CN85100664B - Method for reducing heating temperature of common oriented silicon steel slab - Google Patents
Method for reducing heating temperature of common oriented silicon steel slab Download PDFInfo
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- CN85100664B CN85100664B CN85100664A CN85100664A CN85100664B CN 85100664 B CN85100664 B CN 85100664B CN 85100664 A CN85100664 A CN 85100664A CN 85100664 A CN85100664 A CN 85100664A CN 85100664 B CN85100664 B CN 85100664B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 10
- 239000010959 steel Substances 0.000 claims abstract description 10
- 239000003112 inhibitor Substances 0.000 claims abstract description 5
- 239000013078 crystal Substances 0.000 claims abstract description 3
- 239000000203 mixture Substances 0.000 claims description 9
- 239000000446 fuel Substances 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 abstract 1
- 238000005097 cold rolling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000000137 annealing Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The invention relates to a method for reducing the heating temperature of a 3% Si common oriented silicon steel slab. By adding grain boundary enriched element Sb or Sn as an inhibitor for the growth of primary crystal grains and reducing the contents of Mn, S and C in steel, the heating temperature of a common oriented silicon steel slab with 3 percent of Si is reduced to 1300-1200 ℃ from 1360 ℃ or above, thereby reducing the fuel consumption, reducing the slab burning loss, prolonging the service life of a heating furnace and the like, having obvious economic benefit, and simultaneously still maintaining good magnetism.
Description
The invention belongs to silicon steel manufacturing process.Mainly be applicable to blank plates of silicon steels heating.
The 3%Si common orientation silicon steel that composition range (weight percent) 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 technique both at home and abroad always, and Heating temperature reaches more than 1360 ℃.This is because using MnS as inhibitor, only has by heat, just can make the thick MnS solid solution in slab, then the tiny MnS particle of diffusion-precipitation in course of hot rolling, suppress first grain growth, impel the perfect secondary recrystallization tissue of development, guarantee to obtain good magnetic.But slab heat technique has following shortcoming: fuel consumption increases, and slab scaling loss is serious, and process furnace scarfing cinder is frequent, makes production declining, the process furnace lost of life etc.
Object of the present invention is exactly to make every effort to reduce the slab heating temperature of common orientation silicon steel, increases economic efficiency.
U.S. Patent No. 3986902 once, by reducing Mn, the S content in silicon steel, was controlled (Mn%) (S%) (weight percent) product (being about 0.0007～0.0012) and was reduced slab heating temperature.But effect is still not ideal.
The present invention adopts Sb or Sn to add that MnS is composite inhibitor, Sb or Sn are crystal boundary enriched element, there is the effect of inhibiting grain growth, thereby in steel, Mn, S content can further reduce, Mn%) (S%) (weight percent) product can be down to 0.00025 (needing to guarantee S content >=0.007 (weight) %), still can meet the requirement that suppresses first grain growth, the amplitude that slab heating temperature is reduced is larger.In addition, the activity according to C in steel on S affect principle, can make MnS solid solution at lower temperature by reducing C content.Therefore, add Sb or Sn, reduce C in steel, Mn, S content simultaneously, can guarantee, under the prerequisite of magnetic, to make 3% (weight) Si common orientation silicon steel slab heating temperature be reduced to 1300～1200 ℃.
According to above-mentioned principle, chemical composition to 3 (weight) %Si common orientation silicon steel is adjusted, concrete composition (weight percent) is as follows: 2.5～3.5%Si, 0.005～0.045%C, 0.025～0.09%Mn, 0.007～0.02%S, 0.01～0.06%Sb or 0.03～0.10%Sn.
Test steels adopts vacuum induction furnace or 50 tons of top blown oxygen converters to smelt, and changes C, Mn, S content and adds Sb or Sn.Slab rolls into approximately 2.3 millimeters of slabs after differing temps heating, then by generally making inhibitor scheme with MnS, and twice cold rolling one-tenth finished product.Determine that at slab heating temperature Ts=1300 and 1250 ℃, the relation curve of C content and B10 value as shown in Figure 1.Ts=1250 ℃ time, the relation of C, Mn content and B10 value as shown in Figure 2.
Found out by Fig. 1, at Ts=1250 ℃, in the time that C content is 0.025～0.04 (weight) %, can obtain best B10 value, in the time of C > 0.04%, B10 value is higher and stable.Found out by Fig. 2, as C with when Mn content is higher or C and Mn content are all very low, B10 value is also low, when higher C content is equipped with lower Mn content, or lower C content is while being equipped with higher Mn content, all can obtain good B10 value, but the variation of C content is more obvious than Mn on the impact of B10 value.Visible, C is more important than Mn to the effect of reduction slab heating temperature Ts.
