CN105803156B - A kind of oxide control method for improving magnesium recovery rate - Google Patents
A kind of oxide control method for improving magnesium recovery rate Download PDFInfo
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- CN105803156B CN105803156B CN201610178135.6A CN201610178135A CN105803156B CN 105803156 B CN105803156 B CN 105803156B CN 201610178135 A CN201610178135 A CN 201610178135A CN 105803156 B CN105803156 B CN 105803156B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/116—Refining the metal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
Abstract
The present invention discloses a kind of oxide control method for improving magnesium recovery rate, belongs to steelmaking technical field.In the inventive method, Ti Fe alloy claded wires addition alloying element Ti is fed into ladle in RH stations, after ladle is hung to panoramic table, the free oxygen content in molten steel is controlled in the range of 10 18ppm, superheat of liquid steel is 20 30 DEG C, Ni Mg alloy claded wires addition alloying element Mg is fed into ladle in continuous casting station, and with the soft stirring 3min of 0.4MPa pressure.Using this method, alloying element Mg recovery rates can be stablized 15 30%, oxide in obtained slab is based on Mg Ti series composite oxides, the oxide of wherein size≤2.0 μm account for all above-mentioned oxides ratio reach 83% and more than, the bulk density of the oxide of size≤2.0 μm reaches 3.7 × 105Individual/mm3More than and.
Description
Technical field
The invention belongs to technical field of steel production, and in particular to add titanium, magnesium during one kind steel-making, improve magnesium recovery rate
Oxide control method.
Background technology
At present, high heat-input steel plate for welding obtains in multiple fields such as ship, building, pressure vessel, pipeline, ocean platforms
Extensive use is arrived.According to measuring and calculating, using high heat-input welding method, welding efficiency can even improve 5 times and more than, manufacture work
When be greatly decreased, cost declines to a great extent.
Oxides Metallurgy Technology is the effective ways for manufacturing high heat-input welding steel, and this method important requirement oxide is protected
Hold below certain size, induce intragranular acicular ferrite forming core using tiny oxide, it is brilliant to refine original austenite indirectly
Particle size, so as to obtain higher Low Temperature Impact Toughness of Heat-affected Zone.Wherein, the Mg of small size and Dispersed precipitate oxide grain
Son can fully ensure that the effect of Oxide Metallurgy, improve high heat-input plate property, and the type oxide in smelting process
Control technology is in key position.
Patent CN 102373371 A, CN 102191356 A, CN 102296147 A add using in ingot mould bottom
The mode of Ni-Mg alloys adds Mg alloys, only molds and produces suitable for small lot, and production efficiency is low, is not suitable for industrial mass
Measure direct casting.
The A of patent CN 103215507 are proposed, Ti-Fe lines, Al lines, Ni-Mg lines, Ca lines are added sequentially in RH stations and is entered
Row deoxidation and alloying.On the one hand, the deoxygenated alloy being largely continuously added to, which makes control molten steel splash, turns into problem, on the other hand,
Addition opportunity is partially early, and Mg burning loss of alloy is more, and recovery rate is low, it is impossible to the content of Mg in steel plate is effectively ensured.
The A of patent CN 103938065 to compound addition Ti, Mg by the way of tundish line feeding using carrying out alloying.First,
Whether this method does not refer to line feeding process with casting process while carrying out, if carry out simultaneously, Ti, Mg alloy in Metal in Tundish
Uniformity is difficult to ensure that oxide uniformity is poor, if non-concurrent progress, this method can not be by direct casting come a large amount of raw
Produce steel plate；Secondly, this method uses the B alloy wire and Mg-Y-Ni B alloy wires of Ti weight/mass percentage composition >=95%, high expensive；Most
Afterwards, this method adds two kinds of oxidizable elements simultaneously, it is desirable to and steelmaking equipment is more complicated, is unfavorable for operating and controls molten steel to splash,
The recovery rate of final magnesium is only 8-15%.
