CN109014095B - 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
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- CN109014095B CN109014095B CN201710439367.7A CN201710439367A CN109014095B CN 109014095 B CN109014095 B CN 109014095B CN 201710439367 A CN201710439367 A CN 201710439367A CN 109014095 B CN109014095 B CN 109014095B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
- B22D11/117—Refining the metal by treating with gases
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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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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 highest 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 passing ports of the two side holes is 20 degrees, the superheat degree of molten steel of the tundish is not less than 12 ℃, and the distance from the upper edge of a spitting hole of the submerged nozzle to the liquid level of molten steel of a crystallizer is 160 mm.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for reducing casting blank bubble defects of Cr-containing steel of a plate blank.
Background
The proportion of Cr-containing steel grade of the plate blank produced by the fourth branch of the saddle steel-making main plant is higher (Cr is more than or equal to 0.15%), because the molten steel viscosity of the Cr-containing molten steel of the plate blank is higher, argon bubbles blown into a crystallizer in the production process are easily captured by a blank shell, the bubbles are exposed, rolled and elongated in the casting blank rolling process to form an edge part warping skin-shaped defect, and the defect is more obvious when the rolling specification is thinner. Because the slab Cr-containing steel has high yield, the frequency of edge bubble defects is very high, and most of the Cr-containing steel is exported, the quality requirement is more strict, and the problem is urgently solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for reducing the bubble defect of a Cr-containing steel type casting blank of a plate blank, and solving the defect problems of the Cr-containing steel type casting blank and a hot rolled material, wherein the Cr content of the Cr-containing steel type casting blank is more than or equal to 0.15%.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for reducing slab Cr-containing steel casting blank bubble defects comprises the following specific steps:
1) the argon of the tundish is operated at a small flow, the argon flow of the stopper of the tundish is less than or equal to 2.0N L/min, and the argon flow of the water feeding port is less than or equal to 2.0N L/min;
2) the minimum steel passing amount of the single flow in the casting process is not lower than 2.4 tons/min;
3) when the width of the slab is less than or equal to 1500mm, a three-hole submerged nozzle is used for continuous casting; when the width of the plate blank is more than 1500mm and less than or equal to 2200mm, a two-hole submerged nozzle without a vertical hole is used for continuous casting;
4) the superheat degree of the molten steel of the tundish is not less than 12 ℃;
5) the distance from the upper edge of the discharge hole of the submerged nozzle to the liquid level of molten steel in the crystallizer is 100-160 mm.
The dip angle of the three-hole submerged nozzles at the two side hole nozzles is 15 degrees, and the steel passing area of the vertical hole accounts for 5-18 percent of the total steel passing area.
The dip angle of the two-hole submerged nozzles is 20 degrees.
The Cr content in the Cr-containing steel casting blank is more than or equal to 0.15 percent.
Compared with the prior art, the invention has the beneficial effects that:
the invention avoids the defect that the steel containing more than or equal to 0.15 percent of Cr generates bubbles, and eliminates the defect that the bubbles are exposed, rolled and elongated to form edge parts with tilted skins in the casting blank rolling process. The product quality of the steel grade is improved.
Drawings
FIG. 1 is a schematic view of a three-hole submerged entry nozzle.
FIG. 2 is a schematic view of a two-hole submerged entry nozzle.
In the figure: side hole 1, vertical hole 2.
Detailed Description
The following further illustrates embodiments of the invention:
a method for reducing slab Cr-containing steel casting blank bubble defects comprises the following specific steps:
1) the argon of the tundish is operated at a small flow, the argon flow of the stopper of the tundish is less than or equal to 2.0N L/min, and the argon flow of the water feeding port is less than or equal to 2.0N L/min;
2) the minimum steel passing amount of the single flow in the casting process is not lower than 2.4 tons/min;
3) when the width of the slab is less than or equal to 1500mm, three-hole submerged nozzles are used, the inclination angle of the two-side hole nozzles is 15 degrees, and the ratio of the steel passing area of the vertical holes to the total steel passing area is 5-18% (see figure 1); when the width of the plate blank is more than 1500mm and less than or equal to 2200mm, a two-hole submerged nozzle is used, a vertical hole is not formed, and the inclination angle of the water nozzle with holes at two sides is 20 degrees (see the attached figure 2);
4) the superheat degree of the tundish is not less than 12 ℃;
5) the distance from the upper edge of the discharge hole of the submerged nozzle to the liquid level of molten steel in the crystallizer is 100-160 mm.
