CN103409684B - High strength cold-rolled magnetic pole steel - Google Patents
High strength cold-rolled magnetic pole steel Download PDFInfo
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- CN103409684B CN103409684B CN201310290115.4A CN201310290115A CN103409684B CN 103409684 B CN103409684 B CN 103409684B CN 201310290115 A CN201310290115 A CN 201310290115A CN 103409684 B CN103409684 B CN 103409684B
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Abstract
The invention discloses a kind of high strength cold-rolled magnetic pole steel and preparation method thereof.The chemical composition percentage of this steel is: C:0.05 ~ 0.07%, Mn:1.00 ~ 1.20%, Si:0.30 ~ 0.50%, P≤0.015%, S≤0.010%, Als:0.02 ~ 0.07%, Ti≤0.040%, Nb≤0.040%, and surplus is Fe and other inevitable impurity.The preparation method of high strength cold-rolled magnetic pole steel of the present invention, comprises the following steps: blast-furnace smelting, hot metal pretreatment, converter smelting, continuous casting, hot continuous rolling, pickling, cold continuous rolling, continuous annealing, smooth, finishing.Facts have proved, this hardness of steel is high, have excellent magnetic characteristics, the production technique of its preparation method is simple, and production efficiency is high, and steel smelting cost is cheap simultaneously.
Description
Technical field
The invention belongs to steel technical field, be specifically related to a kind of high strength cold-rolled magnetic pole steel and preparation method thereof.
Background technology
Water power is a kind of environment-friendly type, continuable electrical production method, and recent domestic all greatly developing hydroelectric project to alleviate energy shortage crisis, thus drives the annual production of turbine-generator units constantly to rise.Magnetic pole is the core component of hydraulic generator rotor, is formed by cold rolled magnetic pole steel lamination assembling, and along with hydrogenerator is towards unit maximization, type variation and stableization development, the demand of high intensity levels cold rolled magnetic pole steel is increasing.
At present, the method for annealing producing cold rolled magnetic pole steel is both at home and abroad divided into bell-type annealing and continuous annealing two kinds.Due to shortcomings such as the production cycle of bell-type annealing are long, production capacity is low, product magnetic property is uneven, mainly for the production of short run, other cold rolled magnetic pole steel of low intensity level, in prior art, bell-type annealing can't produce the cold rolled magnetic pole steel of more than 500MPa.So high strength cold-rolled magnetic pole steel mainly adopts continuous annealing method.Application number be 200910049782.7 Chinese invention patent disclose a kind of manufacture method of 500MPa cold rolled magnetic pole steel, this invention improves magnetic pole steel intensity by adding the alloying elements such as Nb, V and Ti to realize in steel, but increasing of precious alloy content must cause smelting cost to increase in steel, simultaneously in order to ensure the abundant precipitation of the precipitated phases such as NbC, TiC in annealing process, the method annealing temperature is low, annealing time is long, cause connecting the running efficiency of moving back unit not high, production efficiency is on the low side.
Summary of the invention
The object of the present invention is to provide a kind of high strength cold-rolled magnetic pole steel and preparation method thereof, this hardness of steel is high, have excellent magnetic characteristics, the production technique of its preparation method is simple, and production efficiency is high, and steel smelting cost is cheap simultaneously.
For achieving the above object, high strength cold-rolled magnetic pole steel of the present invention, its special character is: its chemical composition percentage is: C:0.05 ~ 0.07%, Mn:1.00 ~ 1.20%, Si:0.30 ~ 0.50%, P≤0.015%, S≤0.010%, Als:0.02 ~ 0.07%, Ti≤0.040%, Nb≤0.040%, and surplus is Fe and other inevitable impurity.
Preferably, the chemical composition percentage of high strength cold-rolled magnetic pole steel is: C:0.058 ~ 0.065%, Mn:1.00 ~ 1.15%, Si:0.40 ~ 0.45%, P≤0.012%, S≤0.010%, Als:0.04 ~ 0.06%, Ti≤0.035%, Nb≤0.035%, and surplus is Fe and other inevitable impurity.
