CN106756475B - Medium-high frequency driving motor 0.27mm thickness non-orientation silicon steel and production method - Google Patents
Medium-high frequency driving motor 0.27mm thickness non-orientation silicon steel and production method Download PDFInfo
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Abstract
Medium-high frequency driving motor 0.27mm thickness non-orientation silicon steel, component and wt%:C :≤0.0028%, Si:2.61~3.05%, Al:1.05~1.48%, Mn:0.22~0.48%, Sn:0.14 ~ 0.49%, P≤0.022%, S:0.0015~0.0029%, N:0.001~0.0025%.Production method: with vacuum induction furnace smelting and ingot of casting；It is heated after cogging；Hot rolling；Normalizing；Pickling；Cold rolling；Finished products；Cooling, shearing, sample preparation, magnetic and mechanical performance measure.The present invention is guaranteeing magnetic property P1.0/400≤ 13.5w/kg, B5000Under the premise of >=1.65T, the index for taking into account mechanical performance compares by force 0.74 ~ 0.78, is able to satisfy the requirement of manufacture medium-high frequency driving motor iron core.
Description
Technical field
The present invention relates to a kind of non-orientation silicon steel and its production method, the nothing for medium-high frequency driving motor is specifically belonged to
Orientation silicon steel and production method.
Background technique
As electric car (EV) and hybrid automobile (HEV) electronic product are to miniaturization, high precision int, high efficiency side
To development, it is desirable that the electromagnetic property that the electric steel plate of production motor iron core must have low iron loss and high magnetic flux density etc. excellent,
Especially thin gauge, high magnetic strength, low iron loss, coating quality and in terms of have higher requirement.But mesh
Preceding process means are difficult to obtain the magnetic product to meet the requirements during reducing thickness, and main performance is exactly that production is difficult
Degree is big, lumber recovery is low, magnetic difference.
Driving motor requires non-oriented electrical steel to include 1, thin gauge, to meet low-loss requirement；2, low iron loss, to protect
Temperature is no more than specified value when demonstrate,proving high speed rotation；3, high magnetic strength, to mitigate its weight and volume.4, mechanical performance is moderate, should
The requirement that intensity cannot be too low when intensity cannot meet motor high speed rotation too high, again when meeting high speed punching.
Through retrieving: the day of entitled " non-oriented electrical steel and its manufacturing method that have low iron loss and excellent processing characteristics "
Patent document, it discloses chemical constituent and wt% are as follows: Si:1.5 ~ 2.5%, Al:1.0 ~ 3.0%, Si+Al:3.5 ~ 5.0%,
Mn :≤1.0%, C≤0.010%, S+N+Ti≤0.006%, remaining is Fe and remnants.It requires Al (%) >=Si (%), by 900 ~
1200 DEG C × 20 ~ 300s normalizing, 70 ~ 85% cold rolling under, the finished products of 900 ~ 1000 × 10 ~ 120s No yield point electricity is made
Magnetic steel plate strip.The each element content range of the document is larger, and purity of steel requires height, and heat treatment process range is excessively wide
It is general, the preferable non-oriented magnetic steel sheet strip of frequency performance is obtained by adjusting annealing temperature and atmosphere, is primarily directed to
The control of surface microhardness is not described the magnetic property of the promotion especially medium-high frequency of performance.
The Japanese documentation of entitled " the non-oriented magnetic steel sheet strip and its manufacturing method of excellent magnetic ", disclosure
Chemical constituent and wt% are as follows: Si:0.7 ~ 1.7%, Al:1.6 ~ 2.5%, Si+Al:2.5 ~ 3.7%, Mn:0.10 ~ 0.50%, C:
≤ 0.005%, S :≤0.004%, remaining is Fe and remnants.Non-oriented magnetic steel sheet strip is obtained by common process.The document
Silicon content it is lower, due to normalizing temperature need >=950 DEG C, influence the later period rolling, therefore require cold rolling maximum temperature >=
150 DEG C, there is increase rolling difficulty and energy consumption controls.Its final acquisition B5000/ Bs >=0.83, P1.5/50The magnetic of≤2.5W/kg
Property.Cold rolling load is big in production, uneconomical.