The present invention has studied the impact (Fig. 3) of Sb on magnetic.Found out by Fig. 3, while not adding Sb, magnetic fluctuation is larger, adds after Trace Sb magnetic stability.
Comprehensive the above results shows, in the time that C, Mn and S content reduce, slab heating temperature declines, this fact can be from the relational expression of Mn, S solid solubility product and temperature and C the impact of the activity on S obtain the explanation being satisfied with.A large amount of test heat (batch) numbers is carried out to 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 (weight percent),
Ts＝1070+2800C+1100Mn+2500S(℃)????(1)
In formula, C, Mn, the S content that is weight percentage.
Test shows, adopts chemical composition that the present invention controls and by the Ts heating slab of (1) formula calculative determination, all can obtain good magnetic, and remarkable in economical benefits, in the time that Ts is down to 1300 ℃ by 1360 ℃, the scaling loss amount of steel is down to 1% by 5%, saves heavy oil approximately 2/3.
Accompanying drawing explanation:
Fig. 1 is the relation curve of C content and B10, and transverse axis is that C contains (% by weight), and the longitudinal axis is B10 (T).The test temperature of curve 1 part in figure is 1300 ℃, and curve 2 part test temperature are 1250 ℃.Fig. 2 is the graph of a relation of C, Mn content and B10, and in figure, transverse axis is C content (% by weight); The longitudinal axis is Mn content (% by weight); Test temperature is 1250 ℃, and the symbol in figure represents: be B10 < 1.77T, 0 is B10 >=1.77～< 1.80T, × be B10 >=1.80～< 1.84T, be B10 >=1.84T.Fig. 3 is the graph of a relation of Sb content and magnetic, and in figure, transverse axis is Sb content (% by weight); Left vertical is B10 (T); Right vertical is P15/50 (W/kg); Test temperature is 1250 ℃; Stain symbol in figure represents B10, and × symbol represents P15/50.
Embodiment mono-: adopt vacuum induction furnace smelting, chemical composition (weight percent) is 3.15%Si, 0.035%Sb, 0.035%C, 0.08%Mn, 0.015%S, the slab of 25 mm thick is rolled into 2.2 millimeters of slabs after 1300 ℃ of (calculating Ts by (1) is 1294 ℃) heating, adopt subsequently cold-rolling process twice, in the middle of it, annealing temperature is 870 ℃, cold rolling draft is 60% for the second time, finished product thickness is that the steel plate of 0.30 millimeter carries out final annealing after 840 ℃ of decarburizing annealing, and magnetic is
B10＝1.86(T)，P17/50＝1.28(W/kg)
Embodiment bis-: vacuum induction furnace smelting, chemical composition (weight percent) 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, 0.30 mm thick becomes counter being judged to: B10=1.81 (T), P17/50=1.45 (W/kg).
Tri-: 50 tons of top blown oxygen converters of embodiment are smelted, chemical composition (weight percent) is 3.05%Si, 0.05%Sn, 0.025%C, 0.038%Mn, 0.012%S, company's note steel billet of approximately 200 mm thick is after 1240 ℃ of (Ts calculating by formula (1) is 1212 ℃) heating, on hot continuous mill, roll into the 2.2 mm thick roll coil of strips, roll into the finished product of 0.3 mm thick by example one technique, its magnetic is B10=1.83 (T), P17/50=1.25 (W/kg).
Claims (4)
1. reduce the method for 3 (weight) %Si common orientation silicon steel slab heating temperature, it is characterized in that adopting crystal boundary enriched element Sb or Sn and MnS to make inhibitor, reduce Mn, S, C content in steel, can make slab heating temperature be reduced to 1300～1200 ℃.
2. method according to claim 1, is characterized in that adding 0.01～0.06 (weight) %Sb or 0.03～0.10 (weight) %Sn.
3. method according to claim 1, is characterized in that Mn content is down to 0.025～0.09 (weight) %, and S content is down to 0.007～0.02 (weight) %, and C content is down to 0.005～0.045 (weight) %.
4. according to any one method described in claim 1～3, it is characterized in that, drawn the formula that calculates slab heating temperature Ts,
Ts＝1070+2800C+1100Mn+2500S(℃)
In formula, C, Mn, S are the weight percent content of composition separately.
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 CN85100664A (en) | 1986-09-24 |
| CN85100664B true 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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| Country | Link |
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| CN (1) | CN85100664B (en) |
Families Citing this family (3)
| 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 |
| CN101768697B (en) | 2008-12-31 | 2012-09-19 | 宝山钢铁股份有限公司 | Method for manufacturing oriented silicon steel with one-step cold rolling method |
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1985
- 1985-04-01 CN CN85100664A patent/CN85100664B/en not_active Expired
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| Publication number | Publication date |
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| CN85100664A (en) | 1986-09-24 |
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