CN103409684A - High-strength cold-rolled magnetic pole steel and preparation method thereof - Google Patents
High-strength cold-rolled magnetic pole steel and preparation method thereof Download PDFInfo
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Abstract
The invention discloses high-strength cold-rolled magnetic pole steel and a preparation method thereof. The high-strength cold-rolled magnetic pole steel comprises the following chemical components in percentage by weight: 0.05%-0.07% of C, 1.00%-1.20% of Mn, 0.30%-0.50% of Si, not more than 0.015% of P, not more than 0.010% of S, 0.02%-0.07% of Als, not more than 0.040% of Ti, not more than 0.040% of Nb and the balance of Fe and other inevitable impurities. The preparation method of the high-strength cold-rolled magnetic pole steel disclosed by the invention comprises the following steps of high blast smelting, molten iron pre-treating, converter smelting, continuous casting, hot continuous casting, picking, cold continuous rolling, continuous annealing, flattening and finishing. The practice proves that the steel is high in strength and excellent in performance, and the preparation method is simple in production process, and high in production efficiency; meanwhile, the steel smelting cost is low.
Description
Technical field
The invention belongs to the 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 is all being greatly developed hydroelectric project to alleviate the energy shortage crisis, thereby the annual production of drive hydraulic generator unit is constantly soaring.Magnetic pole is the core component of hydraulic generator rotor, is formed by the cold rolled magnetic pole steel lamination assembling, and towards unit maximization, type variation and stableization development, the demand of high intensity levels cold rolled magnetic pole steel is increasing along with hydrogenerator.
At present, the method for annealing of producing cold rolled magnetic pole steel both at home and abroad is divided into two kinds of bell-type annealing and continuous annealings.Due to shortcomings such as the production cycle of bell-type annealing are long, production capacity is low, the product magnetic property is inhomogeneous, 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 be produced the above cold rolled magnetic pole steel of 500MPa.So high strength cold-rolled magnetic pole steel mainly adopts continuous annealing method.Application number is the manufacture method that 200910049782.7 Chinese invention patent discloses a kind of 500MPa cold rolled magnetic pole steel, this invention realizes improving magnetic pole steel intensity by steel, adding the alloying elements such as Nb, V and Ti, but in steel, increasing of precious alloy content must cause smelting cost to increase, simultaneously in order to guarantee fully separating out of the precipitated phase 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, and the production technique of its preparation method is simple, and production efficiency is high, and the 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 ratio is by weight counted: 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 are Fe and other inevitable impurity.
Preferably, the chemical composition of high strength cold-rolled magnetic pole steel percentage ratio is by weight counted: 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 are 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 ℃, and be 120 ~ 200s heat-up time, and finishing temperature is 890 ~ 930 ℃, rolls when the rear employing leading portion laminar flow type of cooling is cooled to 600 ~ 660 ℃ and batches;
During described cold continuous rolling, draft is controlled at 55 ~ 70%;
During described continuous annealing, soaking temperature is that 780 ~ 820 ℃, soaking time are 60s ~ 180s, 35 ~ 60 ℃/s speed of take after slowly cooling to 600 ~ 660 ℃ with 15 ~ 25 ℃/s speed carry out soon cold, carry out overaging processing, overaging treatment temp after being chilled to 400 ~ 460 ℃ as 350 ~ 450 ℃, overaging treatment time as 100 ~ 200s soon;
Preferably, the described unit elongation of controlling with steel when smooth is 0.9 ~ 1.5%.
Further, during continuous annealing, strip speed is 150 ~ 230m/min.
Again further preferably, during continuous annealing, the strip speed control mode is:
0.6mm during≤steel thickness<1.2mm, strip speed is 200 ~ 230m/min;
1.2mm during≤steel thickness<1.8mm, strip speed is 170 ~ 200m/min;
1.8mm during≤steel thickness<2.2mm, strip speed is 150 ~ 170m/min.
