CN105734419B - A kind of V, Ti micro alloyed steel and its smelting process and purposes - Google Patents
A kind of V, Ti micro alloyed steel and its smelting process and purposes Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C21C7/0025—Adding carbon material
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention belongs to field of iron and steel smelting, and in particular to a kind of V, Ti micro alloyed steel and its smelting process and purposes.Deoxidation material selects deoxidizing metals material more when prior art is made steel, deoxidation cost is high, the present invention provides a kind of smelting process that can reduce steel-making cost, including processing and continuous casting step outside pneumatic steelmaking, chain-wales stove, the pneumatic steelmaking stage uses new deoxidation alloying process, the outer processing stage control outbound oxygen activity≤50ppm of chain-wales of chain-wales stove, so as to produce V, Ti micro alloyed steel.Present invention saves deoxidizing metals materials'use amount while V, Ti microalloy are introduced, silicon, manganese addition is reduced, has saved cost, make steel the performance requirement that can meet construction(al)steel.
Description
Technical field
The invention belongs to field of iron and steel smelting, more particularly to a kind of V, Ti micro alloyed steel and its smelting process and purposes.
Background technology
Straight carbon steel is the main steel grade of China's steel and iron industry, is played an important role in the national economic development.According to system
Meter, ratio of the straight carbon steel steel plate in sheet material is more than 70%.One kind that construction(al)steel belongs in straight carbon steel, typically to steel plate
Intensity, toughness, plasticity requirements are not high, need to only meet the mechanical property in general straight carbon steel national standard GB/T700-2006 standards requirement
, yield strength >=235Mpa；Tensile strength 370-500Mpa；Elongation after fracture >=26%.
Some existing achievements in research in terms of domestic industrial production and products application to Q235 low-alloy high-tensile structural steels.
As document " Wu Hao letter ripples steel CSP lines Q235B thin plates performances and cost optimization [J] metal materials and metallurgical engineering, 2010,06,
34~38. ", the chemical composition of Q235 low-alloy high-tensile structural steels is adjusted according to self-condition, mainly to control
The element M n contents of hardness of steel are adjusted to 0.28~0.38%, and end properties fully meet national standard and user's needs, wine steel, Wuhan Iron and Steel Plant
Deng Mn contents in its Q235 low-alloy high-tensile structural steel generally more than 0.35%, each enterprise is in order to ensure Q235 low-alloy height
The intensity of strength structure hot rolled steel plate meets standard requirement, and main alloy element Mn contents are substantially controlled more than 0.35%
Higher level, cause production cost higher.
Prior art STEELMAKING PRODUCTION cost is high, and how to reduce influences big Si, Mn content to hardness of steel and make to make steel and reach
To the mechanical property of needs, there is critically important realistic meaning to saving production cost.
The content of the invention
In view of the above-mentioned problems of the prior art, the goal of the invention of the present invention be to provide a kind of V, Ti micro alloyed steel and
Its smelting process and purposes, this method can be produced with vanadium, the titanium micro-alloyed steel for climbing steel characteristic, by adding vanadium iron, ferrotianium
V, Ti microalloy are provided, so as to reduce silicon, manganese content, on the basis of meeting national standard to mechanical property requirements, greatly reduced
Steel-making cost, has a good economic benefit.