The present invention also provides a kind of preparation method of high strength cold-rolled magnetic pole steel, its special character is, it comprises the following steps: blast-furnace smelting, hot metal pretreatment, converter smelting, continuous casting, hot continuous rolling, pickling, cold continuous rolling, continuous annealing, smooth, finishing, wherein:
During described hot continuous rolling, Heating temperature is 1260 ~ 1300 DEG C, and heat-up time is 120 ~ 200s, and finishing temperature is 890 ~ 930 DEG C, rolls when rear employing leading portion section cooling mode is cooled to 600 ~ 660 DEG C and batches;
During described cold continuous rolling, draft controls 55 ~ 70%;
During described continuous annealing, soaking temperature is 780 ~ 820 DEG C, soaking time is 60s ~ 180s, slowly cool to 600 ~ 660 DEG C with 15 ~ 25 DEG C/s speed after carry out rapid cooling with 35 ~ 60 DEG C/s speed, be chilled to 400 ~ 460 DEG C soon after carry out Wetted constructures, Wetted constructures temperature is 350 ~ 450 DEG C, the Wetted constructures time is for 100 ~ 200s;
Preferably, described smooth time control cincture steel unit elongation be 0.9 ~ 1.5%.
Further, during continuous annealing, strip speed is 150 ~ 230m/min.
Again further preferably, during continuous annealing, strip speed control mode is:
During 0.6mm≤steel thickness < 1.2mm, strip speed is 200 ~ 230m/min;
During 1.2mm≤steel thickness < 1.8mm, strip speed is 170 ~ 200m/min;
During 1.8mm≤steel thickness < 2.2mm, strip speed is 150 ~ 170m/min.
In high strength cold-rolled magnetic pole steel of the present invention, in each component concentration control and preparation method thereof, the control principle of processing parameter is as follows:
Magnetic pole steel Composition Design of the present invention adopts Nb-Ti composite micro-alloyed steel, and in steel, C is good solution strengthening element, and C content increases, and intensity rises, and for guaranteeing steel plate prescribed strength, needs a certain amount of C in steel; In steel, C has larger infringement to magnetic property as solid solution carbon or cementite simultaneously, and therefore C content is not easily too high.Mn can significantly improve steel plate yield strength and tensile strength as displaced type solid solution element, but Mn content between 0.15 ~ 3.0% time, steel plate magnetic induction density with Mn content increase and reduce, therefore will control Mn content can not be too high.Si can significantly improve intensity and affect magnetic property little, but can reduce the plasticity of steel, and steel plate is become fragile, affects processing characteristics and the surface quality of steel plate, therefore Si content is unsuitable too high.S and P belongs to harmful element in steel, easily forms the detrimental impurity such as TiS, MnS, and the intensity of infringement steel plate and magnetic property, therefore should reduce S, P content in actual production.Nb and Ti mainly exists with carbonitride form in steel, play the effect of crystal grain thinning and precipitation strength, effectively can improve the intensity of steel plate, but Nb and Ti belongs to the high metallic element of price, content increase can improve smelting cost, also has disadvantageous effect to magnetic property simultaneously, therefore in steel, adds appropriate Nb and Ti, effectively played the Microalloying Effect of Nb and Ti again by technology controlling and process, play the effect improving armor plate strength and ensure steel plate magnetic induction density.The chemical composition of high strength cold-rolled magnetic pole steel of the present invention is simple, does not need to carry out proof strength by improving alloy content, is conducive to reducing smelting cost.
In preparation method of the present invention, adopt underannealing technique, during concrete preparation, adopt Heating temperature (1260 ~ 1300 DEG C) and can ensure that heating steel billet is abundant heat-up time (120 ~ 200s), reach and organize complete austenitizing, adopt suitable finishing temperature (890 ~ 930 DEG C) simultaneously, coiling temperature (600 ~ 660 DEG C) and leading portion section cooling mode, give full play to microalloy element crystal grain thinning and precipitation strength effect, not only excessive grain is avoided to grow up but also ensure that carbonitride is fully separated out, ensure that steel plate has enough intensity and good magnetic property.
During preparation, annealing temperature and annealing time all have a significant impact magnetic pole steel product intensity and magnetic property, the present invention adopts suitable annealing temperature (780 ~ 820 DEG C), mate corresponding strip speed according to belt steel thickness simultaneously, strip speed determines the length of annealing time, if annealing temperature is high, strip speed is slow, grain-size is excessive, and armor plate strength declines; And annealing temperature is too low, strip speed fast, recrystallize is incomplete, plate property can be caused uneven, affect magnetic property and steel plate punched quality.Under above-mentioned annealing temperature condition, controlling strip speed is the matched well that 150 ~ 230m/min can ensure magnetic pole steel intensity and magnetic property.Preferably, time smooth, as adopted 0.9 ~ 1.5% unit elongation to carry out, the strip shape quality of steel plate can be ensured, eliminating the flatness defects such as steel plate wave shape have certain effect to raising armor plate strength simultaneously.
This preparation method annealing time is short, unit operation speed is fast, production efficiency is high, is the method for the high strength cold-rolled magnetic pole steel of a kind of High-efficient Production.
