CN85100664A - Reduce the method for common orientation silicon steel slab heating temperature - Google Patents
Reduce the method for common orientation silicon steel slab heating temperature Download PDFInfo
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- CN85100664A CN85100664A CN 85100664 CN85100664A CN85100664A CN 85100664 A CN85100664 A CN 85100664A CN 85100664 CN85100664 CN 85100664 CN 85100664 A CN85100664 A CN 85100664A CN 85100664 A CN85100664 A CN 85100664A
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Abstract
The present invention is for reducing the method for 3%Si common orientation silicon steel slab heating temperature.By adding crystal boundary enriched element Sb or Sn, as inhibitors of primary grain growth, and the Mn in the reduction steel, S, C content, make 3%Si common orientation silicon steel slab heating temperature by reducing to 1300 ℃～1200 ℃ more than 1360 ℃, thereby the reduction fuel consumption reduces the slab scaling loss, has increased the life-span of process furnace etc., have obvious economic benefit, still keep good magnetic simultaneously.
Description
The invention belongs to the silicon steel manufacturing process.Mainly be applicable to the blank plates of silicon steels heating.The 3%Si common orientation silicon steel that composition range is about 2.8～3.2%Si, 0.04～0.10%Mn, 0.03～0.06%C, 0.015～0.03%S adopts slab heat technology both at home and abroad always, and Heating temperature reaches more than 1360 ℃.This be because with MnS as inhibitor, have only by heat, just can make the thick MnS solid solution in the slab, the tiny MnS particle of diffusion-precipitation in course of hot rolling then, suppress first grain growth, impel the perfect secondary recrystallization tissue of development, guarantee to obtain good magnetic.But slab heat technology has following shortcoming: fuel consumption increases, and the slab scaling loss is serious, and the process furnace scarfing cinder is frequent, makes output descend the process furnace lost of life etc.
Purpose of the present invention is exactly to make every effort to reduce the slab heating temperature of common orientation silicon steel, increases economic efficiency.
Once by reducing Mn, the S content in the silicon steel, control (Mn%) (S%) product (being about 0.0007～0.0012) reduced slab heating temperature to United States Patent (USP) № 3986902.But effect is still not ideal.
The present invention adopts Sb(or Sn)+MnS is a composite inhibitor, Sb or Sn are the crystal boundary enriched element, has the effect that suppresses grain growth, thereby Mn, S content can further reduce in the steel, (Mn%) (S%) product can be reduced to 0.00025(and need be guaranteed S content 〉=0.007%), still can satisfy the requirement that suppresses first grain growth, the amplitude that slab heating temperature is reduced is bigger.In addition, according to the influence principle of C in the steel, can make MnS solid solution under lower temperature by reducing C content to the activity of S.Therefore, add Sb or Sn, reduce C in the steel, Mn, S content simultaneously, can under the prerequisite that guarantees magnetic, make 3%Si common orientation silicon steel slab heating temperature be reduced to 1300～1200 ℃.
According to above-mentioned principle, the chemical ingredients of 3%Si common orientation silicon steel to be adjusted, concrete composition is as follows: 2.5～3.5%Si, 0.005～0.045%C, 0.025～0.09%Mn, 0.007～0.02%S, 0.03～0.10%Sn or 0.01～0.06%Sb.
Test adopts vacuum induction furnace or 50 tons of top blown oxygen converters to smelt with steel, changes C, Mn, S content and adds Sb(or Sn).Slab rolls into about 2.3mm slab after the differing temps heating, then by general MnS scheme, and twice cold rolling one-tenth finished product.C content and B have been determined under slab heating temperature Ts=1300 and 1250 ℃
10The relation curve of value as shown in Figure 1.In the time of Ts=1250 ℃, C, Mn content and B
10The relation of value as shown in Figure 2.
Find out by Fig. 1, under Ts=1250 ℃, when C content is 0.025～0.04%, can obtain best B
10Value, when C＞0.04%, B
10Be worth higher and stable.Find out by Fig. 2, as C with Mn content is higher or C and Mn content when all very low, B
10Be worth also lowly, when higher C content is equipped with lower Mn content, or lower C content all can obtain B preferably when being equipped with higher Mn content
10Value, but the variation of C content is to B
10The influence of value is more obvious than Mn.As seen, C is more important than Mn to the effect that reduces slab heating temperature Ts.
The present invention has studied the influence (Fig. 3) of Sb to magnetic.Find out that by Fig. 3 when not adding Sb, the magnetic fluctuation is bigger, after the adding Trace Sb, magnetic stability.
Comprehensive The above results shows that when C, Mn and the reduction of S content, slab heating temperature descends, this fact can obtain satisfaction from the relational expression and the C of Mn, S solid solubility product and temperature to the influence of the activity of S explanation.A large amount of test heat (batch) numbers is carried out statistical study, draw Ts and C, the Mn of permission and the relational expression of S content in 2.5～4.0%Si, 0.01～0.06%Sb or 0.03～0.10%Sn, 0.005～0.05%C, 0.025～0.090%Mn, 0.007～0.02%S composition range
Promptly
Ts＝1070+2800C+1100Mn+2500S（℃）……（1）
In the formula, C, Mn, S are weight percentage.
Test shows, adopts chemical ingredients that the present invention controlled and the Ts that determines by the calculating of (1) formula to heat slab, all can obtain good magnetic, and remarkable in economical benefits, when Ts reduced to 1300 ℃ by 1360 ℃, the scaling loss amount of steel dropped to 1% by 5%, saved heavy oil about 2/3.
