CN110512048A - A kind of manufacturing method of low aluminium control silicon steel large steel ingot - Google Patents
A kind of manufacturing method of low aluminium control silicon steel large steel ingot Download PDFInfo
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- CN110512048A CN110512048A CN201910956976.9A CN201910956976A CN110512048A CN 110512048 A CN110512048 A CN 110512048A CN 201910956976 A CN201910956976 A CN 201910956976A CN 110512048 A CN110512048 A CN 110512048A
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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
- C21C5/5264—Manufacture of alloyed steels including ferro-alloys
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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
-
- 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
- C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
-
- 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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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to steel ingot manufacturing technology fields, disclose a kind of manufacturing method of low aluminium control silicon steel large steel ingot, the manufacturing method includes the following steps: step 1: electric furnace ingredient, step 2: electric furnace smelting, step 3: refining, step 4: step 5: preliminary adduction gold is vacuum-treated, step 6: secondary adduction gold, step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting.The present invention is suitable for a kind of manufacturing method of low aluminium control silicon steel large steel ingot, the low aluminium control silicon steel large steel ingot manufactured using manufacturing method of the present invention, ingredient all meets code requirement, Al content is controlled 0.05% or so, Molten Steel Cleanliness is substantially improved, its oxygen content is reduced to 10ppm from previous 20ppm, C type impurity content is reduced to 0.5~1 grade by previous 1~1.5 grade, remaining a few type impurity content reduces straight 0~0.5 grade by 0.5~1 grade, and flaw detection qualification rate is by being promoted to 95% or more less than 80% in the past.
Description
Technical field
The present invention relates to steel ingot manufacturing technology field, the manufacturing method of specifically a kind of low aluminium control silicon steel large steel ingot.
Background technique
Low aluminium control silicon steel, i.e. Si killed steel, Al content generally requires≤0.010%, in smelting process, can not use
Al carries out deoxidation, otherwise easily causes Al content exceeded, and simple Si deoxidation, since its deoxidizing capacity limits, deoxidation effect
Fruit is not especially good, and deoxidation products is relatively single, is not easy discharge of floating.And Si killed steel, in casting process easily
It by secondary oxidation, ultimately causes that product oxygen content is higher, and inclusion content is high, and there is UT to detect a flaw underproof situation hair often
It is raw.
The Si killed steel that our company often produces, such as 30Cr1Mo1V High inter case, flaw detection requires relatively high, flaw detection conjunction
Lattice rate is relatively low, generally 80% hereinafter, only 50% or so when minimum.
Low aluminium control silicon steel, general large steel ingot are vacuum-treated molten steel in refining, are poured in using using double vacuum technologies
Between packet sealing vacuum pouring, conditions permit, carry out stopper rod Argon.
Summary of the invention
The present invention provides a kind of manufacturing method of low aluminium control silicon steel large steel ingot, solves mentioned above in the background art ask
Topic.
To achieve the above object, the invention provides the following technical scheme:
A kind of manufacturing method of low aluminium control silicon steel large steel ingot, the manufacturing method include the following steps:
Step 1: this steel grade is added into electric furnace and returns to 78 tons of material, 25 tons of conversion pig and ferrosilicon 500kg for electric furnace ingredient；
Step 2: electric furnace smelting drops to 0.15% when P class sundries content drops to 0.004%, C class sundries content, temperature
When degree is greater than 1650 DEG C, EBT carries out card slag and puts steel into refining packet；
Step 3: it is energization that C powder, silicon calcium powder, pulverized limestone and fluorite, maximum power is added after refining packet enters the station in refining
Slag, reduction add aluminium powder and carbon dust ten minutes later, continue heating reduction 30 minutes；
Step 4: preliminary adduction gold, thermometric, sampling are warming up to 1650 DEG C, alloy in addition to silicon are added, is warming up to 1650
After DEG C, ferrosilicon is added；
Step 5: being vacuum-treated, and ladle is moved to vacuum station and is vacuum-treated, and vacuum degree is down to 133Pa hereinafter, keeping argon
Throughput controls 250~350L/min, and molten steel exposes the top of the slag, is vacuum-treated 30~35 minutes；
Step 6: ladle is moved back to heating station, is warming up to 1625 DEG C, calcium-silicon 50kg is added, adjusted by secondary adduction gold
Whole argon flow is hung out to 60L/min, soft blow 10min；
Step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting carries out 2 external drainages to refining water-coating port, sliding
Plate Argon when vacuum tank is evacuated to 65Pa or less, opens water-gap pouring, while argon blowing by ladle seat on vacuum tank,
Argon pressure 1MPa after pouring molten steel to riser target position, closes the mouth of a river, destroys vacuum, first exothermic mixture 50kg is added,
After calling away by sieve second batch exothermic mixture 250kg is added in ladle, demoulds after 26 hours, hot sending is to forge.
As a preferred technical solution of the present invention, in step 2, pre-deoxidant is added during putting steel: 1.5kg/
Slag charge: 500kg lime is added in the calcium-silicon of t steel.