The cold rolled magnetic pole steel metallographic structure utilizing the inventive method to produce is: recrystallize ferrite+perlite+deformed microstructure, and wherein the deformed microstructure of non-recrystallization can play the effect improving armor plate strength.Through inspection, in production in enormous quantities, the yield strength of this steel plate is all greater than 650MPa, and tensile strength is greater than 690MPa, and unit elongation is greater than 15%, and magnetic induction B50 is all greater than 1.55T.
Embodiment
Below in conjunction with specific embodiment, high strength cold-rolled magnetic pole steel of the present invention and preparation method thereof is described in further detail.
Table 1 lists the chemical component weight percentage composition (surplus is Fe and inevitable impurity) of the high strength cold-rolled magnetic pole steel of the embodiment of the present invention 1 ~ 6.
Table 1
| Embodiment | C | Mn | Si | P | S | Als | Ti | Nb |
| 1 | 0.062 | 1.13 | 0.41 | 0.011 | 0.005 | 0.048 | 0.032 | 0.026 |
| 2 | 0.058 | 1.09 | 0.45 | 0.012 | 0.004 | 0.053 | 0.035 | 0.029 |
| 3 | 0.067 | 1.15 | 0.34 | 0.009 | 0.008 | 0.031 | 0.035 | 0.031 |
| 4 | 0.052 | 1.18 | 0.44 | 0.012 | 0.005 | 0.042 | 0.038 | 0.030 |
| 5 | 0.065 | 1.07 | 0.47 | 0.011 | 0.008 | 0.060 | 0.029 | 0.035 |
| 6 | 0.059 | 1.15 | 0.34 | 0.013 | 0.007 | 0.035 | 0.037 | 0.031 |
Steel in above-described embodiment 1 ~ 6 is prepared according to following steps: blast-furnace smelting, hot metal pretreatment, converter smelting, continuous casting, hot continuous rolling, pickling, cold continuous rolling, continuous annealing, smooth, finishing.Wherein, during hot continuous rolling, Heating temperature is 1260 ~ 1300 DEG C, and heat-up time is 120 ~ 200s, and finishing temperature is 890 ~ 930 DEG C, rolls when rear employing leading portion section cooling mode is cooled to 600 ~ 660 DEG C and batches; During cold continuous rolling, draft controls 55 ~ 70%; During continuous annealing, soaking temperature is 780 ~ 820 DEG C, soaking time is 60s ~ 180s, slowly cool to 600 ~ 660 DEG C with 15 ~ 25 DEG C/s quick-frozen after carry out rapid cooling with 35 ~ 60 DEG C/s speed, carry out Wetted constructures after being chilled to 400 ~ 460 DEG C soon, overaging temperature is 350 ~ 450 DEG C, the overaging time is 100 ~ 200s, wherein, the some processes parameter in cold continuous rolling, continuous annealing planarization step corresponding to each embodiment is as shown in table 2.
Table 2
Detect the mechanical property of the corresponding steel that above-mentioned 1 ~ 6 each embodiment obtains, detected result is as shown in table 3.
Table 3
As shown in Table 3, the magnetic pole steel produced by continuous annealing method of the present invention has very high yield strength and tensile strength, and unit elongation reaches more than 15%, the process requirements of magnetic pole steel punching can be met, magnetic induction B50 value is all greater than 1.55T simultaneously, illustrate that this magnetic pole steel has excellent magnetic characteristics, meet the magnetic property requirements of hydrogenerator to magnetic pole steel completely.
Claims (5)
1. a high strength cold-rolled magnetic pole steel, it is characterized in that: its chemical composition percentage is: C:0.05 ~ 0.07%, Mn:1.00 ~ 1.20%, Si:0.30 ~ 0.50%, P≤0.015%, S≤0.010%, Als:0.02 ~ 0.07%, Ti≤0.040%, Nb≤0.040%, surplus is Fe and other inevitable impurity; Its preparation method, comprises the following steps successively: blast-furnace smelting, hot metal pretreatment, converter smelting, continuous casting, hot continuous rolling, pickling, cold continuous rolling, continuous annealing, smooth, finishing, wherein:
During described hot continuous rolling, Heating temperature is 1260 ~ 1300 DEG C, and heat-up time is 120 ~ 200s, and finishing temperature is 890 ~ 930 DEG C, rolls when rear employing leading portion section cooling mode is cooled to 600 ~ 660 DEG C and batches;
During described cold continuous rolling, draft controls 55 ~ 70%;
During described continuous annealing, soaking temperature is 780 ~ 820 DEG C, soaking time is 60s ~ 180s, slowly cool to 600 ~ 660 DEG C with 15 ~ 25 DEG C/s speed after carry out rapid cooling with 35 ~ 60 DEG C/s speed, carry out Wetted constructures after being chilled to 400 ~ 460 DEG C soon, Wetted constructures temperature be 350 ~ 450 DEG C, the Wetted constructures time is 100 ~ 200s.