The invention solves first technical problem be to provide a kind of V, Ti micro alloyed steel, its composition is：By weight hundred
Divide than meter, C：0.20~0.25, Si：0.03~0.08, Mn：0.10~0.15, P：0~0.035, S：0~0.035, V：0.01
~0.05%, Ti：0.01~0.05%, Cr：0~0.03%, Ni：0~0.03%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, preferable composition are：Its composition is：C by weight percentage：0.21~
0.24、Si：0.04~0.07, Mn：0.11~0.14, P：0~0.025, S：0~0.025, V：0.02~0.04%, Ti：0.02
~0.04%, Cr：0~0.02%, Ni：0~0.02%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, is made by following smelting process, including is handled outside pneumatic steelmaking, chain-wales stove
And continuous casting step, the deoxidation alloying process in the pneumatic steelmaking stage are：Converter smelting molten steel endpoint carbon content≤0.04%
When, carbon dust, carburant progress pre-deoxidation are first added when molten steel is paved with ladle pot bottom, weight to be tapped accounts for the 1/3 of gross weight
When~1/2, carburant, double deoxidizer and silicomangan are sequentially added, after tapping terminates, adds vanadium iron, ferrotianium；Converter smelting
When making steel water endpoint carbon content ＞ 0.04%, carburant, compound is directly added into when weight of tapping accounts for the 1/3~1/2 of gross weight
Deoxidier and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；The outer processing stage control chain-wales of the chain-wales stove
Outbound oxygen activity≤50ppm.
The invention solves second technical problem be to provide a kind of smelting process of V, Ti micro alloyed steel, including converter
Processing and continuous casting step outside steel-making, chain-wales stove；
The deoxidation alloying process in the pneumatic steelmaking stage is：During converter smelting molten steel endpoint carbon content≤0.04%,
Carbon dust, carburant progress pre-deoxidation are first added when molten steel is paved with ladle pot bottom, weight to be tapped accounts for the 1/3~1/ of gross weight
When 2, carburant, double deoxidizer and silicomangan are sequentially added, after tapping terminates, adds vanadium iron, ferrotianium；Converter smelting steel
During water endpoint carbon content ＞ 0.04%, carburant, complex deoxidization are directly added into when weight of tapping accounts for the 1/3~1/2 of gross weight
Agent and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；
Outbound oxygen activity≤the 50ppm of the outer processing stage control chain-wales of the chain-wales stove.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the carbon dust addition is 0.15~0.30kg/t steel.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the addition of the carburant is：Carbon content≤0.04
When, carburant 0.2~0.5kg/t steel, second of addition carburant 2.1~2.8kg/t steel are added for the first time；Carbon content ＞
When 0.04%, carburant 2.2~2.6kg/t steel is added.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the double deoxidizer is CaC260~65wt%, Si
28~34wt% double deoxidizer, addition are 1.4~1.6kg/t steel.
Wherein, in the deoxidation alloying method of above-mentioned V, Ti micro alloyed steel, the double deoxidizer granularity is 15~20mm.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the silicomangan is Mn：60.0~67.0wt%, Si：
14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the vanadium iron addition is 0.7~0.95kg/t steel, institute
It is the vanadium iron that V content is 50% to state vanadium iron.
Wherein, in the smelting process of above-mentioned V, Ti micro alloyed steel, the ferrotianium addition is 1.2~1.45kg/t steel, institute
It is the ferrotianium that Ti contents are 30% to state ferrotianium.
The invention solves the 3rd technical problem be to provide a kind of purposes of above-mentioned V, Ti micro alloyed steel, for building
Industry and Guan Ye.
Beneficial effects of the present invention are：The present invention provides a kind of V, Ti micro alloyed steel and its deoxidation alloying method and use
On the way, this method is first carried out pre-deoxidation using carbon dust, is reduced deoxidizing metals material using the deoxidized alloying in steel making technique of low cost
The usage amount of material, it also avoid pollution of the deoxidizing metals product to molten steel；Meanwhile addition vanadium iron, ferrotianium are closed after deoxidation
Aurification processing, the addition of V, Ti microalloy reduce the addition of silicon, manganese, the cost of steel-making are greatly reduced, so as to produce
With vanadium, the titanium micro-alloyed steel for climbing steel characteristic, while cost is reduced, make steel and fully meet national standard GB/T 700-2006
Mechanical property requirements in standard, are primarily useful for construction industry and Guan Ye.
