CN108715913A - A kind of method of electric furnace smelting 9Ni steel - Google Patents
A kind of method of electric furnace smelting 9Ni steel Download PDFInfo
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- CN108715913A CN108715913A CN201810580966.5A CN201810580966A CN108715913A CN 108715913 A CN108715913 A CN 108715913A CN 201810580966 A CN201810580966 A CN 201810580966A CN 108715913 A CN108715913 A CN 108715913A
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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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
- 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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- 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
- C21C7/0006—Adding metallic additives
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a kind of methods of electric furnace smelting 9Ni steel, and the method includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves to be vacuum-treated process；The residual oxygen decarbonization process of VD stoves vacuum, steel ladle enter VD stoves, and vacuum degree reaches≤200Pa, release vacuum, and the carbon in molten steel takes off：C≤0.01%.The present invention is just refined using EAF stoves, and control tapping liquid steel temperature and ingredient enter VD vacuum decarburizations, enter back into LF stove refining procedure deoxidations and adjusting component, be most vacuum-treated afterwards through VD stoves, rationally control pouring temperature later.9Ni steel produced by the invention, ingredient is qualified, and field trash is few, the steel plate thickness≤50mm shut out, yield strength Rp0.2 >=515MPa, tensile strength Rm：690~825MPa；Minimal impact work(>=21J, lateral expansion >=0.381mm at -196 DEG C.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of method of electric furnace smelting 9Ni steel.
Background technology
9Ni steel is in ultralow temperature（- 196 DEG C or less）When have good obdurability, and process, welding performance it is all fine,
It is the ideal material of the low temperature high alloy pressure vessel such as LNG storage tank.Alloy content is high（Ni about 9%）, it is desirable that -196 DEG C of ballistic work cross
To >=21J, P, S require as low as possible, essential element C in steel：0.05%~0.07%, Si：0.16%~0.30%, Mn：
0.70%~0.80%, P≤0.007%, S≤0.003%, Ni：9.1%~9.4%.Alloy addition is big, the control of electric furnace smelting C, P
Difficulty is larger, and the requirement to field trash is stringent.
Since 9Ni steel carbon contents are low, if directly smelting 9Ni steel after electric furnace steel tapping, the C < 0.02% of molten steel are needed, at this time
Molten steel serious peroxidating not only needs to consume a large amount of deoxidiers, and deoxidier increases the pollution to molten steel；LF refining furnace adds
Enter that alloy amount is big, and electric power feeding time is long, the carbon of electrode delamination make the C of molten steel be easy the super upper limit sentence it is useless.
Invention content
The technical problem to be solved in the present invention is to provide a kind of method of electric furnace smelting 9Ni steel, this method use EAF stoves for
Decarburization creates conditions, and through VD decarburizations to C≤0.01%, alloying component, deoxidation and removal of inclusions, last high vacuum are adjusted in LF
Deaerate simultaneously removal of inclusions, keeps the molten steel composition before cast qualified, degree of purity is high；The 9Ni steel of production, ingredient is qualified, field trash
Few, the steel plate inspection qualification rate shut out is high, and performance is met the requirements.
In order to solve the above technical problems, the technical solution used in the present invention is：A kind of method of electric furnace smelting 9Ni steel,
The method includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves to be vacuum-treated process；The VD stoves are true
Empty residual oxygen decarbonization process, steel ladle enter VD stoves, and vacuum degree reaches≤200Pa, release vacuum, and the carbon in molten steel takes off：C≤
0.01%。
EAF stoves of the present invention just refine process, when 0.02%≤C≤0.05%, P≤0.004%, the slight peroxidating of molten steel without
Slag is tapped, and tapping molten steel to ladle temperature control is 1590~1630 DEG C, addition lime 2~3kg/t steel when tapping.
