CN104164606A - Method for smelting iron-chromium-aluminum alloy and adding aluminum - Google Patents
Method for smelting iron-chromium-aluminum alloy and adding aluminum Download PDFInfo
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- CN104164606A CN104164606A CN201410388214.0A CN201410388214A CN104164606A CN 104164606 A CN104164606 A CN 104164606A CN 201410388214 A CN201410388214 A CN 201410388214A CN 104164606 A CN104164606 A CN 104164606A
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Abstract
The invention discloses a method for smelting iron-chromium-aluminum alloy and adding aluminum, and belongs to the technical field of smelting. The method comprises a molten steel smelting process and an aluminum adding process, wherein the aluminum adding process is carried out in a VOD furnace, and particularly comprises the following step: smelting iron-chromium-aluminum products by adopting stainless steel smelting equipments such as VOD and the like according to a stainless steel smelting process; the flow comprises a smelting method of an electric furnace and the VOD, a smelting method of an intermediate frequency furnace and the VOD, a smelting method of a converter and the VOD, and a smelting method of the electric furnace, an AOD and the VOD (other smelting furnaces can be utilized after the VOD furnace); the ingredients, the temperature and the slag amount of the molten steel smelted in the first step meet certain requirements; in the VOD furnace smelting in the second step, the yield of aluminum is improved to over 80% by controlling the slag amount in the VOD furnace smelting process by the measures of increasing the stirring intensity in the reduction period and the like according to good air separation ability in the vacuum metallurgy process.
Description
Technical field
The present invention relates to a kind of 20 tons of above VOD stove (vacuum decarburization refining furnace) smelt iron Ohmaxs and add the method for aluminium, belong to metallurgical technology field.
Background technology
Aludirome is to use electric heating engineering materials comparatively widely, and at present, most of enterprise adopts the technology mode of vacuum induction furnace+esr to produce ferrum-chromium-aluminum product, and furnace capacity is little, production efficiency is low, production cost is high.
Aludirome composition is as follows:
C≤0.15%, Si≤1.0%, Mn≤0.70%, P≤0.03%, S≤0.01%, Cr 12.00%-28.00%, Al:3.00%-7.00%, Mo≤3.00%, Co≤1.00%, Nb≤1.00%, Ti≤1.00%, rare earth≤0.50%, Ni≤0.60%, all the other are iron.
Adopt VOD stove smelt iron Ohmax, have a technique difficult problem that adds aluminium.When the smelting reducing phase adds aluminium, because the density of aluminium only has 2.7kg/cm
3, than the density of liquid slag, low (liquid slag density is at 3.0-3.5kg/cm
3), make to be added in the aluminium on slag surface, be difficult to enter molten steel, thereby with liquid slag in MnO, Cr
2o
3, SiO
2, FeO reacts, and aluminium very easily with airborne oxygen generation oxidizing reaction, make aluminium become Al
2o
3, according to the general reduction period of VOD stove, adding aluminium explained hereafter, the recovery rate of aluminium is the highest can only reach 70%.
Summary of the invention
The present invention aims to provide a kind of method that VOD stove smelt iron Ohmax adds aluminium, can make the recovery rate of VOD stove smelt iron Ohmax aluminium bring up to more than 80%.
The detailed process of alloy smelting comprises: 1) electric furnace or induction furnace melt raw material, the refining of VOD stove; 2) converter adopts molten iron, alloy smelting, the refining of VOD stove.
The present invention is by controlling the quantity of slag in VOD stove smelting process; According to the good isolated ability of air of vacuum metallurgy process, and increase the measures such as reduction period stirring intensity, the recovery rate of aluminium is brought up to more than 80%.
