CN1211625A - Production method for cold-rolled pure iron plate with texture of coarse crystal - Google Patents
Production method for cold-rolled pure iron plate with texture of coarse crystal Download PDFInfo
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- CN1211625A CN1211625A CN 98103523 CN98103523A CN1211625A CN 1211625 A CN1211625 A CN 1211625A CN 98103523 CN98103523 CN 98103523 CN 98103523 A CN98103523 A CN 98103523A CN 1211625 A CN1211625 A CN 1211625A
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Abstract
A cold rolled iron plate with bigger crystal grains contains C (less than 0.01 wt.%), Si (less than 0.1 wt.%), Mn (0.1-0.5 wt.%), Al (less than 0.05 wt.%), P (0.02-0.1 wt.%), S (less than 0.01 wt.%), N (less than 0.005 wt.%), O (less than 0.015 wt.%) and Fe (rest) and is made up through heating its casting to 1100-1250 deg.C, final rolling at 850-950 deg.C to make it reach defined thickness, final annealing at 850-910 deg.C and winding at 600-750 deg.C. Its advantages are bigger crystal grains under No.3, and excellent soft magnetism including high magnetic permeability and very low magnetic coercive force.
Description
The present invention relates to a kind of production method with electromagnetic pure iron plate of excellent soft magnetic performance.
Cold rolling electromagnetic pure iron is owing to have high magnetic permeability, low coercive force and higher iron loss, generally be used for rly., motor and the magnetic shielding etc. of direct-current circuit work, it is the inevitable internal factor that obtains extremely low coercive force and high magnetic permeability that final cold-rolled pure iron plate after cold rolled annealed has texture of coarse crystal.At present, obtain the main means of texture of coarse crystal for increasing crystal grain thickization element such as Si, Al and carrying out critical rolling.For example, existing standard GB 6985-86 is defined as the chemical ingredients of several cold rolling electromagnetic pure irons (DT) trade mark: the DT4 that coercive force is lower (A, E, C) contains higher silicon (0.2%), higher aluminium (0.15～0.5%), these are the grain coarsening element, increase these elements production cost is increased.In production reality, for further coarsened grain, also often adopt twice cold rolling method, under the critical pressure, draft is generally 4～10% for the second time.For example the flat 5-247604 of Japanese Patent Application Laid-Open discloses a kind of " the soft magnetism iron plate and the manufacture method thereof of magnetic properties excellence ", and its composition is the method that also adopts on the soft magnetism iron plate of the low aluminium (＜0.05%) of the low silicon (＜0.05%) of Ultra-low carbon under the critical pressure.But the way adopting under the critical pressure has increased production process, has improved product cost.
The objective of the invention is to obtain the method that a kind of low cost production has the cold-rolled pure iron plate of texture of coarse crystal, needn't add the grain coarsening element, also needn't carry out under the cold rolling critical pressure second time.
For achieving the above object, the technical solution of the present invention's proposition is:
A kind of production method with cold-rolled pure iron plate of texture of coarse crystal, its chemical ingredients are (weight %): C＜0.01, Si＜0.1, Mn0.1～0.5, Al＜0.05, P0.02～0.1, S＜0.01, N＜0.005, O＜0.015, all the other are Fe, with the strand of mentioned component 1100～1250 ℃ of heating, 850～950 ℃ of finish to gauges, roll specific thickness, 600～750 ℃ are batched, and after the once cold rolling, cold-reduced sheet is at 850～910 ℃ of final annealings.
Described chemical ingredients is (weight %): C＜0.01, Si＜0.1, and Mn 0.2～0.5, Al＜0.01, P 0.05～0.1, S＜0.01, N＜0.005, O＜0.015, all the other are Fe,
Below the present invention is done and be described in further detail.
Key of the present invention is the composition by the design pure iron, and improves hot rolling technology, obtains thick hot rolling grain structure, reaches the purpose of the thick cold rolling grain structure of final acquisition.
Introduce principle of the present invention below:
The chemical ingredients that the present invention has the cold-rolled pure iron plate of texture of coarse crystal is (weight %): C＜0.01, Si＜0.1, and Mn 0.1～0.5, Al＜0.05, P 0.02～0.1, S＜0.01, N＜0.005, O＜0.015, all the other are Fe.
