CN101633038B - Method for reducing surface defect of stainless steel continues casting blank - Google Patents
Method for reducing surface defect of stainless steel continues casting blank Download PDFInfo
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- CN101633038B CN101633038B CN2009100744909A CN200910074490A CN101633038B CN 101633038 B CN101633038 B CN 101633038B CN 2009100744909 A CN2009100744909 A CN 2009100744909A CN 200910074490 A CN200910074490 A CN 200910074490A CN 101633038 B CN101633038 B CN 101633038B
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Abstract
The invention discloses a method for reducing a surface defect of stainless steel continues casting blank. The casting block meets the following requirement: when Ti is larger than and equal to 0 and is less than and equal to 0.1%, S is less than and equal to 0.08%, and Si is larger than and equal to 0.358%, or Si is less than 0.35%, aluminum content is 0.01-0.03%. An adaptive produce flow procedure is as follows: an electric furnace, an induction furnace or a revolving furnace-AOD furnace refining or VOD furnace refining-an argon flushing station or an LF furnace refining-continuously casting; and an AOD furnace or VOD steel ladle is at least used at once. The method comprises the following steps of: 1 adding liquid steel smelted from the electric furnace, the induction furnace or the revolving furnace into the AOD furnace or the VOD furnace to be refined; 2 argon flushing and stirring the liquid steel in steel ladle, wherein flushing and stirring tine is larger than and equal to 10 minutes, and the liquid steel can not be exposed to the air during stirring; and 3 putting the steel ladle into a continues casting machine, automatically opening the steel ladle, and forbidding opening water gap by means of oxygen blowing, wherein the technical requirement during continuously casting is as followings: continuous casting speed is larger than and equal to 1.0m/min, the fluctuation of the casting speed is not larger than +/-0.02m/min, casting negative slip time is lees than and equal to 0.20 seconds, and the liquid surface fluctuation of a crystallizer is not larger than +/-5m. The method obviously reduces the surface defect of the stainless steel continues casting blank with titanium content which is not larger than 0.10%.
Description
Technical field
The present invention relates to a kind of method that reduces surface defect of stainless steel casting blank, specifically, is to reduce the method that titaniferous is not more than 0.10% surface defect of stainless steel casting blank.
Background technology
Stainless steel is the abbreviation or the general designation of stainless steel and acid resisting steel, refer to that chrome content is more than 10.5%, can resist a class ferrous alloy of corrosion in air and fresh water or in the chemical attack medium, the preparation technology of existing stainless steel casting blank, owing to reasons such as fluctuation of service, equipment fault and technological parameter control are unreasonable, stainless steel casting blank surface or the serious defective of subcutaneous general existence, as crackle, be mingled with, depression etc., these defectives are difficult to find, or under actual production conditions, can't go to find etc.So stainless steel casting blank in rolling heating process, the top layer amount of oxidation seldom, the strand surface defect is difficult to pine for removing adding, and behind rolled products, defective occurs on the surface easily.And stainless steel product is very high to surperficial quality requirement, so must eliminate or reduce surface defect of stainless steel casting blank, the method of existing reduction surface defect of stainless steel casting blank generally is the metal (percentage by weight) of stainless steel casting blank figuring of surface more than 1.0%, promptly, just can be rolled product the more stainless steel casting blank surface removal of defective (if the rolling flat cold-rolled sheet disqualification rate percentage by weight of continuous casting billet not reconditioning of surface is near 6%).Now do not have open and science, comprehensive not reconditioning of stainless steel casting blank surface control method, random reconditioning stainless steel casting blank surface, cause on the one hand metal loss, what of reconditioning weight on the other hand do not have corresponding relation with the cc billet surface quality situation, can cause the unstable product quality phenomenon.
Summary of the invention
In order to overcome the existing above-mentioned deficiency that reduces the method for surface defect of stainless steel casting blank, the invention provides a kind of method that reduces surface defect of stainless steel casting blank, the present invention can obviously reduce the defective that titaniferous is not more than 0.10% stainless steel casting blank surface, the corrosion resistant plate that is rolled into is because the corrosion resistant plate surface defect rate that surface inclusion causes is less than 1.0% (mass percent).