LF stoves refining procedure of the present invention, molten steel reach 1630 DEG C or more into LF stoves, first feeding temperature-raising and slag making, temperature
The alloy Ni of 40~50kg/t steel is added；Continue to heat up, temperature reaches 1630 DEG C or more again, and the conjunction of 40~50kg/t steel is added
Golden Ni；Then temperature reaches 1600 DEG C or more and feeds strong deoxidier aluminum steel 1.4~1.8kg/t steel；Power transmission, with 0.2~0.5kg/t
Steel aluminum shot or 0.2~0.5kg/t steel aluminium powder deoxidations, 5min is interior to bleach clinker and keeps white slag, adjusts Si, Mn ingredient, works as temperature
Degree reaches 1620~1640 DEG C, and field trash is removed in 2~4min of strong mixing, desulfurization, and molten steel is not exposed, if S > 0.004%, continuation is stirred by force
It mixes；As white slag holding >=25min, molten steel C：0.03~0.05%, Si：0.16~0.20%, Mn：0.70~0.80%, S≤
0.004%, Ni：9.1~9.3%, temperature reaches 1660~1680 DEG C, and LF refining terminates；30~60% clinkers are outwelled, into VD works
Sequence.
VD of the present invention is vacuum-treated process, after finely tuning molten steel composition, 160~300NL/min of argon flow amount, and vacuum degree
≤ 66.7Pa processing >=20min；VD terminates, 8~15min of weak stirring, and molten steel is not exposed；Temperature is required when molten steel reaches cast,
Bull ladle pours into ingot blank.
The slight peroxidating of molten steel of the present invention refers to molten steel C content≤0.05%, 100~500ppm of oxygen content.
Strong mixing of the present invention refers to 800~1500NL/min of argon flow amount, it is weak stirring refer to argon flow amount 20~
50NL/min。
The 9Ni steel chemical compositions of the method for the invention production：C：0.05~0.07%, Si：0.16~0.30%, Mn：
0.70~0.80%, P≤0.007%, S≤0.003%, Ni：9.1~9.4%, remaining is Fe and inevitable impurity element；
9Ni steel steel plate thickness≤50mm of the method for the invention production.
The 9Ni steel plate properties of the method for the invention production：Yield strength Rp0.2 >=515MPa, tensile strength Rm：
690~825MPa；Minimal impact work(>=21J, lateral expansion >=0.381mm at -196 DEG C.
9Ni steel steel plate inspection qualification rate >=99.4% of the method for the invention production.
A kind of method of electric furnace smelting 9Ni steel of the present invention, 9Ni steel product canonical reference ASTM A20；Properties of product detect
Method standard refers to ASTM A370；Product non-destructive testing standard refers to A578/A 578M.
It is using advantageous effect caused by above-mentioned technical proposal：1, the present invention uses the residual oxygen decarburization of VD stove vacuum, profit
The characteristics of being easy to carry out with reaction between carbon and oxygen under vacuum, and carbon oxygen product CO is easy to be discharged, while can also carry and other have
Molten steel is discharged in evil gas N, H, and the LF deoxidiers consumption after reducing purifies molten steel.2, the present invention is refined by LF stoves, starts rank
The first feeding temperature-raising of section, not deoxidation, temperature-rise period is not since molten steel and clinker carry out deoxidation, and the carbon of electrode delamination is by clinker or molten steel
In oxygen oxidation, so that molten steel is not risen carbon or the carbon that rises less；Alloy is added in two portions, and can cool down excessive, clinker to avoid molten steel clinker
Poor fluidity, the molten steel carbon that rises is too fast when power transmission.3, the present invention enhances deoxidizing capacity, promotees by only using aluminum shot or aluminium powder deoxidation
Field trash is adsorbed into clinker.4, for the present invention by high vacuum degassing, control is vacuum-treated and subsequent argon gas stirring intensity, can
Degasifying effect is improved, promotes clinker to field trash absorption, avoid secondary oxidation of steel.5,9Ni steel produced by the invention, at division
Lattice, field trash is few, and the steel plate inspection qualification rate shut out reaches 99.4% or more.6, the 9Ni steel steel plates of the method for the invention production
Thickness≤50mm, yield strength Rp0.2 >=515MPa, tensile strength Rm：690~825MPa, minimal impact work(at -196 DEG C >=
21J, lateral expansion >=0.381mm.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail.
