CN103060523B - Smelting method for non-magnetic stainless steel - Google Patents
Smelting method for non-magnetic stainless steel Download PDFInfo
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- CN103060523B CN103060523B CN201310039502.0A CN201310039502A CN103060523B CN 103060523 B CN103060523 B CN 103060523B CN 201310039502 A CN201310039502 A CN 201310039502A CN 103060523 B CN103060523 B CN 103060523B
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Abstract
The invention relates to a smelting method for non-magnetic stainless steel. The smelting method comprises the following steps in sequence: I, electric furnace smelting: tapping when components of molten steel meet the following requirements that the content of C is 1.2 to 2.0 percent, the content of Cr is 18 to 19 percent, the content of Ni is 9 to 10 percent, the content of P is less than or equal to 0.02 percent and the balance is Fe and inevitable impurities; II, argon oxygen decarburization (AOD) smelting: blowing oxygen into the molten steel in an AOD furnace, heating and decarbonizing until the content of C is less than or equal to 0.02 percent, adding ferrosilicon for reduction, removing pre-reducing slag until the binary basicity of the reducing slag is 1.8 to 2.0 percent, adding 8 to 10 kg of lime into per ton of molten steel to generate new slag after slag removal, regulating the slag by using 10 to 20 kg of Ca-Si powder and 10 to 20 kg of Al powder until the slag is light green or yellowish white, blowing argon to slag for at least 4 minutes to ensure that the content of S in the molten steel is less than or equal to 0.001 percent; III, LF (ladle furnace) smelting: heating the molten steel by using electricity when the molten steel reaches an LF station, feeding the molten steel to a Ca-Si line, adding ferroboron, and blowing the argon with stirring; and IV, continuous casting. According to the stainless steel which is prepared by using the smelting method for the non-magnetic stainless steel, the occupied positions of S among steel crystals are reduced, and the plasticity of the stainless steel is improved.
Description
Technical field
The present invention relates to a kind of smelting process of magnetism-free stainless steel.
Background technology
The main steel grade 0Cr16Ni14 of magnetism-free stainless steel and 0Cr18Ni12, in molten steel, nickel content is higher, is mainly austenitic structure, and steel is responsive to inclusion, and rolling plasticity is poor, rolls rear surface and very easily produces line defect, sentences useless amount many, and scrap rate is up to 60%.The smelting process of existing magnetism-free stainless steel, generally adopts electric furnace-AOD(VOD)-LF stove-continuous casting process, major control difficult point is that the enrichment of steel intergranular ［ S ］ causes plasticity poor, rolls rear surface and produces wire strip flaw.
Summary of the invention
In order to overcome the above-mentioned deficiency of the smelting process of existing magnetism-free stainless steel, the invention provides a kind of occupy-place that reduces sulphur in steel intergranular, improve steel plasticity, reduce the smelting process of the magnetism-free stainless steel that rolls rear line defect.
Technique of the present invention and basic technology parameter are as follows:
Operational path: 90t electric furnace crude molten steel-45tAOD refining-LF fine setting-continuous casting throwing.
The smelting process of this magnetism-free stainless steel comprises following step successively:
ielectrosmelting
During 1650～1670 ℃ of the temperature of electrosmelting molten steel, when the mass percent of the composition of molten steel reaches following requirement tapping:
C 1.2～2.0% Cr 18～19% Ni 9～10% P≤0.02%
all the other are Fe and inevitable impurity.
After tapping, be added in AOD stove.The temperature of molten steel is 1450～1500 ℃.
iIaOD smelts
Molten steel is heating by O2 blowing in AOD stove, 1650～1670 ℃ of decarburizations of temperature of molten steel, and carbon rejection process is controlled according to AOD intelligence steel-making program second-level model SMP, and adjusting operation will be aspired for stability, and stable object is to avoid reducing front warming temperature and the rear blowback of reduction.
When carbon content≤0.02%, decarburization finishes.
When reaching 1700～1750 ℃, the temperature of molten steel adds reduction by ferrosilicon, add-on is controlled calculation result with reference to AOD intelligence steel-making second-level model, molten steel 18～20kg per ton, S content in molten steel is not higher than 0.0046 time, thoroughly remove prereduction slag, take off the necessary > 80% of the quantity of slag, reducing slag dual alkalinity requires 1.8～2.0%, and fire door region is revealed molten steel diameter and reached 1～1.2m.