In high strength cold-rolled magnetic pole steel of the present invention, the control principle of the middle processing parameter of each component concentration control and preparation method thereof is as follows:
Magnetic pole steel Composition Design of the present invention adopts the 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 the steel plate prescribed strength, in steel, needs a certain amount of C; In steel, C has larger infringement to magnetic property as solid solution carbon or cementite simultaneously, so C content is difficult for too high.Mn can significantly improve steel plate yield strength and tensile strength as the displaced type solid solution element, but Mn content is between 0.15 ~ 3.0% the time, and steel plate magnetic induction density increases and reduces with Mn content, and therefore will control Mn content can not be too high.Si can obviously improve intensity and little on the magnetic property impact, but can reduce the plasticity of steel, and steel plate is become fragile, and affect processing characteristics and the surface quality of steel plate, so Si content is unsuitable too high.S and P belong to harmful element in steel, easily form the detrimental impurity such as TiS, MnS, intensity and the magnetic property of infringement steel plate, so in actual production, should reduce S, P content.Nb and Ti mainly exist with carbonitride form in steel, play the effect of crystal grain thinning and precipitation strength, can effectively improve the intensity of steel plate, but Nb and Ti belong to the metallic element that price is high, content increases can improve smelting cost, simultaneously magnetic property is also had to disadvantageous effect, therefore in steel, adds appropriate Nb and Ti, by technology controlling and process, effectively bring into play again the Microalloying Effect of Nb and Ti, play the effect that improves armor plate strength and guarantee 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 reduce smelting cost.
In preparation method of the present invention, adopt underannealing technique, during concrete preparation, the Heating temperature (1260 ~ 1300 ℃) adopted and heat-up time, (120 ~ 200s) can guarantee that heating steel billet is abundant, reach and organize complete austenitizing, adopt simultaneously suitable finishing temperature (890 ~ 930 ℃), coiling temperature (600 ~ 660 ℃) and the leading portion laminar flow type of cooling, give full play to microalloy element crystal grain thinning and precipitation strength effect, not only avoided crystal grain too to grow up but also guaranteed that carbonitride fully separated out, having guaranteed that steel plate had 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 ℃), simultaneously according to the corresponding strip speed of belt steel thickness coupling, strip speed has determined the length of annealing time, if annealing temperature is high, strip speed is slow, grain-size is excessive, and armor plate strength descends; And annealing temperature is too low, strip speed is fast, recrystallize is incomplete, can cause plate property inhomogeneous, affects 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 guarantee magnetic pole steel intensity and magnetic property.Preferably, when smooth, as adopt 0.9 ~ 1.5% unit elongation to carry out, can guarantee the strip shape quality of steel plate, eliminate the flatness defects such as steel plate wave shape, to improving armor plate strength, certain effect is arranged 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 that utilizes the inventive method to produce is: recrystallize ferrite+perlite+deformed microstructure, wherein the deformed microstructure of non-recrystallization can play the effect that improves armor plate strength.Through check, in production in enormous quantities, the yield strength of this steel plate all is greater than 650MPa, and tensile strength is greater than 690MPa, and unit elongation is greater than 15%, and magnetic induction B50 all is 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 has been listed the chemical component weight percentage composition (surplus is Fe and inevitable impurity) of the embodiment of the present invention 1 ~ 6 high strength cold-rolled magnetic pole steel.
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 |
According to following steps, prepared by the steel in above-described embodiment 1 ~ 6: 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 ℃, and be 120 ~ 200s heat-up time, and finishing temperature is 890 ~ 930 ℃, rolls when the rear employing leading portion laminar flow type of cooling is cooled to 600 ~ 660 ℃ and batches; During cold continuous rolling, draft is controlled at 55 ~ 70%; During continuous annealing, soaking temperature is that 780 ~ 820 ℃, soaking time are 60s ~ 180s, with 35 ~ 60 ℃/s speed, carry out cold soon after with 15 ~ 25 ℃/s quick-frozen, slowly cooling to 600 ~ 660 ℃, after being chilled to soon 400 ~ 460 ℃, carrying out overaging processing, overaging temperature and be 350 ~ 450 ℃, overaging time is 100 ~ 200s, wherein, each embodiment the part processing parameter in corresponding cold continuous rolling, continuous annealing planarization step as shown in table 2.
Table 2
Mechanical property to the resulting corresponding steel of above-mentioned 1 ~ 6 each embodiment detects, and detected result is as shown in table 3.
