WO2017206753A1 - 一种高磁感、低铁损无取向硅钢片及其制造方法 - Google Patents
一种高磁感、低铁损无取向硅钢片及其制造方法 Download PDFInfo
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
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- 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
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
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- C—CHEMISTRY; METALLURGY
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- 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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- 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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
Definitions
- the invention relates to a non-oriented silicon steel sheet, in particular to a high magnetic induction, low iron loss non-oriented silicon steel sheet and a manufacturing method thereof, in particular to a high magnetic induction which is relatively inexpensive to manufacture without normalization treatment or intermediate annealing of a cover furnace.
- Low iron loss non-oriented silicon steel sheet and its manufacturing method in particular to a high magnetic induction which is relatively inexpensive to manufacture without normalization treatment or intermediate annealing of a cover furnace.
- Electromagnetic performance commonly known as low iron loss and high magnetic inductance, meets the urgent need for high efficiency, energy saving and environmental protection of these electrical products.
- the Japanese patent JP2015515539A has a Si content of 2.5 to 4.0% and an Al content of 0.5 to 1.5%.
- Si and Al contents increase, the material iron loss rapidly decreases, but the material magnetic inductance also rapidly decreases, and is also prone to cold. An abnormal situation such as a broken belt.
- Chinese patent CN104399749A discloses a method for preventing edge cracking and brittle fracture of steel with ⁇ 3.5% Si content, improving the magnetic properties of the silicon steel sheet while making the steel sheet edgeless during cold rolling, but even so The brittle breakage rate is still 0.15%, and the equipment function accuracy is very high.
- Chinese patent CN103014503A added 0.20 to 0.45% (Sn+Cu) to the steel, and improved the texture of the material by grain boundary segregation, and obtained a good magnetic feeling, but Sn and Cu are expensive metals, which greatly increase the manufacturing cost, and Cu also easily causes quality defects on the surface of the strip.
- Japanese Patent Laid-Open No. 10-25554 improves the magnetic induction of materials by increasing the ratio of Al/(Si+Al) under the premise that the total amount of Si and Al is constant, but the iron loss of the material decreases with the increase of Al content and Si content. Deterioration begins to occur and the mechanical properties of the material decrease.
- normalization or hood furnace intermediate annealing is an effective method to improve the material iron loss and magnetic induction. It is widely used in the production of high-efficiency and high-grade non-oriented silicon steel sheets. Effectively reduce the iron loss of materials and greatly improve the magnetic induction of materials.
- the disadvantage is the introduction of new production equipment, which greatly increases the manufacturing cost, and prolongs the manufacturing and delivery cycle of materials, bringing the production site technology and quality management. New troubles.
- the electromagnetic properties of the material; or the use of rough rolling and large rolling, and the use of rough roll rolling and high temperature coiling, can also obtain high-grade non-oriented electrical steel with high magnetic sensation; if it has hot rolling flattening function, and often
- the annealing treatment can also obtain a high magnetic induction non-oriented silicon steel.
- the object of the present invention is to provide a high magnetic induction, low iron loss non-oriented silicon steel sheet and a method for manufacturing the same, the non-oriented silicon steel sheet has high magnetic induction, low iron loss, no precious metal in its chemical composition, and the manufacturing process is not It requires a normalization treatment or an intermediate annealing of a hood furnace, and the manufacturing cost is relatively low, and the production process is stable.
- a high magnetic induction and low iron loss non-oriented silicon steel sheet whose chemical composition mass percentage is: C ⁇ 0.005%, Si: 0.1 to 1.6%, Mn: 0.1 to 0.5%, P ⁇ 0.2%, S ⁇ 0.004%, Al ⁇ 0.003%, N ⁇ 0.005%, Nb ⁇ 0.004%, V ⁇ 0.004%, Ti ⁇ 0.003%, and the rest are Fe and unavoidable impurities, and the above elements simultaneously satisfy the following relationship: 120 ⁇ [Mn] / [ S] ⁇ 160, [Nb] / 93 + [V] / 51 + [Ti] / 48 + [Al] / 27 ⁇ [C] / 12 + [N] / 14.
- non-oriented silicon steel sheet has the following electromagnetic properties:
- the Si content is 0.01% ⁇ Si ⁇ 0.30%, corresponding to the A grade steel grade, the magnetic induction B 50 ⁇ 1.76T, the iron loss P 15/50 ⁇ 7.00W/kg;
- the magnetic property B 50 ⁇ 1.70T and the iron loss P 15/50 ⁇ 4.00 W/kg are corresponding to the D grade steel grade.
- C:C strongly inhibits the growth of the finished grain, and it is easy to combine with Nb, V, Ti, etc. to form fine precipitates, thereby causing loss increase and magnetic aging, so the C content must be strictly controlled to be 0.005% or less.
