CN107699659A - A kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion - Google Patents
A kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion Download PDFInfo
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- CN107699659A CN107699659A CN201710979524.3A CN201710979524A CN107699659A CN 107699659 A CN107699659 A CN 107699659A CN 201710979524 A CN201710979524 A CN 201710979524A CN 107699659 A CN107699659 A CN 107699659A
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- heavy rail
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/10—Handling in a vacuum
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- Engineering & Computer Science (AREA)
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- Metallurgy (AREA)
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Abstract
The invention discloses a kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion, belong to technical field of ferrous metallurgy.Present invention solves the technical problem that it is to provide a kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion.The denaturation method of Properties of Heavy Rail Steel Sulfide inclusion, this method include molten iron pretreatment, converter smelting, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling the step of；In the LF refining, accurate desulfurization is carried out, it is 0.002%~0.020% to control molten steel S contents, control molten steel a [O]≤0.0015%；In the RH refinings, TiO is added2, control TiO2Addition be Metal Weight 0.0100%~0.0200%.The inventive method passes through to molten steel S contents, a [O] and TiO2The control of addition, using TiO2Properties of Heavy Rail Steel MnS field trashes are denatured, Sulfide inclusion modulus of elasticity average value is set to reach 30~50Gpa, Sulfide inclusion grading is reduced ,≤1.5 grades of grading ratios of inclusion in heavy rail thing grading is brought up to 80%~100%, significantly improves heavy rail steel quality.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, and in particular to a kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion.
Background technology
Properties of Heavy Rail Steel is the chief component of railroad track, in railway transport course, to locomotive provide effectively support and
Guiding, is subjected to the huge lateral pressure from wheel.Based on China's infrastructure growth requirement, railway transportation is just with swift and violent
Speed develops, and constantly tends to high speed, heavy loading.This undoubtedly highlights more stringent requirement to Properties of Heavy Rail Steel quality.
Because the interface that MnS is mingled between matrix in Properties of Heavy Rail Steel has strong suction-operated to the hydrogen in steel, protected in steel
Certain Mn, S are held, Hydrogen diffusion coefficient can be greatly lowered, this to the very sensitive Properties of Heavy Rail Steel of hydrogen induced cracking for extremely having
Profit, still, the MnS impurity substantially deformed in steel are unfavorable to the laterally wilful and anisotropy of Properties of Heavy Rail Steel, therefore the reduction that should try one's best
The precipitation of MnS field trashes or change MnS pattern in steel.
Properties of Heavy Rail Steel is more sensitive to MnS field trashes, requires that Sulfide inclusion grading is more low better in use.
MnS deflection belongs to higher material with respect to matrix material in Properties of Heavy Rail Steel, to prevent it from occurring in the operation of rolling compared with large deformation,
So as to form larger formation of crack, it is necessary to improve MnS hardness.
The control being mingled with for Properties of Heavy Rail Steel MnS, conventional method typically using desulfurization, Ca handling process or add rare earth, but
It is difficult to effectively control MnS to be mingled with, the problem of A type impurities are exceeded or even ultrasonic examination is got along well easily occurs.
In this area, high speed heavy rail steel requires A type impurity≤1.5 grade, and general rail requires A type impurity≤2.0 grade (A classes
Field trash is Sulfide inclusion).When producing high speed heavy rail steel, because A type impurities are more than 1.5 grades, to change the original sentence to rail general
Rail, serious economic loss is caused, therefore, be badly in need of a kind of method that can reduce the grading of Properties of Heavy Rail Steel A type impurities at present.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion, this method
The pattern of MnS field trashes can be effectively controlled, reduces Sulfide inclusion grading, and improves MnS hardness, increases sulfide
Field trash modulus of elasticity, so as to improve heavy rail steel quality.