The present invention gives chapter and verse and controls stainless steel smelting, continuous casting production process technological parameter, produce surface quality defect stainless steel casting blank seldom, this not reconditioning of stainless steel casting blank surface is directly rolling, and the surface quality of corrosion resistant plate more than 99% that is rolled into satisfies standard-required.The metal loss of having avoided stainless steel casting blank in the reconditioning surface process, to cause.
The method of this reduction surface defect of stainless steel casting blank is as follows respectively to the requirement of steel strand, production procedure and equipment:
One, composition requirement
Mass percent 0≤Ti≤0.1% of the titaniferous in a stainless steel casting blank;
The mass percent S of sulfur-bearing≤0.008% in the b stainless steel casting blank;
Mass percent Si 〉=0.35% or Si＜0.35% an o'clock aluminum content siliceous in the c stainless steel casting blank control to 0.01～0.03%;
Two, the stainless steel production procedure of Shi Yinging
Electric furnace, induction furnace or converter → AOD stove refining or VOD stove refining → Argon station or LF stove refining → continuous casting;
Three, equipment requirement
A AOD furnace shell and ladle, the VOD ladle is minimum used once.
B AOD, VOD smelted furnace cinder basicity (CaO/SiO
2) 〉=1.6.
The method of this reduction surface defect of stainless steel casting blank comprises following sequential steps:
One, the mass percent that electric furnace, induction furnace or converter smelting the are gone out molten steel that meets following requirement joins AOD stove or the refining of VOD stove:
C?0.10％～2.5％ Si≤0.25％ P≤0.035％ S≤0.025％
Elements such as Mn, Cr, Ni, Mo, Cu, Nb, N, W, Co meet standard (standards such as GB, ASTM, EN, the JIS) requirement of the product of producing.All the other are Fe and unavoidable impurities.
The mass percent of smelting the composition (C, Si, Mn, P, S, Cr, Ni, Mo, Cu, Nb, Ti, N, W, Co) of back molten steel reaches corresponding product standard or enterprises control requirement, as standard-requireds such as GB, ASTM, EN, JIS.
All the other are Fe and unavoidable impurities.
Two, molten steel Argon mixing time 〉=10 minute in ladle (ladle of AOD stove, VOD stove or LF stove), whipping process control slag covers above the molten steel, and molten steel must not expose under the air.
Three, ladle is to conticaster, and ladle is opened cast automatically, forbids opening the mouth of a river with oxygen blast gas.Specification requirement during continuous casting:
The temperature of a tundish molten steel is than the high 20-40 of fusing point ℃ of molten steel.Liquid level 〉=the 800mm of molten steel in the tundish.
B continuous casting pulling rate 〉=1.0m/min, and the pulling rate undulating value is not more than ± 0.02m/min.
The c continuous casting is calculated as follows the negative slip time, control negative slip time≤0.20 second.
b
In the formula:: t
N---the negative slip time, unit is second
π——3.1416
F---continuous cast mold shakes frequently, unit/minute
V
C---the continuous casting pulling rate, unit rice/minute
H---continuous cast mold amplitude, the unit millimeter
The d liquid level fluctuation of crystallizer is not more than ± 5mm.
The method of above-mentioned reduction surface defect of stainless steel casting blank in order to make the rolling cold rolling product surface quality of strand better, needs to check casting billet surface behind the cast strand, makes the casting billet surface defective reach the requirement of following table 1:
Table 1
Remarks: bight vertically depression refers to that wide of strand is last apart from the 200mm of limit portion, along the depression of throwing direction.
The present invention reaches certain requirement according to control stainless steel smelting, continuous casting production process technological parameter, because the method for this reduction surface defect of stainless steel casting blank has reduced the defective on continuous casting billet surface effectively, the stainless steel casting blank surface directly is rolled into steel plate without reconditioning, product quality more than 99% satisfies the national standard requirement, has obviously improved the qualification rate that is rolled into product.
