CN101333620A - High grade non- oriented silicon steel and method for manufacturing same - Google Patents
High grade non- oriented silicon steel and method for manufacturing same Download PDFInfo
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Abstract
The invention discloses a high-brand non-oriented silicon steel as well as a manufacturing method, which are mainly characterized in that: chemical constituents thereof include, in weight percent: Si: 2.5 to 3.5 percent, Al: 0.5 to 1.5 percent, C<=0.004 percent, Mn: 0.10 to 1.50 percent, P<=0.02 percent, S<=0.005 percent, N<=0.002 percent, B<=0.005 percent, B/(C+N)=0.5-2.0; and the manufacturing method mainly includes: heating a casting billet to above 1100DEG C in a heating furnace, carrying out rolling, normalizing, acid washing and cold rolling after heat preservation, with the reduction rate of between 70 and 78 percent, and annealing, with d.p. equal to -25 to -40DEG C. The non-oriented silicon steel and the manufacturing method can make electric steel sheets and strips with excellent performance, and can reduce furnace roller nodulations and energy consumption in production, and further reduce the production cost.
Description
Technical field
The present invention relates to field of metallurgy, particularly a kind of high grade non-oriented electrical steel and manufacture method thereof with fine magnetic property.
Background technology
High grade non-oriented silicon steel is mainly used in makes high capacity motor and generator iron core, and the principal feature of its magnetic is that iron loss is extremely low.Traditionally its manufacture characteristic be silicone content more than 2.5%, add the aluminium more than 0.2% again, increasing the resistance in the steel, thereby reduce iron loss.Implement hot rolling, normalizing and cold rolling process again, and carry out final annealing and be coated with insulating layer coating.For reducing iron loss, the final annealing temperature requirement reaches more than 1000 ℃, even 1075 ℃.But the problem one that high temperature annealing brought is the cost height, the 2nd, and the oxide compound that belt steel surface adheres to is that iron is deposited in the furnace roller surface by hydrogen reducing, thereby causes the furnace roller dross.For preventing the furnace roller dross, prolong the work-ing life of furnace roller, usually adopt and improve the furnace roller material, as use carbon cover roller, ceramic coating roller and use measure such as levitron in the high-temperature zone, in fact the way of improving the furnace roller material does not obtain good effect, use the way of levitron to increase facility investment, at high temperature the application risk of levitron is bigger simultaneously.
US Patent No 4666534 is pointed out, for producing Si content＜2.0%, Al content is between 0.10%～0.20%, Mn content is when 1.0%～1.5% electrical steel, Xiang Gangzhong add simultaneously 0.02%～0.2%Sn and＜0.005%B, control B/N can obtain the electrical steel of low iron loss and high magnetic strength than 0.5～1.5.Mention Sumitomo Metal Industries adds proper content in the 3%Si steel of producing high Al (0.5%-1.0%) B among the flat 3-24250 of Japanese Patent, can prevent to form internal oxidation layer and interior nitride layer, and promote simultaneously magneticanisotropy is reduced by grain growth.
Summary of the invention
The purpose of this invention is to provide a kind of high grade non-oriented silicon steel and manufacture method thereof,, utilize lower annealing temperature to produce high grade electric steel, reduce the furnace bottom roll dross, avoid being with steel to scratch to be implemented under the prerequisite that guarantees magnetic property.
Technical scheme of the present invention is: a kind of high grade non-oriented silicon steel, its chemical component weight per distribution ratio is: Si:2.5～3.5%, Al:0.5～1.5%, C≤0.004%, Mn:0.10～1.50%, P≤0.02%, S≤0.005%, N≤0.002%, B≤0.005%, B/ (C+N)=0.5～2.0; All the other are iron and unavoidable impurities.
Preferably, B/ (C+N)=0.8～1.5.Find that in the research of the high Al of high silicon (2.5～3.5%) (0.5～1.0%) steel the effect of B in molten and N is inseparable with C content, interpolation＜0.005%B in the molten steel optimizes C, B and N content, makes B/ (C+N)=0.5～2.0 (0.8～1.5 optimum).C can promote the diffusion of B, makes B and N preferentially form BN, is that core is separated out thick AlN with BN, separates out tiny AlN when preventing hot rolling, thereby can the good magnetic property of obtained performance.
Si: can be dissolved in and form substitutional solid solution in the ferrite, improve matrix resistivity, reduce iron loss, it is the most important alloying element of electrical steel, when Si content reached certain value, its content continued to increase, and reduced the iron loss effect and obviously weakened, the present invention 2.5%≤Si≤3.5%, silicone content surpasses 3.5% processing difficulties.
