CN105349731B - The method of refining of high-quality scraping cylinder body steel - Google Patents
The method of refining of high-quality scraping cylinder body steel Download PDFInfo
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- CN105349731B CN105349731B CN201510896951.6A CN201510896951A CN105349731B CN 105349731 B CN105349731 B CN 105349731B CN 201510896951 A CN201510896951 A CN 201510896951A CN 105349731 B CN105349731 B CN 105349731B
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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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Abstract
The invention discloses a kind of method of refining of high-quality scraping cylinder body steel, the method technological process is electric furnace → LF refining → Ca treatment → VD applications of vacuum, the alloy of methods described requirement more than 80% is added in electric furnace steel tapping, forbid feeding Al lines in 15min before LF tappings, Ca lines are fed before VD applications of vacuum carries out Ca treatment.Using this process, LF stove alloy additions are reduced, it is ensured that LF refining deaeration time and the sufficient floating interval of floating dock of field trash, improve purity of steel and production efficiency；Small using the A classes of the scraping cylinder body steel of this technique productions, C classes, B classes, D classes, Ds type impurity sizes, technology stability is good.
Description
Technical field
The present invention relates to the technical field of smelting of scraping cylinder body steel, and in particular to a kind of high-quality scraping cylinder body steel
Method of refining.
Background technology
In recent years, with the change of oil cylinder processing mode, from original in take off outside boring and be changed into that " essence pulls out+inner surface scraping+outer surface
Finishing " mode is produced, and user pulls out the requirement of inside and outside surface quality, dimensional tolerance and the purity of steel of oil cylinder pipe to essence
More and more higher.
Such oil cylinder delivered goods with pipe hot rolling after by cold-drawing technology, and outer surface of steel tube after cold-drawn is finished, it is interior
Surface carries out shaving action, and its processing mode is high to purity of steel requirement, and each type impurity grading is required to less than 1.5
Steel pipe surfaces externally and internally not may occur in which inclusion defect after level, and processing.
The content of the invention
Instant invention overcomes the deficiencies in the prior art, there is provided a kind of method of refining of high-quality scraping cylinder body steel.
In view of the above mentioned problem of prior art, according to one side disclosed by the invention, the present invention uses following technology
Scheme：
A kind of method of refining of high-quality scraping cylinder body steel, described method of refining is comprised the following steps：
A, electric furnace smelting
Being added during electric furnace steel tapping always needs 80~90% and Al of alloying element quality to carry out deoxidation of molten steel；
B, LF refining
After molten steel enters LF refining furnace, to synthetic slag 12~20kg/t steel is added in ladle, when the synthetic slag for adding melts
After the completion of change, refined to 0.8~2kg/t steel high efficiency deoxidisers are added in ladle, then to adding quartz sand in ladle
Carry out residue adjustment；
Sampling analysis chemical composition after LF refining slag bleaches, while remaining alloy is added in LF refining furnace carrying out
Refining, mends according to the Al content detected in refining first sample and feeds Al lines, forbids feeding Al in the outbound preceding 15mim of LF refining furnace molten steel
Line；
C, Ca handling process
Ca before processings adjust ladle bottom Argon amount, and Ca-Si 0.6~0.8kg/t steel or complex Ca silk are fed after adjustment
0.12~0.15kg/t steel carries out Calcium treatment, and VD applications of vacuum are carried out again after Ca treatment；
D, VD application of vacuum
In VD vacuum process, it is less than under 67Pa in vacuum, keeps more than process time 15min.
Further technical scheme：The quality that alloying element need to be always added in described step A is 15~20kg/t steel.
Further technical scheme：Alloying element includes Mn, Nb in described step A.
Further technical scheme：High efficiency deoxidiser includes calcium carbide, carborundum, ferrosilicon powder, Al in described step B
Powder.
Principle to technology contents of the invention is described below：
The alloying element of the smelting more than 80% of general steel is added in LF refining furnace refining process.Application claims 80%
Alloying element above is added in electric furnace steel tapping, its Main Function：The strong mixed of one molten steel when being using electric furnace steel tapping flushes
Mix, remove steel inclusion, two is the addition for mitigating LF alloys, it is ensured that deaeration time and inclusion floating time are abundant.
It is required that forbid feeding Al lines in 15min before LF tappings, primarily to preventing from changing after adding Al because of the LF refining later stage
Deoxidation equilibrium, prevents the LF refining later stage from generating the tiny Al of disperse2O3Field trash cannot float removal.
The effect that Ca Wiring technologies are fed before VD applications of vacuum is that Ca treatment makes the Al of disperse2O3It is mingled with denaturation to be mingled with for spherical,
Allow it is spherical be mingled with sufficient floating interval of floating dock, prevent nozzle clogging.Calcium treatment energy is carried out using Ca lines are fed before VD applications of vacuum
Reduce the probability of B classes, D classes and Ds type impurities appearance in steel pipe.
