CN101376915B - Method for smelting high-alumina non-magnetic steel - Google Patents
Method for smelting high-alumina non-magnetic steel Download PDFInfo
- Publication number
- CN101376915B CN101376915B CN2008100795357A CN200810079535A CN101376915B CN 101376915 B CN101376915 B CN 101376915B CN 2008100795357 A CN2008100795357 A CN 2008100795357A CN 200810079535 A CN200810079535 A CN 200810079535A CN 101376915 B CN101376915 B CN 101376915B
- Authority
- CN
- China
- Prior art keywords
- steel
- argon
- blowing
- oxygen
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The invention relates to a melting method of high aluminum non-magnetic steel, which comprises the following steps: molten iron pre-treatment, combined blowing converter melting, VD refining, LF refining and continuous casting; the main steps are characterized in that: I. combined blowing converter melting: a. the pre-treated molten iron is put into a combined blowing converter; b. argon is fed in the whole process of bottom blowing; c. manganese metal and ferroaluminum are fed in by a feed chute or an elevated hopper in three batches; d. the adding of the manganese metal and the ferroaluminum is carried out in three steps; and then an oxygen lance is lifted, the argon is blown from bottom, the steel is stirred for 5min to 8min and tapped; e. when the steel is tapped, aluminum or other alloy is added into a ladle; II. VD refining procedure: a. slag is removed before the steel enters; b. conditions when the steel arrives: temperature higher than or equal to 1550 DEG C, slag thickness is less than or equal to 50mm and the clean air is more than or equal to 1250mm; c. argon is blown from bottom after 3min of vacuumization; when the procedure is finished, the argon blowing from the bottom of the ladle is stopped, and the air is broken through after the surface of the steel calms down; III. LF refining procedure: a. slag is modified before the steel enters, aluminum powder is added, CaSi wire is fed; b. the tapped components are controlled according to the target finished product. The melting method of high aluminum non-magnetic steel can obviously reduce the melting cost.
Description
Technical field
The present invention relates to a kind of smelting process of high-alumina non-magnetic steel.
Background technology
High aluminium content nonmagnetic steel, manganese content are greater than 20%, and aluminium content has extremely low magnetic permeability, good mechanical and workability energy greater than 1.5%, and alternative austenitic stainless steel is used for making not magnetic conductive part of electrical equipments such as transformer, magnetic separator and motor.
The smelting process of existing high-alumina non-magnetic steel is: electrosmelting, intermediate frequency furnace deposite metal manganese behind the electric furnace steel tapping, is blended into molten metal manganese liquid in the ladle, mixes evenly by force through VD, heats up at the LF stove, fine setting composition, cast then.But this method smelting procedure cost is higher.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing high-alumina non-magnetic steel smelting process, the invention provides the smelting process of the low high-alumina non-magnetic steel of a kind of cost.
Design of the present invention is to smelt with combined blown converter, substitutes now to smelt with electric furnace and intermediate frequency furnace duplex, not only can reduce by 50% smelting procedure cost, and steel is also pure.
The step of this high-alumina non-magnetic steel smelting process comprises preprocessed molten iron, combined blown converter smelting, VD refining and the refining of LF stove, and the feature of its key step is:
The I combined blown converter is smelted
A is the following preprocessed molten iron combined blown converter of packing into the weight proportion of C, Si, P, S in the molten iron and temperature, and Intake Quantity is 76%～77% of a target molten steel amount.
C：3.80～4.10％ Si：≤0.01％ Mn：0.03～0.10％ P：0.002～0.015％S：0.010～0.035％ T：1230～1300℃。
The b molten iron is blended into converter, and grate, is smelted the whole process bottom blowing and selected argon gas for use apart from metal bath surface 2.0～3.0m oxygen decarburization, intensification to zero-bit, and molten iron per ton adds lime 45-70Kg, magnesium ball 20-30Kg, fluorite 3-10Kg in blowing, adds manganese metal and ferro-aluminum afterwards.
C manganese metal and ferro-aluminum add with hopper or high hopper in three batches, and 30～36%, three batches of ferro-aluminum add-ons that the every batch of manganese metal add-on is total add-on are respectively 25～30%, 25～30% and 40～50% of the total add-on of ferro-aluminum.
