CN102373366A - Method for improving coarse grains on surface of non-oriented silicon steel - Google Patents

Method for improving coarse grains on surface of non-oriented silicon steel Download PDF

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Publication number
CN102373366A
CN102373366A CN2010102657823A CN201010265782A CN102373366A CN 102373366 A CN102373366 A CN 102373366A CN 2010102657823 A CN2010102657823 A CN 2010102657823A CN 201010265782 A CN201010265782 A CN 201010265782A CN 102373366 A CN102373366 A CN 102373366A
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normalizing
silicon steel
steel
oriented silicon
steel plate
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陈凌峰
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Baoshan Iron and Steel Co Ltd
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Baoshan Iron and Steel Co Ltd
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Priority to CN2010102657823A priority Critical patent/CN102373366A/en
Priority to EP11819314A priority patent/EP2530173A1/en
Priority to MX2012010150A priority patent/MX2012010150A/en
Priority to JP2012549246A priority patent/JP2013517380A/en
Priority to RU2012136591/02A priority patent/RU2012136591A/en
Priority to PCT/CN2011/073358 priority patent/WO2012024939A1/en
Publication of CN102373366A publication Critical patent/CN102373366A/en
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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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/28—Normalising

Abstract

The invention relates to a method for improving coarse grains on the surface of non-oriented silicon steel. The method comprises the following steps: 1) smelting and casting, wherein the non-oriented silicon steel comprises the following components by weight percent: 0.001-0.005% of C, 0.1%-1.80% of Si, 0.10%-0.80% of Mn, not more than 0.04% of P, 0.20%-0.80% of Al, not more than 0.005% of S, not more than 0.005% of N and the balance of Fe; and further performing smelting and RH (Ruhrstahl Heraeus) refining treatment, and casting molten steel into a blank; 2) carrying out hot-rolling to form a steel plate; 3) normalizing, wherein the normalizing temperature is 800-900 DEG C and the normalizing and uniform heating time is 15-30 seconds; controlling the oxygen content in a normalizing furnace below 0.5%; and controlling the ratio of maximum grain size in the steel plate after normalizing to average grain size below 3; and 4) acid-cleaning, cold-rolling, annealing and coating so as to get a non-oriented silicon steel product. Under existing conditions, the problem of the coarse grains on the surface of the non-oriented silicon steel can be solved under the situations of not increasing the heat treatment process step and not performing parallel heat processing.