Embodiment 1
The method of the present embodiment electric furnace smelting 9Ni steel includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves
It is vacuum-treated process, specific process step is as described below：
（1）EAF stoves just refine process：Tap 100t, molten steel to 1590 DEG C of ladle temperature, addition lime 2kg/t steel, molten steel when tapping
C：0.02%,P：0.004%, oxygen content 100ppm；
（2）The residual oxygen decarbonization process of VD stove vacuum：Steel ladle enters VD stoves, and vacuum degree 200Pa releases vacuum, and the carbon in molten steel is de-
It arrives：C：0.01%；
（3）LF stove refining procedures：Into LF stoves, first feeding temperature-raising and slag making, temperature reaches 1630 DEG C and 40kg/t steel is added molten steel
Alloy Ni；It then proceedes to heat up, temperature reaches 1640 DEG C, and the alloy Ni of 50kg/t steel is added；Liquid steel temperature reaches 1610 DEG C and feeds
Enter aluminum steel 1.4kg/t steel；Power transmission, with 0.5kg/t steel aluminum shot deoxidations, 5min is interior to bleach clinker and keeps white slag, adjusts Si, Mn
Ingredient, when temperature reaches 1620 DEG C, argon flow amount 1100NL/min strong mixings 3min；When white slag keeps 25min, molten steel C：
0.04%, Si：0.16%, Mn：0.70%, S：0.004%, Ni：9.1%, temperature reaches 1660 DEG C, and LF refining terminates；Outwell 50% stove
Slag, into VD processes；
（4）VD is vacuum-treated process：After finely tuning molten steel composition, vacuum degree≤66.7Pa, argon flow amount 160NL/min, processing
20min；VD terminates the weak stirring 8min of argon flow amount 35NL/min, and when liquid steel temperature reaches requirement temperature, bull ladle pours into ingot blank.
The present embodiment 9Ni steel finished products：Ni：9.10%,C：0.06%,P：0.006%,S：0.002%, Si：0.16%, Mn：
0.70%, remaining is Fe and inevitable impurity element.
The present embodiment 9Ni steel finished product thicknesses are 14mm, steel plate inspection qualification rate 100%；End properties：Yield strength
Rp0.2：560MPa, tensile strength Rm：705MPa, minimal impact work(at -196 DEG C：30J, lateral expansion：0.68mm.
Embodiment 2
The method of the present embodiment electric furnace smelting 9Ni steel includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves
It is vacuum-treated process, specific process step is as described below：
（1）EAF stoves just refine process：Tap 100t, molten steel to 1630 DEG C of ladle temperature, addition lime 3kg/t steel, molten steel when tapping
C：0.03%,P：0.003%, oxygen content 300ppm；
（2）The residual oxygen decarbonization process of VD stove vacuum：Steel ladle enters VD stoves, and vacuum degree 200Pa releases vacuum, and the carbon in molten steel is de-
It arrives：C：0.008%；
（3）LF stove refining procedures：Into LF stoves, first feeding temperature-raising and slag making, temperature reaches 1640 DEG C and 50kg/t steel is added molten steel
Alloy Ni；It then proceedes to heat up, temperature reaches 1650 DEG C, and the alloy Ni of 42kg/t steel is added；Liquid steel temperature reaches 1620 DEG C and feeds
Enter aluminum steel 1.8kg/t steel；Power transmission, with 0.2kg/t steel aluminium powder deoxidations, 5min is interior to bleach clinker and keeps white slag, adjusts Si, Mn
Ingredient, when temperature reaches 1640 DEG C, argon flow amount 1200NL/min strong mixings 2min；When white slag keeps 32min, molten steel C：
0.03%, Si：0.18%, Mn：0.80%, S：0.003%, Ni：9.25%, temperature reaches 1680 DEG C, and LF refining terminates；Outwell 50% stove
Slag, into VD processes；
（4）VD is vacuum-treated process：After finely tuning molten steel composition, vacuum degree≤66.7Pa, argon flow amount 300NL/min, processing
20min；VD terminates the weak stirring 12min of argon flow amount 40NL/min, when liquid steel temperature reaches requirement temperature, bull ladle casting ingot-forming
Base.
