CN107974620B - A kind of yield strength >=600Mpa high speed rotor of motor non-orientation silicon steel and production method - Google Patents
A kind of yield strength >=600Mpa high speed rotor of motor non-orientation silicon steel and production method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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Abstract
A kind of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels, chemical component are calculated as by wt%: C:0.001-0.003%, Si:2.6-3.4%, Mn:0.20-0.60%, P≤0.005%, S≤0.005%, Als:0.75-0.95%, N:0.002-0.006%, Nb:0.053-0.20%.Production stage: through converter smelting and it is cast into base；Continuous casting billet is heated；Conventional roughing and finish rolling；Normalizing；Cold rolling is carried out after pickling；Continuous annealing.End properties of the thickness of the present invention no more than 0.35mm are in yield strength >=600MPa, tensile strength >=700MPa, P1.0/400≤ 35W/kg, B5000≥1.60T。
Description
Technical field
The present invention relates to non-oriented electrical steel manufacturing technologies, and in particular to a kind of high revolving speed rotor non-orientation silicon steel and its
Production method, the high-intensitive non-orientation silicon steel production it is suitable for finished product thickness no more than 0.35mm.
Background technique
Permanent magnet synchronous motor is mainly made of the rotor of the stator of winding and configuration permanent magnet, forever with internal rotor embedment
Magnet is mainstream, referred to as ipm motor, is the motor with intelligent power module.
Currently, due to the rapid development of electronic technology, with the revolving speed of motor towards can any controlling party in mechanical equipment
To development, to realize high speed.And the electromagnetic steel plate as core material in motor, it is required that the frequency used be no longer with
The power frequency of past 50Hz or 60Hz, but to be used under high frequency environment, i.e., it can be run at 400Hz to thousands of Hz.Therefore, from
From the point of view of product, current product cannot be met the requirements.New requirement also wants revolving speed not less than 10000 revs/min, this makes to turn
Son not only increases centrifugal force in the case where running at high speed, and because the stress that the variation of revolving speed is born also is changing.Therefore to turn
There has also been higher requirements for the mechanical performance of the core material of son.Especially ipm motor, rotor it is complex-shaped, should consider
The stress of rotor is concentrated, and considers the mechanical performances such as the stress changed simultaneously with centrifugal force again.In addition, in robot and other
Requirement of the servo motor used in Work machine field similarly because of the high speed of revolving speed to electromagnetic steel plate is also higher and higher.
The excellent electromagnetic steel plate of this magnetic property and mechanical performance is how manufactured, was all reported there are many document, mainly
The method for improving non-orientation silicon steel mechanical strength can be divided into several classes: precipitation strength, solution strengthening, dislocation strengthening and more than it is strong
Change mechanism it is composite intensified.
Electrical sheet ingredient used in motor is usually all Ultra-low carbon, nitrogen (mass fraction is respectively less than 50ppm) and high silicon
(2.4%-3.5%) needs to be added high Al also sometimes to guarantee that its excellent magnetic property is especially low iron loss.High revolving speed driving electricity
The confidential electrical sheet asked will more traditional high 200MPa or more of non-oriented electrical steel intensity, and improve intensity while also needing to protect
Card cannot damage its excellent magnetic property.
In the prior art, magnetic property silicon steel is to improve intensity by the solution strengthening of Si, Al while reducing iron loss, is deposited
In production technology harshness, cause cold rolling difficult since Si content is higher；Higher Al can greatly increase steel-making difficulty.Therefore
Common high strength construction steel mostly uses the strengthening mechanisms such as solid solution and precipitation, can effectively improve intensity, but its magnetic property is poor.Therefore it needs
Non-oriented electrical steel intensity is improved by a variety of strengthening mechanisms.
Japan began one's study high-intensitive non-oriented electrical steel from 1980, represents producer and is mainly Nippon Steel, JFE and lives
Friendly metal.
In terms of solution strengthening improves non-oriented electrical steel intensity, Nippon Steel is main in disclosed patent before nineteen ninety
Using solution strengthening such as Si, P, Mn, Ni, other alloying elements such as Cr, Mo, Cu, Ti can be also used, and sometimes to reach high-strength
Degree generally can suitable control production board crystallite dimension.