A kind of smelt iron Ohmax provided by the invention adds the method for aluminium, comprises smelting molten steel and adds aluminium technique, and the described aluminium technique that adds is carried out in VOD stove, specifically comprises the following steps:
1, smelting molten steel:
By stainless steel-making process, smelt, for VOD provides molten steel, its molten steel composition, temperature, the quantity of slag meet following requirement:
C≤0.50%, Si:0.05-0.70%, Mn:0.001-0.70%, P:0.001-0.03%, S:0.001-0.01%, Cr 12.00%-28.00%, Mo:0.001-3.00%, Co:0.001-1.00%, Nb:0.001-0.50%, Ti:0.001-1.0%, all the other are iron for La+Y:0.001-0.25%; Temperature is 1500-1660 ℃; Molten steel is slag weight in ladle: 0.1-10.0kg/t molten steel;
Smelting equipment described in this step is any in electric furnace, intermediate frequency furnace, converter or electric furnace+AOD;
2, VOD stove adds aluminium technique:
(1) VOD stove is when smelting ferrum-chromium-aluminum, and vacuum tightness is below 50Pa;
(2) VOD oxygen decarburization, when carbon content≤0.01%, stops oxygen blast and controls vacuum values≤50Pa, then only seethes with excitement more than 10 minutes;
(3) adding the front liquid steel temperature of aluminium is controlled at below 1670 ℃;
(4) pass through high hopper, take to add in batches aluminium technique, every batch adds aluminum shot 5-20 kg/tonne molten steel and after adding aluminium, adds lime 1-5kg/ ton molten steel, control argon bottom-blowing flow 0.10-0.20 liter/(minute ton molten steel), stir after 2-3 minute, reduce argon bottom-blowing flow to 0.05-0.10 liter/(minute ton molten steel), every 3-5 minute, by above-mentioned steps, add a collection of secondary aluminium;
The add-on of described aluminium is: by the recovery rate of aluminium in prepared steel grade, be that 90% calculating adds aluminium amount.
(5) after all aluminum shot adds, according to argon bottom-blowing flow 0.05-0.10 liter/(minute ton molten steel), stir after 3-5 minute, improve argon bottom-blowing flow to 0.10-0.25 liter/(minute ton molten steel), then stir 2-3 minute;
(6) ladle vacuum breaker, thermometric, sampling, carry out next step operation according to processing requirement.
According to above step, the recovery rate of aluminium can reach more than 80%.
Of the present invention
beneficial effect:
Adopt the present invention to add in batches aluminium technique, control the parameters in this technological process simultaneously, can make aluminium recovery from less than 70%, bring up to more than 80%.
Embodiment
The method that Aludirome vacuum decarburization refining furnace of the present invention is added to aluminium below by embodiment is elaborated, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment 1: the ferrum-chromium-aluminum steel grade of the present embodiment is 0Cr21Al6.
The composition of this steel grade requires as following table: (unit: %)
The step of the present embodiment is as follows successively:
1, smelting molten steel:
Adopt 90 tons of K-OBM-S converter smeltings, gained crude molten steel composition is as follows:
C:0.32%, Si:0.12%, P:0.013%, S:0.026%, Cr:21.53, Ni:0.04%, all the other are Fe.
Molten steel actual weight is 82 tons; Liquid steel temperature: 1615 ℃; In ladle, slag weight: 122kg(is 1.49kg/t molten steel).
Gained molten steel is for the refining of 90 tons of VOD stoves.
2, furnaceman's VOD skill:
(1) molten steel is poured in VOD stove, control vacuum tightness is 33Pa;
(2) VOD carries out oxygen decarburization, and according to mass spectrograph gasometry result, molten steel carbon component, between 0.005%-0.008%, stops oxygen blast, controls vacuum tightness and reaches 33Pa, then only seethes with excitement 11 minutes.
(3) survey 1603 ℃ of liquid steel temperatures, pass through high hopper, add 500 kilograms of first aluminum shots (6.10kg/t), 200 kilograms, lime (2.44kg/t), control 0.11 liter/min of ton molten steel of argon bottom-blowing flow, stir after 2.5 minutes, reduce argon bottom-blowing flow to 0.06 liter/min ton molten steel, stir after 3.0 minutes, add aluminum shot 700kg(8.54kg/t), 100 kilograms, lime (1.22kg/t), stir after 3.2 minutes, add aluminum shot 1000kg(12.20kg/t), 100 kilograms, lime (1.22kg/t), stir after 4.8 minutes, add aluminum shot 1500kg(18.29kg/t), 100 kilograms, lime (1.22kg/t), again stir after 5 minutes, add aluminum shot 1130kg(13.78kg/t), 100 kilograms, lime (1.22kg/t).