Al: dissolve in ferrite and improve matrix resistivity, coarsened grain reduces iron loss, simultaneously all right deoxidation fixed nitrogen, but cause oxidation in the finished product steel plate top layer easily.Al content surpasses 1.5% will make smelting cast difficulty, and magnetic strength reduces, and processing difficulties.
Mn: the same resistivity that can increase steel with Si, Al, reduce iron loss, can form stable MnS with inevitable inclusion S, eliminate the harm of S to magnetic, also can prevent hot-shortly, it also is dissolved in ferrite and forms substitutional solid solution, and the effect that reduces iron loss is arranged.Therefore be necessary to add the content more than 0.1%.Mn of the present invention is 0.10%～1.50%, and it is not obvious that Mn content is lower than 0.1% advantageous effect, is higher than 1.50%, and the Ac1 temperature reduces, and recrystallization temperature reduces, and α-γ phase transformation, deterioration favorable texture take place during thermal treatment.
Below the P:0.02%, in steel, add the processibility that certain phosphorus can improve steel plate, make cold-rolling of steel plate processibility deterioration on the contrary but surpass at 0.02% o'clock for high Si electrical steel P.
S: all harmful to processing and magnetic, itself and Mn form tiny MnS particle, hinder the finished products grain growth, and severe exacerbation magnetic forms low melting point FeS and FeS with Fe
2Or eutectic, easily cause hot-work fragility.S of the present invention≤below 0.005% surpasses 0.005% the Sization thing amount of separating out such as MnS will be increased greatly, hinders grain growth strongly, the iron loss deterioration.
C: harmful to magnetic, be the element that hinders grain growth strongly, C is the element that enlarges the γ phase region simultaneously, α and γ two-phase region transformation amount increased when excessive C handled normalizing, reduced the Ac1 point greatly, and crystal structure is played refining effect, caused that iron loss increases.Si of the present invention 〉=2.5% has belonged to complete ferrite, if content surpasses 0.004% magnetic aging can take place, and therefore stipulates C≤0.004%.
N: easily form small and dispersed nitride such as AlN, hinder grain growth strongly, the iron loss deterioration, N of the present invention≤below 0.002% surpasses 0.002% the Nization thing amount of separating out such as AlN will be increased greatly, hinders grain growth strongly, the iron loss deterioration.
B: low Si contains and adds B in the dimension in order to reduce the Al amount, reduces steel-making cost, adds B in the high Al steel of high Si, B is in solid solution condition, the B of solid solution can improve texture along crystal boundary is poly-partially, can prevent simultaneously P gather partially embrittlement, and can prevent to form internal oxidation layer and interior nitride layer and promote grain growth.B is an interstitial atom, and too high levels hinders domain motion, reduces magnetic property, generally should be controlled at B≤0.005%.
A kind of manufacture method of high grade non-oriented silicon steel comprises following steps:
A. steel-making, molten steel obtains the following steel grade of chemical component weight per distribution ratio behind refining and continuous casting: Si:2.5～3.5%, Al:0.5～1.5%, C≤0.004%, Mn:0.10～1.50%, P≤0.02%, S≤0.005%, N≤0.002%, B≤0.005%, B/ (C+N)=0.5～2.0, all the other are iron and unavoidable impurities;
B. strand after the insulation, is rolled more than process furnace internal heating to 1100 ℃, guarantees the temperature finish to gauge more than 850 ℃;
C. normalizing: hot-rolled sheet plate temperature is elevated to 900～1000 ℃ with the average rate of heating of 5～15 ℃/s, soaking time t:10s≤t≤90s, and the speed of cooling with≤10 ℃/s is chilled to below 650 ℃ then;
D. pickling, cold rolling, draft are 70～78%;
E. annealing: cold-reduced sheet is warmed up to 900～1000 ℃ with the average rate of heating of 〉=25 ℃/s, soaking time 10s≤t≤28s, and atmosphere is 40%～70%H2+60%～30%N2, d.p.=-25～-40 ℃.
Preferably, the normalizing temperature is 920～980 ℃ among the step C.
Preferably, annealing temperature is 900～950 ℃ in the step e.
The present invention compared with prior art has following beneficial effect:
1. adopt the technology of adding the B element, and control B/ (C+N)=0.5～2.0 (best 0.8～1.5) high grade non-oriented electrical steel and carry out low temperature short-cycle annealing processing, can obtain the electrical sheet of excellent property.
2. can reduce the generation of furnace roller dross, reduce the energy consumption of producing, thereby reduce production cost.
Description of drawings
Fig. 1 is relation (the matrix composition 3.0%Si+1%Al) synoptic diagram of B/ (C+N) and iron loss.
Fig. 2 is relation (the matrix composition 3.0%Si+1%Al) synoptic diagram of B/ (C+N) and magnetic strength.