The A of patent CN 103757178 carry out the compound conjunction of Ti, Mg using a kind of steel-making additive for improving high heat-input performance
Aurification.This method according to a certain ratio mixes raw material, through vacuum smelting furnace melting and casting ingot-forming, is then ground into ingot casting
Simultaneously core-spun yarn is made in alloy powder.This method operating process is cumbersome, and cost is higher, and just the operating process of addition alloy is not given
It is described in detail.
The content of the invention
It is an object of the invention to provide a kind of oxide control method for improving magnesium recovery rate, suitable for live converter or electricity
Just refining, ladle refining, continuous casting flow, this method are carried out Ti, Mg alloying in steel-making, can ensured stove by way of line feeding
Alloying element Mg recovery rate is stable, and a large amount of tiny Mg-Ti type composite oxides can be formed in slab, ensures oxygen
Compound metallurgical effect.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of oxide control method for improving magnesium recovery rate, LF refining stage：Free oxygen scope exists in molten steel during tapping
20-30ppm；The RH stages：Net circulation time 5-10min, the degree of superheat is 55-75 DEG C after molten steel breaks sky, and Ti-Fe is fed into ladle
Alloy claded wire, then use the 0.4-0.6MPa soft stirring molten steel of pressure argon bottom-blowing, time >=5min；The continuous casting stage：Steel
After bag is hung to panoramic table, the free oxygen scope of molten steel is in 10-18ppm in ladle；Superheat of liquid steel is 20-30 DEG C, before continuous casting to
Ni-Mg alloy claded wires are fed in ladle, using the soft stirring 3min of 0.4MPa pressure, subsequent ladle beam into tundish.
Further, Ti-Fe alloy core-spun yarn wire-feeding velocity is in the oxide control method of described raising magnesium recovery rate
4-6m/s, Ti alloy contents are 25% in core powder；Ni-Mg alloy claded wires wire-feeding velocity is 7-10m/s, cored core Powder Particle Size
For 0.5-2.0mm, the Mg alloys containing part by weight 2-18% in alloy core powder.
1) the LF refining stage, ensure that the free oxygen content of molten steel is 20-30ppm by deoxidation control, ensure the freedom of molten steel
Oxygen content is in 10-18ppm.
2) RH refining stages, by 5-10min net circulation, the N in molten steel is sloughed2, H2Deng gas, and promote bulky grain
Inclusion floating, cleaning molten steel.
3) RH refining stages, the degree of superheat is 55-75 DEG C after controlling molten steel broken empty, ensure ladle enter panoramic table after, even
Molten steel temperature is at 20-30 DEG C before casting, while avoids that temperature is too high, waste of energy, and Ti recovery rate is low, and subsequent production rhythm is difficult
The problems such as to adjust.
4) RH refining stages, feed Ti-Fe alloy core-spun yarn, and alloying element Ti can be combined generation with O, N in molten steel
Tiny TiOxWith TiN particles, reach the metallurgical effect of partial oxide.In addition Ti and O binding ability is less than Mg and O knot
Conjunction ability, Ti and oxygen combine in molten steel, the part oxygen fought in advance in molten steel, oxygen in molten steel when preventing from subsequently feeding Mg alloy wires
Too high levels, advantage is provided for the formation of the oxide containing Mg, reduces alloying element Mg scaling loss.
5) RH refining stages, more than 5min is stirred with 0.4-0.6MPa pressure, large inclusionses float in molten steel, protect
The degree of purity of molten steel is demonstrate,proved, adds liquid level coverture insulation molten steel afterwards.
4) the continuous casting stage, if molten steel oxygen content before continuous casting station is entered is higher than 18ppm, Ni-Mg alloy claded wires are added
Afterwards, by the larger oxide of generating portion particle diameter in molten steel, if this partial oxide can float, it will cause Mg recovery rate mistake
It is low, if this partial oxide is stayed in molten steel because can not fully float, the cleannes of molten steel will certainly be influenceed, deteriorate steel machine
Tool performance.If the oxygen content in molten steel is less than 10ppm, it is unfavorable for generating sufficient amount of tiny Mg-Ti in molten steel compound
Oxide particle, influence to carry out metallurgical effect using a large amount of fine oxides.