Acting as of each alloying element wherein:
P:0.02～0.1, P is generally impurity element in structure iron, but is alloying element in the present invention, the steel plate of mentioned component is not because of almost there being strengthening element, and steel plate is very soft, and stamping-out is bad, add a certain amount of can P, improve the intensity of steel plate, improve its stamping-out performance, because of it enlarges alpha phase zone in steel, dwindle the γ phase region, can promote grain coarsening,＜0.02, then sclerization is not enough;＞0.1, cause the steel plate embrittlement.
Mn:0.1～0.5, Mn and S form MnS, can prevent to form the caused hot-short phenomenon of low-melting FeS along crystal boundary, improve hot rolling plasticity, cooperate P to improve hardness simultaneously, improve punching.
C＜0.01, Si＜0.1, Al＜0.05, S＜0.01, N＜0.005, O＜0.015, these are impurity element, and are low more good more.
With the continuously cast bloom of mentioned component or die casting base 1100～1250 ℃ of heating, in this temperature range, AlN, MnS can fully not be fused in the austenite, be higher than 1250 ℃, AlN, MnS are fused in the austenite, when finish rolling, can separate out, hinder grain growth, be lower than 1100 ℃ of temperature then can not guarantee finish rolling the time.
Be controlled at 850～950 ℃ of finish to gauges when rolling, because it is very few to hinder the element of grain growth in the composition, ferrite crystal grain is grown up.
Roll specific thickness, be controlled at 600～750 ℃ and batch, can impel recrystallize to take place, crystal grain is further grown up.
After the once cold rolling, cold-reduced sheet is at 850～910 ℃ of final annealings, and it is insufficient to be lower than 850 ℃ of grain growths, is higher than 910 ℃ α → γ phase transformation can take place, and produces small grains.
The present invention can obtain cold rolling final annealing grain fineness number and reach grain structure thick below No. 3, thereby obtain the excellent soft magnetic performance of high permeability, utmost point low-coercivity because alloying constituent and hot rolling technology improve.
Introduce embodiments of the invention below.
The die casting base of the alloy of the present invention that composition is as shown in table 1,1200 ℃ of heating, 900 ℃ of finish to gauges, 700 ℃ are batched, hot-rolled sheet thickness is 4.7mm and 2.8mm, once cold rolling obtains the thick cold-reduced sheet of 1.5mm and 1.0mm respectively, 580 ℃, after the softening annealing in 5 hours, 900 ℃, 4 hours final annealings obtain grain fineness number and are No. 2 texture of coarse crystal.The production technique of Comparative Examples is identical with it.
Plate of the present invention after the softening annealing and contrast plate cut into standard magnetic survey sample, adopt above-mentioned final annealing technology, and the magnetic survey result is as shown in table 2, show to adopt the inventive method the performance of steel plate can be improved 1～2 trade mark.
Table 1
| The present invention | Comparative Examples | ||
| Chemical ingredients (wt%) | ????C ????Si ????Mn ????Al ????P ????S ????N ????O | ????0.0057 ????0?072 ????0.40 ????0?004 ????0.078 ????0.0035 ????0.0028 ????0.0083 | ????0.0026 ????＜0.03 ????0.28 ????0.021 ????0.007 ????0.0045 ????0.0032 |
| Grain fineness number | No. 2 | No. 5 | |
Table 2
| Thickness (mm) | ????B25 ????(T) | ????B50 ????(T) | ????B100 ????(T) | ????Hc ??(A/m) | Trade mark GB6985-86 | |
| The present invention | ????1.0 | ????1.64 | ????1.73 | ????1.84 | ????44 | ????DT4E |
| ????1.5 | ????1.69 | ????1.77 | ????1.89 | ????36 | ||
| Comparative Examples | ????1.0 | ????96 | ????DT4 | |||
| ????1.5 | ????62 | ????DT4A |
Claims (2)
1. production method with cold-rolled pure iron plate of texture of coarse crystal is characterized in that: its chemical ingredients is (weight %): C＜0.01, Si＜0.1, Mn 0.1～0.5, Al＜0.05, and P 0.02～0.1, S＜0.01, N＜0.005, O＜0.015, all the other are Fe, with the strand of mentioned component 1100～1250 ℃ of heating, 850～950 ℃ of finish to gauges, roll specific thickness, 600～750 ℃ are batched, and after the once cold rolling, cold-reduced sheet is at 850～910 ℃ of final annealings.