D manganese metal and ferro-aluminum adding method divided for three steps carried out:
The first step: rifle is carried in oxygen blast to 75～80% o'clock of total oxygen consumption, with hopper or high hopper first manganese metal and ferro-aluminum are added in the combined blown converter, grate is to zero-bit, and argon bottom-blowing stirs 2～3min, fall the oxygen rifle apart from metal bath surface 2.0～3.0m oxygen blast, the oxygen consumption is 6～8% of total oxygen consumption;
Second step: after mentioning the oxygen rifle, add second batch of manganese metal and ferro-aluminum with hopper or high hopper, stove is shaken zero-bit, argon bottom-blowing stirs 2～3min, falls the oxygen rifle apart from metal bath surface 2.0～3.0m oxygen blast, and the oxygen consumption is 6%～8% of total oxygen consumption;
The 3rd step: after mentioning the oxygen rifle, add the 3rd manganese metal and ferro-aluminum with hopper or high hopper, stove is shaken zero-bit, argon bottom-blowing stirs 2～3min, the oxygen rifle falls apart from metal bath surface 2.0～3.0m oxygen blast, the oxygen consumption is mentioned the oxygen rifle then for 8%～9% of total oxygen consumption, and argon bottom-blowing stirs 5～8min tapping.
In e when tapping, add aluminium or other alloy in ladle, as vanadium iron etc., the recovery rate of aluminium is 90%～96%, and the recovery rate of other alloy is 95%～100%.
II VD stove refining procedure
A skims before entering the station.
The B condition of arriving at a station: temperature 〉=1550 ℃, slag is thick≤50mm, headroom 〉=1250mm.
C opens argon bottom-blowing after vacuumizing 3min, adds lime 7～12Kg/t, fluorite 2～4Kg/t, and under vacuum tightness 20～30mbar condition, the argon bottom-blowing flow is opened to 400～600L/min stirring, 15～25min; During end, earlier the steel ladle bottom argon blowing air to close is closed, treat to break sky after the steel face calmness.
III furnaceman LF preface
A enter the station residue adjustment (adding aluminium powder 0.35-0.65Kg/t), heat up, temperature rises to 1485 ℃～1505 ℃, feeds CaSi line 2～3m/t (the Si recovery rate is calculated by 95～100%); The argon bottom-blowing flow is to stir a little less than 60～100L/min, weak churning time 〉=15min, a little less than must not make when stirring molten steel exposed; Calm 5～10min before the departures.
The proportionately product target control of b departures composition.
The c out-station temperature is controlled at 1475 ℃～1495 ℃.
Present method is to make main raw material with molten iron to smelt high-alumina non-magnetic steel with combined blown converter, substitute now and smelt with electric furnace and intermediate frequency furnace duplex, not only can obviously reduce smelting cost, generally can reduce by 50% smelting procedure cost, and steel is pure, harmful elements Pb, Sn, As, Sb and Bi are all below 0.01% in the steel, and other residual element are also very low.With the transformer magnetic isolation board that this high-alumina non-magnetic steel is made, magneticstrength 16 * 10
3The magnetic permeability of peace/rice≤1.05 * 4 л * 10
-7Henry/rice.
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.
Present embodiment carries out on 90 tons of combined blown converters, and rifle at the bottom of 5 circular seam types is equipped with in this converter bottom, and gas supply flow of the maximum end of converter is 53m
3/ min; Used ladle bottom is equipped with 2 bottom blow supplying settings, and gas supply flow of single end is 600L/min to the maximum.The steel grade that present embodiment is handled is 20Mn23AlV, and steel grade finished product composition sees Table-1.
Table-1
| Element | C％ | Si％ | Mn％ | P％ | S％ | Al％ | V％ |
| Standard | 0.14-0.20 | ≤0.50 | 21.50-25.00 | ≤ 0.030 | ≤ 0.030 | 1.50-2.50 | 0.04-0.10 |
This steel grade production process route: preprocessed molten iron → combined blown converter → VD → LF → continuous casting, combined blown converter is to produce indispensable link in this steel grade process, present embodiment only describes the combined blown converter smelting process, other operation operation according to a conventional method.Present embodiment combined blown converter operation steps is as follows:
The I combined blown converter is smelted
The 62.7t preprocessed molten iron is poured in the combined blown converter, and weight proportion and the temperature of the C of preprocessed molten iron, Si, Mn, P, S are respectively:
T:1260 ℃ of quantity of slag 1.3t of C:4.05% Si:0.01% Mn:0.05% P:0.009% S:0.023%, all the other are Fe and unavoidable impurities.