- Si:Si can increase the resistivity of the matrix and effectively reduce the iron loss of the steel.
- the Si content is higher than 1.6%, the magnetic induction of the steel is remarkably lowered; and when it is less than 0.1%, the iron loss is not greatly reduced. Therefore, the present invention controls the Si content to be 0.1 to 1.6%.
- Mn combines with S to form MnS, which can effectively reduce the damage to magnetic properties, improve the surface state of electrical steel, and reduce hot brittleness. Therefore, it is necessary to add a Mn content of 0.1% or more, and a Mn content of more than 0.5% or more easily breaks the recrystallization texture and greatly increases the manufacturing cost of the steel. Therefore, the present invention controls the Mn content to be 0.1 to 0.5%.
- the present invention controls the P content to be 0.2% or less.
- the present invention controls the S content to be 0.004% or less.
- Al is an element for increasing resistance and is used for deep deoxidation of electrical steel.
- the Al content is more than 0.003%, it is difficult to cast continuous casting, and the magnetic induction is remarkably lowered. Therefore, the present invention controls the Al content to be 0.003% or less.
- the present invention controls the N content to be 0.005% or less.
- the present invention controls the Nb content to be 0.004% or less.
- the present invention controls the V content to be 0.004% or less.
- the present invention controls the Ti content to be 0.003% or less.
- the method for manufacturing a high magnetic induction and low iron loss non-oriented silicon steel sheet according to the present invention comprises the following steps Step:
- the cooling rate is controlled to be 2.5 to 20 ° C / min during the cooling process of the slab surface temperature from 1100 ° C to 700 ° C;
- the slab is heated in a heating furnace to control the temperature of the slab into the furnace ⁇ 600 ° C;
- step 2) the slab enters the furnace temperature ⁇ 300 ° C.
- non-oriented silicon steel sheet prepared by the invention has the following electromagnetic properties:
- the Si content is 0.01% ⁇ Si ⁇ 0.30%, corresponding to the A grade steel grade, the magnetic induction B 50 ⁇ 1.76T, the iron loss P 15/50 ⁇ 7.00W/kg;
- the magnetic property B 50 ⁇ 1.70T and the iron loss P 15/50 ⁇ 4.00 W/kg are corresponding to the D grade steel grade.
- the innovation of the invention is that a more reasonable chemical composition matching is realized, thereby significantly suppressing the MnS inclusions which have side effects on the electromagnetic properties of the finished material and the precipitation and growth of C, N compounds of Nb, V, Ti and Al. Specifically elaborated as follows:
- the temperature of the molten steel gradually decreased, and the segregation of Mn and S elements caused the concentration of [Mn][S] in the solidification front to gradually increase, and reached or exceeded the equilibrium concentration, and began to precipitate MnS inclusions. Due to the small size and large number of MnS inclusions, the electromagnetic properties of the finished material have a great influence.
- the prior art can form a large particle of rare earth by adding strong deoxidation and desulfurization elements such as rare earth and calcium, and relying on the binding ability of rare earth, calcium and sulfur to be far greater than the binding ability of Mn and S.
- Calcium sulfide rather than small-sized MnS inclusions, and relies on the buoyancy of molten steel to remove. However, this will greatly increase the manufacturing cost of steelmaking. Large particles of rare earth and calcium inclusions can easily block the nozzle, causing interruption of casting and steel defects.
- FIG. 1 shows the relationship between [Mn]/[S] and the magnetic induction B 50 .
- the magnetic The sense of B 50 is first increased and then decreased rapidly, while when Mn/S is between 120 and 160, the magnetic induction B 50 is optimal.
- the invention controls [Mn]/[S] between 120 and 160 to ensure that the MnS inclusions are precipitated as early as possible in the initial stage of solidification of the molten steel, so that temperature and time conditions can be provided for the sufficient growth of the subsequent MnS inclusions.
- the present invention also strictly limits the temperature of the slab before the slab is placed in the heating furnace, specifically controlling the temperature of the slab into the furnace ⁇ 600 ° C, preferably ⁇ 300 ° C, in order to utilize the lower slab temperature.
- the MnS growth is further promoted during the heating and heating process of the slab.
- the magnetic induction B 50 decreases rapidly as the temperature of the slab enters the furnace increases, and the magnetic induction B 50 overall when the furnace temperature is above 600 °C Keep it at a low level. Therefore, from the viewpoint of actual production control, the slab entering furnace temperature is kept below 600 ° C, or lower, preferably ⁇ 300 ° C.
- the MnS inclusion formed by the Mn and S elements can be controlled by the above method, that is, the influence can be eliminated or reduced.
- Nb, V, Ti, and Al combine with C and N elements to form nano-sized C, N inclusions of Nb, V, Ti, and Al.