Technical scheme there is provided a kind of Properties of Heavy Rail Steel Sulfide inclusion used by the present invention solves above-mentioned technical problem
Denaturation method, this method includes molten iron pretreatment, converter smelting, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling
Step, it is characterised in that：In the LF refining, accurate desulfurization is carried out, it is 0.002%~0.020% to control molten steel S contents, control
Molten steel a [O]≤0.0015% processed；In the RH refinings, TiO is added2, control TiO2Addition for Metal Weight
0.0100%~0.0200%.
Wherein, in the denaturation method of Properties of Heavy Rail Steel Sulfide inclusion described above, the operation of the control molten steel S contents
For：In LF refining, desulfurization is carried out by high alkalinity refining slag.
Wherein, in the denaturation method of Properties of Heavy Rail Steel Sulfide inclusion described above, the behaviour of the control molten steel oxygen activity
As：In LF refining, using CaC2Or SiC is added in ladle slag.
Wherein, in the denaturation method of above-mentioned Properties of Heavy Rail Steel Sulfide inclusion, the TiO2For anatase titanium dioxide or rutile-type,
Granularity is 0.001 μm~30 μm.
Preferably, in the denaturation method of above-mentioned Properties of Heavy Rail Steel Sulfide inclusion, the TiO2For nano-TiO2。
Wherein, in the denaturation method of above-mentioned Properties of Heavy Rail Steel Sulfide inclusion, the continuous casting is bloom continuous casting.
In the present invention, the content is mass content, and the oxygen activity is expressed as a [O].
Beneficial effects of the present invention：
The inventive method is 0.002%~0.020% by controlling molten steel S contents, molten steel a [O]≤0.0015%, TiO2
For 0.0100%~0.0200%, creative uses TiO2Properties of Heavy Rail Steel MnS field trashes are denatured, make to be formed in Properties of Heavy Rail Steel
(TiO2+ MnS) complex inclusion, Sulfide inclusion modulus of elasticity average value reaches 30~50Gpa under normal temperature, reduces sulphur
Compound field trash is graded, and≤1.5 grades of grading ratios of Properties of Heavy Rail Steel A classes (sulfide) field trash grading is brought up to 80%~100%,
Significantly improve heavy rail steel quality.
Embodiment
Specifically, a kind of denaturation method of Properties of Heavy Rail Steel Sulfide inclusion, this method includes molten iron pretreatment, converter smelting
The step of refining, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling, it is characterised in that：In the LF refining, carry out accurate
Desulfurization, it is 0.002%~0.020% to control molten steel S contents, control molten steel a [O]≤0.0015%；In the RH refinings, add
TiO2, control TiO2Addition be Metal Weight 0.0100%~0.0200%.
The MnS impurity substantially deformed in steel is unfavorable to the laterally wilful and anisotropy of Properties of Heavy Rail Steel, therefore the reduction that should try one's best
The precipitation of MnS field trashes or change MnS pattern in steel.By calculation of thermodynamics, for Properties of Heavy Rail Steel, S contents are lower,
MnS can be fewer in the quantity that solidification front separates out, and can reduce the grading of MnS field trashes, but considers economical production, and the present invention is specially
Profit controls S 0.002%~0.020%.
The present invention is from MnS performances, and by carrying out accurate desulfurization in LF refining, it is 0.002% to control molten steel S contents
~0.020%, molten steel a [O]≤0.0015%；The control of S contents mainly carries out desulfurization by high alkalinity refining slag, according to LF
The S contents that enter the station add the high alkalinity refining slag of different weight into ladle；A [O] control uses mainly in LF refining
CaC2Or SiC is added in ladle slag, then the diffusive deoxidation effect by molten steel and ladle slag, guarantee molten steel a [O]≤
0.0015%, to ensure the fatigue behaviour of Properties of Heavy Rail Steel；TiO is added in RH refinings2, MnS field trashes are denatured, make TiO2
In solidification front (TiO is combined to form with the MnS formed2+ MnS) complex inclusion, make in Properties of Heavy Rail Steel (TiO2+ MnS) compound folder
The modulus of elasticity of debris is significantly higher than MnS, and complex inclusion modulus of elasticity reaches 30~50Gpa, and MnS modulus of elasticity only 20
~28Gpa, add TiO2The hardness of Properties of Heavy Rail Steel Sulfide inclusion is improved afterwards, reduces change of the type impurity in the operation of rolling
Shape, and then heavy rail Steel Properties can be improved, wherein, TiO2Addition be Metal Weight 0.0100%~0.0200%.