Example 1 operating control method for producing a slab SS400Cr (width 1280 mm):
1) the argon of the tundish is operated at a small flow, the flow of the argon of the stopper of the tundish is controlled at 1.2N L/min, and the flow of the argon of the water feeding port is controlled at 1.0N L/min.
2) The section is 170 mm 1280mm, the pulling speed is 1.9m/min, and the single-flow steel quantity is controlled at 3.24 tons/min.
3) Three-hole submerged nozzles are used, the inclination angle of the nozzles at two sides is 15 degrees, and the ratio of the vertical hole through steel area to the total through steel area is 10 percent (see figure 1).
4) The superheat degree of the tundish molten steel is not less than 18 ℃, and the target superheat degree is 23 ℃.
5) The distance from the upper edge of the discharge hole of the submerged nozzle to the liquid level of molten steel in the crystallizer is 120-140 mm.
Example 2 operating control method for producing slab a36-Cr (width 1700 mm):
1) the argon of the tundish is operated at a small flow, the flow of the argon of the stopper of the tundish is controlled at 1.5N L/min, and the flow of the argon of the water feeding port is controlled at 1.2N L/min.
2) The section is 170 mm 1700mm, the pulling speed is 1.5m/min, and the single flow steel quantity is controlled at 3.40 tons/min.
3) A two-hole submerged nozzle without vertical holes was used, with a 20 ° inclination for the two-hole nozzle (see fig. 2).
4) The superheat degree of the tundish molten steel is not less than 20 ℃, and the target superheat degree is 25 ℃.
5) The distance from the upper edge of the discharge hole of the submerged nozzle to the liquid level of molten steel in the crystallizer is 130-150 mm.
The foregoing is considered as illustrative only of the principles of the invention and is not to be in any way limiting, since all equivalent changes and modifications are intended to be included within the scope of the appended claims.
Claims (1)
1. A method for reducing slab Cr-containing steel casting blank bubble defects is characterized by comprising the following steps of:
1) the argon of the tundish is operated at a small flow, the argon flow of the stopper of the tundish is less than or equal to 2.0N L/min, and the argon flow of the water feeding port is less than or equal to 2.0N L/min;
2) the minimum steel passing amount of the single flow in the casting process is not lower than 2.4 tons/min;
3) when the width of the slab is less than or equal to 1500mm, a three-hole submerged nozzle is used for continuous casting; three-hole immersion type water gaps, wherein the inclination angle of the water gaps of the two side holes is 15 degrees, and the ratio of the steel passing area of the vertical hole to the total steel passing area is 5-18 percent;
when the width of the plate blank is more than 1500mm and less than or equal to 2200mm, a two-hole submerged nozzle without a vertical hole is used for continuous casting; the dip angle of the two-hole submerged nozzles is 20 degrees;
4) the superheat degree of the molten steel of the tundish is not less than 12 ℃;
5) the distance from the upper edge of the discharge hole of the submerged nozzle to the liquid level of molten steel in the crystallizer is 100-160 mm.
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| 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| Publication Number | Publication Date |
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| CN109014095A CN109014095A (en) | 2018-12-18 |
| CN109014095B true CN109014095B (en) | 2020-07-17 |
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| 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 |
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| CN112643007B (en) * | 2020-11-23 | 2022-05-20 | 首钢集团有限公司 | Continuous casting method for reducing large-size impurities 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 (2)
| Title |
|---|
| 2150ASP中碳钢气泡缺陷控制;安连旗等;《2012年全国炼钢-连铸生产技术会论文集（上）》;20120717;第392-396页 * |
| 连铸坯气泡缺陷的形成机理及其控制措施;简龙等;《第四届发展中国家连铸国际会议论文集》;20081130;第216-219页 * |
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| CN109014095A (en) | 2018-12-18 |
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