Description

A kind of macrocrystalline method in non orientating silicon steel surface of improving
Technical field
The present invention relates to the ME of non orientating silicon steel, particularly a kind of macrocrystalline method in non orientating silicon steel surface of improving.
Background technology
The component content of existing non orientating silicon steel product is: C≤0.005%, Si:0.1%～1.80%, Mn:0.10%～0.80%; Below the P:0.04%, Al:0.20%～0.80%, S≤below 0.005%; N≤below 0.005%, surplus is Fe and inevitable inclusion.The composition of above-mentioned molten steel obtains through converter, RH refining treatment, after pouring molten steel becomes base, and through hot rolling, normalizing, pickling, cold rolling, annealing, the non orientating silicon steel product that obtains after the coating.The non-constant of its surface quality of products, as shown in Figure 1, there is serious surperficial coarse-grain problem.
At present, the scheme of solution steel products coarse-grain problem mainly contains following several kinds:
The disclosed a kind of press forging of Chinese patent CN1073982 " dual preheating normalizing " pretreatment technology has overcome existing technology and can not fully make grain refining and can not obviously improve coarse-grain and mixed crystal problem.It comprises preheating and normalizing operation, it is characterized in that normalizing before, press forging is carried out preheating, preheating temperature is 600～710 ℃, its characteristics: 1, refinement crystal grain; 2, improve coarse-grain and mixed crystal, reached technical requirements; 3, utilize existing device to realize.But this technology can be applicable to the thermal treatment in advance to the Large-scale Forging casting die.Do not adopt this art breading if there is the orientation coil of strip, increased heat treatment step one time, cost rises.
Chinese patent CN1804056 discloses " a kind of method for preventing coarse grain of deformed high temperature alloy "; It comprises two cover measures; First cover is the forging process preventive measures; Mainly be to carry out computer simulation, confirm the deflection at superalloy forging minimal deformation position, and strict control Dan Huoci effective deformation position produces the deflection of recrystallize with the commercial simulation software of DEFORM2D.Second cover is the conditioning heat treatment preventive measures, mainly is that the strict Forge Heating temperature of grasping is lower than 1160 ℃, when the first cover measure of use can not prove effective or produce accident fully, adopts the second cover measure.The production technique that this invention is formulated can make the macroscopic coarse grain of wrought superalloy product reach qualified level; Be mainly used in the hydraulic pressure and the hammering distortion of common superalloy; The normalizing treatment process of inapplicable non orientating silicon steel, processing can not be forged and pressed distortion hot-work simultaneously because non orientating silicon steel twists in normalizing.
Chinese patent CN1733946 discloses " a kind of subcritical steam turbine bolting steel fine grain processing method "; It is characterized in that before the material modifier treatment, increasing a thermal treatment; The steps include: the first step, material is heated to 920 ℃ ± 20 ℃, be incubated 0.5～2 hour; In second step,, be incubated 0.5～2 hour with per hour 100 ℃ ± 20 ℃ speed of cooling slow cooling to 750 ℃ ± 30 ℃; In the 3rd step, air cooling is to room temperature.But; This invention is before the modifier treatment of 20Cr1MolVNbTiB steel, to increase a thermal treatment; Make material before heat treatment quenching and tempering, organize equalization; Material can obtain whole fine grained textures after modifier treatment, thereby has solved the coarse-grain defective of 20Cr1MolVNbTiB steel, can not solve the coarse-grain problem of the non orientating silicon steel normalizing process generation that is run into.
Above-mentioned three kinds of methods are summed up as two kinds of thinkings: a kind of is through logical twice thermal treatment process, makes grain refining, improves the coarse-grain problem.Another kind is in the heat treated while, and additional with critical forging and pressing distortion, the control recrystallize is effectively solved the problem of macroscopic coarse grain.
But above-mentioned three kinds of methods are not suitable for the non orientating silicon steel product through normalizing, and major cause is that the non orientating silicon steel product can not carry out the thermal distortion processing treatment in the heat treated while of normalizing; If adopt the grain-size of twice thermal treatment crystal grain thinning, can increase cost.
Summary of the invention
The object of the present invention is to provide a kind of macrocrystalline method in non orientating silicon steel surface of improving; Under existing objective condition; Do not increase heat treatment step, under the hot-work situation that does not yet walk abreast, solve non orientating silicon steel surface coarse-grain problem; Under the prerequisite of the electromagnetic performance that does not influence product, satisfy the surface quality requirement of non orientating silicon steel.
For achieving the above object, technical scheme of the present invention is:
A kind of macrocrystalline method in non orientating silicon steel surface of improving, it comprises the steps:
1) smelts, casts
The composition weight percent of non orientating silicon steel is: C 0.001～0.005%, Si:0.1%～1.80%, Mn:0.10%～0.80%; P≤0.04%, Al:0.20%～0.80%, S≤0.005%; N≤0.005%, surplus are Fe and inevitable inclusion;
Press mentioned component through smelting, RH refining treatment, molten steel casting becomes base;
2) be rolled into steel plate;
3) normalizing
The normalizing temperature is controlled at 800 ℃～900 ℃, and the normalizing soaking time is controlled at 15S～30S; Control for Oxygen Content in the normalizing furnace is below 0.5%; Maximum crystal grain after the normalizing in the steel plate is controlled at below 3 with the ratio of average grain size;
4) pickling, cold rolling, annealing, coating obtain the non orientating silicon steel product.
Further, the ratio of the maximum crystal grain in the steel plate and average grain size is controlled at below 2 after the normalizing.
The present invention is directed to non orientating silicon steel product product and have surperficial coarse-grain problem, adopt normalizing to handle to steel plate, the normalizing temperature is controlled at 800 ℃～900 ℃, and the normalizing soaking time is controlled at 15S～30S.The normalizing temperature is too high, and overlong time causes grain structure to be grown up unusually, after cold rolling and annealing, produces serious coarse-grain problem.The normalizing temperature is low excessively, and the time is too short, and the rolling deformation tissue after the hot rolling can not reach the effect of normalizing recrystallize, the corrugated defective occurs, simultaneously the magnetic strength deterioration.Be that the non orientating silicon steel of mentioned component and technology approach exists critical normalizing temperature and time zone in the normalizing treating processes, surpass or do not reach this critical normalizing temperature and time zone, must cause crystal grain to be grown up unusually, surperficial macrocrystalline quality problems take place.
Maximum crystal grain after the normalizing in the steel plate is controlled at below 3 with the ratio of average grain size, and the ratio of the grain-size that normalizing is handled is excessive, is easy to generate surperficial coarse-grain problem, preferably is controlled at below 2.
For the Control for Oxygen Content in the normalizing furnace below 0.5%.Too high oxygen level causes surface oxide layer to become big, and the pickling difficulty influences surface quality.
Beneficial effect of the present invention
1, the present invention does not adopt thermal treatment process twice, and technological operation is easy to implement, and the manufacturing processed energy consumption reduces.
2, the present invention handles through normalizing, the orientation free silicon steel plate surface quality be improved significantly, efficiently solve the surperficial coarse-grain defective of non orientating silicon steel finished product.
Description of drawings
Fig. 1 is the surperficial coarse-grain metallograph of comparative example finished product.
Fig. 2 is an embodiment of the invention finished surface metallograph.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is made more detailed description.
The chemical ingredients of the embodiment of the invention and comparative example steel is seen table 1, and normalizing process is referring to table 2.With molten steel through converter, RH refining treatment, pour into base after, through hot rolling, normalizing, pickling, cold rolling, annealing obtains the non-oriented electrical steel product after the coating.Wherein, slab rolls into the band steel of 2.6mm through hot rolling; Hot rolled strip with 2.6mm carries out the normalizing processing then; Band steel after normalizing is handled carries out final annealing and coating again through the band steel of cold rolling one-tenth 0.5mm, and the plate temperature of the final annealing after cold rolling is 820 ℃, and annealing time is controlled at 13～15S, obtains cold rolling electro-magnetic steel plate.The surperficial metallographic of comparative example and embodiment gained cold-rolled non-oriented silicon steel is seen Fig. 1 and Fig. 2.
Table 1 unit: weight percent
C Si Mn Al S P N Fe
Embodiment 1 0.005 0.250 0.250 0.20 0.003 0.04 0.003 Surplus
Embodiment 2 0.003 0.760 0.410 0.39 0.004 0.03 0.002 Surplus
Embodiment 3 0.004 1.210 0.590 0.61 0.002 0.04 0.003 Surplus
Embodiment 4 0.003 1.760 0.790 0.78 0.003 0.02 0.004 Surplus
Embodiment 5 0.002 0.270 0.430 0.59 0.004 0.01 0.005 Surplus
Embodiment 6 0.003 0.710 0.220 0.76 0.005 0.04 0.002 Surplus
Embodiment 7 0.004 1.260 0.780 0.22 0.005 0.03 0.003 Surplus
Embodiment 8 0.001 1.740 0.610 0.42 0.001 0.02 0.004 Surplus
Comparative example 1 0.001 0.240 0.220 0.26 0.004 0.04 0.002 Surplus
Comparative example 2 0.006 0.730 0.430 0.41 0.005 0.02 0.005 Surplus
Comparative example 3 0.005 1.240 0.580 0.63 0.002 0.01 0.004 Surplus
Comparative example 4 0.003 1.780 0.760 0.79 0.003 0.04 0.003 Surplus
Comparative example 5 0.002 0.260 0.420 0.54 0.006 0.06 0.005 Surplus
Comparative example 6 0.004 1.770 0.220 0.79 0.001 0.03 0.001 Surplus
Table 2
Figure BSA00000247557700051
Can be found out that by table 2, Fig. 1 and Fig. 2 the surface quality of embodiment gained steel plate obviously is superior to the surface quality of comparative example gained steel plate, the surperficial coarse-grain defective of finished product has obtained solving fully.