The present embodiment 9Ni steel finished products：Ni：9.25%,C：0.050%,P：0.005%,S：0.0015%, Si：0.18%, Mn：
0.80%, remaining is Fe and inevitable impurity element.
The present embodiment 9Ni steel finished product thicknesses are 20mm, steel plate inspection qualification rate 100%；End properties：Yield strength
Rp0.2：620MPa, tensile strength Rm：770MPa, minimal impact work(at -196 DEG C：40J, lateral expansion：0.50mm.
Embodiment 3
The method of the present embodiment electric furnace smelting 9Ni steel includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves
It is vacuum-treated process, specific process step is as described below：
（1）EAF stoves just refine process：Tap 100t, molten steel to 1610 DEG C of ladle temperature, addition lime 2.5kg/t steel, steel when tapping
Water C：0.04%,P：0.004%, oxygen content 200ppm；
（2）The residual oxygen decarbonization process of VD stove vacuum：Steel ladle enters VD stoves, and vacuum degree 200Pa releases vacuum, and the carbon in molten steel is de-
It arrives：C：0.01%；
（3）LF stove refining procedures：Into LF stoves, first feeding temperature-raising and slag making, temperature reaches 1635 DEG C and 45kg/t steel is added molten steel
Alloy Ni；It then proceedes to heat up, temperature reaches 1635 DEG C, and the alloy Ni of 46kg/t steel is added；Liquid steel temperature reaches 1620 DEG C and feeds
Enter aluminum steel 1.6kg/t steel；Power transmission, with 0.2kg/t steel aluminum shot deoxidations, 5min is interior to bleach clinker and keeps white slag, adjusts Si, Mn
Ingredient, when temperature reaches 1630 DEG C, argon flow amount 1000NL/min strong mixings 4min；When white slag keeps 26min, molten steel C：
0.05%, Si：0.20%, Mn：0.75%, S：0.0025%, Ni：9.15%, temperature reaches 1675 DEG C, and LF refining terminates；Outwell 60%
Clinker, into VD processes；
（4）VD is vacuum-treated process：After finely tuning molten steel composition to internal control range, vacuum degree≤66.7Pa, argon flow amount 260NL/
Min handles 20min；VD terminates the weak stirring 15min of argon flow amount 30NL/min, and when liquid steel temperature reaches requirement temperature, bull ladle pours
Form ingot blank.
The present embodiment 9Ni steel finished products：Ni：9.20%,C：0.062%,P：0.006%,S：0.002%, Si：0.30%, Mn：
0.75%, remaining is Fe and inevitable impurity element.
The present embodiment 9Ni steel finished product thicknesses are 50mm, steel plate inspection qualification rate 99.5%；End properties：Yield strength
Rp0.2：600MPa, tensile strength Rm：730MPa, minimal impact work(at -196 DEG C：55J, lateral expansion：0.53mm.
Embodiment 4
The method of the present embodiment electric furnace smelting 9Ni steel includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves
It is vacuum-treated process, specific process step is as described below：
（1）EAF stoves just refine process：Tap 100t, molten steel to 1600 DEG C of ladle temperature, addition lime 2.8kg/t steel, steel when tapping
Water C：0.05%,P：0.002%, oxygen content 400ppm；
（2）The residual oxygen decarbonization process of VD stove vacuum：Steel ladle enters VD stoves, and vacuum degree 200Pa releases vacuum, and the carbon in molten steel is de-
It arrives：C：0.007%；
（3）LF stove refining procedures：Into LF stoves, first feeding temperature-raising and slag making, temperature reaches 1630 DEG C and 48kg/t steel is added molten steel
Alloy Ni；It then proceedes to heat up, temperature reaches 1645 DEG C, and the alloy Ni of 43kg/t steel is added；Liquid steel temperature reaches 1620 DEG C and feeds
Enter aluminum steel 1.55kg/t steel；Clinker is bleached in 5min and is kept white slag with 0.5kg/t steel aluminium powder deoxidations by power transmission, adjustment Si,
Mn ingredients, when temperature reaches 1640 DEG C, argon flow amount 1500NL/min strong mixings 3min；When white slag keeps 30min, molten steel C：
0.045%, Si：0.16%, Mn：0.70%, S：0.004%, Ni：9.1%, temperature reaches 1660 DEG C, and LF refining terminates；Outwell 40% stove
Slag, into VD processes；
（4）VD is vacuum-treated process：After finely tuning molten steel composition to internal control range, vacuum degree≤66.7Pa, argon flow amount 280NL/
Min handles 20min；VD terminates the weak stirring 10min of argon flow amount 20NL/min, and when liquid steel temperature reaches requirement temperature, bull ladle pours
Form ingot blank.