In the inventive method, to avoid introducing impurity, the TiO2Anatase titanium dioxide or rutile-type may be selected；TiO2Granularity
Bigger, the size of the complex inclusion of generation is bigger, and Sulfide inclusion grading is higher, therefore TiO2Size is the smaller the better, excellent
Choosing, TiO2Granularity be 0.001 μm~30 μm；More preferably nano-TiO2。
In the inventive method, except to S contents, a [O] and TiO2Outside the control of addition, remaining operation can be grasped routinely
Carry out.
RH refining furnaces are used in the inventive method RH refinings, avoid causing the scaling loss of trace Ti.
The inventive method is applied to bloom continuous casting production Properties of Heavy Rail Steel, i.e. continuous casting billet cross section is 250mm × more than 250mm
Properties of Heavy Rail Steel production.
The embodiment of the present invention is further described with reference to embodiment, therefore not limited the present invention
System is among described scope of embodiments.
Embodiment 1
The step of molten steel is using molten iron pretreatment, converter smelting, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling
Smelt into Properties of Heavy Rail Steel：Specially：
Accurate desulfurization is carried out in LF refining process, it is 0.020% to control molten steel S contents, and control molten steel a [O] is
0.0015%；In RH refinings, nano-TiO is added2, control TiO2Addition be Metal Weight 0.0185%；
The continuous casting billet that continuous casting goes out 280mm*380mm is carried out again.Typical case in continuous casting billet is vulcanized using nano-hardness tester
Thing field trash carries out modulus of elasticity and is measured, modulus of elasticity average out to 49Gpa；
Rail by the continuous casting billet milling of production into 60kg/m, 10 steel samples are taken to carry out Sulfide inclusion grading at random,
≤ 1.5 grades of grading ratios of Sulfide inclusion grading are 90%.
Embodiment 2
The step of molten steel is using molten iron pretreatment, converter smelting, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling
Smelt into Properties of Heavy Rail Steel：Specially：
Accurate desulfurization is carried out in LF refining process, it is 0.010% that RH is entered into stand control molten steel S contents, control molten steel a [O]
For 0.0012%；In RH refinings, nano-TiO is added2, control TiO2Addition be Metal Weight 0.0158%；
Continuous casting is carried out again, produces 280mm*380mm continuous casting billet, and typical case in continuous casting billet is vulcanized using nano-hardness tester
Thing field trash carries out modulus of elasticity and is measured, modulus of elasticity average out to 41Gpa；
Rail by the continuous casting billet milling of production into 60kg/m, 10 steel samples are taken to carry out Sulfide inclusion grading at random,
≤ 1.5 grades of grading ratios of Sulfide inclusion grading are 100%.
Embodiment 3
The step of molten steel is using molten iron pretreatment, converter smelting, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling
Smelt into Properties of Heavy Rail Steel：Specially：
Accurate desulfurization is carried out in LF refining process, it is 0.004% to control molten steel S contents, and control molten steel a [O] is
0.0009%；In RH refinings, nano-TiO is added2, control TiO2Addition be Metal Weight 0.0105%；
Continuous casting is carried out again, produces 280mm*380mm continuous casting billet, and typical case in continuous casting billet is vulcanized using nano-hardness tester
Thing field trash carries out modulus of elasticity and is measured, modulus of elasticity average out to 33Gpa；
Rail by the continuous casting billet milling of production into 60kg/m, 10 steel samples are taken to carry out Sulfide inclusion grading at random,
≤ 1.5 grades of grading ratios of Sulfide inclusion grading are 80%.