Claims (2)

1. one kind is improved the macrocrystalline method in non orientating silicon steel surface, and it comprises the steps:
1) smelts, casts
The composition weight percent of non orientating silicon steel is: C 0.001～0.005%, Si:0.1%～1.80%, Mn:0.10%～0.80%; P≤0.04%, Al:0.20%～0.80%, S≤0.005%; N≤0.005%, surplus are Fe and inevitable inclusion;
Press mentioned component through smelting, RH refining treatment, molten steel casting becomes base;
2) be rolled into steel plate;
3) normalizing
The normalizing temperature is controlled at 800 ℃～900 ℃, and the normalizing soaking time is controlled at 15S～30S; Control for Oxygen Content in the normalizing furnace is below 0.5%; Maximum crystal grain after the normalizing in the steel plate is controlled at below 3 with the ratio of average grain size;
4) pickling, cold rolling, annealing, coating obtain the non orientating silicon steel product.
2. the macrocrystalline method in non orientating silicon steel surface of improving as claimed in claim 1 is characterized in that the maximum crystal grain after the normalizing in the steel plate is controlled at below 2 with the ratio of average grain size.
CN2010102657823A 2010-08-26 2010-08-26 Method for improving coarse grains on surface of non-oriented silicon steel Pending CN102373366A (en)

