CN102717045A - Double-phase stainless steel continuous casting method - Google Patents
Double-phase stainless steel continuous casting method Download PDFInfo
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- CN102717045A CN102717045A CN2012102134976A CN201210213497A CN102717045A CN 102717045 A CN102717045 A CN 102717045A CN 2012102134976 A CN2012102134976 A CN 2012102134976A CN 201210213497 A CN201210213497 A CN 201210213497A CN 102717045 A CN102717045 A CN 102717045A
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 23
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 17
- 239000010935 stainless steel Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 23
- 239000010959 steel Substances 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000007670 refining Methods 0.000 claims abstract description 11
- 238000007664 blowing Methods 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 238000003780 insertion Methods 0.000 claims abstract description 4
- 230000037431 insertion Effects 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 9
- 238000013019 agitation Methods 0.000 claims description 5
- 230000007547 defect Effects 0.000 abstract description 7
- 239000002893 slag Substances 0.000 abstract description 2
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 6
- 230000002950 deficient Effects 0.000 description 4
- 238000004512 die casting Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a double-phase stainless steel continuous casting method, which sequentially comprises the following steps that 1, through the temperature regulation and the fine adjustment through an LF (low frequency) refining furnace, the mass percentage of ingredients of molten steel reaches the following values that C is less or equal to 0.03 percent, Si is less than or equal to 1.00 percent, Mn is less than or equal to 6.00 percent, P is less than or equal to 0.040 percent, S is less than or equal to 0.030 percent, Cr is 21.00 to 26.00 percent, Ni is 1.35 to 8.00 percent, Mo is 0.10 to 5.00 percent, Cu is less than or equal to 0.80 percent, N is 0.100 to 0.320 percent, and the rest materials are Fe and unavoidable impurities, bottom blowing of Ar is carried out, the weak stirring is carried out for 10 to 15minutes, and the still standing is carried out for 18 to 25 minutes after the refining completion; 2, large ladles of molten steel are cast into middle ladles, the overheat degree is 20 to 45 DEG C, the insertion depth of a soaking water opening is 100 to 145mm, the pulling speed is 0.75 to 1.15 minutes, the specific water quantity is 0.30 to 0.32 L/Kg, crystallizer protection slag is added, the alkalinity is 0.85 to 0.95 percent, the melting point is 1090 to 1110 DEG C, and the viscosity is 1.5 to 1.7dpa.s; and 3, continuous blanks with the cross sections being 325 to 710 cm<2> are formed through continuous casting, and the crystallizer electromagnetic stirring is adopted. The double-phase stainless steel continuous casting method has the advantage that the defects of under-surface bubbles, surface cracks and shrinkage holes of the continuous casting blanks are overcome.
Description
Technical field
The present invention relates to a kind of method of two phase stainless steel continuous casting.
Background technology
Two phase stainless steel has the advantage of austenitic stainless steel and ferritic stainless steel concurrently, and intensity is high, corrosion resistance and good; The existence of 23% Cr and an amount of N content, two phase stainless steel has more the good good characteristics of anti-spot corrosion, crevice corrosion and weldability, and is widely used in each field such as oil, chemical industry, papermaking and bridge.
During the two phase stainless steel continuous casting; Be prone to produce rimhole, face crack, center porosity and shrinkage cavity defect; If with the rolling pipe blank of above-mentioned defective two phase stainless steel blank is arranged, not only blank surface palpus reconditioning, and also defectives such as crackle, pipe can appear in inside pipe wall when poling.Therefore produce diameter with two phase stainless steel and adopt die casting usually,, can improve the steel ingot internal soundness, satisfy pipe and produce needs through improving compression ratio though die casting also produces such as center porosity and shrinkage cavity defect greater than 100mm pipe blank.
One Chinese patent application number 200910050544.8 open " a kind of production methods that supply pipe Gao Ge to contain N two phase stainless steel continuous cast billet ", its square billet section≤160 * 160mm
2, belong to little square billet, and casting blank section is greater than 325cm
2Square billet or the continuous casting production of also being unrealized of circle base.