In terms of precipitation strength improves non-oriented electrical steel intensity, since past solution strengthening often contains expensive gold
Belong to nickel, cost of alloy is caused to significantly rise, and solution strengthening increases the intensity before rolling, so that rolling difficulty increases, because
This Sumitomo Metal Industries proposes in United States Patent (USP) (US 7,922.834 B2,2011-04-12) in 2011 to non-orientation silicon steel
The method of the middle microalloy element that Nb, Ti, V, Zr this kind is added is mentioned by forming tiny carbide particle by precipitation strength
It is high-intensitive.
Start to use other schedule of reinforcements after nineteen ninety, in patent disclosed in Nippon Steel.On the basis of solution strengthening
Zr, Ti are used simultaneously, and V Carbonitride Precipitation is strengthened.In general, carbonitride severe exacerbation magnetic property in order to prevent, patent
In have strict requirements to the content of these elements.In addition, addition Ni will increase the cost of steel, select to be not added in many patents
Ni。
The strengthening effect of various carbonitrides is also not quite similar, and Kubo Tian Meng thinks the carbonitride and other carbon nitrogen of Zr
Compound is compared, and precipitating reinforcing effect is big, while to the deterioration of magnetic property smaller (2003-342698,2003-12-03).
The research steering of the last decade Nippon Steel precipitation strength of Cu metal phase, such as Japan Patent 2008-
261053.2008-10-30 and its document of the Publication No. CN102007226A in China's application.Cu metal phase reduces saturation
The effect very little of magnetic flux density, and compared with carbonitride, it is smaller to the inhibition of magnetic domain wall moving.Using Cu metal phase
Precipitation strength when, Cu metal phase before cold rolling can be made not to be precipitated, or be not precipitated too much by controlled rolling and controlled cooling, or control
Its precipitation state is thus easier cold rolling so that hot rolled plate or normalizing plate be made to be unlikely to harden and embrittlement especially bigly,
Reduce the generation rolled and split when cold rolling.
It from the analysis to document cited above, obtains and for example improves Si, Ni content using solution strengthening, although finished product
Magnetism will not deteriorate, but cost of alloy significantly rises, and largely addition solid solution element will will increase the intensity before rolling, with
The reduction of cold rolling finished product thickness, processing hardening clearly will be easy to that disconnected band occurs in cold rolling, bring to production very big
It is difficult.
Precipitation strength is carried out using Cu, when Cu content is below 1%, the precipitation strength effect of Cu is extremely limited, and Cu content increases
Adding causes age-hardening amount to increase, and precipitate uneven dispersion when Cu content is more than 3% when finished products is precipitated, at timeliness heat
Intensity declines after reason, and magnetic flux density reduces.The brittle failure of steel plate when Cu too high levels also result in Surface Defects in Steel Plate and cold rolling.
In addition, the complex intensifying of a variety of alloying elements, will increase the difficulty of steelmaking alloy, the addition of a variety of alloys will draw
Enter more complicated complex inclusion, the ingredient and size of these complex inclusions are difficult to be effectively controlled, will seriously hinder
Properties of product.The addition of more alloys will also increase the time of steelmaking alloy, influence rhythm of production, and bring higher temperature drop.
In order to meet suitable cast temperature, needs to improve Tapping Temperature of Bof, not only increase energy consumption, be also unfavorable for going for harmful element
It removes.And after a variety of complex intensifying element additions, in order to guarantee sufficiently to be dissolved, complex intensifying element can be played
Effect, needs higher hot rolling heating temperature, this is unfavorable to magnetic property, while also increasing hot rolling energy consumption.And higher hot rolling
If temperature is without control, after hot rolling reeling and in normalizing, precipitate will agglomeration, do not have disperse point
Cloth is to improve the effect of intensity.
Americana US20090202383, it discloses a kind of non-orientation silicon steel and its manufacturing methods.Pass through addition
Cu, Ni, Cr, Mo, elements such as w, matrix solution strengthening and Second Phase Precipitation reinforcing are carried out to improve yield strength, but this method magnetic
Performance is poor, higher cost.