2. high strength cold-rolled magnetic pole steel according to claim 1, it is characterized in that: its chemical composition percentage is: C:0.058 ~ 0.065%, Mn:1.00 ~ 1.15%, Si:0.40 ~ 0.45%, P≤0.012%, S≤0.010%, Als:0.04 ~ 0.06%, Ti≤0.035%, Nb≤0.035%, surplus is Fe and other inevitable impurity.
3. high strength cold-rolled magnetic pole steel according to claim 1 or 2, is characterized in that: described smooth time the unit elongation of control cincture steel be 0.9 ~ 1.5%.
4. high strength cold-rolled magnetic pole steel according to claim 1 or 2, is characterized in that: during described continuous annealing, and strip speed is 150 ~ 230m/min.
5. high strength cold-rolled magnetic pole steel according to claim 1 or 2, is characterized in that: during described continuous annealing, the control mode of strip speed is:
As 0.6mm≤steel thickness < 1.2mm, strip speed is 200 ~ 230m/min;
As 1.2mm≤steel thickness < 1.8mm, strip speed is 170 ~ 200m/min;
As 1.8mm≤steel thickness < 2.2mm, strip speed is 150 ~ 170m/min.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104294151A (en) * | 2014-11-12 | 2015-01-21 | 武汉钢铁(集团)公司 | 600MPa-grade cold rolling magnetic steel and production method thereof |
| CN104878292A (en) * | 2015-06-16 | 2015-09-02 | 武汉钢铁(集团)公司 | Cold-rolled magnetic pole steel with yield strength not less than 400 MPa and production method of cold-rolled magnetic pole steel |
| CN105714186A (en) * | 2016-04-01 | 2016-06-29 | 唐山钢铁集团有限责任公司 | Continuous annealing low-alloy and high-strength steel plate and production method thereof |
| CN106834941A (en) * | 2017-01-20 | 2017-06-13 | 唐山钢铁集团有限责任公司 | A kind of hot press-formed steel and its production method |
| CN107299281A (en) * | 2017-05-16 | 2017-10-27 | 唐山钢铁集团有限责任公司 | A kind of inexpensive 650MPa grade high-strengths steel band and preparation method thereof |
| CN107354376B (en) * | 2017-05-27 | 2019-05-28 | 唐山钢铁集团有限责任公司 | Roll-forming 550MPa grades of cold-rolled steel sheets of yield strength and production method |
| CN109161639B (en) * | 2018-09-29 | 2020-04-21 | 中信重工机械股份有限公司 | Smelting process of DT4 magnetic pole and magnetic yoke steel of main magnet of 250MeV superconducting cyclotron |
| CN114196874B (en) * | 2020-09-18 | 2022-06-28 | 宝山钢铁股份有限公司 | 1000MPa cold-rolled super-strong steel tensile sample and manufacturing method thereof |
| CN112680655B (en) * | 2020-11-27 | 2022-06-14 | 邯郸钢铁集团有限责任公司 | 700 MPa-grade low-alloy high-strength cold-rolled steel plate for automobile and preparation method thereof |
| CN115478221A (en) * | 2022-09-20 | 2022-12-16 | 武汉钢铁有限公司 | 450 MPa-level magnetic pole steel based on CSP (compact strip production) process and manufacturing method thereof |
| CN115537669B (en) * | 2022-11-08 | 2024-02-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of continuously annealed low-alloy high-strength cold-rolled steel plate |
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| CN1904114A (en) * | 2006-07-31 | 2007-01-31 | 武汉钢铁(集团)公司 | Production method of 350 MPa grade cold rolled magnetic pole steel |
| CN102876869A (en) * | 2012-09-21 | 2013-01-16 | 马钢(集团)控股有限公司 | Production method for cold rolled magnetic pole steel with yield strength of 250 MPa |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1904114A (en) * | 2006-07-31 | 2007-01-31 | 武汉钢铁(集团)公司 | Production method of 350 MPa grade cold rolled magnetic pole steel |
| CN102876869A (en) * | 2012-09-21 | 2013-01-16 | 马钢(集团)控股有限公司 | Production method for cold rolled magnetic pole steel with yield strength of 250 MPa |
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Effective date of registration: 20170717 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Hubei, Wuhan, Wuchang Friendship Road, No. 999, block A, floor 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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