(4) after aluminum shot adds, continue, according to argon bottom-blowing flow to 0.06 liter/(minute ton molten steel), to stir 4.0 minutes, improve argon bottom-blowing flow to 0.24 liter/(minute ton molten steel), stir 2 minutes, assurance aluminium is evenly sneaked in molten steel.
(5) ladle vacuum breaker, thermometric, sampling, analyze molten steel composition:
C: 0.006%, Si:0.41%, Mn:0.13%, P:0.011%, S:0.001%, Cr 19.77%, Ni:0.14%, Al:5.39%, N:0.0043%, all the other are iron.
According to above operation, the recovery rate of aluminium is actual reaches 96.0%.
Embodiment 2: the ferrum-chromium-aluminum steel grade of the present embodiment is 1Cr20Al3.
The composition of this steel grade requires as following table: (unit: %)
The step of the present embodiment is as follows successively:
1, smelting equipment, molten steel condition:
Adopt 90 tons of K-OBM-S converter smeltings, as follows for the crude molten steel composition of VOD:
C:0.28%, Si:0.15%, P:0.012% S:0.018%, Cr:21.08, Ni:0.08%, all the other are Fe.80 tons of molten steel actual weights.Liquid steel temperature: 1608 ℃.Slag weight: 135kg in ladle.
Gained molten steel is for the refining of 90 tons of VOD stoves.
2, furnaceman's VOD skill:
(1) molten steel is poured in VOD stove, control vacuum tightness is 33Pa;
(2) VOD carries out oxygen decarburization, and according to mass spectrograph gasometry result, molten steel carbon component, between 0.006-0.009%, stops oxygen blast, controls vacuum tightness and reaches 33Pa, then only seethes with excitement 10 minutes.
(3) thermometric is 1572 ℃, pass through high hopper, add 600 kilograms of first aluminum shots (7.50kg/t), 200 kilograms, lime (2.50kg/t), control 0.11 liter/min of ton molten steel of argon bottom-blowing flow, stir after 2 minutes, reduce argon bottom-blowing flow to 0.06 liter/min ton molten steel, second batch adds 600 kilograms of aluminum shots (7.50kg/t), 100 kilograms, lime (1.25kg/t), stir after 3.5 minutes, the 3rd batch adds aluminum shot 1000kg(12.5kg/t), 100 kilograms, lime (1.25kg/t), stir after 4 minutes, the 4th batch adds aluminum shot 1450kg(18.13kg/t), 100 kilograms, lime (1.25kg/t).
(4) after aluminum shot adds, continue, according to argon bottom-blowing flow to 0.06 liter/(minute ton molten steel), to stir 4.0 minutes, improve argon bottom-blowing flow to 0.20 liter/(minute ton molten steel), stir 3 minutes, assurance aluminium is evenly sneaked in molten steel.
(5) ladle vacuum breaker, thermometric, sampling, analyze molten steel composition:
C: 0.008%, Si:0.45%, Mn:0.11%, P:0.013%, S:0.001%, Cr 20.15%, Ni:0.10%, Al:3.90%, N:0.0054%, all the other are iron.
According to above operation, the recovery rate of aluminium is actual reaches 88.5%.
Claims (4)
1. smelt iron Ohmax adds a method for aluminium, comprises smelting molten steel and adds aluminium technique, it is characterized in that: the described aluminium technique that adds is carried out in VOD stove, specifically comprises the following steps:
(1) smelting molten steel:
Adopt smelting equipment to smelt by stainless steel-making process, the composition of gained molten steel, temperature, the quantity of slag meet following requirement:
C≤0.50%, Si:0.05-0.70%, Mn:0.001-0.70%, P:0.001-0.03%, S:0.001-0.01%, Cr 12.00%-28.00%, Mo:0.001-3.00%, Co:0.001-1.00%, Nb:0.001-0.50%, Ti:0.001-1.0%, all the other are iron for La+Y:0.001-0.25%; Temperature is 1550-1620 ℃; Molten steel is slag weight in ladle: 0.1-10.0kg/t molten steel;
(2) VOD stove adds aluminium technique:
(1) VOD stove is when smelting ferrum-chromium-aluminum, and vacuum tightness is below 50Pa;
(2) VOD oxygen decarburization, when carbon content≤0.01%, stops oxygen blast and controls vacuum values≤50Pa, then only seethes with excitement more than 10 minutes;
(3) adding temperature in aluminium process is controlled at below 1620 ℃;
(4) pass through high hopper, take to add in batches aluminium technique, every batch adds aluminum shot 5-20 kg/tonne molten steel and after adding aluminium, adds lime 1-5kg/ ton molten steel, control argon bottom-blowing flow 0.10-0.20 liter/(minute ton molten steel), stir after 2-3 minute, reduce argon bottom-blowing flow to 0.05-0.10 liter/(minute ton molten steel), every 3-5 minute, by above-mentioned steps, add a collection of secondary aluminium;
(5) after all aluminum shot adds, according to argon bottom-blowing flow 0.05-0.10 liter/(minute ton molten steel), stir after 3-5 minute, improve argon bottom-blowing flow to 0.10-0.25 liter/(minute ton molten steel), then stir 2-3 minute;
(6) ladle vacuum breaker, thermometric, sampling, carry out next step operation according to processing requirement.