The oxygen rifle drops to 9.58m, and apart from metal bath surface 3.0m oxygen blast, oxygen flow is 10800m
3/ h, oxygen decarburization, intensification are smelted the whole process bottom blowing and are selected argon gas for use, and converting process adds lime 3.0t, magnesium ball 1.5t, fluorite 0.2t, adds manganese metal and ferro-aluminum afterwards.
Manganese metal and ferro-aluminum adding method divided for three steps carried out:
The first step: oxygen blast is to 2700m
3Mention oxygen rifle grate, thermometric is 1720 ℃, with hopper with the 7.8t manganese metal (manganese content: 96.9%) and the 0.5t ferro-aluminum (aluminium content: 37.7%) add together in the combined blown converter, grate is used 53m to zero-bit
3Stir 3min for argon flow amount at the bottom of the/min, fall the oxygen rifle then to 9.58m oxygen blast 253m
3, mention oxygen rifle grate, 1645 ℃ of thermometrics;
Second step: with hopper 7.0t manganese metal and 0.5t ferro-aluminum are added in the combined blown converter together, grate is used 53m to zero-bit again
3Stir 3min for argon flow amount at the bottom of the/min, fall the oxygen rifle then to 9.58m oxygen blast 260m
3, in stove, add ferrosilicon 0.2t simultaneously, mention oxygen rifle grate, 1631 ℃ of thermometrics;
The 3rd step: with hopper 7.0t manganese metal and 0.8t ferro-aluminum are added in the stove together, grate is used 53m to zero-bit again
3Stir 3min for argon flow amount at the bottom of the/min, fall the oxygen rifle then to 9.58m oxygen blast 292m
3, in combined blown converter, add ferrosilicon 0.1t simultaneously, carry the rifle grate, 1606 ℃ of thermometrics, grate is used 53m to zero-bit
3Tap after supplying argon flow amount to stir 8min at the bottom of the/min.
Tapping go to add in the ladle aluminum shot 2.0t (aluminium content: 99%), vanadium iron 0.095t (content of vanadium: 53.2%), tapping time 2.5min, the back temperature of coming out of the stove is 1583 ℃, molten steel amount 82t, oxygen consumption is 3505m
3, smelting cycle is 57min, the thick 100mm of slag.
II VD refining
After skimming, ladle is put in the VD tank car, drives tank car and handle the position to VD with overhead traveling crane.The composition weight proportion of 1556 ℃ of liquid steel temperatures, the thick 30mm of slag, headroom 1350mm, molten steel of arriving at a station is:
C0.17％ Si0.12％ Mn23.48％ P0.012％ S0.005％
Al2.25% V0.06%, all the other are Fe and unavoidable impurities.
2.1 open argon bottom-blowing after vacuumizing 3min, add lime 0.75t, fluorite 0.2t; Under vacuum tightness 20-30mbar, two BOTTOM ARGON BLOWING of ladle, flow is all opened to 500L/min, stirs 20min.
2.2 before the vacuum breaker, close the ladle bottom blowing argon gas, vacuum breaker after the molten steel face calmness, 1457 ℃ of liquid steel temperatures are handled cycle 43min, and the composition weight proportion of departures molten steel is:
C0.17％ Si0.22％ Mn23.47％ P0.012％ S0.001％
Al2.06% V0.06%, all the other are Fe and unavoidable impurities.
III LF stove refining procedure
The molten steel residue adjustment of entering the station adds aluminium powder 30Kg, is warming up to 1490 ℃, feed CaSi line 230m (Φ 13mm, Si:57%), argon bottom-blowing afterwards, flow is to stir a little less than the 100L/min, weak stirring 16min, calm 8min, out-station temperature is 1483 ℃, the composition weight proportion of departures molten steel is:
C0.17％ Si0.29％ Mn23.48％ P0.012％
All the other are Fe and unavoidable impurities for S0.001% Al1.95% V0.06%.