Summary of the invention
For overcoming the defective of rimhole, face crack, center porosity and shrinkage cavity that existing two phase stainless steel produces when the continuous casting, the present invention provides a kind of method of two phase stainless steel continuous casting, and this method is produced casting blank section 325-710cm
2Square billet or circle base, and do not have the defective of rimhole, face crack, center porosity and shrinkage cavity, surface quality can realize not having reconditioning, compares with die casting, improves and rolls back lumber recovery 12%-15%.
Technical conceive of the present invention is:
The first, behind refining furnace temperature adjustment and fine setting composition, stir a little less than blowing Ar with the ladle bottom blowing device, make molten steel component and temperature even, extremely unwrap greatly afterwards and water to certain calm time of molten steel, field trash is fully floated;
The second, each parameters optimal combination and suitable immersion mouth of a river insertion depth of the degree of superheat, pulling rate, specific water and crystallizer electromagnetic agitation can solve strand rimhole, face crack, center porosity and shrinkage cavity defect;
Three, crystallization control device covering slag basicity, fusing point, three important indicators of viscosity also help to improve cc billet surface quality.
The method of this two phase stainless steel continuous casting comprises following sequential steps:
IBehind temperature adjustment of LF refining furnace and fine setting composition, the mass percent of the composition of molten steel reaches:
C≤0.03； Si≤1.00； Mn≤6.00； ?P≤0.040； ?S≤0.030；
Cr?21.00～26.00； Ni?1.35～8.00； ?Mo?0.10～5.00； ?Cu≤0.80；
N 0.100～0.320; All the other are Fe and unavoidable impurities.
Ladle bottom blowing Ar, intensity 1.5～2.5L/min.t, weak stirring 10～15min (temperature drop is by 0.5～1.5 ℃ of calculating); Refining finishes to water the calm time 18～25min of molten steel to unwrapping greatly.
IIThe molten steel that wraps is greatly watered tundish, 20～45 ℃ of the degrees of superheat; Immerse mouth of a river insertion depth 100～145mm; Pulling rate 0.75～1.15min; Specific water 0.30～0.32L/Kg; Add crystallizer protecting residue: basicity 0.85～0.95,1090～1110 ℃ of fusing points, viscosity (1300 ℃) 1.5～1.7dpa.s.
IIIContinuous casting becomes section 325-710cm
2Continuous casting billet, use the crystallizer electromagnetic agitation, current strength 500～700A, frequency 4～5Hz.
The present invention produces section 325～710cm
2Square billet or circle base do not have rimhole, face crack, center porosity and shrinkage cavity defect, and surface quality can realize not having reconditioning, compares with die casting, improve and roll back lumber recovery 12%-15%.
The specific embodiment
Specify the specific embodiment of the method for this two phase stainless steel continuous casting below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
Present embodiment carries out on diameter 300mm four stream round billet continuous casting machines, steel grade 022Cr22Ni5Mo3N, and 1460 ℃ of liquidus curves, finished product chemical composition mass percent:
C≤0.03； Si≤1.00； Mn≤2.00； P≤0.030； ?S≤0.020；
Cr?21.00～23.00； Ni?4.50～6.50； Mo?2.50～3.50；
Cu≤0.10; N 0.100～0.200; All the other are Fe and unavoidable impurities.
Present embodiment comprises following sequential steps:
IBehind temperature adjustment of LF refining furnace and fine setting composition, the mass percent of molten steel component:
C 0.013； ?Si 0.43； ?Mn 1.21； ?P 0.020； ?S 0.001；
Cr 22.31； Ni 5.38； ?Mo 3.23； ?N?0.159； Cu 0.01；
All the other are Fe and unavoidable impurities.
Molten steel weight 85t, 1545 ℃ of temperature are fed calcium line 220m, ladle bottom blowing Ar, intensity 2.35L/min.t, weak stirring 13min, 1535 ℃ of out-station temperatures, refining finishes to water the calm time 20min of molten steel to unwrapping greatly.