Description of drawings
Fig. 1 is C content and B
10Relation curve, transverse axis is C content (weight %); The longitudinal axis is B
10(T).The test temperature of curve 1 part among the figure is 1300 ℃, and curve 2 part test temperature are 1250 ℃.Fig. 2 is C, Mn content and B
10Graph of a relation, transverse axis is C content (weight %) among the figure; The longitudinal axis is Mn content (weight %); Test temperature is 1250 ℃, the symbolic representation among the figure: be B
10＜1.77T, zero is B
10〉=1.77～＜1.80T, * be B
10〉=1.80～＜1.84T, △ is B
10〉=1.84T.Fig. 3 is the graph of a relation of Sb content and magnetic, and transverse axis is Sb content (weight %) among the figure; Left vertical is B
10(T); Right vertical is P15/50(W/Kg); Test temperature is 1250 ℃; Black garden circle symbolic representation B among the figure
10, * symbolic representation P15/50.
Embodiment one adopts vacuum induction furnace smelting, chemical ingredients is 3.15%Si, 0.035%Sb, 0.035%C, 0.08%Mn, 0.015%S, the slab that 25mm is thick is rolled into the 2.2mm slab after 1300 ℃ of (calculating Ts by (1) is 1294 ℃) heating, adopt cold-rolling process subsequently twice, annealing temperature is 870 ℃ in the middle of it, cold rolling draft is 60% for the second time, and finished product thickness is that the steel plate of 0.30mm carries out final annealing after 840 ℃ of decarburizing annealing, and magnetic is
B
10＝1.86（T），P
17/50＝1.28（W/Kg）
Embodiment two vacuum induction furnace smeltings, chemical ingredients is 2.92%Si, 0.03%Sb, 0.014%C, 0.052%Mn, 0.01%S, slab is through 1200 ℃ of heating (calculating Ts by (1) formula is 1191 ℃), adopt twice cold-rolling process identical with example one, only cold rolling draft is 50% for the second time, and the thick finished product magnetic of 0.30mm is: B
10=1.81(T), P
17/50=1.45(W/Kg).
3 50 tons of top blown oxygen converters of embodiment are smelted, chemical ingredients is 3.05%Si, 0.05%Sn, 0.025%C, 0.038%Mn, 0.012%S, steel billet is annotated after 1240 ℃ of (Ts that calculates by formula (1) is 1212 ℃) heating by the company that about 200mm is thick, on hot continuous mill, roll into the thick roll coil of strip of 2.2mm, roll into the thick finished product of 0.3mm by example one technology, its magnetic is B
10=1.83(T), P
17/50=1.25(W/Kg).
Claims (4)
1, the method for reduction 3%Si common orientation silicon steel slab heating temperature is characterized in that adopting crystal boundary enriched element Sb (or Sn) and MnS to make inhibitor, reduces Mn, S, C content in the steel, can make slab heating temperature be reduced to 1300～1200 ℃;
2, method according to claim 1 is characterized in that adding 0.03～0.1%Sn or 0.01～0.06%Sb;
3, method according to claim 1 is characterized in that Mn content reduces to 0.025～0.09%, and S content reduces to 0.007～0.02%, and C content reduces to 0.005～0.045%;
4,, it is characterized in that drawing the formula that calculates slab heating temperature Ts, promptly according to claim 1,2 and 3 described methods
Ts=1070+2800C+1100Mn+2500S(℃) C, Mn, S are weight percentage in the formula
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100664A CN85100664B (en) | 1985-04-01 | 1985-04-01 | Method for reducing heating temperature of common oriented silicon steel slab |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85100664A CN85100664B (en) | 1985-04-01 | 1985-04-01 | Method for reducing heating temperature of common oriented silicon steel slab |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85100664A true CN85100664A (en) | 1986-09-24 |
| CN85100664B CN85100664B (en) | 1987-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85100664A Expired CN85100664B (en) | 1985-04-01 | 1985-04-01 | Method for reducing heating temperature of common oriented silicon steel slab |
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| CN (1) | CN85100664B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010075797A1 (en) | 2008-12-31 | 2010-07-08 | 宝山钢铁股份有限公司 | Method for manufacturing grain oriented silicon steel with single cold rolling |
| CN101353760B (en) * | 2007-07-23 | 2010-10-13 | 宝山钢铁股份有限公司 | High magnetic induction grain-oriented silicon steel and production method thereof |
| CN101463447B (en) * | 2007-12-18 | 2010-12-08 | 鞍钢股份有限公司 | Method for producing oriented silicon steel by heating low-temperature plate blank |
-
1985
- 1985-04-01 CN CN85100664A patent/CN85100664B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353760B (en) * | 2007-07-23 | 2010-10-13 | 宝山钢铁股份有限公司 | High magnetic induction grain-oriented silicon steel and production method thereof |
| CN101463447B (en) * | 2007-12-18 | 2010-12-08 | 鞍钢股份有限公司 | Method for producing oriented silicon steel by heating low-temperature plate blank |
| WO2010075797A1 (en) | 2008-12-31 | 2010-07-08 | 宝山钢铁股份有限公司 | Method for manufacturing grain oriented silicon steel with single cold rolling |
| US9038429B2 (en) | 2008-12-31 | 2015-05-26 | Baoshan Iron & Steel Co., Ltd. | Method for manufacturing grain-oriented silicon steel with single cold rolling |
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| Publication number | Publication date |
|---|---|
| CN85100664B (en) | 1987-03-11 |
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