- the inclusions are finer in size and mainly precipitate on the grain boundaries. Will seriously weaken the electromagnetic properties of the finished material. Therefore, it is necessary to limit its precipitation as much as possible, that is, it should delay its precipitation time and reduce its precipitation.
- the cooling rate of the slab is increased as much as possible to reduce the residence time in the temperature range.
- the type of precipitates is mainly s precipitates, and the size of the precipitates is large ( ⁇ 0.5 ⁇ m), which has little effect on the magnetic properties of the finished product.
- the excessive cooling rate requires high equipment capacity, generally difficult to reach >20 ° C / min, and after the cooling rate exceeds 20 ° C / min, the low quality of the slab has an adverse effect.
- the type of precipitates is mainly N-form precipitates, and the size of precipitates is generally small ( ⁇ 0.5 ⁇ m), and therefore, the influence on the magnetic properties of the finished product is large.
- the slab temperature cooling rate is too slow, which is not conducive to controlling the precipitation of C, N compounds of Nb, V, Al, Ti, that is, generating more harmful inclusions.
- [Mn]/[S] is between 120 and 160
- [Nb]/93+[V]/51+[Ti]/48+[Al]/27 ⁇ [C]/ 12+[N]/14 is intended to strictly control the S and N compounds that are harmful to magnetic properties.
- the surface temperature of the slab is controlled in the range of 1100-700 °C
- the controlled cooling rate is 2.5-20 ° C / min
- the furnace temperature is controlled to ⁇ 600 ° C when the slab is heated. It is based on the principle of metallurgy, using the "formation mechanism" of the precipitate to optimize, rather than the conventional "control mechanism” optimization.
- the invention optimizes the chemical composition design, obtains the appropriate Mn/S ratio by adjusting the manganese and sulfur content, and after the smelting is finished, the Nb, V, Ti, Al content is controlled and meets the design requirements, and the surface temperature of the slab is controlled in the casting process.
- the cooling rate of the cooling process from 1100 to 700 °C, after the completion of the molten steel casting, the temperature of the slab is adjusted by the temperature control method, and the non-oriented silicon steel sheet produced has high magnetic induction and low iron loss, effectively achieving high efficiency. Stable production of non-oriented silicon steel sheets with magnetic induction and low iron loss.
- the manufacturing process of the invention does not need to undergo normalization treatment or intermediate annealing treatment of the cover furnace, and has the characteristics of low cost, simple operation, easy realization, small production difficulty, and the like, and the manufacturing process is stable, and the manufactured silicon steel sheet has excellent electromagnetic performance.
- Figure 1 is a graph showing the relationship between [Mn] / [S] and magnetic induction B 50 of the present invention.
- Figure 2 is a graph showing the relationship between the temperature of the slab entering the furnace and the magnetic induction B 50 of the present invention.
- Fig. 3 is a graph showing the type and size of precipitates when the cooling rate of the slab surface temperature from 1100 ° C to 700 ° C is 2.5 ° C / min.
- Fig. 4 is a graph showing the type and size of precipitates when the cooling rate of the slab surface temperature of the slab is lowered from 1100 ° C to 700 ° C during a cooling rate of 25 ° C / min.
- Table 1 is a composition of a silicon steel sheet and a comparative silicon steel sheet according to an embodiment of the present invention
- Table 2 is an example of the present invention, a comparative process design, and electromagnetic properties.
- the molten iron and scrap steel are matched according to the chemical composition ratio in Table 1. After smelting in a 300-ton converter, decarburization, deoxidation and alloying are carried out by RH refining; the Mn content is dynamically adjusted according to the S content in the steel to obtain the optimum ratio [Mn ]/[S], control the C, N, Nb, V, Ti, Al content to meet the design requirements; after the molten steel is cast by continuous casting, a slab of 170 mm to 250 mm thick and 800 mm to 1400 mm wide is obtained; after the casting is finished, casting The cooling rate during the cooling process of the surface temperature of the blank from 1100 ° C to 700 ° C is controlled at 2.5 to 20 ° C / min; then, the temperature of the slab into the furnace is adjusted by temperature control method ⁇ 600 ° C, preferably ⁇ 300 ° C; The slab is sequentially subjected to hot rolling, pickling, cold rolling, annealing, and coating to obtain a final product.
- the Si content is in the range of 0.1 to 1.6%, and the steel can be divided into four types according to different Si contents, respectively, the Si content is between 0.11 and 0.30%, and the Si content is between 0.30 and 0.80% (excluding 0.30%). ), the Si content is between 0.80 and 1.20% (excluding 0.80%), and the Si content is between 1.20 and 1.60% (excluding 1.20%), which are sequentially labeled as A, B, C, and D.
- the electromagnetic properties of different Si content series corresponding to the same grade steel belong to the same category.
