CN103060523A - Smelting method for non-magnetic stainless steel - Google Patents
Smelting method for non-magnetic stainless steel Download PDFInfo
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- CN103060523A CN103060523A CN2013100395020A CN201310039502A CN103060523A CN 103060523 A CN103060523 A CN 103060523A CN 2013100395020 A CN2013100395020 A CN 2013100395020A CN 201310039502 A CN201310039502 A CN 201310039502A CN 103060523 A CN103060523 A CN 103060523A
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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, nickel content is higher in the molten steel, is mainly austenitic structure, and steel is responsive to inclusion, and rolling plasticity is poor, rolls the rear surface and very easily produces line defect, and it is many to declare useless amount, 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, and the major control difficult point is that the enrichment of steel intergranular ［ S ］ causes plasticity poor, rolls the rear surface and produces the wire strip flaw.
Summary of the invention
In order to overcome the above-mentioned deficiency of the smelting process that has magnetism-free stainless steel now, the invention provides a kind of occupy-place that reduces sulphur in the 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.
Be added to after the tapping in the AOD stove.The temperature of molten steel is 1450～1500 ℃.
IIAOD smelts
Molten steel is heating by O2 blowing in the AOD stove, 1650～1670 ℃ of decarburizations of the temperature of molten steel, and carbon rejection process is according to AOD intelligence steel-making program second-level model SMP control, and adjusting operation will be aspired for stability, and stable purpose 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 with reference to AOD intelligence steel-making second-level model control calculation result, molten steel 18～20kg per ton, when the S content in the molten steel is not higher than 0.0046, thoroughly remove the prereduction slag, take off the quantity of slag necessary＞80%, the reducing slag dual alkalinity requires 1.8～2.0%, the fire door zone is revealed the molten steel diameter and is reached 1～1.2m.
The rear adding lime of skimming is made new slag, and 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 the slag making Argon is not less than 4 minutes, the S of the molten steel in the assurance product≤0.001%.
IIIThe LF stove is smelted
Molten steel heats up for first electricity to the LF station, presses 3～6 ℃ of control of per minute intensification electric power feeding times, and the temperature of molten steel reaches 1520～1530 ℃, send electricity to finish, molten steel Ca Si wire feeding 1.2 ± 0.5m per ton, and add ferro-boron, add-on molten steel 3.5～4.0 kg ferro-borons per ton.Carry out the Argon stirring operation after adding ferro-boron, hard blowing mould formula flow guarantees that greater than 60L/min the molten steel face turns over greatly, and the hold-time can fully float inclusion greater than 5 minutes.Firmly blow after 5 minutes and change soft blow over to, flow 20～50 L/min.
IVContinuous casting
Qualified molten steel is cast continuously cast bloom by continuous casting process, 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 the AOD reduction, ［ S ］ is to 10ppm in the reduction molten steel, reduce the enrichment of steel intergranular ［ S ］, stir in LF stove enlargement discharge Argon, and adding 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, so ［ S ］ these two factors in the occupy-place of boron and the further minimizing molten steel can effectively increase billet rolling plasticity, it is good to roll the rear surface, do not produce line and split defective, 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
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
The steel grade that present embodiment is smelted is 0Cr16Ni14,165 tons of weight.The operational path of present embodiment is: electrosmelting-AOD-LF-continuous casting
Present embodiment comprises following step successively:
IElectrosmelting
Electric furnace outsourcing home scrap and various alloying ingredient, 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 the requirement:
C 1.6%； Cr 18.5%； Ni 9.5%； P 0.001%；
All the other are Fe and inevitable impurity.
Be added to after the tapping in the AOD stove.The temperature of molten steel is 1480 ℃.
IIAOD smelts
Molten steel is heating by O2 blowing in the AOD stove, and molten steel reaches 1650 ℃ of decarburizations, and carbon rejection process is according to AOD intelligence steel-making program second-level model SMP control, and adjusting operation will be aspired for stability, and stable purpose 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 carried out reference with AOD intelligence steel-making second-level model control calculation result, when the S content in the molten steel reaches 0.0046, thoroughly remove the prereduction slag, take off the quantity of slag＞80%, the reducing slag dual alkalinity requires 1.8～2.0%, and the fire door zone is revealed the molten steel diameter and reached 1～1.2m.