Table 3
As shown in Table 3, magnetic pole steel by continuous annealing method production of the present invention has very high yield strength and tensile strength, and unit elongation reaches more than 15%, can meet the process requirements of magnetic pole steel punching, magnetic induction B50 value all is greater than 1.55T simultaneously, illustrate that this magnetic pole steel has excellent magnetic characteristics, meet the magnetic property requirement of hydrogenerator to magnetic pole steel fully.
Claims (6)
1. high strength cold-rolled magnetic pole steel, it is characterized in that: its chemical composition percentage ratio is by weight counted: 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 are Fe and other inevitable impurity.
2. high strength cold-rolled magnetic pole steel according to claim 1, it is characterized in that: its chemical composition percentage ratio is by weight counted: 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 are Fe and other inevitable impurity.
3. the preparation method of the described high strength cold-rolled magnetic pole steel of claim 1, it is characterized in that: it 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 ℃, and be 120 ~ 200s heat-up time, and finishing temperature is 890 ~ 930 ℃, rolls when the rear employing leading portion laminar flow type of cooling is cooled to 600 ~ 660 ℃ and batches;
During described cold continuous rolling, draft is controlled at 55 ~ 70%;
During described continuous annealing, soaking temperature is that 780 ~ 820 ℃, soaking time are 60s ~ 180s, with 35 ~ 60 ℃/s speed, carry out after with 15 ~ 25 ℃/s speed, slowly cooling to 600 ~ 660 ℃ coldly soon, and carrying out overaging processing, overaging treatment temp after being chilled to soon 400 ~ 460 ℃ and be 350 ~ 450 ℃, overaging treatment time is 100 ~ 200s.
4. the preparation method of high strength cold-rolled magnetic pole steel according to claim 3 is characterized in that: described control when smooth is 0.9 ~ 1.5% with the unit elongation of steel.
5. the preparation method of high strength cold-rolled magnetic pole steel according to claim 3, it is characterized in that: during described continuous annealing, strip speed is 150 ~ 230m/min.
6. the preparation method of high strength cold-rolled magnetic pole steel according to claim 3, it is characterized in that: during described continuous annealing, the control mode of strip speed is:
When 0.6mm≤steel thickness<1.2mm, strip speed is 200 ~ 230m/min;
When 1.2mm≤steel thickness<1.8mm, strip speed is 170 ~ 200m/min;
When 1.8mm≤steel thickness<2.2mm, strip speed is 150 ~ 170m/min.
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Cited By (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 |
| CN107354376A (en) * | 2017-05-27 | 2017-11-17 | 唐山钢铁集团有限责任公司 | Roll-forming yield strength 550MPa levels cold-rolled steel sheet and production method |
| CN109161639A (en) * | 2018-09-29 | 2019-01-08 | 中信重工机械股份有限公司 | A kind of DT4 magnetic pole of 250MeV superconducting cyclotron main magnet, magnetic yoke steel smelting technique |
| CN112680655A (en) * | 2020-11-27 | 2021-04-20 | 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 |
| CN114196874A (en) * | 2020-09-18 | 2022-03-18 | 宝山钢铁股份有限公司 | 1000MPa cold-rolled super-strong steel tensile sample and manufacturing 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 |
| CN115537669A (en) * | 2022-11-08 | 2022-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of continuous annealing low-alloy high-strength cold-rolled steel plate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2013
- 2013-07-11 CN CN201310290115.4A patent/CN103409684B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (14)
| 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 |
| CN107354376A (en) * | 2017-05-27 | 2017-11-17 | 唐山钢铁集团有限责任公司 | Roll-forming yield strength 550MPa levels cold-rolled steel sheet and production method |
| CN109161639A (en) * | 2018-09-29 | 2019-01-08 | 中信重工机械股份有限公司 | A kind of DT4 magnetic pole of 250MeV superconducting cyclotron main magnet, magnetic yoke steel smelting technique |
| CN114196874A (en) * | 2020-09-18 | 2022-03-18 | 宝山钢铁股份有限公司 | 1000MPa cold-rolled super-strong steel tensile sample and manufacturing method thereof |
| CN112680655A (en) * | 2020-11-27 | 2021-04-20 | 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 |
| 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 |
| CN115537669A (en) * | 2022-11-08 | 2022-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method of continuous annealing low-alloy high-strength cold-rolled steel plate |
| 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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