IIMolten steel in the bag is greatly watered to tundish, and the bag temperature is 1508 ℃ in surveying during the middle liquid 8t of Baogang; During the liquid 12t of Baogang four streams open successively and water, add crystallizer protecting residue: basicity 0.89,1100 ℃ of fusing points, viscosity (1300 ℃) 1.6dpa.s; Starting pulling rate 0.5m/min, pulling rate rises to 0.75min behind the 1min, specific water 0.301L/Kg; Covering agent 160Kg in adding during 15t; Immerse the mouth of a river and insert molten steel degree of depth 140mm;
IIIContinuous casting becomes the continuous casting billet of diameter 300mm; Strand goes out crystallizer 2m, opens crystallizer electromagnetic agitation (revolving-field type, current strength 600A, frequency 4.5Hz); The bag thermometric is 1498 ℃ among the 15min, pulling rate 0.80m/min, specific water 0.302L/Kg; The bag thermometric is 1495 ℃ among the 25min, pulling rate 0.85m/min, specific water 0.305L/Kg; The bag thermometric is 1493 ℃ among the 35min, pulling rate 0.90m/min, specific water 0.308L/Kg.
Big bag has watered, and when middle Baogang liquid level was reduced to 260mm, pulling rate was reduced to 0.5m/min, the operation of binding.
The round base of producing does not have rimhole, face crack, center porosity and shrinkage cavity defect, and surface quality can realize not having reconditioning.
Embodiment two
Present embodiment is at 220 * 220mm
2Carry out on the four stream billet casters, steel grade S32750,1450 ℃ of liquidus curves, finished product chemical composition mass percent:
C≤0.03；?Si≤0.80；Mn≤1.20；P≤0.035；S≤0.020；?Cr?24.00-26.00；
Ni?6.00-8.00；?Mo?3.00-5.00；?N?0.240-0.320； Cu≤0.30；
All the other are Fe and unavoidable impurities.
Present embodiment comprises following sequential steps:
IBehind temperature adjustment of LF refining furnace and fine setting composition, the mass percent of molten steel component:
C 0.015；?Si?0.45；?Mn?0.60；?P?0.015；?S?0.015； Cr?24.83；
Ni 7.27; Mo 4.08; N 0.290; Cu 0.01; All the other are Fe and unavoidable impurities.
Molten steel weight 83t, 1539 ℃ of temperature are fed calcium line 210m, ladle bottom blowing Ar, intensity 2.29L/min.t, weak stirring 10min, 1530 ℃ of out-station temperatures, refining finishes to water calm times 19 min of molten steel to unwrapping greatly;
IIMolten steel in the bag is greatly watered to tundish, and the bag temperature is 1497 ℃ in surveying during the middle liquid 8t of Baogang; During the liquid 12t of Baogang four streams open successively and water, add crystallizer protecting residue (basicity 0.89,1100 ℃ of fusing points, viscosity (1300 ℃) 1.6dpa.s); Starting pulling rate 0.5m/min, pulling rate rises to 0.85min behind the 1min, specific water 0.301L/Kg; Covering agent 160Kg in adding during 15t; Immerse the mouth of a river and insert molten steel degree of depth 130mm;
IIIContinuous casting becomes 220 * 220mm
2Continuous casting billet, strand goes out crystallizer 2m, opens crystallizer electromagnetic agitation (revolving-field type, current strength 550A, frequency 4.5Hz); The bag thermometric is 1481 ℃ among the 15min, pulling rate 0.90m/min, specific water 0.301L/Kg; The bag thermometric is 1490 ℃ among the 25min, pulling rate 0.95m/min, specific water 0.302L/Kg; The bag thermometric is 1482 ℃ among the 35min, pulling rate 1.05m/min, specific water 0.303L/Kg.
Big bag has watered, and when middle Baogang liquid level was reduced to 200mm, pulling rate was reduced to 0.5m/min, the operation of binding.
The round base of producing does not have rimhole, face crack, center porosity and shrinkage cavity defect, and surface quality can realize not having reconditioning.