In addition, many Chinese patents also refer to much about the method for improving non-orientation silicon steel intensity.
Chinese patent CN103173678A discloses a kind of rotor non-orientation silicon steel and its manufacturing method.By traditional high
It is added in grade non-oriented silicon steel a small amount of boron (B≤0.005%), 4.1%≤(Si+Al/2+Mn) of main alloy element satisfaction≤
6.0%, S (S≤10ppm) and 850 ~ 900 DEG C × 90S normalizing, > 100 DEG C of warm-rollings, 920 ~ 950 DEG C × 20S are also taken off by Calcium treatment
The technological means such as recrystallization annealing, realization fine magnetic property (B5000 >=1.66T, P1.5/50≤2.70W/kg, anisotropy≤
9%) and it is high-intensitive (yield strength >=420MPa, Low Cycle Fatigue Strength >=420MPa).Document main problem is yield strength
Low, difficulty of processing is big.
Chinese patent CN103409684A discloses a kind of high strength cold-rolled magnetic pole steel and preparation method thereof.By adding C:
0.05 ~ 0.07%, the chemistry such as Mn:1.0 ~ 1.2%, Si:0.3 ~ 0.5%, Als:0.02 ~ 0.07%, Ti≤0.04%, Nb≤0.04% member
Element, and by obtaining high-intensitive and high magnetic induction performance in continuous annealing+flattening process.But it is smooth after iron loss it is very high, and
Smooth process increases cost.
Chinese patent CN201010278193.9 provides a kind of high-magnetic induction non-oriented electrical steel containing vanadium and titanium, chemistry at
Point weight percent be C:0.001-0.005%, Si:0.50-0.65%, Mn:0.15-0.35%, P≤0.025%, S≤
0.008%, Als:0.25-0.35%, N≤0.007%, 0 < Ti≤0.01%, 0 < V≤0.01%, surplus are Fe and can not
The impurity avoided is designed by reasonable ingredient, reduces the precipitation of the vanadium titanium carbon nitride of small and dispersed.Preparation method adds
Hot temperature is 1130-1160 DEG C；Finish rolling start rolling temperature be >=1020 DEG C, finishing temperature be 870-910 DEG C, coiling temperature be >=
650℃.By inhibiting the adverse effect of vanadium titanium, the non-oriented electrical steel containing vanadium and titanium for meeting electromagnetic performance requirement can be produced.But
The document be in the design of low grade non-oriented silicon steel, the indexs such as yield strength and magnetic property are not able to satisfy pot motor rotor
It is required that.
Chinese patent (application number: 201310420802.3) provides the fine magnetic property No yield point electricity of Rm >=600MPa a kind of
Work steel and its production method.Its composition by weight percent content are as follows: Si:2.5-3.5%, Mn:0.1-1.0%, Ni+Al are no more than
1.0%, N≤0.005%, S≤0.015%, C≤0.003%, P≤0.05%, remaining is iron and residual content；And to meet: 1.0
≤Al/Ni≤2.0；Performance: Rm >=600MPa, Rel >=500MPa, P1.0/400≤ 17 W/kg, B5000≥1.66T.The document is
High-revolving driving motor design, it is desirable that high frequency iron loss is low, is obtained by the solution strengthening of the elements such as Ni and Al high-intensitive.The party
Although the performance that method finally obtains can satisfy the requirement of high-intensitive and low iron loss, but since addition is more than 0.3% valuable gold
Belong to Ni, cost of alloy is very high.And excessively high alloy amount will will lead to the increasing of cold rolling difficulty, need using the means such as warm-rolling into
Row production, is unfavorable for producing in enormous quantities.