The Japan Patent of entitled " non-oriented electrical steel and its manufacturing method that have low iron loss and suitable processing performance "
Document, it discloses chemical constituent and wt% are as follows: C≤0.010%, Mn:0.05 ~ 1.5%, Si+Al:1.5 ~ 4.0%, remaining for Fe and
It is remaining.Its technique is cold rolled annealed rear crystallite dimension≤50 μm, makes crystalline substance by stress relief annealing (920 ~ 1020 DEG C × 60s or more)
Grain length is big, obtains fine magnetic property.The document needs subsequent stress relief annealing, and the temperature of stress relief annealing is also relatively high,
Increase popularization difficulty.
The Japanese documentation of entitled " a kind of manufacturing method of cold rolling non-orientation silicon steel thin belt ", it discloses chemistry at
Point and wt% are as follows: C :≤0.005%, Si :≤1.0%, Mn:1.0 ~ 2.5%, P :≤0.15%, Al:1.5 ~ 3.5%, and Mn/Al:0.5 ~
0.8, remaining is Fe and inevitable impurity, handles and is made through overpickling, normalizing and annealing after cold rolling.The document is based on high Si
It with high Al-Mn ingredient, adjusts magnetic density and improves magnetic property, while also reducing production cost.But without improving specific performance
Situation, medium-high frequency performance also do not refer to.
The Japanese documentation of entitled " a kind of high working property energy cold rolling non-orientation silicon steel thin belt and its manufacturing method ",
Disclose chemical component and wt% are as follows: C :≤0.010%, Si:0.1 ~ 4%, Mn:0.5 ~ 1.5%, Al:0.1 ~ 4%, and Si+Mn+Al:
0.7 ~ 5%, S :≤0.0040%, Ti :≤0.0025%, remaining is Fe and inevitable impurity.Crystallite dimension is adopted up to 50 μm
With method intermediate annealing process twice, finished products temperature is at 700 ~ 950 DEG C.The range is very wide in range, refers to without clearly performance
Mark.
The Japan of entitled " a kind of low iron loss, excellent processing characteristics cold rolling non-orientation silicon steel thin belt and its manufacturing method " is specially
Sharp document, it discloses chemical component and wt% are as follows: C :≤0.010%, Si:0.1 ~ 4%, Mn:0.1 ~ 1.5%, Al:0.1 ~ 4%, and
Si+Mn+Al:0.7 ~ 5%, S :≤0.0040%, REM:0.0005 ~ 0.0020%, remaining is Fe and inevitable impurity.Crystal grain
Size≤50 μm, using method intermediate annealing process twice, finished products temperature is at 700 ~ 950 DEG C.It also needs answer after punching
Power annealing increases user and promotes difficulty, and compositional ranges are excessively wide in range.
The Japan Patent of entitled " cold rolling non-orientation silicon steel thin belt of excellent magnetic easy processing after a kind of stress relief annealing "
Document, it discloses chemical component and wt% are as follows: C :≤0.010%, Si:1.5 ~ 2.5%, Mn:0.5 ~ 2.0%, Al:1.0 ~ 3.0%,
And Si+2Al-Mn: >=2%, S :≤0.0040%, Ti :≤0.0020%, remaining is Fe and inevitable impurity, can also be added
Add Sn:0.02 ~ 0.04% and Cu:0.1 ~ 1.0%.Vickers hardness at crystallite dimension≤100 μm≤180,750 DEG C × 2h destressing
10% or more growth is had after annealing.It yet needs to carry out stress relief annealing after punching, increases user and promote difficulty, and composition
Range is excessively wide in range.
Entitled " a kind of to roll to the cold rolling non-orientation silicon steel thin belt manufacturing method excellent with longitudinal magnetic performance " Japan
Patent document, it discloses chemical component and wt% are as follows: C :≤0.002%, Si:0.1 ~ 0.8%, Mn:0.1 ~ 1.5%, Al:0.3 ~
2.0%, and Si+2Al-Mn: >=2%, S :≤0.0020%, N :≤0.0020%, Ti :≤0.0020%, remaining is Fe and can not keep away
The impurity exempted from, wherein V :≤0.003%, Zr :≤0.003%, Nb :≤0.003%, As≤0.003%.In average crystal grain ruler after normalizing
It is very little >=300 μm, reduction ratio 85 ~ 95% when cold rolling, be made after 700 ~ 950 DEG C × 10 ~ 60s of finished products roll to longitudinal flux
The excellent non-orientation silicon steel of performance.Range is excessively wide in range in patent, fails to symbolize actual performance.