The present embodiment 9Ni steel finished products：Ni：9.18%,C：0.06%,P：0.006%,S：0.002%, Si：0.16%, Mn：
0.70%, remaining is Fe and inevitable impurity element.
The present embodiment 9Ni steel finished product thicknesses are 40mm, steel plate inspection qualification rate 99.6%；End properties：End properties：It bends
Take intensity Rp0.2：715MPa, tensile strength Rm：761MPa, minimal impact work(at -196 DEG C：35J, lateral expansion：0.49mm.
This implementation 5
The method of the present embodiment electric furnace smelting 9Ni steel includes the just refining of EAF stoves, the residual oxygen decarburization of VD stove vacuum, the refining of LF stoves and VD stoves
It is vacuum-treated process, specific process step is as described below：
（1）EAF stoves just refine process：Tap 105t, molten steel to 1630 DEG C of ladle temperature, addition lime 3.0kg/t steel, steel when tapping
Water C：0.03%,P：0.002%, oxygen content 500ppm；
（2）The residual oxygen decarbonization process of VD stove vacuum：Steel ladle enters VD stoves, and vacuum degree reaches 180Pa, releases vacuum, in molten steel
Carbon takes off：C：0.005%；
（3）LF stove refining procedures：Into LF stoves, first feeding temperature-raising and slag making, temperature reaches 1640 DEG C and 46kg/t steel is added molten steel
Alloy Ni；It then proceedes to heat up, temperature reaches 1630 DEG C, and the alloy Ni of 40kg/t steel is added；Liquid steel temperature reaches 1600 DEG C and feeds
Enter aluminum steel 1.7kg/t steel；Power transmission, with 0.4kg/t steel aluminum shot deoxidations, 5min is interior to bleach clinker and keeps white slag, adjusts Si, Mn
Ingredient, when temperature reaches 1625 DEG C, argon flow amount 800NL/min strong mixings 3min；When white slag keeps 28min, molten steel C：
0.05%, Si：0.17%, Mn：0.72%, S：0.003%, Ni：9.3%, temperature reaches 1680 DEG C, and LF refining terminates, and outwells 30% stove
Slag, into VD processes；
（4）VD is vacuum-treated process：After finely tuning molten steel composition to internal control range, vacuum degree≤66.7Pa, argon flow amount 220NL/
Min handles 25min；VD terminates the weak stirring 13min of argon flow amount 50NL/min, and when liquid steel temperature reaches requirement temperature, bull ladle pours
Form ingot blank.
The present embodiment 9Ni steel finished products：Ni：9.4%,C：0.07%,P：0.007%,S：0.003%, Si：0.20%, Mn：
0.75%, remaining is Fe and inevitable impurity element.
The present embodiment 9Ni steel finished product thicknesses are 28mm, steel plate inspection qualification rate 99.5%；End properties：End properties：It bends
Take intensity Rp0.2：705MPa, tensile strength Rm：756MPa, minimal impact work(at -196 DEG C：26J, lateral expansion：0.53mm.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those of ordinary skill in the art that：Still can the present invention be modified or be waited
With replacing, without departing from the spirit or scope of the invention, or any substitutions, the power in the present invention should all be covered
In sharp claimed range.
Claims (10)
1. a kind of method of electric furnace smelting 9Ni steel, which is characterized in that the method includes EAF stoves just to refine, the residual oxygen of VD stove vacuum is de-
Carbon, the refining of LF stoves and VD stoves are vacuum-treated process；The residual oxygen decarbonization process of VD stoves vacuum, steel ladle enter VD stoves, vacuum degree
Reach≤200Pa, release vacuum, the carbon in molten steel takes off：C≤0.01%.