The document that Chinese Patent Application No. is 200910049782.7, provides a kind of system of 500Mpa grade cold rolled magnetic pole steel
Make method, composition by weight percent content are as follows: C:0.07 ~ 0.1%, Si:0.18 ~ 0.31%, Mn:1.00 ~ 1.50%, P≤
0.02%, S≤0.007%, O≤0.004%, N≤0.004%, Nb:0.046 ~ 0.06%, Ti≤0.003%, V:0.050 ~ 0.070%,
Surplus is Fe and inevitable impurity；Performance: Rm >=570MPa, B5000 >=1.570T, but this steel grade is used as magnetic pole steel, and
Do not consider to control iron loss, from the ingredient of patent, due to the component system using low silicon high-manganese, iron loss will be very high,
It is unable to satisfy the requirement that high speed rotor still keeps lower iron loss in high frequency, is only capable of using as magnetic pole steel.
Summary of the invention
A kind of end properties in view of the deficiencies of the prior art, the present invention provides thickness no more than 0.35mm are in yield strength
>=600MPa, tensile strength >=700MPa, P1.0/400≤ 35W/kg, B5000The high speed rotor of motor non-orientation silicon steel of >=1.60T
And production method.
Realize the measure of above-mentioned purpose:
A kind of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels, chemical composition comprises the following components in percentage by weight are as follows:
C:0.001-0.003%, Si:2.6-3.4%, Mn:0.20-0.60%, P≤0.005%, S≤0.005%, Als:0.75-0.95%,
N:0.002-0.006%, Nb:0.053-0.20%, remaining is iron and residual content；And to meet simultaneously: 4.5%≤Si+2Als-
0.5Mn+2.92P≤5.0% is dissolved niobium Nb*0.04% < Nb of content*% < 0.08%, Nb*%=(Nb/93-C/12-N/14) * 100,
1≤N/C≤3。
Preferably: the weight percent content of Nb is 0.063-0.185%.
Further preferably: the weight percent content of Nb is 0.08-0.176%.
Preferably: the weight percent content of N is 0.0043-0.0055%.
Preferably: solid solution niobium Nb*0.046% < Nb of content*% < 0.073%.
Preferably: the ratio of control N and C is in 1≤N/C≤2.
A kind of method for producing yield strength 600Mpa grades of high speed rotor non-orientation silicon steels, step:
1) through converter smelting and it is cast into base；
2) continuous casting billet is heated, control soaking temperature is at 1100-1150 DEG C, time inside furnace 2-4h；
3) conventional roughing and finish rolling are carried out, and after controlling hot rolling plate thickness in 2.10 ± 0.05mm；
4) normalizing is carried out, controls normalizing soaking temperature at 840-940 DEG C, soaking time is in 20-60s；
5) cold rolling is carried out after pickling: mill product finished product thickness is no more than 0.35mm；
6) continuous annealing is carried out, and controls soaking temperature at 750-820 DEG C, for soaking time in 60-120s, atmosphere is pure dry
N2。
Preferably: normalizing soaking temperature is at 860-920 DEG C.
The effect and mechanism of the main intensified element such as C, Mn, Si, Nb in the present invention:
C:0.001-0.003%
C has larger damage to magnetic property as solid solution carbon or cementite in steel, therefore it is required that C is no more than 0.0030%, together
When, in order to guarantee to have a certain amount of NbC and Nb(C, N) compound, C is not less than 0.001%.
N:0.002-0.006%
N has larger damage to magnetic property in steel, therefore it is required that N≤0.0060%.And nitride and carbonitride are brilliant to refinement
Grain improves intensity and has very important effect, and especially nitride has significant effect, and therefore, it is necessary to certain N to carry out shape
At compound, it is desirable that N >=0.002%, preferably 0.0020%≤N≤0.0030%.Why limiting 1≤[N]/[C]≤3 is because of C
If element is excessively high, it will generate magnetic aging, magnetic property can deteriorate after long service.But also need a small amount of C, Ke Yiyu
N, Nb is formed together NbN or Nb(C, N) compound, plays the role of refinement crystal grain, improves intensity.Because nitride refines crystal grain
Effect it is more obvious, it requires that N content should be higher than that C content, preferably 1≤[N]/[C]≤2.But simultaneously in view of N is easily formed
Dispersed and tiny AlN hinders crystal grain to grow up strongly, deteriorates iron loss, therefore present invention provide that N≤0.0060%.