Embodiment
The present invention provides a kind of V, Ti micro alloyed steel, and its composition is：By weight percentage, C：0.20~0.25, Si：
0.03~0.08, Mn：0.10~0.15, P：0~0.035, S：0~0.035, V：0.01~0.05%, Ti：0.01~
0.05%, Cr：0~0.03%, Ni：0~0.03%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, preferable composition are：Its composition is：C by weight percentage：0.21~
0.24、Si：0.04~0.07, Mn：0.11~0.14, P：0~0.025, S：0~0.025, V：0.02~0.04%, Ti：0.02
~0.04%, Cr：0~0.02%, Ni：0~0.02%, surplus is Fe and inevitable impurity.
Wherein, above-mentioned V, Ti micro alloyed steel, is made by following smelting processes, including is handled outside pneumatic steelmaking, chain-wales stove
And continuous casting step, the deoxidation alloying process in the pneumatic steelmaking stage are：Converter smelting molten steel endpoint carbon content≤0.04%
When, carbon dust, carburant progress pre-deoxidation are first added when molten steel is paved with ladle pot bottom, weight to be tapped accounts for the 1/3 of gross weight
When~1/2, carburant, double deoxidizer and silicomangan are sequentially added, after tapping terminates, adds vanadium iron, ferrotianium；Converter smelting
When making steel water endpoint carbon content ＞ 0.04%, carburant, compound is directly added into when weight of tapping accounts for the 1/3~1/2 of gross weight
Deoxidier and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；The outer processing stage control chain-wales of the chain-wales stove
Outbound oxygen activity≤50ppm.
The present invention also provides a kind of smelting process of V, Ti micro alloyed steel, including handled outside pneumatic steelmaking, chain-wales stove and
Continuous casting step；
The deoxidation alloying process in the pneumatic steelmaking stage is：During converter smelting molten steel endpoint carbon content≤0.04%,
Carbon dust, carburant progress pre-deoxidation are first added when molten steel is paved with ladle pot bottom, weight to be tapped accounts for the 1/3~1/ of gross weight
When 2, carburant, double deoxidizer and silicomangan are sequentially added, after tapping terminates, adds vanadium iron, ferrotianium；Converter smelting steel
During water endpoint carbon content ＞ 0.04%, carburant, complex deoxidization are directly added into when weight of tapping accounts for the 1/3~1/2 of gross weight
Agent and silicomangan, after tapping terminates, add vanadium iron, ferrotianium；
Outbound oxygen activity≤the 50ppm of the outer processing stage control chain-wales of the chain-wales stove.
Wherein, in order to reach pre-deoxidation effect, when converter smelting molten steel endpoint carbon content≤0.04% first adds 0.15~
0.30kg/t steel carbon dusts, carbon dust are ink powder, are made up of resin and carbon black, electric charge agent, magnetic etc..The present invention is this using carbon dust
Nonmetallic deoxidation material carries out deoxidation, can significantly reduce the dosage of deoxidizing metals material, the deoxidation effectiveness of carbon dust and fine aluminium
Deoxidation effectiveness can convert by 1 ︰ 1, by promoting the use of converter carbon deoxidization technique, relative to original production straight carbon steel smelter
Skill, had both reduced the dosage of deoxidizing metals material, reduced pollution of the deoxidizing metals product to molten steel again.
In order to adjust smelting endpoint molten steel carbon content, when converter smelting molten steel endpoint carbon content≤0.04%, to add
Carburant twice, the carbon deoxidation for mainly playing carburant is added for the first time, is added to carburetting for the second time.Work as converter
During smelting molten steel endpoint carbon content ＞ 0.04%, a carburant can be directly added into, now carburant is mainly used in converter
Carburetting is to C：0.20~0.25% steel grade claimed range.Wherein, the addition of carburant is respectively：During carbon content≤0.04,
Carburant 0.2~0.5kg/t steel, second of addition carburant 2.1~2.8kg/t steel are added for the first time；Carbon content ＞ 0.04%
When, add carburant 2.2~2.6kg/t steel.