Feed to forbid mending in the preceding 15min of technique and LF refining furnace tapping of Ca lines before VD applications of vacuum and feed Al Wiring technologies, its
Major technique is to try one's best to reduce the tiny Al of disperse in the LF refining later stage2O3The formation being mingled with, the spherical folder for allowing Ca to be formed after processing
It is miscellaneous few, and there is sufficient time aggregation to grow up, the more big easier floating of field trash prevents nozzle clogging and reduces B classes, D classes
With the appearance of Ds type impurities.
Compared with prior art, one of beneficial effects of the present invention are：
1st, LF stove alloy additions are reduced, it is ensured that deaeration time and inclusion floating time fully, and improve production effect
Rate；
2nd, the oil cylinder using this technique productions is small with B classes, D classes, Ds type impurity sizes in steel its steel, and quantity is few, product
Process for machining good stability.
Specific embodiment
The present invention is described in further detail with reference to embodiment, but embodiments of the present invention not limited to this.
A, electric furnace smelting
Smelted during steel scrap, pig iron material are added into electric furnace；
Being added during electric furnace steel tapping always needs the 80~90% of alloy mass to carry out alloying, and it is pre- that addition Al carries out molten steel
Deoxidation, controls Al content for 0.06~0.08%, is that LF refining slag making, deoxidation, desulfurization removal are mingled with and create conditions；
B, LF refining
After ladle enters LF refining station, to synthetic slag 12~20kg/t steel is added in ladle, when the synthetic slag for adding melts
After having changed, then to adding 0.8~2kg/t steel high efficiency deoxidisers to be refined in ladle, then adjusted to addition quartz sand in ladle
Slag, proceeds heating；
Sampling analysis chemical composition after refining slag bleaches, and remaining alloying element is added in LF refining furnace carries out
Refining, mends according to the Al content detected in refining first sample and feeds Al lines, it is ensured that molten steel Al content >=0.02%, in LF refining furnace molten steel
Forbid feeding Al lines in outbound preceding 15mim；
At the same time, ladle ladle bottom Argon during LF refining furnace is refined, when liquid steel temperature reaches 1645 DEG C
To after 1665 DEG C, molten steel is outbound；
C, Ca PROCESS FOR TREATMENT
After LF refining tapping, ladle is hung in into VD operations carries out Ca treatment；
Meanwhile, Ca before processings adjustment ladle bottom argon blowing rate and Argon intensity, molten steel produces big boiling when preventing Ca from processing
Rise, secondary oxidation and air-breathing, fed after the adjustment of ladle bottom argon gas Ca-Si 0.6~0.8kg/t steel or complex Ca thread 0.12~
0.15kg/t steel；
D, VD application of vacuum
VD applications of vacuum are carried out again after Ca treatment；
In VD vacuum process, more than process time 15min is kept in the case where vacuum is less than 67Pa；
Ladle enters continuous casting working procedure after VD applications of vacuum.
The quality that alloy need to be always added in described step A is 15~20kg/t steel.
Alloying element includes Mn, Nb in described step A.
High efficiency deoxidiser includes calcium carbide, carborundum, ferrosilicon powder, Al powder in described step B.
Embodiment
A kind of method of refining of high-quality scraping cylinder body steel, according to one embodiment of present invention, described refining side
Method is comprised the following steps：
A, electric furnace smelting
Smelted during steel scrap, pig iron material are added into electric furnace；
Being added during electric furnace steel tapping always needs 80~90% and Al of alloy mass to carry out deoxidation of molten steel, it is preferable that institute
The addition for stating alloy mass is 80%；
B, LF refining
After ladle enters LF refining station, to synthetic slag 12~20kg/t steel is added in ladle, when the synthetic slag for adding melts
After having changed, refined to 0.8~2kg/t steel high efficiency deoxidisers are added in ladle, then entered to addition quartz sand in ladle
Row residue adjustment, proceeds heating, it is preferable that the addition of the synthetic slag is 12kg/t steel, the addition of the high efficiency deoxidiser
It is 1kg/t to measure；
Sampling analysis chemical composition after refining slag bleaches, and remaining alloy is added in LF refining furnace carries out essence
Refining, mends according to the Al content detected in refining first sample and feeds Al lines, and forbid feeding in the outbound preceding 15mim of LF refining furnace molten steel
Al lines；
At the same time, ladle ladle bottom Argon during LF refining furnace is refined, when liquid steel temperature reaches 1645 DEG C
To after 1665 DEG C, molten steel is outbound, it is preferable that outbound liquid steel temperature is 1650 DEG C；
C, Ca handling process
After LF refining tapping, ladle is hung in into VD operations carries out Ca treatment；
Meanwhile, Ca before processings are adjusted to ladle bottom argon blowing rate and intensity, are fed after adjustment ladle bottom argon gas
Ca-Si 0.6~0.8kg/t steel or complex Ca silk 0.12~0.15kg/t steel；
D, VD application of vacuum
VD applications of vacuum are carried out again after Ca treatment；
In VD vacuum process, more than process time 15min is kept in the case where vacuum is less than 67Pa；
Ladle enters continuous casting working procedure after VD applications of vacuum.