After skimming, add lime to make new slag, add-on is molten steel 8～10kg per ton, and with Ca-Si powder, each the 10～20kg residue adjustment of AL powder, slag is light green or yellow-white, and slag making Argon is not less than 4 minutes, guarantees S≤0.001% of the molten steel in product.
iIIlF stove is smelted
Molten steel heats up first to electricity to LF station, by per minute, heats up 3～6 ℃ and controls electric power feeding time, and the temperature of molten steel reaches 1520～1530 ℃, and power transmission finishes, molten steel Ca Si wire feeding per ton 1.2 ± 0.5m, and add ferro-boron, add-on molten steel 3.5～4.0 kg ferro-borons per ton.After adding ferro-boron, carry out Argon stirring operation, hard blowing mould formula flow is greater than 60L/min, guarantees that molten steel face turns over greatly, and the hold-time is greater than 5 minutes, and inclusion can fully be floated.Firmly blow after 5 minutes and proceed to soft blow, flow 20～50 L/min.
iVcontinuous casting
Qualified molten steel, by continuous casting process, is cast continuously cast bloom, the long 8000～10000mm of continuously cast bloom, wide 1015～1237mm, thick 180mm.
The beneficial effect of the smelting process of this magnetism-free stainless steel is to reduce to roll rear line and split waste product.Because the present invention strengthens AOD reduction, reduce ［ S ］ in molten steel and arrive 10ppm, reduce the enrichment of steel intergranular ［ S ］, in LF stove enlargement discharge Argon, stir, and add ferro-boron, further reduce the occupy-place of S, but can not produce free [B] exists in steel, the plasticity of boron is better than element sulphur, therefore ［ S ］ these two factors in the occupy-place of boron and further minimizing molten steel can effectively increase billet rolling plasticity, roll rear surface good, do not produce line and split defect, improved and rolled the full lattice rate of rear check, scrap rate drops to below 1% by 60%.The present invention is applicable to the smelting process of 0Cr16Ni14 and 0Cr18Ni12 magnetism-free stainless steel.
Embodiment
Below in conjunction with embodiment, describe the specific embodiment of the present invention in detail, but the specific embodiment of the present invention is not limited to following embodiment.
embodiment mono-
the steel grade that the present embodiment is smelted is 0Cr16Ni14,165 tons of weight.The operational path of the present embodiment is: electrosmelting-AOD-LF-continuous casting
The present embodiment comprises following step successively:
ielectrosmelting
Outsourcing home scrap and various alloying ingredient for electric furnace, change clear value and will meet following requirement:
C 1.6%； Cr 18.5%； Ni 9.5%； P 0.001%；
all the other are Fe and inevitable impurity.
The temperature of electrosmelting molten steel is 1650 ℃, tapping when the mass percent of the composition of molten steel reaches following requirement:
C 1.6%； Cr 18.5%； Ni 9.5%； P 0.001%；
all the other are Fe and inevitable impurity.
After tapping, be added in AOD stove.The temperature of molten steel is 1480 ℃.
iIaOD smelts
Molten steel is heating by O2 blowing in AOD stove, and molten steel reaches 1650 ℃ of decarburizations, and carbon rejection process is controlled according to AOD intelligence steel-making program second-level model SMP, and adjusting operation will be aspired for stability, and stable object is to avoid reducing front warming temperature and the rear blowback of reduction.
During carbon content 0.0018%, decarburization finishes.
When reaching 1720 ℃, the temperature of molten steel adds reduction by ferrosilicon, add-on is molten steel 19kg per ton, add-on is controlled calculation result with AOD intelligence steel-making second-level model and is carried out reference, when the S content in molten steel reaches 0.0046, thoroughly remove prereduction slag, the amount of skimming > 80%, reducing slag dual alkalinity requires 1.8～2.0%, and fire door region is revealed molten steel diameter and is reached 1～1.2m.
After skimming, add lime to make new slag, add-on is molten steel 9kg per ton, and with Ca-Si powder, each 15kg residue adjustment of AL powder, slag is light green or yellow-white, slag making Argon 4 minutes, S≤0.001% of the molten steel in assurance product.
iIIlF stove is smelted
Molten steel heats up first to electricity to LF station, and per minute heats up 4 ℃, and after power transmission several minutes, the temperature of molten steel reaches 1520 ℃, and power transmission finishes, Ca Si wire feeding 200m, and add ferro-boron, add-on molten steel 3.8 kg ferro-borons per ton.After adding ferro-boron, carry out Argon stirring operation, hard blowing mould formula flow 65L/min, guarantees that molten steel face turns over greatly, 6 minutes hold-times, can fully float inclusion.Firmly blow after 5 minutes and proceed to soft blow, flow 30 L/min.
iVcontinuous casting
Qualified molten steel, by continuous casting process, is cast continuously cast bloom, the long 8000mm of continuously cast bloom, wide 1015mm, thick 180mm.