Si:2.6-3.4%
Si can improve resistivity, reduce iron loss；Si is also solution strengthening element, can significantly improve yield strength, excessively high
Si will lead to rolling difficulty, present invention provide that Si:2.6-3.4%, to guarantee certain yield strength and stable rolling performance,
It is preferred that Si:3.0-3.2%.
Why the present invention limits 4.5≤[%Si]+2 [%Als] -0.5 [%Mn]+2.92 [%P]≤5.0, is to guarantee
Enough resistivity is to reduce eddy-current loss, it is necessary to assure certain alloy content, but alloy content is excessively high plus the analysis of Nb element
The effect strengthened out, the hot rolling plate strength after normalizing is excessively high, and cold rolling load is excessive to be easy to produce disconnected band.
Mn:0.20-0.60%
Mn can significantly improve the yield strength and fatigue strength of steel plate as displaced type solid solution element, but Mn can not mistake
It is high.Because excessively high Mn easily causes hot rolling fluctuation, it is unfavorable for template precision controlling.Meanwhile some researches show that NbC is logical
Often with the compound precipitation of MnS, when Mn and C content are proportional, be conducive to the tiny intensive precipitation of NbC, enhancing inhibits crystal grain to grow up
Effect, to obtain high intensity and toughness.
Al: 0.75-0.95%
Al dissolves in ferrite and improves resistivity reduction iron loss, while energy deoxidation fixed nitrogen, but be easy to cause production board surface layer
Internal oxidition；Al can improve yield strength, but high Al can make to smelt casting difficulty.Therefore present invention provide that Als:0.75-0.95%.
P :≤0.01%
P is solution strengthening element, can also be improved the resistivity of material, but P is excessively high that steel plate is made to become fragile, and increases cold rolling and breaks band
Risk.
S: ≤0.005%
S is the harmful element in steel, significantly reduces fatigue strength, but adding Mn element can be such that MnS solid solubility temperature improves,
It is roughened MnS, therefore can suitably relaxes the limitation of S, reduces steel-making cost.In addition, Mn is also roughened MnS, is conducive to crystal grain and grows up.
Therefore present invention provide that S≤0.005%.
Nb:0.04-0.20%
Nb is a kind of carbide, is mainly existed in steel with carbonitride form, in ferrite matrix
Dispersed precipitate a large amount of diameter be tens nanometers tiny spherical precipitate Nb(C, N), generate solute in crystal boundary segregation
The dragging effect of atom, is remarkably improved recrystallization temperature, and the growth rate of ferrite crystal grain is made to become smaller, and then organizes to obtain thin
Change, the Nb of solid solution limits the mechanism of climbing of dislocation by the drag mechanism to solute, inhibits ferritic recrystallization.Nb(C,
N) have low solid solubility temperature, it can be achieved that lower slab heating temperature, to improve yield rate and reduce cost, and is lower
Slab heating temperature can also reduce the generation of AlN field trash.Therefore present invention provide that Nb is not less than 0.04%, but excessive Nb
Precipitate will be unfavorable to magnetic property, therefore present invention provide that Nb be no more than 0.20%, preferably: the weight percent content of Nb
For 0.063-0.185%, further preferably: the weight percent content of Nb is 0.08-0.176%；Accordingly it is dissolved niobium Nb*Contain
Measure 0.04% < Nb*% < 0.08%.
Why the heating temperature of continuous casting billet is set to 1100-1150 DEG C by the present invention, and time inside furnace 2-4h is because of NbN
And Nb(C, N) there is the general characteristic as non-orientation silicon steel inhibitor can guarantee hot rolling essence with low solid solubility temperature
In the case where degree, slab heating temperature is reduced.Using 6-8 roughing, make crystal grain refinement coarse in steel；Finish rolling is controlled simultaneously
Inlet temperature guarantees that rolling is smooth at 950-990 DEG C.Suitable control finishing temperature is 810-850 DEG C and coiling temperature 650-680
DEG C, on the one hand in steel plate dynamic recovery and dynamic recrystallization driving force is provided, on the other hand improved by precipitation strength
Intensity.Excessively high coiling temperature makes Nb(C, N) it is unable to disperse educt, too low coiling temperature is unfavorable to iron loss is reduced.Finally
Hot rolled plate is controlled with a thickness of 2.10 ± 0.05mm.