In order to preferably carry out deoxidation, cost-effective, the present invention adds double deoxidizer and carries out deoxidation simultaneously, reduces metal
The dosage of deoxidation material, reduce the quantity of field trash and reduce production cost；Preferable double deoxidizer composition is in the present invention：
CaC228~34wt% of 60~65wt%, Si, surplus Fe, addition are 1.4~1.6kg/t steel.Meanwhile the granularity of deoxidier
Size will have influence on deoxidation effect, and the granularity of deoxidier is limited in the range of 15~20mm in the present invention, can effectively be ensured
Deoxidation effect.
In order to obtain the steel of high intensity, it is necessary to add appropriate silicomangan, the present invention in due to the later stage add vanadium iron,
Ferrotianium, can effectively reduce the addition of silicomangan, and preferable silicomangan addition is 2.1~2.4kg/t steel, the silicomanganese
Alloy forms：By weight percentage, Mn：60.0~67.0%, Si：14.0~17.0%, C：≤ 2.5%, P：≤
0.2%, S：≤ 0.2%, surplus Fe.
Particularly, the present invention adds vanadium iron, ferrotianium steel-making, and vanadium iron addition is 0.7~0.95kg/t steel, preferably V content
For 50% vanadium iron, but it is not limited to V content limitation within this range, the addition of vanadium iron be adjusted according to the difference of V content；
Ferrotianium addition is 1.2~1.45kg/t steel, and preferably Ti contents are 30% ferrotianium, but is not limited to limit Ti contents in this model
In enclosing, the addition of ferrotianium is adjusted according to the difference of Ti contents.
Continuous casting is continuously casting, and molten steel is congealed into after duricrust from crystallizer constantly by water mold when being steel-making
Lower exit port is pulled straight, and through water-spraying control, the foundry technology process of blank is cut into after whole solidifications.The smelting process of the present invention
In, continuous casting is carried out using conventional continuous cast method.
Technical solution of the present invention is described further with reference to embodiment, but does not indicate that and protection domain is limited in reality
Apply in the range of example.
Product used is ordinary commercial products in embodiment.
Embodiment 1
120t pneumatic steelmakings, tap 133t.Smelting molten steel endpoint carbon content is 0.03%, and tapping process is paved with molten steel
Ladle pot bottom first adds 0.20kg/t steel carbon dust and 0.3kg/t steel carburant carries out pre-deoxidation, to treat carbon-oxygen in ladle
Reaction tends to that after calmness (about tapping 1/3~1/2), carburant, double deoxidizer and SiMn alloys are added according still further to order, its
Middle carburant adds 2.6kg/t steel, and double deoxidizer adds 1.5kg/t steel, and silicomanganese is quantitatively adding 2.2kg/t steel.Chain-wales go out
Stand oxygen activity 30ppm, FeTi30-A addition 1.36kg/t steel, FeV50-A addition 0.83kg/t steel.After chain-wales are outbound
Carry out continuous casting, composition of steel after finally becoming a useful person：C：0.23、Si：0.06、Mn：0.13、P：0.025、S：0.015、V：0.03%, Ti：
0.03%, Cr：0.015%, Ni：0.015%th, surplus is Fe and inevitable impurity.
Final performance：Yield strength：337MPa, tensile strength：427MPa, elongation after fracture：36%.Produced V, Ti are micro-
Steel alloy fully meets national standard and user's requirement.
Embodiment 2
120t pneumatic steelmakings, tap 135t.Smelting molten steel endpoint carbon content is 0.07%, and tapping process is treated in ladle
(about tapping 1/3~1/2) adds carburant, double deoxidizer and SiMn conjunctions in sequence after carbon-oxygen reaction tends to calmness
Gold, wherein carburant are accumulative to add 2.45kg/t steel, and double deoxidizer adds 1.4kg/t steel, and silicomanganese is quantitatively adding 2.1kg/t
Steel.Chain-wales outbound oxygen activity 28ppm, FeTi30-A addition 1.25kg/t steel, FeV50-A addition 0.75kg/t steel.It is small
Continuous casting, composition of steel after finally becoming a useful person are carried out after platform is outbound：C：0.21、Si：0.045、Mn：0.13、P：0.020、S：
0.014、V：0.02%, Ti：0.02%, Cr：0.014%, Ni：0.021%th, surplus is Fe and inevitable impurity.
