A (en) * | 2008-03-19 | 2008-08-20 | 大连理工大学 | Method and apparatus for improving horizontal continuous casting billet quality by applying composite field |
| CN102717045A (en) * | 2012-06-27 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Double-phase stainless steel continuous casting method |
| CN105603145A (en) * | 2016-01-07 | 2016-05-25 | 唐山钢铁集团有限责任公司 | Method for rectangular continuous casting production of low-carbon low-silicon steel |
-
2017
- 2017-06-12 CN CN201710439367.7A patent/CN109014095B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617172A (en) * | 1979-07-23 | 1981-02-18 | Nippon Steel Corp | Production of good quality steel material by continuous casting |
| JPH02274349A (en) * | 1989-04-13 | 1990-11-08 | Nippon Steel Corp | Continuous casting method |
| CN101244451A (en) * | 2008-03-19 | 2008-08-20 | 大连理工大学 | Method and apparatus for improving horizontal continuous casting billet quality by applying composite field |
| CN102717045A (en) * | 2012-06-27 | 2012-10-10 | 山西太钢不锈钢股份有限公司 | Double-phase stainless steel continuous casting method |
| CN105603145A (en) * | 2016-01-07 | 2016-05-25 | 唐山钢铁集团有限责任公司 | Method for rectangular continuous casting production of low-carbon low-silicon steel |
Non-Patent Citations (3)
| Title |
|---|
| 安连旗等: "2150ASP中碳钢气泡缺陷控制", 《2012年全国炼钢-连铸生产技术会论文集（上）》 * |
| 简龙等: "连铸坯气泡缺陷的形成机理及其控制措施", 《第四届发展中国家连铸国际会议论文集》 * |
| 马春生等: "《低成本生产洁净钢的实践》", 29 February 2016, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112643007A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Continuous casting method for reducing large-size inclusions on surface layer of aluminum-containing steel casting blank |
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| Publication number | Publication date |
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| CN109014095B (en) | 2020-07-17 |
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