The present invention controls 840 DEG C -940 DEG C of normalizing soaking temperature and soaking time 20-60s is necessary condition.Excessively high is normal
It is all unfavorable to yield strength is improved to change temperature and excessively slow plate speed, but too low normalizing temperature and too fast plate speed
It is all unfavorable to magnetic property is improved.
Cold rolling is to realize the committed step of high thickness and precision.It controls cold rolling total reduction and is not less than 80%, and guarantee preceding road
It is secondary using big reduction ratio i.e. 35% or more, final pass uses lesser reduction ratio (5-10%), makes cold change in microscopic structure
Shape tissue increases, and annealing grains are assembled to γ line, forms strong { 111 }<112>texture, and substructure Dislocations density increases.
Continuous annealing is also to realize the committed step of high-performance and high strength bond, 750-820 DEG C of annealing temperature of control and
On the one hand soaking time 60-120S will reduce iron loss and improve magnetic strength, another aspect high intensity needs partial annealing, makes steel plate
In there are part non-recrystallization tissues, and retain dislocation caused by cold rolling heavy reduction, it is common with precipitation strength in dislocation strengthening
Under effect, guarantee yield strength in 600MPa or more.Annealing atmosphere is pure dry N2, avoid because of H2, moisture etc. oxidation is generated in furnace
Reduction reaction causes furnace roller dross；One layer of half organic coating is coated in surface of steel plate simultaneously, prevents from generating biggish whirlpool when lamination
Stream loss.
The present invention is directed to pass through a small amount of Nb of addition and finely tune C, N content and suitable preparation process come produce it is high-intensitive and
The non-oriented electrical steel product that high-performance has both meets high speed rotor of motor steel needs.
The ingredient and preparation process of non-oriented electrical steel of the present invention are mainly around high-intensitive and high-performance designs.It is set in intensity
Meter aspect is based on the precipitation strength and solution strengthening of Nb, through technological measures such as low-temperature annealings while guaranteeing magnetic property,
Retain certain dislocation density and improves yield strength；In magnetic property design aspect, guaranteed centainly by necessary alloy content
Magnetic property.Meanwhile making full use of Nb to the inhibiting effect and Nb(C of recrystallization, N) have low solid solubility temperature, it can be achieved that lower
Hot rolling slab heating temperature and the technique section for suitably relaxing finished products reduce production difficulty to improve yield rate and reduction
Cost.
Compared with prior art, the present invention end properties of the thickness no more than 0.35mm resist in yield strength >=600MPa
Tensile strength >=700MPa, P1.0/400≤ 35W/kg, B5000≥1.60T。
Detailed description of the invention
Fig. 1 is the metallographic structure figure of silicon steel plate after normalizing of the present invention, remains the incomplete of part hot rolling deformation tissue
Recrystallization；
Fig. 2 is the metallographic structure figure of production board of the present invention, and incomplete recrystallized tissue adds part cold-rolling deformation tissue.
Specific embodiment
The present invention is described in detail below:
Table 1 is the chemical component comparative example of various embodiments of the present invention and comparative example；
Table 2 is the main technologic parameters comparative example of various embodiments of the present invention and comparative example；
Table 3 is the capabilities list of various embodiments of the present invention and comparative example.