As a preferred technical solution of the present invention, in step 2, there is a slag phenomenon when putting steel process, refining furnace is not also
Original is warming up to 1620 DEG C or more, carries out converting packet card slag operation.
As a preferred technical solution of the present invention, in step 3, C powder weight is 50kg, and silicon calcium powder weight is
150kg, pulverized limestone weight are 1600kg, and fluorite weight is 700kg.
As a preferred technical solution of the present invention, in step 3, aluminium powder weight is 30kg, and carbon dust weight is 50kg.
As a preferred technical solution of the present invention, in step 6, work as H:1.0ppm, activity oxygen a (O): after 5.9ppm
Heated up and be added again calcium-silicon.
As a preferred technical solution of the present invention, in step 7, suitable carbonization rice husk is added as coverture.
The present invention has following usefulness:
The present invention is suitable for a kind of manufacturing method of low aluminium control silicon steel large steel ingot, using the low of manufacturing method of the present invention manufacture
Aluminium control silicon steel large steel ingot, ingredient all meet code requirement, and Al content is controlled 0.05% or so, and Molten Steel Cleanliness substantially mentions
It rises, oxygen content is reduced to 10ppm from previous 20ppm, and C type impurity content is reduced to 0.5~1 by previous 1~1.5 grade
Grade, remaining a few type impurity content reduce straight 0~0.5 grade by 0.5~1 grade, and flaw detection qualification rate less than 80% by being promoted in the past
95% or more.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of flow chart of the manufacturing method of low aluminium control silicon steel large steel ingot.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one
Referring to Fig. 1, a kind of manufacturing method of low aluminium control silicon steel large steel ingot, the manufacturing method include the following steps:
Step 1: this steel grade is added into electric furnace and returns to 78 tons of material, 25 tons of conversion pig and ferrosilicon 500kg for electric furnace ingredient；
Step 2: P need to be taken off to less than half of the specification upper limit, while control C content control by electric furnace smelting :≤specification
Lower limit -0.05%, and it is greater than 0.10%, when C, P are met the requirements, when P class sundries content drops to 0.004%, C class sundries content
0.15%, when temperature is greater than 1650 DEG C is dropped to, EBT carries out card slag and puts steel into refining packet, is added during putting steel pre- de-
Oxygen agent: the calcium-silicon of 1.5kg/t steel, slag charge is added: 500kg lime has slag phenomenon when putting steel process, and refining furnace does not restore
It carries out converting packet card slag operation after being warming up to 1620 DEG C or more；
Step 3: refining, after refining packet enters the station, addition C powder 0.5kg/t steel, 1.0kg/ tons of steel of silicon calcium powder, pulverized limestone 15~
18kg/t steel and fluorite 6~8kg/t steel, C powder weight are 50kg, and silicon calcium powder weight is 150kg, and pulverized limestone weight is 1600kg,
Fluorite weight is 700kg, and maximum power energization slugging, reduction ten minutes later, add aluminium powder 0.3kg/t steel and carbon dust 0.5kg/t
Steel, aluminium powder weight are 30kg, and carbon dust weight is 50kg, continue heating reduction 30 minutes, the whole recovery time is greater than 40 minutes；
Step 4: preliminary adduction gold, thermometric, sampling are warming up to 1650 DEG C, alloy in addition to silicon are added, is warming up to 1650
After DEG C, ferrosilicon is added；
Step 5: being vacuum-treated, and ladle is moved to vacuum station and is vacuum-treated, and vacuum degree is down to 133Pa hereinafter, keeping argon
Throughput controls 250~350L/min, and molten steel exposes the top of the slag, is vacuum-treated 30~35 minutes；
Step 6: secondary adduction gold works as H:1.0ppm, activity oxygen a (O): is heated up and be added again silico-calcium after 5.9ppm
Ladle is moved back to heating station by alloy, is warming up to 1625 DEG C, is added calcium-silicon 50kg, adjustment argon flow to 60L/min,
Soft blow 10min, hangs out；
Step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting carries out 2 external drainages to refining water-coating port, sliding
Plate Argon when vacuum tank is evacuated to 65Pa or less, opens water-gap pouring, while argon blowing by ladle seat on vacuum tank,
Argon pressure 1MPa, according to molten steel diffusing situation, appropriate adjustment Argon pressure to 0.8MPa, pouring molten steel to riser target position
Afterwards, close the mouth of a river, destroy vacuum, be added first exothermic mixture 50kg, ladle call away after by sieve addition second batch exothermic mixture
250kg is demoulded after 26 hours, hot sending to forge.
Embodiment two
Other contents of the present embodiment are the same as example 1, the difference is that: in step 7, suitable carbonization is added
Rice husk is as coverture.Make better quality after molding by adding coverture.