In the prior art, the magnetic property of the thin non-orientation silicon steel of used in high-speed motor is used to prepare with P1.0/400And B5000
The quality of the magnetic property of the height characterization non-orientation silicon steel of value.The present patent application will propose a kind of compositional ranges more with regard to this index
To be accurate, more excellent performance of cold rolling non-orientation silicon steel and its production method.
Summary of the invention
The invention reside in the shortcomings of the prior art is overcome, it is more accurate to provide a kind of compositional ranges, magnetism (P1.0/400
≤ 13.5w/kg, B5000The excellent i.e. yield tensile ratio of >=1.65T, processing performance is used in 0.74 ~ 0.78 medium-high frequency driving motor
0.27mm thickness non-orientation silicon steel and production method.
Realize the measure of above-mentioned purpose:
Medium-high frequency driving motor 0.27mm thickness non-orientation silicon steel, component and weight percent content are as follows: C :≤
0.0028%, Si:2.61~3.05%, Al:1.05~1.48%, Mn:0.22~0.48%, Sn:0.14 ~ 0.49%, P≤0.022%,
S:0.0015~0.0029%, N:0.001~0.0025%, remaining is Fe and inevitable impurity；And control simultaneously: C+S
+ N+O total amount≤0.010%, Si+Mn+Al+Sn total amount 4.34~5.20%, Mn/S 100~320, Al/N 600~
980。
Method of the medium-high frequency driving motor with 0.27mm thickness non-orientation silicon steel is produced, step:
1) smelted and ingot of casting, controlled in endpoint molten steel using vaccum sensitive stove: C+S+N+O total amount 0~
0.010%, Si+Mn+Al+Sn total amount are in 4.34~5.20%, Mn/S in 100~320, Al/N 600~980；
2) heat after cogging: control heating temperature keeps the temperature 45~75min at 910~960 DEG C at this temperature；
3) hot rolling is carried out, controls finish rolling finishing temperature at 780~820 DEG C；It is hot-rolled down to 2.0~2.5mm of plate thickness；
4) carry out normalizing: normalizing heating and temperature control keeps the temperature 3~5min at 920~960 DEG C at this temperature；
5) carry out pickling: acid liquor temperature is controlled at 82~92 DEG C；
6) carry out cold rolling: cold rolling adds up reduction ratio control 85~90%, and finished product thickness is in 0.27 ± 0.010mm；
7) finished products are carried out: in H2: N2It being carried out in the gaseous mixture of=1:1, annealing temperature is controlled at 880 ~ 990 DEG C, and
150~250s is kept the temperature under this annealing temperature；
8) it routinely carries out cooling down, shear, sample preparation, the measurement of magnetic and mechanical performance.
It is: finished products temperature according to:
T=837+(2.1×107) × [S] × [N] calculate,
In formula: T-expression finished product annealing temperature, unit are as follows: DEG C,
The content of sulphur in S-expression finished steel plate, is calculated using pure decimal,
The content of nitrogen in N-expression finished steel plate, is calculated using pure decimal.
The effect and main points of processes control of each element in the present invention:
C: magnetic aging, caused iron on the one hand can be generated in use when content is more than 0.0028% for harmful element
Damage deteriorates；On the other hand more carbon will increase the cost of decarburization, it is therefore necessary to which control is ≤0.0028%.
Si: the resistivity of finished product can be increased and reduce iron loss；But Si content increase will lead to cold rolling difficulty and reduce
Magnetic strength, therefore, the high frequency performance to guarantee qualified need to control the content of Si between 2.61~3.05%.
Al: it is the same with Si to increase resistivity, iron loss is reduced, also there is certain deterioration to magnetic strength, therefore, the content of Al
Control is in 1.05~1.48% ranges；The content of this patent Al is more than the conventional trade mark, mainly considers from the following aspects
's.First, plus Al be conducive to annealing after coarse grains and finished product texture improve, reduce iron loss；Second, plus Al ratio add Si have phase
To lesser processing hardening, advantageously reduces cold rolling edges of boards and split；Third, plus Al be conducive to improve silicon steel sheet punching processability.