- the electromagnetic properties of the A grade steel can satisfy the magnetic induction B 50 ⁇ 1.76T, the iron loss P 15/50 ⁇ 6.50 W/kg; the B grade steel (Examples 4-6) The electromagnetic properties can satisfy the magnetic induction B 50 ⁇ 1.75T and the iron loss P 15/50 ⁇ 5.40W/kg; the electromagnetic properties of the C grade steel (Examples 7-9) can satisfy the magnetic induction B 50 ⁇ 1.72T, Iron loss P 15/50 ⁇ 4.00W/kg; D grade steel (Example 10-11) can meet the control requirements of magnetic induction B 50 ⁇ 1.70T and iron loss P 15/50 ⁇ 3.80W/kg .
- the non-oriented silicon steel sheet of the present invention has a higher magnetic sensation and a lower iron loss.
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Abstract
Description
Claims (6)
- 一种高磁感、低铁损无取向硅钢片,其化学成分质量百分比为:C≤0.005%,Si:0.1~1.6%,Mn:0.1~0.5%,P≤0.2%,S≤0.004%,Al≤0.003%、N≤0.005%,Nb≤0.004%,V≤0.004%,Ti≤0.003%,其余为Fe和不可避免的杂质,且上述元素同时需满足如下关系:120≤[Mn]/[S]≤160,[Nb]/93+[V]/51+[Ti]/48+[Al]/27≤[C]/12+[N]/14。
- 根据权利要求1所述的高磁感、低铁损无取向硅钢片,其特征在于,所述化学成分中120≤[Mn]/[S]≤140。
- 根据权利要求1或2所述的高磁感、低铁损无取向硅钢片,其特征在于,所述无取向硅钢片具有如下电磁性能:Si含量为0.1%≤Si≤0.30%时,磁感B50≥1.76T、铁损P15/50≤7.00W/kg;Si含量为0.3%<Si≤0.80%时,磁感B50≥1.75T、铁损P15/50≤6.00W/kg;Si含量为0.8%<Si≤1.20%时,磁感B50≥1.72T、铁损P15/50≤4.00W/kg;Si含量为1.2%<Si≤1.60%时,磁感B50≥1.70T、铁损P15/50≤4.00W/kg。
- 根据权利要求1-3任一项所述的高磁感、低铁损无取向硅钢片的制造方法,其包括如下步骤:1)冶炼、铸造按照权利要求1或2所述化学成分进行冶炼、精炼、连续浇铸成铸坯,连续浇铸工序中,在铸坯表面温度从1100℃降至700℃的降温过程中控制冷却速率为2.5~20℃/min;2)加热铸坯进加热炉加热,控制铸坯入炉温度≤600℃;3)依次经过热轧、酸洗、冷轧、成品退火、涂层后得到成品无取向硅钢片。
- 根据权利要求4所述的高磁感、低铁损无取向硅钢片的制造方法,其特征在于,步骤2)中,所述铸坯入炉温度≤300℃。
- 根据权利要求4或5所述的高磁感、低铁损无取向硅钢片的制造方法,其特征在于,制备得到的所述无取向硅钢片具有如下电磁性能:Si含量为0.1%≤Si≤0.30%时,磁感B50≥1.76T、铁损P15/50≤7.00W/kg;Si含量为0.3%<Si≤0.80%时,磁感B50≥1.75T、铁损P15/50≤6.00W/kg;Si含量为0.8%<Si≤1.20%时,磁感B50≥1.72T、铁损P15/50≤4.00W/kg;Si含量为1.2%<Si≤1.60%时,磁感B50≥1.70T、铁损P15/50≤4.00W/kg。
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US16/304,377 US20190136336A1 (en) | 2016-05-30 | 2017-05-22 | High-magnetic-induction low-iron-loss non-oriented silicon steel sheet and manufacturing method therfor |
KR1020187033432A KR102240395B1 (ko) | 2016-05-30 | 2017-05-22 | 고-자기-유도 저-철-손실 무방향성 실리콘 강판 및 이의 제조 방법 |
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RU2746618C1 (ru) * | 2018-01-31 | 2021-04-19 | Баошань Айрон Энд Стил Ко., Лтд. | Способ получения стойкой при отжиге для снятия напряжений, текстурированной кремнистой стали с низкими потерями в железе |
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CN115198199A (zh) * | 2022-09-14 | 2022-10-18 | 张家港扬子江冷轧板有限公司 | 高强度无取向硅钢生产方法、高强度无取向硅钢及应用 |
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KR102240395B1 (ko) | 2021-04-13 |
US20190136336A1 (en) | 2019-05-09 |
RU2709544C1 (ru) | 2019-12-18 |
KR20180135949A (ko) | 2018-12-21 |
CN105925884B (zh) | 2018-03-09 |
JP6765448B2 (ja) | 2020-10-07 |
CN105925884A (zh) | 2016-09-07 |
JP2019521246A (ja) | 2019-07-25 |
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