5) the continuous casting stage, superheat of liquid steel is when between 20-30 DEG C, with the quick line feeding of 7-10m/s speed, when avoiding long
Between wait and easily cause oxide floating, in steel the problems such as Mg easy scaling loss；Secondly, core-spun yarn granularity is maintained at 0.5-2.0mm, small
High, the oxide grain that the alloying pellet more than 2.0mm easily forms aggregation, that size is bigger than normal in 0.5mm alloying pellet burn out rate
Son；Again, Mg alloy contents between 2-18%, prevent that high Mg alloy content ratios from causing recovery rate too low and steel in core powder
The problem of liquid splashes.The binding ability of Mg elements and O elements is strong, and it is multiple that a large amount of tiny Mg-Ti series can be formed in molten steel
Close oxide.
6) the continuous casting stage, if RH stations add Ni-Mg alloy claded wires, superheat of liquid steel is higher, in addition by it is long when
Between the influence that stops, scaling loss easily occurs in molten steel or generates granularity oxide bigger than normal Mg, and recovery rate can be greatly reduced, this
Outside, during steel-making, a variety of deoxidations and alloy element need to be added in the RH stages, the possibility that molten steel splashes is larger.In order to carry
High Mg recovery rate and the security of operation, the present invention feed Ni-Mg alloy claded wires into ladle using in continuous casting station.
7) the continuous casting stage, using the soft stirring 3min of 0.4MPa pressure, the uniformity of Mg in molten steel is ensured, through said process
The Mg-Ti series composite oxides of formation, tundish and crystallizer are sequentially flowed into the progress of casting process, it is a large amount of tiny
Mg-Ti series composite oxides are preserved in solid-state slab.
Compared with prior art, the present invention at least has the advantages that：
The present invention passes through in refining and continuous casting stage, accurately controlling oxygen content and superheat of liquid steel, accurate assurance line feeding
Machine, rationally controlling the means such as line feeding process to complete, Ti, Mg are element alloyed, ensure that alloying element Mg recovery rate is stable in 17-
21%, improve alloy utilization rate, reduce cost of alloy, and in slab size at 2.0 μm and following Mg-Ti series composite oxygens
Compound account for all oxides 83% and more than, the bulk density of 2.0 μm and following Mg-Ti series composite oxides reaches
3.7×105Individual/mm2, ensure the effect of Oxide Metallurgy.
Embodiment
The present invention is described in further detail with reference to embodiment.
Embodiment 1
When LF refining station is tapped, molten steel oxygen content 21ppm.Molten steel follows only after the vacuum outgas of RH stations and alloying
Ring 5min, superheat of liquid steel is 72 DEG C after breaking sky, feeds Ti-Fe alloy core-spun yarn with 5m/s speed, Ti alloys contain in core powder
Measure as 25%；With the soft stirring 6min of 0.6MPa bottom blowing pressure, before ladle hangs RH stations, liquid level adds Ultra-low carbon carbonization rice husk
Insulation.Into continuous casting station, superheat of liquid steel is 28 DEG C, and the content of free oxygen is 10ppm, and Ni-Mg is fed with 7m/s speed
Alloy claded wire 425m, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder, are adopted
With the soft stirring 3min of 0.4MPa pressure, subsequent ladle is to tundish beam, into continuous casting working procedure.
Embodiment 2
When LF refining station is tapped, molten steel oxygen content 26ppm.Molten steel follows only after the vacuum outgas of RH stations and alloying
Ring 7min, superheat of liquid steel is 68 DEG C after breaking sky, feeds Ti-Fe alloy core-spun yarn with 5m/s speed, Ti alloys contain in core powder
Measure as 25%；With the soft stirring 7min of 0.5MPa bottom blowing pressure, before ladle hangs RH stations, liquid level adds Ultra-low carbon carbonization rice husk
Insulation.Into continuous casting station, superheat of liquid steel is 26 DEG C, and the content of free oxygen is 17ppm, and Ni-Mg is fed with 9m/s speed
Alloy claded wire 409m, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder, are adopted
With the soft stirring 3min of 0.4MPa pressure, subsequent ladle is to tundish beam, into continuous casting working procedure.