In addition, because the disperse educt of AlN can hinder crystal grain to grow up during finished products, and N is the impurity not being completely removed
Element, it is therefore desirable to which Al/N control is between 600~980；Preferably, Al/N control is between 740~840.
Mn: can improve hot rolled plate tissue and texture, and (100) and (110) component is promoted to reinforce, and (111) component weakens, to mentioning
It is high magnetic advantageous；Mn is easy to form MnS with S, and coarse MnS is conducive to crystal grain and grows up reduce iron loss；Manganese is that γ phase region forms member
Element, excessive manganese can reduce ferrite area, reduce finished products temperature and are unfavorable for growing up for crystal grain, therefore Mn content exists
0.22%~0.48%.In addition, because the disperse educt of MnS can hinder crystal grain to grow up during finished products, and S be can not be complete
The impurity element removed entirely, it is therefore desirable to which Mn/S control is between 100~320；Preferably, Mn/S control 150~250 it
Between.
Sn: easily in grain boundaries segregation, the reinforcement of (100) [uvw] component and grain coarsening can be made and hinder (111) recrystallization brilliant
The formation of core, so as to improve magnetism；But content is more than that 0.15% can crack in cold rolling, and will increase cost, therefore Sn
Content is 0.14%~0.49%.
Main alloy element of the invention is silicon, manganese, aluminium and tin, is the necessary condition for guaranteeing end properties.Why will
Si+Mn+Al+Sn is limited in 4.34 ~ 5.20% ranges, exactly because silicon, manganese, aluminium and tin can not only reduce high frequency iron loss, it is desirable that
The sum of its content >=4.34%, so that P1.0/400≤13.5w/kg；Magnetic strength is also reduced simultaneously, it is desirable that the sum of its content≤5.20%,
So that B5000≥1.65T；In addition, the material for medium-high frequency rotating electric machine is also required for certain intensity and has appropriate bend
Strong ratio, guarantees punching processing performance.
Carbon, sulphur, nitrogen, oxygen: being impurity element of the invention, unfavorable to magnetic property, needs strictly to control, therefore it is required that 0 <
C+S+N+O≤0.010%.
Phosphorus is residual elements, unfavorable to magnetic property, it is desirable that control P≤0.022%.
In terms of technology controlling and process:
The present invention why by the cogging heating temperature of steel ingot be designed as 910~960 DEG C, soaking time control 45~
75min, primary concern is that on the one hand grilling thoroughly steel ingot, i.e., hot to 910 DEG C or more, heat preservation 45min or more；On the other hand to the greatest extent
Amount reduces scaling loss and control MnS, AlN and Cu2The solid solution of the second phase particles such as S.
The present invention why by hot rolling heating and temperature control at 880~920 DEG C, keep the temperature 50~70min, be primarily due to low
In 880 DEG C, hot mill rolling pressure is big, it is difficult to roll target thickness；Higher than 920 DEG C, it is easy that MnS, AlN and Cu is precipitated2S etc.
Secondary phase particle, it is unfavorable to properties of product；Soaking time control in 50~70min, primarily to convenient for each ingredient comparison and
Control the needs of Solid Solution of Second Phase Particles amount；Why by finishing temperature control at 780~820 DEG C, mainly be lower than 780 DEG C,
Because draught pressure is difficult to roll target thickness greatly；It is also easy to produce more iron scale higher than 820 DEG C, is unfavorable for the acid of rear process
It washes.
The present invention why by normalizing heating and temperature control at 920~960 DEG C, keep the temperature 3~5min, be primarily due to temperature
Lower than 920 DEG C and soaking time is less than 3min, cannot reach microstructure homogenization；Temperature is higher than 960 DEG C and soaking time is greater than
5min, the rolling being not only easy after second phase particles are precipitated but also causes energy waste or is unfavorable for.
Why cold rolling is added up reduction ratio control 85~90%, mainly by raw thickness and finished product thickness by the present invention
Constraint.Reduction ratio is too small, and rolling pass is more, and finished product template is bad instead；It is unfavorable for being formed and the advantageous cold rolling of magnetic property is become
Shape texture.