The quality of alloy need to be always added in described step A for 15~20kg/t steel, preferably 16kg/t steel.
Alloying element includes Mn, Nb in described step A.
High efficiency deoxidiser includes calcium carbide, carborundum, ferrosilicon powder, Al powder in described step B.
The oil cylinder pipe non-metallic inclusion grading situation that this technique productions is not used is shown in Table 1.
Table 1
The oil cylinder pipe non-metallic inclusion grading situation produced using present invention process is shown in Table 2.
Table 2
Knowable to Tables 1 and 2, the fluctuation of the non-metallic inclusion of non-invention technique productions is larger, and inclusion size compared with
Greatly, Ds reaches 3 grades；The non-metallic inclusion content of present invention process production is low, fluctuation very little, and inclusion size is smaller, A
Carefully system is 0 grade for class, C classes, and carefully system is 0.5 grade to B classes, and carefully system is 1 grade to D classes, and slightly system is 0 grade to A, B, C, D class, and Ds classes are 0.5 grade.
Each embodiment is described by the way of progressive in this specification, and what each embodiment was stressed is and other
The difference of embodiment, identical similar portion cross-reference between each embodiment.
Than that described above, in addition it is also necessary to explanation, " one embodiment ", " another reality spoken of in this manual
Apply example ", " embodiment " etc., it is general that specific features, structure or the feature for referring to being described with reference to the embodiment are included in the application
In at least one embodiment of including property description.In the description multiple places occur statements of the same race be not necessarily refer to it is same
Embodiment.Furthermore, it is understood that when describing specific features, structure or a feature with reference to any embodiment, what is advocated is
Realize that this feature, structure or feature also fall within the scope of the present invention with reference to other embodiment.
Although reference be made herein to invention has been described for multiple explanatory embodiments of the invention, however, it is to be understood that
Those skilled in the art can be designed that a lot of other modification and implementation methods, and these modifications and implementation method will fall in this Shen
Please be within disclosed spirit and spirit.More specifically, in the range of disclosure and claim, can be to master
The building block and/or layout for inscribing composite configuration carry out various variations and modifications.Except what is carried out to building block and/or layout
Outside variations and modifications, to those skilled in the art, other purposes also will be apparent.
Claims (1)
1. a kind of method of refining of high-quality scraping cylinder body steel, it is characterised in that：Described method of refining is comprised the following steps：
A, electric furnace smelting
Smelted during steel scrap, pig iron material are added into electric furnace；
Being added during electric furnace steel tapping always is needed the 80~90% of alloy mass to carry out alloying, and molten steel is pre- to be taken off to add Al to carry out
Oxygen, controls Al content for 0.06~0.08%, is that LF refining slag making, deoxidation, desulfurization removal are mingled with and create conditions；
B, LF refining
After ladle enters LF refining station, to synthetic slag 12~20kg/t steel is added in ladle, when the synthetic slag for adding has melted
Afterwards, then to adding 0.8~2kg/t steel high efficiency deoxidisers to be refined in ladle, then to addition quartz sand residue adjustment in ladle, after
It is continuous to be heated；
Sampling analysis chemical composition after refining slag bleaches, and remaining alloying element is added in LF refining furnace carries out essence
Refining, mends according to the Al content detected in refining first sample and feeds Al lines, it is ensured that molten steel Al content >=0.02%, goes out in LF refining furnace molten steel
Forbid feeding Al lines in 15mim before standing；
At the same time, ladle ladle bottom Argon during LF refining furnace is refined, when liquid steel temperature reaches 1645 DEG C extremely
After 1665 DEG C, molten steel is outbound；
C, Ca PROCESS FOR TREATMENT
After LF refining tapping, ladle is hung in into VD operations carries out Ca treatment；
Meanwhile, Ca before processings adjustment ladle bottom argon blowing rate and Argon intensity, molten steel produces big boiling, two when preventing Ca from processing
Secondary oxidation and air-breathing, fed after the adjustment of ladle bottom argon gas Ca-Si 0.6~0.8kg/t steel or complex Ca thread 0.12~
0.15kg/t steel；
D, VD application of vacuum
VD applications of vacuum are carried out again after Ca treatment；
In VD vacuum process, more than process time 15min is kept in the case where vacuum is less than 67Pa；
Ladle enters continuous casting working procedure after VD applications of vacuum；
The quality that alloy need to be always added in described step A is 15~20kg/t steel；
Alloying element includes Mn, Nb in described step A；
High efficiency deoxidiser includes calcium carbide, carborundum, ferrosilicon powder, Al powder in described step B.
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