Claims (1)
1. the method for a two phase stainless steel continuous casting, it comprises following sequential steps:
IBehind temperature adjustment of LF refining furnace and fine setting composition, the mass percent of the composition of molten steel reaches:
C≤0.03； Si≤1.00； Mn≤6.00； ?P≤0.040； ?S≤0.030；
Cr?21.00～26.00； Ni?1.35～8.00； ?Mo?0.10～5.00； ?Cu≤0.80；
N 0.100～0.320; All the other are Fe and unavoidable impurities;
Ladle bottom blowing Ar, intensity 1.5～2.5L/min.t, weak stirring 10～15min; Refining finishes to water the calm time 18～25min of molten steel to unwrapping greatly;
IIThe molten steel that wraps is greatly watered tundish, 20～45 ℃ of the degrees of superheat; Immerse mouth of a river insertion depth 100～145mm; Pulling rate 0.75～1.15min; Specific water 0.30～0.32L/Kg; Add crystallizer protecting residue: basicity 0.85～0.95,1090～1110 ℃ of fusing points, viscosity 1.5～1.7dpa.s;
IIIContinuous casting becomes section 325-710cm
2Continuous casting billet, use the crystallizer electromagnetic agitation, current strength 500～700A, frequency 4～5Hz.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210213497.6A CN102717045B (en) | 2012-06-27 | 2012-06-27 | Double-phase stainless steel continuous casting method |
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| CN201210213497.6A CN102717045B (en) | 2012-06-27 | 2012-06-27 | Double-phase stainless steel continuous casting method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105018761A (en) * | 2015-07-28 | 2015-11-04 | 山西太钢不锈钢股份有限公司 | Continuous casting method for high-manganese and high-aluminum type austenite low-magnetic steel |
| CN106521355A (en) * | 2016-11-25 | 2017-03-22 | 四川六合锻造股份有限公司 | Double-phase stainless steel as well as preparation method and application thereof |
| CN106591735A (en) * | 2016-12-05 | 2017-04-26 | 四川六合锻造股份有限公司 | Super duplex stainless steel and preparation method therefor |
| CN108486480A (en) * | 2018-06-07 | 2018-09-04 | 东北大学 | A kind of manufacturing method of Thin Specs hot rolling biphase plate |
| CN109014095A (en) * | 2017-06-12 | 2018-12-18 | 鞍钢股份有限公司 | A method of reducing slab Li-adding Al alloy kind slab air blister defect |
| CN109898015A (en) * | 2019-02-01 | 2019-06-18 | 上海加宁新材料科技有限公司 | The manufacturing method of naval vessel seawater corrosion resistance HDR two phase stainless steel |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105018761A (en) * | 2015-07-28 | 2015-11-04 | 山西太钢不锈钢股份有限公司 | Continuous casting method for high-manganese and high-aluminum type austenite low-magnetic steel |
| CN105018761B (en) * | 2015-07-28 | 2017-01-11 | 山西太钢不锈钢股份有限公司 | Continuous casting method for high-manganese and high-aluminum type austenite low-magnetic steel |
| CN106521355A (en) * | 2016-11-25 | 2017-03-22 | 四川六合锻造股份有限公司 | Double-phase stainless steel as well as preparation method and application thereof |
| CN106521355B (en) * | 2016-11-25 | 2019-04-12 | 四川六合锻造股份有限公司 | A kind of two phase stainless steel and its preparation method and application |
| CN106591735A (en) * | 2016-12-05 | 2017-04-26 | 四川六合锻造股份有限公司 | Super duplex stainless steel and preparation method therefor |
| CN109014095A (en) * | 2017-06-12 | 2018-12-18 | 鞍钢股份有限公司 | A method of reducing slab Li-adding Al alloy kind slab air blister defect |
| CN109014095B (en) * | 2017-06-12 | 2020-07-17 | 鞍钢股份有限公司 | Method for reducing casting blank bubble defects of Cr-containing steel type of plate blank |
| CN108486480A (en) * | 2018-06-07 | 2018-09-04 | 东北大学 | A kind of manufacturing method of Thin Specs hot rolling biphase plate |
| CN109898015A (en) * | 2019-02-01 | 2019-06-18 | 上海加宁新材料科技有限公司 | The manufacturing method of naval vessel seawater corrosion resistance HDR two phase stainless steel |
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