Why the present invention controls finished products temperature at 880~990 DEG C, 150~250s is kept the temperature, because temperature is lower than
880 DEG C are less than 150s with soaking time, can make recrystal grain is smaller to be unfavorable for reducing iron loss；Temperature is higher than 990 DEG C and heat preservation
Time is greater than 250s, then the grain size of finished product tissue is excessive unfavorable to punching.Its annealing temperature page can be according in ingredient
[S], [N] content, according to annealing temperature T [DEG C]=837+ (2.1 × 107) × [S] × [N] calculate its annealing temperature.It is testing
Middle discovery, [S], [N] content height can generate relatively large number of MnS, AlN and Cu in hot rolling2The second phase particles such as S, need more
High annealing temperature promotes crystal grain to grow up.
The present invention is by ingredient (Si+Mn+Al+Sn, Mn/S, the Al/N) control in smelting process, exactly in order to sufficiently send out
Wave advantageous effect of the main alloy element in Physical Metallurgy；Pass through strict control impurity element total amount and process optimization, production
A kind of medium-high frequency driving motor non-oriented electrical steel that magnetic property and processing performance are taken into account out.On the one hand medium-high frequency can be reduced
Iron loss improves magnetic strength realization and has excellent magnetic characteristics；On the other hand guarantee that production board has yield tensile ratio appropriate, meets user's punching and adds
The needs of work.
Compared with prior art, the present invention guaranteeing magnetic property P1.0/400≤ 13.5w/kg, B5000Under the premise of >=1.65T,
The index for taking into account mechanical performance compares by force 0.74 ~ 0.78, is able to satisfy the requirement of manufacture medium-high frequency driving motor iron core.
Specific embodiment
The present invention is described in detail below:
Table 1 is the comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example；
Table 3 is various embodiments of the present invention and comparative example performance text list.
Various embodiments of the present invention produce according to the following steps:
1) smelted and ingot of casting, controlled in endpoint molten steel using vaccum sensitive stove: C+S+N+O total amount 0~
0.010%, Si+Mn+Al+Sn total amount are in 4.34~5.20%, Mn/S in 100~320, Al/N 600~980；
2) heat after cogging: control heating temperature keeps the temperature 45~75min at 910~960 DEG C at this temperature；
3) hot rolling is carried out, controls finish rolling finishing temperature at 780~820 DEG C；It is hot-rolled down to 2.0~2.5mm of plate thickness；
4) carry out normalizing: normalizing heating and temperature control keeps the temperature 3~5min at 920~960 DEG C at this temperature；
5) carry out pickling: acid liquor temperature is controlled at 82~92 DEG C；
6) carry out cold rolling: cold rolling adds up reduction ratio control 85~90%, and finished product thickness is in 0.27 ± 0.010mm；
7) finished products are carried out: in H2: N2It being carried out in the gaseous mixture of=1:1, annealing temperature is controlled at 880 ~ 990 DEG C, and
150~250s is kept the temperature under this annealing temperature；
8) it routinely carries out cooling down, shear, sample preparation, the measurement of magnetic and mechanical performance.
In step 7), finished products temperature can also be according to:
T=837+(2.1×107) × [S] × [N] calculate,
In formula: T-expression finished product annealing temperature, unit are as follows: DEG C,
The content of sulphur in S-expression finished steel plate, is calculated using pure decimal,
The content of nitrogen in N-expression finished steel plate, is calculated using pure decimal.