Each case study on implementation of the present invention follows the steps below production:
1) through converter smelting and it is cast into base；
2) continuous casting billet is heated, control soaking temperature is at 1100-1150 DEG C, time inside furnace 2-4h；
3) conventional roughing and finish rolling are carried out, and after controlling hot rolling plate thickness in 2.10 ± 0.05mm；
4) normalizing is carried out, controls normalizing soaking temperature at 840-940 DEG C, soaking time is in 20-60s；
5) cold rolling is carried out after pickling: mill product finished product thickness is no more than 0.35mm；
6) continuous annealing is carried out, and controls soaking temperature at 750-820 DEG C, for soaking time in 60-120s, atmosphere is pure dry
N2。
1 various embodiments of the present invention of table and comparative example the composition value list (wt%)
Note: silicon equivalent weight Sieq=Si+2Als-0.5Mn+2.92P is dissolved Nb*%=(Nb/93-C/12-N/14) * 100
The main technologic parameters comparative example of 2 various embodiments of the present invention of table and comparative example
The magnetic property and mechanical property list of 3 various embodiments of the present invention of table and comparative example
From table 3 it can be seen that only Composition Control and technique require that within the scope of the claims, satisfaction can be produced
It is required that product.It, excessively high, too low normalizing and annealing temperature and time, can be to magnetic property and machine when ingredient is met the requirements
Tool performance causes different influences, and temperature crosses high-mechanical property and is unable to satisfy requirement, and the too low magnetic property of temperature is unable to satisfy requirement,
See comparative example 1,2,3.When technique is met the requirements, the elements such as Nb, Si, N are too high or too low, can not reach target call, Nb
Excessively high then magnetic property is poor, and the too low then mechanical property of Nb is poor；Si high increases cold rolling difficulty, and the low magnetic property of Si and mechanical performance are equal
It not can guarantee；Low poor mechanical property due to precipitate is few of N, N high then seriously affect magnetic property and can bring magnetic aging, see comparative example
4~8。
Present embodiment is only the best example, not to the restricted implementation of technical solution of the present invention.
Claims (6)
1. a kind of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels, chemical composition comprises the following components in percentage by weight are as follows: C:
0.001-0.0019% or C:0.0021-0.003%, Si:2.6-2.88% or Si:3.07-3.4%, Mn:0.21-0.60%, P≤
0.005%, S≤0.005%, Als:0.75-0.95%, N:0.0022-0.006%, Nb:0.053-0.087% or Nb:0.098-
0.20%, remaining is iron and residual content；And to meet simultaneously: 4.5%≤Si+2Als-0.5Mn+2.92P≤5.0% is dissolved niobium
Nb*0.04% < Nb of content*% < 0.08%, Nb*%=(Nb/93-C/12-N/14) * 100,1≤N/C≤3.
2. a kind of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels as described in claim 1, it is characterised in that: N
Weight percent content be 0.0043-0.0055%.
3. a kind of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels as described in claim 1, it is characterised in that: Gu
Molten niobium Nb*0.046% < Nb of content*% < 0.073%.
4. a kind of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels as described in claim 1, it is characterised in that: control
The ratio of N and C processed are in 1≤N/C≤2.
5. a kind of method of yield strength 600Mpa grades of high speed rotor non-orientation silicon steels as described in claim 1 is produced,
Step:
1) through converter smelting and it is cast into base；
2) continuous casting billet is heated, control soaking temperature is at 1100-1140 DEG C, time inside furnace 2-4h；
3) conventional roughing and finish rolling are carried out, and after controlling hot rolling plate thickness in 2.10 ± 0.05mm；
4) normalizing is carried out, controls normalizing soaking temperature at 840-940 DEG C, soaking time is in 20-60s；
5) cold rolling is carried out after pickling: mill product thickness is no more than 0.35mm；
6) continuous annealing is carried out, and controls soaking temperature at 780-820 DEG C, for soaking time in 60-120s, atmosphere is pure dry N2。
6. a kind of method for producing yield strength 600Mpa grades of high speed rotor non-orientation silicon steels as claimed in claim 5,
Be characterized in that: normalizing soaking temperature is at 860-920 DEG C.
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| CN110241362B (en) * | 2019-07-09 | 2021-05-28 | 鞍钢股份有限公司 | Non-oriented silicon steel for driving motor and production method thereof |
| CN110616370A (en) * | 2019-08-30 | 2019-12-27 | 武汉钢铁有限公司 | Production method of cold-rolled non-oriented silicon steel with excellent iron loss performance under low field |
| CN114369761B (en) * | 2022-01-07 | 2022-11-25 | 山西太钢不锈钢股份有限公司 | Thin non-oriented silicon steel and preparation method thereof |
| CN115198198B (en) | 2022-09-13 | 2022-12-23 | 张家港扬子江冷轧板有限公司 | Non-oriented silicon steel for high-speed motor and preparation method thereof |
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