2. a kind of method of electric furnace smelting 9Ni steel according to claim 1, which is characterized in that the EAF stoves just refine work
Sequence, when 0.02%≤C≤0.05%, P≤0.004%, the slight peroxidating slag free tapping of molten steel, tapping molten steel to ladle temperature controls
It is 1590~1630 DEG C, lime 2~3kg/t steel is added when tapping.
3. a kind of method of electric furnace smelting 9Ni steel according to claim 1, which is characterized in that the LF stoves refining procedure,
For molten steel into LF stoves, first feeding temperature-raising and slag making, temperature reaches the alloy Ni of 1630 DEG C or more addition 40~50kg/t steel；After of continuing rising
Temperature, temperature reach 1630 DEG C or more again, and the alloy Ni of 40~50kg/t steel is added；Then temperature reaches 1600 DEG C or more and feeds
Strong deoxidier aluminum steel 1.4~1.8kg/t steel；Power transmission, with 0.2~0.5kg/t steel aluminum shot or 0.2~0.5kg/t steel aluminium powder deoxidations,
Clinker is bleached in 5min and keeps white slag, adjusts Si, Mn ingredient；When temperature reaches 1620~1640 DEG C, strong mixing 2~
Field trash is removed in 4min, desulfurization, and molten steel is not exposed, if S > 0.004%, continues strong mixing；As white slag holding >=25min, molten steel C：
0.03~0.05%, Si：0.16~0.20%, Mn：0.70~0.80%, S≤0.004%, Ni：9.1~9.3%, temperature reaches 1660
~1680 DEG C, LF refining terminates；30~60% clinkers are outwelled, into VD processes.
4. a kind of method of electric furnace smelting 9Ni steel according to claim 1, which is characterized in that the VD is vacuum-treated work
Sequence, after finely tuning molten steel composition, 160~300NL/min of argon flow amount, vacuum degree≤66.7Pa processing >=20min；VD terminates, weak
8~15min is stirred, molten steel is not exposed.
5. a kind of method of electric furnace smelting 9Ni steel according to any one of claims 1-4, which is characterized in that the steel
The slight peroxidating of water refers to molten steel C content≤0.05%, 100~500ppm of oxygen content.
6. a kind of method of electric furnace smelting 9Ni steel according to any one of claims 1-4, which is characterized in that described strong
Stirring refers to 800~1500NL/min of argon flow amount, and weak stirring refers to 20~50NL/min of argon flow amount.
7. a kind of method of electric furnace smelting 9Ni steel according to any one of claims 1-4, which is characterized in that the side
The 9Ni steel chemical compositions of method production：C：0.05~0.07%, Si：0.16~0.30%, Mn：0.70~0.80%, P≤0.007%, S
≤ 0.003%, Ni：9.1~9.4%, remaining is Fe and inevitable impurity element.
8. a kind of method of electric furnace smelting 9Ni steel according to any one of claims 1-4, which is characterized in that the side
9Ni steel steel plate thickness≤50mm of method production.
9. a kind of method of electric furnace smelting 9Ni steel according to any one of claims 1-4, which is characterized in that the side
The 9Ni steel plate properties of method production：Yield strength Rp0.2 >=515MPa, tensile strength Rm：690~825MPa；At -196 DEG C most
Small ballistic work >=21J, lateral expansion >=0.381mm.
10. a kind of method of electric furnace smelting 9Ni steel according to any one of claims 1-4, which is characterized in that the side
9Ni steel steel plate inspection qualification rate >=99.4% of method production.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810580966.5A CN108715913B (en) | 2018-06-07 | 2018-06-07 | Method for smelting 9Ni steel by electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810580966.5A CN108715913B (en) | 2018-06-07 | 2018-06-07 | Method for smelting 9Ni steel by electric furnace |
Publications (2)
| Publication Number | Publication Date |
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| CN108715913A true CN108715913A (en) | 2018-10-30 |
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| CN109666854A (en) * | 2019-01-15 | 2019-04-23 | 舞阳钢铁有限责任公司 | A kind of smelting process of mild steel |
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