Final performance：Yield strength：341MPa, tensile strength：432MPa, elongation after fracture：40%.Produced V, Ti are micro-
Steel alloy fully meets national standard and user's requirement.
Embodiment 3
120t pneumatic steelmakings, tap 134t.Smelting molten steel endpoint carbon content is 0.06%, and tapping process is treated in ladle
(about tapping 1/3~1/2) adds carburant, double deoxidizer and SiMn conjunctions in sequence after carbon-oxygen reaction tends to calmness
Gold, wherein carburant are accumulative to add 2.6kg/t steel, and double deoxidizer adds 1.6kg/t steel, and silicomanganese is quantitatively adding 2.35kg/t
Steel.Chain-wales outbound oxygen activity 34ppm, FeTi30-A addition 1.4kg/t steel, FeV50-A addition 0.9kg/t steel.It is small flat
Continuous casting, composition of steel after finally becoming a useful person are carried out after platform is outbound：C：0.23、Si：0.08、Mn：0.14、P：0.019、S：0.012、V：
0.035%, Ti：0.035%, Cr：0.016%, Ni：0.028%th, surplus is Fe and inevitable impurity.
Final performance：Yield strength：326MPa, tensile strength：441MPa, elongation after fracture：42%.Produced V, Ti are micro-
Steel alloy fully meets national standard and user's requirement.
From embodiment：The present invention provides V, Ti microalloy using vanadium iron, ferrotianium, and micro V, Ti are added in molten steel will
Part TiC, VC are formed, separates out small and dispersed particle in rolling and cooling procedure, TiC, VC of small and dispersed can effectively hinder
The wrong motion of stop bit, plays strong precipitation strength effect.Micro vanadium, titanium can make up reduces the intensity brought by manganese content
Influence, good mechanical property is maintained by the schedule of reinforcement ordinary carbon steel of vanadium titanium microalloying, both adds steel
Intensity, saved the addition of silicomangan again, so as to reduce production cost, the micro alloyed steel produced is in mechanical property
On meet national standard GB/T700-2006 requirement, be primarily useful in construction industry and Guan Ye.
Claims (25)
1. processing and continuous casting step, its feature outside a kind of smelting process of V, Ti micro alloyed steel, including pneumatic steelmaking, chain-wales stove
It is：
The deoxidation alloying process in the pneumatic steelmaking stage is：During converter smelting molten steel endpoint carbon content≤0.04%, in steel
Carbon dust, carburant progress pre-deoxidation are first added when water is paved with ladle pot bottom, when weight of tapping accounts for the 1/3~1/2 of gross weight,
Carburant, double deoxidizer and silicomangan are sequentially added, after tapping terminates, adds vanadium iron, ferrotianium；Converter smelting molten steel is whole
Point carbon content ＞ 0.04% when, tap weight account for the 1/3~1/2 of gross weight when be directly added into carburant, double deoxidizer with
And silicomangan, after tapping terminates, add vanadium iron, ferrotianium；
Outbound oxygen activity≤the 50ppm of the outer processing stage control chain-wales of the chain-wales stove；
V, Ti micro alloyed steel composition is：By weight percentage, C：0.20~0.25%, Si：0.03~0.08%, Mn：
0.10~0.15%, P：0~0.035%, S：0~0.035%, V：0.01~0.05%, Ti：0.01~0.05%, Cr：0~
0.03%, Ni：0~0.03%, surplus is Fe and inevitable impurity.