Claims (1)
1. the smelting process of a high-alumina non-magnetic steel, it comprises, and preprocessed molten iron, combined blown converter are smelted, VD refining and the refining of LF stove, and the feature of its key step is:
The I combined blown converter is smelted
A is the following preprocessed molten iron combined blown converter of packing into the weight proportion of C, Si, P, S in the molten iron and temperature, and Intake Quantity is 76%～77% of a target molten steel amount;
C：3.80～4.10％Si：≤0.01％Mn：0.03～0.10％P：0.002～0.015％
S：0.010～0.035％T：1230～1300℃。
The b bottom blowing is omnidistance for argon
C manganese metal and ferro-aluminum divide 3 batches to add with hopper or high hopper, and 30～36%, 3 batches of ferro-aluminum add-ons that the every batch of manganese metal add-on is total add-on are respectively 25～30%, 25～30% and 40～50% of the total add-on of ferro-aluminum;
D manganese metal and ferro-aluminum adding method divided for three steps carried out
The first step
Rifle is carried in oxygen blast to 75～80% o'clock of total oxygen consumption, with hopper or high hopper the 1st batch of manganese metal and ferro-aluminum are added in the combined blown converter, grate is to zero-bit, and argon bottom-blowing stirs 2～3min, fall the oxygen rifle apart from metal bath surface 2.0～3.0m oxygen blast, the oxygen consumption is 6～8% of total oxygen consumption;
Second step
Add the 2nd batch of manganese metal and ferro-aluminum with hopper or high hopper after mentioning the oxygen rifle, stove is shaken zero-bit, argon bottom-blowing stirs 2～3min, falls the oxygen rifle apart from metal bath surface 2.0～3.0m oxygen blast, and the oxygen consumption is 6～8% of total oxygen consumption;
The 3rd step
Add the 3rd batch of manganese metal and ferro-aluminum with hopper or high hopper after mentioning the oxygen rifle, stove is shaken zero-bit, argon bottom-blowing stirs 2～3min, the oxygen rifle falls apart from metal bath surface 2.0～3.0m oxygen blast, the oxygen consumption is mentioned the oxygen rifle then for 8～9% of total oxygen consumption, and argon bottom-blowing stirs 5～8min tapping;
The e tapping
During tapping, add aluminium or other alloy in ladle, the recovery rate of aluminium is 90%～96%, and other yield of alloy is 95%～100%;
II VD stove refining procedure
A skims before entering the station
The b condition of arriving at a station: temperature 〉=1550 ℃, slag is thick≤50mm, headroom 〉=1250mm;
C opens argon bottom-blowing after vacuumizing 3min, adds lime 7～12Kg/t, fluorite 2～4Kg/t, and under vacuum tightness 20～30mbar condition, the argon bottom-blowing flow is opened to 400～600L/min stirring, 15～25min; During end, earlier the steel ladle bottom argon blowing air to close is closed, treat to break sky after the steel face calmness;
III furnaceman LF preface
The a residue adjustment of entering the station adds aluminium powder 0.35-0.65Kg/t, intensification, and temperature rises to 1485～1505 ℃, feeds CaSi line 2～3m/t; The argon bottom-blowing flow is to stir a little less than 60～100L/min, weak churning time 〉=15min, a little less than must not make when stirring molten steel exposed; Calm 5～10min before the departures;
The proportionately product target control of b departures composition;
The c out-station temperature is 1475～1495 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100795357A CN101376915B (en) | 2008-09-29 | 2008-09-29 | Method for smelting high-alumina non-magnetic steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100795357A CN101376915B (en) | 2008-09-29 | 2008-09-29 | Method for smelting high-alumina non-magnetic steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101376915A CN101376915A (en) | 2009-03-04 |
| CN101376915B true CN101376915B (en) | 2010-11-03 |
Family
ID=40420654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100795357A Expired - Fee Related CN101376915B (en) | 2008-09-29 | 2008-09-29 | Method for smelting high-alumina non-magnetic steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101376915B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736122B (en) * | 2010-01-12 | 2011-07-20 | 山西太钢不锈钢股份有限公司 | Method for improving recovery rate of smelt nonmagnetic steel aluminum |