The specific embodiment
Below in conjunction with embodiment, describe the specific embodiment that this reduction titaniferous is not more than the method for 0.10% surface defect of stainless steel casting blank in detail, but the specific embodiment of the method for this surface defect of stainless steel casting blank is not limited to following embodiment.
Embodiment one
Date: on July 31st, 2008.
The technological process of production: 160 tons of electric arc furnaces → 180 ton AOD stove → Argon station → vertical with bending type continuous casting machines
Continuous casting billet specification: 200 (thick) * 1535 (wide) mm
The molten steel composition that 160 tons of electric arc furnaces are come out of the stove is as follows:
C：1.67％ Si?0.21％ P?0.017％ S?0.021％ Mn?0.24％ Cr?12.69％
N 0.022% Ti 0.01% Al 0.02% surplus is iron and unavoidable impurities.
The time contents processing
14:20 handles molten steel to AOD, the AOD furnace lining has used 52 times.
The 15:16 molten steel disposes at AOD, basicity of slag (CaO/SiO
2) be 1.72.The mass percent of molten steel composition reaches the requirement of table 2:
Table 2
Annotate: surplus is an iron.Fusing point: 1506 ℃.
The 15:25 molten steel is to the Argon station, and the steel ladle bottom argon blowing of AOD stove stirred molten steel 11 minutes, and in the whipping process, slag covers above the molten steel, and molten steel must not expose under the air.
The whipping process molten steel covers under the slag, under the not exposed air of molten steel.
The 15:42 molten steel arrives conticaster, and the ladle of AOD stove is opened cast (must not oxygen blast gas open) automatically.
The ladle thermometric is 1538 ℃, 1537 ℃, 1540 ℃, 1539 ℃ in the middle of the 15:57-16:33.The liquid level 900-1000mm of the normal molten steel of middle ladle.The normal pulling rate 1.0m/min of continuous casting, pulling rate fluctuation is within ± 0.01m/min.According to calculating formula provided by the invention, calculate the negative slip time in 0.15-0.18 second.Liquid level fluctuation of crystallizer at-3.11mm to+4.23mm.It is 7 that this stove is produced continuous casting billet, second day, checks that the defective of casting billet surface sees Table 3
Table 3
7 blocks of continuous casting billets through not reconditioning directly rolling after, the cold-reduced sheet surface reaches standard-requireds such as GB, ASTM, EN, JIS.
Embodiment two,
Steel grade: 00Cr12
Date of manufacture: on January 2nd, 2008
The technological process of production: 90 top bottom blowing converter → 90VOD (vacuum oxygen decarburization refining furnace) → LF stove (ladle refining furnace) → vertical with bending type continuous casting machine
Continuous casting billet specification: 220 (thick) * 1235 (wide) mm
The molten steel composition of 90 top bottom blowing converters is as follows:
C：0.18％ Si?0.11％ P?0.015％ S?0.006％ Mn?0.47％ Cr?11.88％
N 0.020% Ti 0.01% Al 0.01% surplus is iron and unavoidable impurities
The time contents processing
2:24 molten steel to 90 ton VOD handles, and VOD ladle furnace lining has used 11 times.
The 3:20 molten steel disposes at VOD, basicity of slag (CaO/SiO
2) be 1.84.The mass percent of molten steel composition sees Table 4:
Table 4
Annotate: surplus is an iron.Fusing point: 1500 ℃.
The 3:25 molten steel is to the LF stove, 1566 ℃ of thermometrics.The steel ladle bottom argon blowing of LF stove stirred molten steel 10 minutes, and in the whipping process, slag covers above the molten steel, and molten steel must not expose under the air.
The 3:32 molten steel arrives conticaster, and the ladle of LF stove is opened cast (must not oxygen blast gas open) automatically.
The ladle thermometric is 1532 ℃, 1530 ℃, 1529 ℃, 1530 ℃ in the middle of the 3:34-4:15.The normal liquid level 900-1000mm of middle ladle.The normal pulling rate 1.0m/min of continuous casting, pulling rate fluctuation is within ± 0.01m/min.According to calculating formula provided by the invention, calculate the negative slip time in 0.15-0.18 second.Liquid level fluctuation of crystallizer at-3.0mm to+4.0mm.