The present invention is suitable for a kind of manufacturing method of low aluminium control silicon steel large steel ingot, using the low of manufacturing method of the present invention manufacture
Aluminium control silicon steel large steel ingot, ingredient all meet code requirement, and Al content is controlled 0.05% or so, and Molten Steel Cleanliness substantially mentions
It rises, oxygen content is reduced to 10ppm from previous 20ppm, and C type impurity content is reduced to 0.5~1 by previous 1~1.5 grade
Grade, remaining a few type impurity content reduce straight 0~0.5 grade by 0.5~1 grade, and flaw detection qualification rate less than 80% by being promoted in the past
95% or more.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (7)
1. a kind of manufacturing method of low aluminium control silicon steel large steel ingot, which is characterized in that the manufacturing method includes the following steps:
Step 1: this steel grade is added into electric furnace and returns to 78 tons of material, 25 tons of conversion pig and ferrosilicon 500kg for electric furnace ingredient；
Step 2: electric furnace smelting drops to 0.15% when P class sundries content drops to 0.004%, C class sundries content, and temperature is big
When 1650 DEG C, EBT carries out card slag and puts steel into refining packet；
Step 3: after refining packet enters the station, C powder, silicon calcium powder, pulverized limestone and fluorite is added in refining, and maximum power energization slugging is gone back
Original adds aluminium powder and carbon dust ten minutes later, continues heating reduction 30 minutes；
Step 4: preliminary adduction gold, thermometric, sampling are warming up to 1650 DEG C, alloy in addition to silicon are added, after being warming up to 1650 DEG C,
Ferrosilicon is added；
Step 5: being vacuum-treated, and ladle is moved to vacuum station and is vacuum-treated, and vacuum degree is down to 133Pa hereinafter, keeping argon gas stream
Amount 250~350L/min of control, molten steel expose the top of the slag, are vacuum-treated 30~35 minutes；
Step 6: ladle is moved back to heating station, is warming up to 1625 DEG C, calcium-silicon 50kg is added, adjusts argon by secondary adduction gold
Throughput is hung out to 60L/min, soft blow 10min；
Step 7: refining packet vacuum argon blowing refining packet vacuum argon blowing casting carries out 2 external drainages, sliding plate blowing to refining water-coating port
Argon when vacuum tank is evacuated to 65Pa or less, opens water-gap pouring, while argon blowing, argon gas by ladle seat on vacuum tank
Pressure 1MPa after pouring molten steel to riser target position, closes the mouth of a river, destroys vacuum, first exothermic mixture 50kg, ladle is added
Second batch exothermic mixture 250kg is added by sieve after calling away, is demoulded after 26 hours, hot sending to forge.
2. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 2,
Pre-deoxidant is added during putting steel: slag charge: 500kg lime is added in the calcium-silicon of 1.5kg/t steel.
3. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1 or 2, which is characterized in that step 2
In, there is slag phenomenon when putting steel process, refining furnace, which does not restore, is warming up to 1620 DEG C or more, carries out converting packet card slag operation.
4. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 3, C
Powder weight is 50kg, and silicon calcium powder weight is 150kg, and pulverized limestone weight is 1600kg, and fluorite weight is 700kg.
5. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 4, which is characterized in that in step 3,
Aluminium powder weight is 30kg, and carbon dust weight is 50kg.
6. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 6,
Work as H:1.0ppm, activity oxygen a (O): is heated up and be added again calcium-silicon after 5.9ppm.
7. a kind of manufacturing method of low aluminium control silicon steel large steel ingot according to claim 1, which is characterized in that in step 7,
Suitable carbonization rice husk is added as coverture.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534665A (en) * | 2020-06-30 | 2020-08-14 | 上海电气上重铸锻有限公司 | Pouring method of large vacuum steel ingot |
| CN113025923A (en) * | 2021-02-02 | 2021-06-25 | 攀钢集团江油长城特殊钢有限公司 | Low-aluminum low-oxygen alloy steel and preparation method thereof |
| CN113560509A (en) * | 2021-07-27 | 2021-10-29 | 上海电气上重铸锻有限公司 | Method for manufacturing low-silicon boron-controlled steel large steel ingot |
| CN114182065A (en) * | 2021-12-08 | 2022-03-15 | 上海电气上重铸锻有限公司 | Manufacturing method of hundred-ton-grade large steel ingot of ultralow-nitrogen silicon steel |
| CN116254451A (en) * | 2022-12-09 | 2023-06-13 | 上海电气上重铸锻有限公司 | Manufacturing method of steel ingot for spent fuel dry storage container and forging |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111534665A (en) * | 2020-06-30 | 2020-08-14 | 上海电气上重铸锻有限公司 | Pouring method of large vacuum steel ingot |
| CN111534665B (en) * | 2020-06-30 | 2022-02-01 | 上海电气上重铸锻有限公司 | Pouring method of large vacuum steel ingot |
| CN113025923A (en) * | 2021-02-02 | 2021-06-25 | 攀钢集团江油长城特殊钢有限公司 | Low-aluminum low-oxygen alloy steel and preparation method thereof |
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| CN114182065A (en) * | 2021-12-08 | 2022-03-15 | 上海电气上重铸锻有限公司 | Manufacturing method of hundred-ton-grade large steel ingot of ultralow-nitrogen silicon steel |
| CN116254451A (en) * | 2022-12-09 | 2023-06-13 | 上海电气上重铸锻有限公司 | Manufacturing method of steel ingot for spent fuel dry storage container and forging |
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