| CN102051439B (en) * | 2010-12-30 | 2012-12-05 | 本钢板材股份有限公司 | Method for smelting high aluminium steel |
| CN103014537B (en) * | 2011-09-21 | 2014-12-24 | 山西太钢不锈钢股份有限公司 | Smelting method of steel used in high speed passenger train hollow axle |
| CN103397141B (en) * | 2013-07-30 | 2014-12-24 | 山西太钢不锈钢股份有限公司 | Smelting method of high-aluminum stainless steel |
| CN103741023B (en) * | 2014-01-02 | 2015-09-23 | 山西太钢不锈钢股份有限公司 | A kind of smelting process of nonmagnetic steel |
| CN104164606B (en) * | 2014-08-08 | 2016-03-30 | 东北大学 | A kind of smelt iron Ohmax adds the method for aluminium |
| CN105986063A (en) * | 2015-02-13 | 2016-10-05 | 鞍钢股份有限公司 | Method for producing cold-rolled sheet SPHD through VD |
| CN105177215B (en) * | 2015-08-28 | 2017-03-22 | 常州东大中天钢铁研究院有限公司 | Efficient production process of high aluminum-alloy-content structure round steel |
| CN105903916A (en) * | 2016-06-23 | 2016-08-31 | 江阴兴澄特种钢铁有限公司 | Continuous casting method for producing non-magnetic steel on straight-arc-shaped continuous casting machine |
| CN108796383A (en) * | 2017-04-27 | 2018-11-13 | 宝山钢铁股份有限公司 | A kind of titaniferous high-intensity and high-tenacity nonmagnetic steel and its manufacturing method |
| CN114427014B (en) * | 2022-01-18 | 2023-02-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Smelting method of high-manganese non-magnetic steel |
-
2008
- 2008-09-29 CN CN2008100795357A patent/CN101376915B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101376915A (en) | 2009-03-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101376915B (en) | Method for smelting high-alumina non-magnetic steel | |
| CN106636953B (en) | A kind of effective martensitic stain less steel P91 smelting processes of boiler | |
| CN102260822B (en) | Smelting method of high-phosphorus low-sulfur non-oriented electrical steel | |
| CN102952923B (en) | Process for smelting aluminum containing steel through calcium carbide deoxidation | |
| CN101993973B (en) | Method for producing high-purity pure iron | |
| CN105821330B (en) | A kind of martensitic stain less steel and smelting process | |
| CN102199682B (en) | Semisteel steelmaking method | |
| CN107287502A (en) | A kind of nitrogenous steel smelting process | |
| CN103468874A (en) | Method for manufacturing low-carbon TWIP steel through AOD (argon oxygen decarburization) furnace | |
| CN101979672A (en) | Method for ultra-deeply dephosphorizing in steel ladle | |
| CN103468866B (en) | Refining technology for molten medium-high carbon steel | |
| CN104451385A (en) | Low-carbon low-nitrogen and high-oxygen industrial pure iron and production method thereof | |
| CN101671763A (en) | Method for increasing nitrogen for smelting high nitrogen stainless steel in argon oxygen decarburizing furnace | |
| CN110512044A (en) | A kind of smelting process of high-purity pig iron | |
| CN103642966B (en) | Method for improving high-carbon high-manganese steel converter smelting endpoint carbon content and steelmaking method | |
| CN106893946A (en) | Using the low-carbon (LC) austenitic stainless steel including molybdenum and its production technology of smelting laterite-nickel ores | |
| CN103484599B (en) | Smelting method of high-manganese wear-resistant steel | |
| CN102230121A (en) | Refining method of T91 heat-resistant steel tube blank | |
| CN102453786B (en) | Method for smelting steel for drill rod joint by using rotating furnace, and steel for drill rod joint | |
| Hüsken et al. | Use of hot metal with high phosphorous content in combined blowing BOF converters | |
| CN101586174B (en) | Steel two-slag purifying method for ultra-cleaning welding | |
| CN103397141A (en) | Smelting method of high-aluminum stainless steel | |
| CN102634634A (en) | Method for producing high-alloy low-phosphorous steel used for boiler tube by adopting electric-arc furnace | |
| CN109136467A (en) | Silicon killed steel makes the control method of boron content in acid slag refining process | |
| CN103540712A (en) | Nitrogen increasing method of low-carbon high-nitrogen stainless steel ladle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20170929 |