Fig. 3 is the graph of relation of annealing temperature and iron loss.
Embodiment
Press the component of table 1 and smelt, and obtain continuous casting steel billet by continuous casting, continuously cast bloom heating, roughing, finish rolling, regular practice processing, pickling, 70～78% draft once cold rolling are to the finished product thickness of 0.5mm, the final recrystallization annealing of cold rolled strip differing temps.Table 2 is the result that (heat (batch) number correspondence) Chemical Composition steel grade adopts production method of the present invention and finished product epstein frame to measure in the table 1.
Table 1 embodiment Chemical Composition (%)
Table 2 embodiment production method and magnetic result
1,2,5,6 stove compositions in the table 1 among the embodiment are carried out Magnetic Measurement according to the art breading shown in the table 3, and magnetic detection result is as shown in table 3.
Table 3 embodiment production method and magnetic result
As depicted in figs. 1 and 2; with the matrix composition be: Si:3%, Al:1.0%, C＜0.004%, B＜0.005%, N＜0.002%, S＜0.005%, P:0.02%; the steel billet of Mn:0.25%; through hot rolling, 950 ℃ * 60S normalizing, 950 ℃ of annealing; can see; between 0.8～2.0, magnetic property is in better level in B/ (C+N) scope.
As shown in Figure 3, the relation between two kinds of heterogeneity silicon steel annealing temperatures and the magnetic property.With the continuously cast bloom of C:0.0014%, Si:2.91%, Mn:0.20%, Al:0.97%, P:0.005%, S:0.0005%, Sn:0.0021%, B:0.0024%, N:0.0015% composition with do not add B; and all the other compositions and continuously cast bloom that the former is consistent carry out 950 ℃ * 90S normalizing, cold rolling after, carry out following four kinds of technologies and anneal:
Technology 1:850 ℃ * 90S, 40%H
2+ 60%N
2
Technology 2:900 ℃ * 90S, 40%H
2+ 60%N
2
Technology 3:950 ℃ * 90S, 40%H
2+ 60%N
2
Technology 4:1000 ℃ * 90S, 40%H
2+ 60%N
2
In Fig. 3, contain the rising of the steel of B/ (C+N)=0.83 with annealing temperature as can be seen, the amplitude that iron loss reduces is little, the only decline 1.5% of 1000 ℃ core loss value than 900 ℃, and the iron loss that does not contain B is fairly obvious with decrease of temperature, 1000 ℃ core loss value fall be 900 ℃ 6.5%.
Claims (5)
1. a high grade non-oriented silicon steel is characterized in that the chemical component weight per distribution ratio is: Si:2.5～3.5%, Al:0.5～1.5%, C≤0.004%, Mn:0.10～1.50%, P≤0.02%, S≤0.005%, N≤0.002%, B≤0.005%, B/ (C+N)=0.5～2.0; All the other are iron and unavoidable impurities.
2. high grade non-oriented silicon steel as claimed in claim 1 is characterized in that: B/ (C+N)=0.8～1.5.
3. the manufacture method of a high grade non-oriented silicon steel is characterized in that:
A. steel-making, molten steel obtains the following steel grade of chemical component weight per distribution ratio behind refining and continuous casting: Si:2.5～3.5%, Al:0.5～1.5%, C≤0.004%, Mn:0.10～1.50%, P≤0.02%, S≤0.005%, N≤0.002%, B≤0.005%, B/ (C+N)=0.5～2.0, all the other are iron and unavoidable impurities;
B. strand after the insulation, is rolled more than process furnace internal heating to 1100 ℃, guarantees the temperature finish to gauge more than 850 ℃;
C. normalizing: hot-rolled sheet plate temperature is elevated to 900～1000 ℃ with the average rate of heating of 5～15 ℃/s, soaking time t:10s≤t≤90s, and the speed of cooling with≤10 ℃/s is chilled to below 650 ℃ then;
D. pickling, cold rolling, draft are 70～78%;
E. annealing: cold-reduced sheet is warmed up to 900～1000 ℃ with the average rate of heating of 〉=25 ℃/s, soaking time 10s≤t≤28s, and atmosphere is 40%～70%H2+60%～30%N2, d.p.=-25～-40 ℃.
4. the manufacture method of high grade non-oriented silicon steel as claimed in claim 3, it is characterized in that: the normalizing temperature is 920～980 ℃ among the step C.
5. the manufacture method of high grade non-oriented silicon steel as claimed in claim 3, it is characterized in that: annealing temperature is 900～950 ℃ in the step e.
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| CN115198198A (en) * | 2022-09-13 | 2022-10-18 | 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 |
| 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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