Embodiment 3
When LF refining station is tapped, molten steel oxygen content 29ppm.Molten steel follows only after the vacuum outgas of RH stations and alloying
Ring 8min, superheat of liquid steel is 57 DEG C after breaking sky, feeds Ti-Fe alloy core-spun yarn with 5m/s speed, Ti alloys contain in core powder
Measure as 25%；With the soft stirring 9min of 0.4MPa bottom blowing pressure, before ladle hangs RH stations, liquid level adds Ultra-low carbon carbonization rice husk
Insulation.Into continuous casting station, superheat of liquid steel is 21 DEG C, and the content of free oxygen is 20ppm, and Ni-Mg is fed with 10m/s speed
Alloy claded wire 412m, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder, are adopted
With the soft stirring 3min of 0.4MPa pressure, subsequent ladle is to tundish beam, into continuous casting working procedure.
Comparative example 1
When LF refining station is tapped, molten steel oxygen content 48ppm.Molten steel follows only after the vacuum outgas of RH stations and alloying
Ring 5min, superheat of liquid steel is 73 DEG C after breaking sky.Ti-Fe alloy core-spun yarn is fed with 5m/s speed, Ti alloys contain in core powder
Measure as 25%；With the soft stirring 5min of 0.6MPa bottom blowing pressure.Before ladle hangs RH stations, liquid level adds Ultra-low carbon carbonization rice husk
Insulation.Into continuous casting station, superheat of liquid steel is 26 DEG C, and the content of free oxygen is 26ppm, and Ni-Mg is fed with 7m/s speed
Alloy claded wire 407m, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder, are adopted
With the soft stirring 3min of 0.4MPa pressure, subsequent ladle is to tundish beam, into continuous casting working procedure.
Comparative example 2
When LF refining station is tapped, molten steel oxygen content 28ppm.Molten steel follows only after the vacuum outgas of RH stations and alloying
Ring 5min, superheat of liquid steel is 50 DEG C after breaking sky.Ti-Fe alloy core-spun yarn is fed with 5m/s speed, Ti alloys contain in core powder
Measure as 25%；With the soft stirring 8min of 0.5MPa bottom blowing pressure.Before ladle hangs RH stations, liquid level adds Ultra-low carbon carbonization rice husk
Insulation.Into continuous casting station, superheat of liquid steel is 15 DEG C, and the content of free oxygen is 15ppm, and Ni-Mg is fed with 9m/s speed
Alloy claded wire 410m, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder, are adopted
With the soft stirring 3min of 0.4MPa pressure, subsequent ladle is to tundish beam, into continuous casting working procedure.
Comparative example 3
When LF refining station is tapped, molten steel oxygen content 29ppm.Molten steel follows only after the vacuum outgas of RH stations and alloying
Ring 4min, superheat of liquid steel is 63 DEG C after breaking sky.Ti-Fe alloy core-spun yarn is fed with 3m/s speed, Ti alloys contain in core powder
Measure as 25%；With the soft stirring 4min of 0.3MPa bottom blowing pressure.Before ladle hangs RH stations, liquid level adds Ultra-low carbon carbonization rice husk
Insulation.Into continuous casting station, superheat of liquid steel is 22 DEG C, and the content of free oxygen is 18ppm, and Ni- is fed with 0.5m/s speed
Mg alloy claded wire 417m, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder.
Subsequent ladle is to tundish beam, into continuous casting working procedure.
Cut deal slab is produced into using embodiment 1-3 and the continuous casting process of comparative example 1-3 respectively.
Sampled respectively in embodiment 1-3 and comparative example 1-3 steel plates, detect chemical composition.The experimental result such as institute of table 1
Show.Embodiment 1-3 alloying elements Mg recovery rate is 17.3-28.5%, average 21.7%, comparative example 1-3 alloying elements
Mg recovery rate is only 7.1-10.2%, and average 8.4%.