2. described production method according to claim 1 with cold-rolled pure iron plate of texture of coarse crystal, it is characterized in that: described chemical ingredients is (weight %): C＜0.01, Si＜0.1, Mn0.2～0.5, Al＜0.01, P0.05～0.1, S＜0.01, N＜0.005, O＜0.015, all the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98103523A CN1054400C (en) | 1998-07-31 | 1998-07-31 | Production method for cold-rolled pure iron plate with texture of coarse crystal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN98103523A CN1054400C (en) | 1998-07-31 | 1998-07-31 | Production method for cold-rolled pure iron plate with texture of coarse crystal |
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| CN1211625A true CN1211625A (en) | 1999-03-24 |
| CN1054400C CN1054400C (en) | 2000-07-12 |
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| CN98103523A Expired - Fee Related CN1054400C (en) | 1998-07-31 | 1998-07-31 | Production method for cold-rolled pure iron plate with texture of coarse crystal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096724B (en) * | 2006-06-28 | 2010-05-12 | 宝山钢铁股份有限公司 | Electromagnetic steel having excellent electromagnetic property and method for manufacturing same |
| CN104451385A (en) * | 2014-12-09 | 2015-03-25 | 抚顺特殊钢股份有限公司 | Low-carbon low-nitrogen and high-oxygen industrial pure iron and production method thereof |
| CN107083516A (en) * | 2017-03-02 | 2017-08-22 | 唐山钢铁集团有限责任公司 | A kind of Coarse Austenite grain steel and its production method |
| CN107794458A (en) * | 2016-08-30 | 2018-03-13 | 宝山钢铁股份有限公司 | Exempt from magnetized electromagnetic pure iron and its manufacture method with high warping resistance characteristic |
| CN114774789A (en) * | 2022-04-29 | 2022-07-22 | 鞍钢股份有限公司 | Electrical pure iron hot rolled plate with excellent plate shape and wide width and manufacturing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2634801B2 (en) * | 1986-07-18 | 1997-07-30 | 日本鋼管株式会社 | High magnetic flux density directional silicon iron plate with excellent iron loss characteristics |
| JP3162782B2 (en) * | 1992-03-05 | 2001-05-08 | 川崎製鉄株式会社 | Soft magnetic iron plate with excellent magnetic properties and method for producing the same |
-
1998
- 1998-07-31 CN CN98103523A patent/CN1054400C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096724B (en) * | 2006-06-28 | 2010-05-12 | 宝山钢铁股份有限公司 | Electromagnetic steel having excellent electromagnetic property and method for manufacturing same |
| CN104451385A (en) * | 2014-12-09 | 2015-03-25 | 抚顺特殊钢股份有限公司 | Low-carbon low-nitrogen and high-oxygen industrial pure iron and production method thereof |
| CN107794458A (en) * | 2016-08-30 | 2018-03-13 | 宝山钢铁股份有限公司 | Exempt from magnetized electromagnetic pure iron and its manufacture method with high warping resistance characteristic |
| CN107794458B (en) * | 2016-08-30 | 2019-09-06 | 宝山钢铁股份有限公司 | Exempt from magnetized electromagnetic pure iron and its manufacturing method with highly resistance bending characteristic |
| CN107083516A (en) * | 2017-03-02 | 2017-08-22 | 唐山钢铁集团有限责任公司 | A kind of Coarse Austenite grain steel and its production method |
| CN114774789A (en) * | 2022-04-29 | 2022-07-22 | 鞍钢股份有限公司 | Electrical pure iron hot rolled plate with excellent plate shape and wide width and manufacturing method thereof |
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| CN1054400C (en) | 2000-07-12 |
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