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Application Number Priority Date Filing Date Title
CN2010102657823A CN102373366A (en) 2010-08-26 2010-08-26 Method for improving coarse grains on surface of non-oriented silicon steel
EP11819314A EP2530173A1 (en) 2010-08-26 2011-04-27 Method for improving surface coarse grain of non-oriented silicon steel
MX2012010150A MX2012010150A (en) 2010-08-26 2011-04-27 Method for improving surface coarse grain of non-oriented silicon steel.
JP2012549246A JP2013517380A (en) 2010-08-26 2011-04-27 Method for improving coarse crystal grains of non-oriented silicon steel
RU2012136591/02A RU2012136591A (en) 2010-08-26 2011-04-27 METHOD FOR REDUCING THE SIZE OF LARGE CRYSTAL GRAINS ON THE SURFACE OF NON-TEXTURED ELECTRICAL STEEL
PCT/CN2011/073358 WO2012024939A1 (en) 2010-08-26 2011-04-27 Method for improving surface coarse grain of non-oriented silicon steel

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CN103255274A (en) * 2012-08-10 2013-08-21 新万鑫（福建）精密薄板有限公司 Production method of general oriented silicon steel with twice cold rolling changed into one time cold rolling
CN103667879A (en) * 2013-11-27 2014-03-26 武汉钢铁(集团)公司 Non-oriented electrical sheet with superior magnetic and mechanical properties, and production method of non-oriented electrical sheet
US20150013847A1 (en) * 2012-03-09 2015-01-15 Baoshan Iron & Steel Co., Ltd. Method for Producing Silicon Steel Normalizing Substrate
EP2832888A4 (en) * 2012-03-26 2015-09-30 Baoshan Iron & Steel Unoriented silicon steel and method for manufacturing same
CN105779731A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Hot-rolled plate normalizing process for improving electromagnetic performance of low-grade non-oriented electrical steel
CN105925884A (en) * 2016-05-30 2016-09-07 宝山钢铁股份有限公司 High-magnetic-induction low-iron-loss no-oriented silicon steel sheet and manufacturing method thereof
CN106676237A (en) * 2016-12-14 2017-05-17 北京首钢股份有限公司 Method for eliminating non-oriented electrical steel surface crack defects
CN113403455A (en) * 2021-06-17 2021-09-17 张家港扬子江冷轧板有限公司 Production method of non-oriented silicon steel

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US20150013847A1 (en) * 2012-03-09 2015-01-15 Baoshan Iron & Steel Co., Ltd. Method for Producing Silicon Steel Normalizing Substrate
US9822423B2 (en) * 2012-03-09 2017-11-21 Baoshan Iron & Steel, Co., Ltd. Method for producing silicon steel normalizing substrate
EP2832888A4 (en) * 2012-03-26 2015-09-30 Baoshan Iron & Steel Unoriented silicon steel and method for manufacturing same
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CN103667879A (en) * 2013-11-27 2014-03-26 武汉钢铁(集团)公司 Non-oriented electrical sheet with superior magnetic and mechanical properties, and production method of non-oriented electrical sheet
CN105779731A (en) * 2014-12-23 2016-07-20 鞍钢股份有限公司 Hot-rolled plate normalizing process for improving electromagnetic performance of low-grade non-oriented electrical steel
CN105925884A (en) * 2016-05-30 2016-09-07 宝山钢铁股份有限公司 High-magnetic-induction low-iron-loss no-oriented silicon steel sheet and manufacturing method thereof
CN106676237A (en) * 2016-12-14 2017-05-17 北京首钢股份有限公司 Method for eliminating non-oriented electrical steel surface crack defects
CN113403455A (en) * 2021-06-17 2021-09-17 张家港扬子江冷轧板有限公司 Production method of non-oriented silicon steel
CN113403455B (en) * 2021-06-17 2024-03-19 张家港扬子江冷轧板有限公司 Production method of unoriented silicon steel

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MX2012010150A (en) 2013-01-22
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JP2013517380A (en) 2013-05-16
EP2530173A1 (en) 2012-12-05

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Application publication date: 20120314