It is 6 that this stove is produced continuous casting billet, and strand is not checked case of surface defects, and it is rolling that direct entrucking is transported to continuous hot-rolling mill.6 blocks of continuous casting billets through not reconditioning directly rolling after, the cold-reduced sheet surface reaches standard-requireds such as GB, ASTM, EN, JIS.
Embodiment three,
Steel grade: 0Cr18Ni9
Date of manufacture: on July 17th, 2008
The technological process of production: 160 electric furnaces → 180AOD stove → Argon station → vertical with bending type continuous casting machine
Continuous casting billet specification: 200 (thick) * 1280 (wide) mm
The molten steel composition that 160 tons of electric furnaces are come out of the stove is as follows:
C：1.77％ Si?0.18％ P?0.028％ S?0.017％ Mn?0.97％ Cr?17.14％
Ni 7.92% N 0.031% Ti 0.01% Al 0.01% surplus is iron and unavoidable impurities
The time contents processing
The 16:18 molten steel is handled to AOD, and the AOD furnace lining has used 122 times.
The 17:20 molten steel disposes at AOD, basicity of slag (CaO/SiO
2) be 1.68.The mass percent of molten steel composition sees Table 5.
Table 5
Annotate: surplus is an iron.Fusing point: 1460 ℃
The 17:28 molten steel is to the Argon station, and the steel ladle bottom argon blowing of AOD stove stirred molten steel 12 minutes, and the whipping process slag covers above the molten steel, and molten steel must not expose under the air.
The 17:37 molten steel arrives conticaster, and the ladle of AOD stove is opened cast (forbid oxygen blast gas open) automatically.
The ladle thermometric is 1492 ℃, 1489 ℃, 1490 ℃, 1491 ℃ in the middle of the 17:39-18:44.The normal liquid level 900-1000mm of middle ladle.The normal pulling rate 1.3m/min of continuous casting, pulling rate fluctuation is within ± 0.015m/min.According to calculating formula provided by the invention, calculate the negative slip time in 0.12-0.16 second.Liquid level fluctuation of crystallizer at-3.0mm to+4.02mm.
It is 9 that this stove is produced continuous casting billet, and strand is not checked case of surface defects, and it is rolling directly to adopt roller-way to be transported to continuous hot-rolling mill.9 blocks of continuous casting billets through not reconditioning directly rolling after, the cold-reduced sheet surface reaches standard-requireds such as GB, ASTM, EN, JIS.
The present invention reaches certain requirement according to control stainless steel smelting, continuous casting production process technological parameter, makes the process control method of stainless steel casting blank surface without the direct rolled products of reconditioning, and the cold-rolled steel sheet quality more than 99% satisfies standard-required.