2. the smelting process of V, Ti micro alloyed steel according to claim 1, it is characterised in that：The carbon dust addition is
0.15~0.30kg/t steel.
3. the smelting process of V, Ti micro alloyed steel according to claim 1 or 2, it is characterised in that：The carburant adds
Dosage is：During carbon content≤0.04%, add carburant 0.2~0.5kg/t steel for the first time, add for second carburant 2.1~
2.8kg/t steel；During carbon content ＞ 0.04%, carburant 2.2~2.6kg/t steel is added.
4. the smelting process of V, Ti micro alloyed steel according to claim 1, it is characterised in that：The double deoxidizer is
CaC260~65wt%, 28~34wt% of Si double deoxidizer, addition are 1.4~1.6kg/t steel.
5. the smelting process of V, Ti micro alloyed steel according to claim 2, it is characterised in that：The double deoxidizer is
CaC260~65wt%, 28~34wt% of Si double deoxidizer, addition are 1.4~1.6kg/t steel.
6. the smelting process of V, Ti micro alloyed steel according to claim 3, it is characterised in that：The double deoxidizer is
CaC260~65wt%, 28~34wt% of Si double deoxidizer, addition are 1.4~1.6kg/t steel.
7. the smelting process of V, Ti micro alloyed steel according to claim 1, it is characterised in that：The silicomangan is Mn：
60.0~67.0wt%, Si：14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
8. the smelting process of V, Ti micro alloyed steel according to claim 2, it is characterised in that：The silicomangan is Mn：
60.0~67.0wt%, Si：14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
9. the smelting process of V, Ti micro alloyed steel according to claim 3, it is characterised in that：The silicomangan is Mn：
60.0~67.0wt%, Si：14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
10. the smelting process of V, Ti micro alloyed steel according to claim 4, it is characterised in that：The silicomangan is Mn：
60.0~67.0wt%, Si：14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
11. the smelting process of V, Ti micro alloyed steel according to claim 5, it is characterised in that：The silicomangan is
Mn：60.0~67.0wt%, Si：14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
12. the smelting process of V, Ti micro alloyed steel according to claim 6, it is characterised in that：The silicomangan is Mn：
60.0~67.0wt%, Si：14.0~17.0wt% silicomangan, addition are 2.1~2.4kg/t steel.
13. the smelting process of V, Ti micro alloyed steel according to claim 1, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
14. the smelting process of V, Ti micro alloyed steel according to claim 2, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
15. the smelting process of V, Ti micro alloyed steel according to claim 3, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
16. the smelting process of V, Ti micro alloyed steel according to claim 4, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
17. the smelting process of V, Ti micro alloyed steel according to claim 5, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
18. the smelting process of V, Ti micro alloyed steel according to claim 6, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
19. the smelting process of V, Ti micro alloyed steel according to claim 7, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
20. the smelting process of V, Ti micro alloyed steel according to claim 8, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
21. the smelting process of V, Ti micro alloyed steel according to claim 9, it is characterised in that：The vanadium iron is that V content is
50% vanadium iron, addition are 0.7~0.95kg/t steel.
22. the smelting process of V, Ti micro alloyed steel according to claim 10, it is characterised in that：The vanadium iron is V content
For 50% vanadium iron, addition is 0.7~0.95kg/t steel.
23. the smelting process of V, Ti micro alloyed steel according to claim 11, it is characterised in that：The vanadium iron is V content
For 50% vanadium iron, addition is 0.7~0.95kg/t steel.
24. the smelting process of V, Ti micro alloyed steel according to claim 12, it is characterised in that：The vanadium iron is V content
For 50% vanadium iron, addition is 0.7~0.95kg/t steel.
25. the smelting process of V, Ti micro alloyed steel according to claim 1~2,4~24 any one, it is characterised in that：Institute
It is the ferrotianium that Ti contents are 30% to state ferrotianium, and addition is 1.2~1.45kg/t steel.
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