The comparative example (wt%) of 1 various embodiments of the present invention of table and comparative example
The main technologic parameters list (one) of 2 various embodiments of the present invention of table and comparative example
The main technologic parameters list (two) of 2 various embodiments of the present invention of continued and comparative example
3 various embodiments of the present invention of table and comparative example performance text list
As seen from Table 3, comparative example 1: because of Si+Mn+Al+Sn=3.16%<4.34%, C+S+N+O=0.0101%>0.010%,
And the < of Mn/S=46 100, Al/N=274 < 600, lead to P1.0/400=17.11 > 13.5W/kg, B5000=1.635 < 1.65T, it is magnetic
It can not conform to, and yield tensile ratio=0.67 < 0.74, magnetic strength yield tensile ratio is relatively low；Comparative example 2: because of Si+Mn+Al+Sn=3.39% < 4.34%, C+
The > of S+N+O=0.0107% 0.010%, and the < of Al/N=254 600, even if the > of Mn/S=165 100, also leads to P1.0/400=17.11
> 16.99W/kg, B5000=1.607 < 1.65T and yield tensile ratio=0.72 < 0.74, high-gradient magnetism does not conform to relatively low with yield tensile ratio；It is right
Ratio 3: because of the < of Si+Mn+Al+Sn=3.79% 4.34%, and C+S+N+O=0.0124% > 0.010%, Mn/S=73 < 100, i.e.,
Make the > of Al/N=620 600, still results in B5000=1.626≤1.65T and yield tensile ratio=0.84 > 0.78, magnetic strength is relatively low and yield tensile ratio is inclined
It is high.Comparative example 17: although C+S+N+O=0.0085%<0.010%, Si+Mn+Al+Sn=5.63%>5.20%, and Mn/S=
458 > 320, even if the > of Al/N=732 600, still results in P1.0/400=14.15 > 13.5W/kg, yield tensile ratio=0.82 > 0.78, high frequency
Iron loss is higher with yield tensile ratio；Comparative example 18: although C+S+N+O=0.0086%<0.010%, Si+Mn+Al+Sn=5.87%>
5.20%, lead to P1.0/400=16.40 > 13.5w/kg and yield tensile ratio=0.87 > 0.78, iron loss and yield tensile ratio are higher；Comparative example 19:
Because of C+S+N+O=0.0112% > 0.010% and Si+Mn+Al+Sn=6.06% > 5.20%, lead to P1.0/400=16.12>
13.5w/kg, yield tensile ratio=0.89 > 0.78, iron loss and yield tensile ratio are higher；Comparative example 20: because C+S+N+O=0.0128% >
0.010% and Si+Mn+Al+Sn=5.95% > 5.20%, lead to P1.0/400=13.90 > 13.5w/kg and yield tensile ratio=0.80 >
0.73, iron loss and yield tensile ratio are higher.Only Si+Mn+Al+Sn control 4.34~5.20%, and C+S+N+O≤0.010%,
Mn/S control is between 100~320, Al/N controls the embodiment between 600~980, could meet magnetic property simultaneously
(P1.0/400≤ 13.5w/kg, B5000>=1.65T) and mechanical performance (0.74≤yield tensile ratio≤0.78) requirement.
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (1)
1. producing method of the medium-high frequency driving motor with 0.27mm thickness non-orientation silicon steel, step:
1) smelted and ingot of casting, controlled in endpoint molten steel using vaccum sensitive stove: C+S+N+O total amount 0~0.010%,
Si+Mn+Al+Sn total amount is in 4.34~5.20%, Mn/S in 100~320, Al/N 600~980；
2) heat after cogging: control heating temperature keeps the temperature 45~75min at 910~960 DEG C at this temperature；
3) hot rolling is carried out, controls finish rolling finishing temperature at 780~799 DEG C；It is hot-rolled down to 2.0~2.5mm of plate thickness；
4) carry out normalizing: normalizing heating and temperature control keeps the temperature 3~5min at 920~960 DEG C at this temperature；
5) carry out pickling: acid liquor temperature is controlled at 82~92 DEG C；
6) carry out cold rolling: cold rolling adds up reduction ratio control 87.9~90%, and finished product thickness is in 0.27 ± 0.010mm；
7) finished products are carried out: in H2: N2It is carried out in the gaseous mixture of=1:1, annealing temperature is carried out according to following formula, and is controlled
880 ~ 990 DEG C, and 150~250s is kept the temperature under this annealing temperature；
T=837+(2.1×107) × [S] × [N] calculate,
In formula: T-expression finished product annealing temperature, unit are as follows: DEG C,
The content of sulphur in S-expression finished steel plate, is calculated using pure decimal,
The content of nitrogen in N-expression finished steel plate, is calculated using pure decimal；
8) it routinely carries out cooling down, shear, sample preparation, the measurement of magnetic and mechanical performance；
Medium-high frequency driving motor 0.27mm thickness non-orientation silicon steel, component and weight percent content are as follows: C :≤
0.0028%, Si:2.61~3.05%, Al:1.05~1.48%, Mn:0.22~0.48%, Sn:0.14 ~ 0.49%, P≤0.022%,
S:0.0021~0.0029%, N:0.0024~0.0025%, remaining is Fe and inevitable impurity；And control simultaneously: C+
S+N+O total amount≤0.010%, Si+Mn+Al+Sn total amount 4.34~5.20%, Mn/S 100~320, Al/N 600~
980。
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