Claims (2)
1. method that reduces surface defect of stainless steel casting blank, to strand, production procedure and equipment require as follows:
(1) composition requirement
Mass percent 0≤Ti≤0.1% of the titaniferous in a stainless steel casting blank;
The mass percent S of sulfur-bearing≤0.008% in the b stainless steel casting blank;
Mass percent Si 〉=0.35% or Si＜0.35% an o'clock aluminum content siliceous in the c stainless steel casting blank control to 0.01～0.03%;
(2) the stainless steel production procedure of Shi Yinging
Electric furnace, induction furnace or converter → AOD stove refining or VOD stove refining → Argon station or LF stove refining → continuous casting;
(3) equipment requirement
A AOD furnace shell and ladle, the VOD ladle is minimum used once;
B AOD, VOD smelted furnace cinder basicity CaO/SiO
2〉=1.6;
The method of this reduction surface defect of stainless steel casting blank comprises following sequential steps:
(1) mass percent that electric furnace, induction furnace or converter smelting the are gone out molten steel that meets following requirement joins AOD stove or the refining of VOD stove:
C?0.10％～2.5％ Si≤0.25％ P≤0.035％ S≤0.025％
Mn, Cr, Ni, Mo, Cu, Nb, N, W, Co element meet the standard-required of the product of producing, and all the other are Fe and unavoidable impurities;
The mass percent of C, the Si of molten steel, Mn, P, S, Cr, Ni, Mo, Cu, Nb, Ti, N, W, Co reaches corresponding product standard or enterprises control requirement after smelting, and all the other are Fe and unavoidable impurities;
(2) molten steel Argon mixing time 〉=10 minute in ladle, whipping process control slag covers above the molten steel, and molten steel must not expose under the air;
(3) ladle is to conticaster, and ladle is opened cast automatically, forbids opening the mouth of a river with oxygen blast gas the specification requirement during continuous casting:
The temperature of a tundish molten steel is than the high 20-40 of fusing point ℃ of molten steel, the liquid level 〉=800mm of molten steel in the tundish;
B continuous casting pulling rate 〉=1.0m/min, and the pulling rate undulating value is not more than ± 0.02m/min;
The c continuous casting is calculated as follows the negative slip time, control negative slip time≤0.20 second
In the formula: t
N---the negative slip time, unit is second
π——3.1416
F---continuous cast mold shakes frequently, unit/minute
V
C---the continuous casting pulling rate, unit rice/minute
H---continuous cast mold amplitude, the unit millimeter
The d liquid level fluctuation of crystallizer is not more than ± 5mm.
2. the method for reduction surface defect of stainless steel casting blank according to claim 1 is characterized in that: behind the cast strand, check casting billet surface, make the casting billet surface defective reach the requirement of following table:
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| CN102764870A (en) * | 2012-07-12 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Quality improvement method for low alloy steel continuous casting billet |
| CN103225008B (en) * | 2013-04-22 | 2014-07-30 | 山西太钢不锈钢股份有限公司 | Method for preventing caking in crystallizer and nozzle clogging during process for smelting titanium-containing stainless steel |
| CN103394664A (en) * | 2013-08-06 | 2013-11-20 | 山西太钢不锈钢股份有限公司 | Method for continuously casting 304 type austenitic stainless steel |
| CN106141132A (en) * | 2015-03-31 | 2016-11-23 | 新日铁住金工程技术株式会社 | The manufacture method of strand and continuous casting apparatus |
| JP5896067B1 (en) * | 2015-04-06 | 2016-03-30 | Ｊｆｅスチール株式会社 | Method for producing slabs using a continuous casting machine |
| CN104785737B (en) * | 2015-04-09 | 2016-09-21 | 山西太钢不锈钢股份有限公司 | A kind of method eliminating continuous casting billet surface metal grain defect |
| US11475180B2 (en) * | 2018-03-09 | 2022-10-18 | Tata Consultancy Services Limited | System and method for determination of air entrapment in ladles |
| CN111424134B (en) * | 2020-03-17 | 2022-03-01 | 中北大学 | Production method of iron-chromium-aluminum alloy continuous casting slab |
| CN111957920A (en) * | 2020-07-31 | 2020-11-20 | 天津钢铁集团有限公司 | Method for effectively preventing surface scab of low-carbon steel continuous casting round billet |
| CN112157233B (en) * | 2020-09-30 | 2022-05-24 | 山西太钢不锈钢股份有限公司 | Manufacturing method for two continuous casting of wide steel strip iron-chromium-aluminum alloy continuous casting plate blank |
| CN113502376A (en) * | 2021-06-18 | 2021-10-15 | 鞍钢联众(广州)不锈钢有限公司 | Method for improving secondary skin inclusion of titanium-containing stainless steel billet |
| CN114871292A (en) * | 2022-05-17 | 2022-08-09 | 山西太钢不锈钢股份有限公司 | Manufacturing method for eliminating grinding marks on surface of 300 series stainless steel medium plate |
| CN115505820B (en) * | 2022-09-15 | 2024-01-05 | 山西太钢不锈钢股份有限公司 | Continuous casting method of niobium-containing high-nitrogen nickel-based alloy |
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