The embodiment 1-3 of table 1 and the chemical composition (wt, %) of comparative example 1-3 steel plates and Mg recovery rate (%)
For embodiment 1-3 and comparative example 1-3, sampled respectively on slab, carry out field trash statistical analysis, analysis
As a result it is as shown in table 2.In embodiment 1-3, size is in 2.0 μm and following oxide ratios in 83-87%, and size is at 2.0 μm
And following oxidation surface density is 3.7 × 105Individual/mm3More than and.In comparative example 1-3, size is at 2.0 μm and following
Oxide ratios are in 65-74%, and size is at 2.0 μm and following oxidation surface density is more than 1.9 × 105Individual/mm2。
The embodiment 1-3 of table 2 and oxide ratios and density in comparative example 1-3 slabs
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (2)
- A kind of 1. oxide control method for improving magnesium recovery rate, it is characterised in that LF refining stage：During tapping in molten steel freely Oxygen scope is in 20-30ppm；The RH stages：Net circulation time 5-10min, the degree of superheat is 55-75 DEG C after molten steel breaks sky, into ladle Ti-Fe alloy core-spun yarn is fed, then uses the 0.4-0.6MPa soft stirring molten steel of pressure argon bottom-blowing, time >=5min；Even The casting stage：After ladle is hung to panoramic table, the free oxygen scope of molten steel is in 10-18ppm in ladle；Superheat of liquid steel is 20-30 DEG C, Ni-Mg alloy claded wires are fed before continuous casting into ladle, and with the soft stirring 3min of 0.4MPa pressure, subsequent ladle is to tundish Middle beam.
- 2. the oxide control method according to claim 1 for improving magnesium recovery rate, it is characterised in that described Ti-Fe Alloy claded wire wire-feeding velocity is 4-6m/s, and Ti alloy contents are 25% in core powder；Ni-Mg alloy claded wires wire-feeding velocity is 7- 10m/s, cored core Powder Particle Size are 0.5-2.0mm, the Mg containing part by weight 2-18% in alloy core powder.
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| CN107552746B (en) * | 2017-08-31 | 2020-04-07 | 赣州鼎洋贸易有限公司 | Molten steel heat-insulating agent and heat-insulating agent layer thereof |
| CN110117694B (en) * | 2019-04-09 | 2021-06-04 | 上海大学 | Magnesium adding process for magnesium-containing free-cutting steel |
| CN112296287A (en) * | 2020-09-27 | 2021-02-02 | 甘肃酒钢集团宏兴钢铁股份有限公司 | High-carbon steel inclusion control method |
| CN113913673B (en) * | 2021-09-27 | 2022-08-23 | 武汉钢铁有限公司 | Method for controlling size and quantity of inclusions in steel by magnesium-containing alloy |
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| CN1396960A (en) * | 2000-01-31 | 2003-02-12 | 埃尔凯姆公司 | Method for grain refining of steel, grain refining alloy for steel and method for producing grain refining alloy |
| CN102634640A (en) * | 2012-05-10 | 2012-08-15 | 江苏省沙钢钢铁研究院有限公司 | Nickel-magnesium alloy cored wire for final deoxidation of low-carbon molten steel |
| CN103215507A (en) * | 2013-04-18 | 2013-07-24 | 湖南华菱湘潭钢铁有限公司 | Steel plate smelting method for improving high heat input welding performance |
| CN105256095A (en) * | 2015-10-26 | 2016-01-20 | 江苏省沙钢钢铁研究院有限公司 | Method for smelting steel plate with excellent performance in high-heat-input-welding heat affected zone |
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|---|---|---|---|---|
| CN1396960A (en) * | 2000-01-31 | 2003-02-12 | 埃尔凯姆公司 | Method for grain refining of steel, grain refining alloy for steel and method for producing grain refining alloy |
| CN102634640A (en) * | 2012-05-10 | 2012-08-15 | 江苏省沙钢钢铁研究院有限公司 | Nickel-magnesium alloy cored wire for final deoxidation of low-carbon molten steel |
| CN103215507A (en) * | 2013-04-18 | 2013-07-24 | 湖南华菱湘潭钢铁有限公司 | Steel plate smelting method for improving high heat input welding performance |
| CN105256095A (en) * | 2015-10-26 | 2016-01-20 | 江苏省沙钢钢铁研究院有限公司 | Method for smelting steel plate with excellent performance in high-heat-input-welding heat affected zone |
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