The rear adding lime of skimming is made new slag, and add-on is molten steel 9kg per ton, and with Ca-Si powder, each the 15kg residue adjustment of AL powder, slag is light green or yellow-white, slag making Argon 4 minutes, the S of the molten steel in the assurance product≤0.001%.
IIIThe LF stove is smelted
Molten steel heats up for first to LF station electricity, and per minute heats up 4 ℃, send electric several minutes after, the temperature of molten steel reaches 1520 ℃, send electricity to finish, Ca Si wire feeding 200m, and add ferro-boron, add-on molten steel 3.8 kg ferro-borons per ton.Carry out the Argon stirring operation after adding ferro-boron, hard blowing mould formula flow 65L/min guarantees that the molten steel face turns over greatly, 6 minutes hold-times, can fully float inclusion.Firmly blow after 5 minutes and change soft blow over to, flow 30 L/min.
IVContinuous casting
Qualified molten steel is cast continuously cast bloom, the long 8000mm of continuously cast bloom, wide 1015mm, thick 180mm by continuous casting process.
Claims (1)
1. the smelting process of a 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;
Be added to after the tapping in the AOD stove, the temperature of molten steel is 1450～1500 ℃;
IIAOD smelts
Molten steel is heating by O2 blowing in the AOD stove, 1650～1670 ℃ of decarburizations of the temperature of molten steel, and adjusting operation will be aspired for stability, and stable purpose is to avoid reducing front warming temperature and the rear blowback of reduction;
When carbon content≤0.02%, decarburization finishes;
Add reduction by ferrosilicon when the temperature of molten steel reaches 1700～1750 ℃, molten steel 18～20kg per ton is not when the S content in the molten steel is higher than 0.0046, thoroughly remove the prereduction slag, take off the quantity of slag necessary＞80%, the reducing slag dual alkalinity requires 1.8～2.0%, the fire door zone is revealed the molten steel diameter and is reached 1～1.2m;
The rear adding lime of skimming is made new slag, and 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 the slag making Argon is not less than 4 minutes, the S of the molten steel in the assurance product≤0.001%;
IIIThe LF stove is smelted
Molten steel heats up for first electricity to the LF station, presses 3～6 ℃ of control of per minute intensification electric power feeding times, and the temperature of molten steel reaches 1520～1530 ℃, send electricity to finish, molten steel Ca Si wire feeding 1.2 ± 0.5m per ton, and add ferro-boron, add-on molten steel 3.5～4.0 kg ferro-borons per ton; Carry out the Argon stirring operation after adding ferro-boron, hard blowing mould formula flow guarantees that greater than 60L/min the molten steel face turns over greatly, and the hold-time can fully float inclusion greater than 5 minutes; Firmly blow after 5 minutes and change soft blow over to, flow 20～50 L/min;
IVContinuous casting
Molten steel is cast continuously cast bloom by continuous casting process.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111763802A (en) * | 2020-07-06 | 2020-10-13 | 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 |
| CN112126843A (en) * | 2020-09-24 | 2020-12-25 | 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 |
| TWI752837B (en) * | 2020-02-27 | 2022-01-11 | 日商日鐵不銹鋼股份有限公司 | Stainless steel, stainless steel material, and method for manufacturing stainless steel |
| 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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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| TWI752837B (en) * | 2020-02-27 | 2022-01-11 | 日商日鐵不銹鋼股份有限公司 | Stainless steel, stainless steel material, and method for manufacturing stainless steel |
| CN111763802A (en) * | 2020-07-06 | 2020-10-13 | 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 |
| 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 |
| CN112126843A (en) * | 2020-09-24 | 2020-12-25 | 山西太钢不锈钢股份有限公司 | 6% Mo super austenitic stainless steel and preparation method thereof |
| 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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| CN103060523B (en) | 2014-12-03 |
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