2. smelt iron Ohmax according to claim 1 adds the method for aluminium, it is characterized in that: the smelting equipment in described step () smelting molten steel is any in electric furnace, intermediate frequency furnace, converter or electric furnace+AOD.
3. smelt iron Ohmax according to claim 1 adds the method for aluminium, it is characterized in that: the add-on of described aluminium is: by the recovery rate of aluminium in prepared steel grade, be that 90% calculating adds aluminium amount.
4. smelt iron Ohmax according to claim 1 adds the method for aluminium, it is characterized in that: the recovery rate of described aluminium reaches more than 80%.
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Cited By (7)
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WO2019153772A1 (en) * | 2018-02-08 | 2019-08-15 | 盐城市鑫洋电热材料有限公司 | Method for increasing dimple fracture probability of iron-chromium-aluminum ternary alloy |
WO2019169861A1 (en) * | 2018-03-08 | 2019-09-12 | 盐城市鑫洋电热材料有限公司 | Method for preparing high-aluminum content iron-chromium-aluminum alloy |
CN111424134A (en) * | 2020-03-17 | 2020-07-17 | 中北大学 | Production method of iron-chromium-aluminum alloy continuous casting slab |
EP3674424A4 (en) * | 2017-08-25 | 2020-12-23 | Baoshan Iron & Steel Co., Ltd. | Smelting method for ultra-low carbon 13cr stainless steel |
CN112609132A (en) * | 2020-11-18 | 2021-04-06 | 江苏申源集团有限公司 | Production and preparation method of iron-chromium-aluminum electrothermal alloy wire rod |
CN113174531A (en) * | 2021-03-31 | 2021-07-27 | 中北大学 | Medium-chromium type iron-chromium-aluminum alloy and production method thereof |
CN114086052A (en) * | 2021-12-03 | 2022-02-25 | 宝钢德盛不锈钢有限公司 | Smelting method of low-density stainless steel |
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Cited By (8)
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---|---|---|---|---|
EP3674424A4 (en) * | 2017-08-25 | 2020-12-23 | Baoshan Iron & Steel Co., Ltd. | Smelting method for ultra-low carbon 13cr stainless steel |
WO2019153772A1 (en) * | 2018-02-08 | 2019-08-15 | 盐城市鑫洋电热材料有限公司 | Method for increasing dimple fracture probability of iron-chromium-aluminum ternary alloy |
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CN111424134A (en) * | 2020-03-17 | 2020-07-17 | 中北大学 | Production method of iron-chromium-aluminum alloy continuous casting slab |
CN112609132A (en) * | 2020-11-18 | 2021-04-06 | 江苏申源集团有限公司 | Production and preparation method of iron-chromium-aluminum electrothermal alloy wire rod |
CN113174531A (en) * | 2021-03-31 | 2021-07-27 | 中北大学 | Medium-chromium type iron-chromium-aluminum alloy and production method thereof |
CN113174531B (en) * | 2021-03-31 | 2022-09-02 | 中北大学 | Medium-chromium type iron-chromium-aluminum alloy and production method thereof |
CN114086052A (en) * | 2021-12-03 | 2022-02-25 | 宝钢德盛不锈钢有限公司 | Smelting method of low-density stainless steel |
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