Claims (1)
1. a smelting process for magnetism-free stainless steel, it comprises following step successively:
ielectrosmelting
During 1650～1670 ℃ of the temperature of electrosmelting molten steel, when the mass percent of the composition of molten steel reaches following requirement tapping:
C 1.2～2.0% Cr 18～19% Ni 9～10% P≤0.02%
all the other are Fe and inevitable impurity;
After tapping, be added in AOD stove, the temperature of molten steel is 1450～1500 ℃;
iIaOD smelts
Molten steel is heating by O2 blowing in AOD stove, 1650～1670 ℃ of decarburizations of temperature of molten steel, and adjusting operation will be aspired for stability, and stable object is to avoid reducing front warming temperature and the rear blowback of reduction;
When carbon content≤0.02%, decarburization finishes;
When reaching 1700～1750 ℃, the temperature of molten steel adds reduction by ferrosilicon, molten steel 18～20kg per ton, S content in molten steel is not higher than 0.0046 time, thoroughly remove prereduction slag, take off the necessary > 80% of the quantity of slag, reducing slag dual alkalinity requires 1.8～2.0%, and fire door region is revealed molten steel diameter and reached 1～1.2m;
After skimming, add lime to make new slag, add-on is molten steel 8～10kg per ton, and with Ca-Si powder, each the 10～20kg residue adjustment of Al powder, slag is light green or yellow-white, and slag making Argon is not less than 4 minutes, guarantees S≤0.001% of the molten steel in product;
iIIlF stove is smelted
Molten steel heats up first to electricity to LF station, by per minute, heats up 3～6 ℃ and controls electric power feeding time, and the temperature of molten steel reaches 1520～1530 ℃, and power transmission finishes, molten steel Ca Si wire feeding per ton 1.2 ± 0.5m, and add ferro-boron, add-on molten steel 3.5～4.0 kg ferro-borons per ton; After adding ferro-boron, carry out Argon stirring operation, hard blowing mould formula flow is greater than 60L/min, guarantees that molten steel face turns over greatly, and the hold-time is greater than 5 minutes, and inclusion can fully be floated; Firmly blow after 5 minutes and proceed to soft blow, flow 20～50 L/min;
iVcontinuous casting
Molten steel, by continuous casting process, is cast continuously cast bloom.
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| CN107217123A (en) * | 2017-05-26 | 2017-09-29 | 响水恒生不锈钢铸造有限公司 | A kind of AOD tappings processing method |
| KR20220125343A (en) * | 2020-02-27 | 2022-09-14 | 닛테츠 스테인레스 가부시키가이샤 | Stainless steel, stainless steel material and method of manufacturing stainless steel |
| CN111763802B (en) * | 2020-07-06 | 2021-09-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for smelting 20Mn23AlV non-magnetic steel by AOD converter |
| CN112126843B (en) * | 2020-09-24 | 2021-12-17 | 山西太钢不锈钢股份有限公司 | 6% Mo super austenitic stainless steel and preparation method thereof |
| CN113186445A (en) * | 2021-03-31 | 2021-07-30 | 中北大学 | Method for controlling inclusion content of stainless steel product |
| CN114807752A (en) * | 2022-04-13 | 2022-07-29 | 太原钢铁(集团)有限公司 | Low-cost high-titanium heat-resistant austenitic stainless steel and preparation method thereof |
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| CN101928804A (en) * | 2010-08-31 | 2010-12-29 | 振石集团东方特钢股份有限公司 | Production method of austenitic stainless steel |
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| KR100317548B1 (en) * | 1999-01-27 | 2001-12-22 | 권영한 | A method for producing austenite stainless steel dissolved high content of nitrogen |
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| CN101538689B (en) * | 2008-03-21 | 2011-05-11 | 宝山钢铁股份有限公司 | Non-magnetic stainless steel with high strength and toughness, manufacturing method and application thereof |
| CN101338402A (en) * | 2008-08-19 | 2009-01-07 | 山西太钢不锈钢股份有限公司 | Copper-containing ferrite antimicrobial stainless steel belt and method for manufacturing same |
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