Comparative example 1
The step of molten steel is using molten iron pretreatment, converter smelting, LF refining, RH refinings, continuous casting, hot continuous rolling, cooling control after rolling
Smelt into Properties of Heavy Rail Steel：Specially：
Accurate desulfurization is carried out in LF refining process, it is 0.004% to control molten steel S contents, and control molten steel a [O] is
0.0009%；Nano-TiO is added without in RH refinings2。
Continuous casting is carried out again, produces 280mm*380mm continuous casting billet, and typical case in continuous casting billet is vulcanized using nano-hardness tester
Thing field trash carries out modulus of elasticity and is measured, modulus of elasticity average out to 23Gpa；
Rail by the continuous casting billet milling of production into 60kg/m, 10 steel samples are taken to carry out Sulfide inclusion grading at random,
≤ 1.5 grades of grading ratios of Sulfide inclusion grading are 40%.
From embodiment 1~3 and comparative example 1, the present invention is by molten steel S contents, a [O] and TiO2The control of addition
System, makes Properties of Heavy Rail Steel Sulfide inclusion modulus of elasticity average value reach 30~50Gpa, reduces Sulfide inclusion grading, makes
Heavy rail field trash grading MnS≤1.5 grade grading ratio brings up to 80%~100%, significantly improves heavy rail steel quality, has
Significant economic benefit, is worthy of popularization.
Claims (6)
1. the denaturation method of Properties of Heavy Rail Steel Sulfide inclusion, including molten iron pretreatment, converter smelting, LF refining, RH refinings, company
The step of casting, hot continuous rolling, cooling control after rolling, it is characterised in that：In the LF refining, accurate desulfurization is carried out, controls the molten steel S contents to be
0.002%~0.020%, control molten steel oxygen activity≤0.0015%；In the RH refinings, TiO is added2, control TiO2Addition
Measure as the 0.0100%~0.0200% of Metal Weight.
2. the denaturation method of Properties of Heavy Rail Steel Sulfide inclusion according to claim 1, it is characterised in that：The control molten steel
The operation of S contents is：In LF refining, desulfurization is carried out by high alkalinity refining slag.
3. the denaturation method of Properties of Heavy Rail Steel Sulfide inclusion according to claim 1, it is characterised in that：The control molten steel
The operation of oxygen activity is：In LF refining, using CaC2Or SiC is added in ladle slag.
4. the denaturation method of Properties of Heavy Rail Steel Sulfide inclusion according to claim 1, it is characterised in that：The TiO2To be sharp
Titanium-type or rutile-type, granularity are 0.001 μm~30 μm.
5. the denaturation method of the Properties of Heavy Rail Steel Sulfide inclusion according to any one of Claims 1 to 4, it is characterised in that：Institute
State TiO2For nano-TiO2。
6. the denaturation method of the Properties of Heavy Rail Steel Sulfide inclusion according to any one of Claims 1 to 5, it is characterised in that：Institute
It is bloom continuous casting to state continuous casting.
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Cited By (5)
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| CN111349751A (en) * | 2020-04-29 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of low-titanium steel |
| CN111349752A (en) * | 2020-04-30 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium dioxide steel core wire |
| CN111455133A (en) * | 2020-04-30 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium-containing titanium dioxide steel core wire |
| CN111455132A (en) * | 2020-04-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of titanium-containing steel |
| CN115029635A (en) * | 2022-06-21 | 2022-09-09 | 湖南华菱湘潭钢铁有限公司 | Large heat input welding high-strength storage tank steel plate and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111349751A (en) * | 2020-04-29 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of low-titanium steel |
| CN111455132A (en) * | 2020-04-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of titanium-containing steel |
| CN111349752A (en) * | 2020-04-30 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium dioxide steel core wire |
| CN111455133A (en) * | 2020-04-30 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium-containing titanium dioxide steel core wire |
| CN115029635A (en) * | 2022-06-21 | 2022-09-09 | 湖南华菱湘潭钢铁有限公司 | Large heat input welding high-strength storage tank steel plate and production method thereof |
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