CN113755750A - A kind of production method of phosphorus-containing high magnetic induction non-oriented silicon steel - Google Patents
A kind of production method of phosphorus-containing high magnetic induction non-oriented silicon steel Download PDFInfo
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000011574 phosphorus Substances 0.000 title claims abstract description 19
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 17
- 230000006698 induction Effects 0.000 title abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000000137 annealing Methods 0.000 claims abstract description 26
- 238000005097 cold rolling Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 19
- 238000002791 soaking Methods 0.000 claims abstract description 18
- 238000003723 Smelting Methods 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000009749 continuous casting Methods 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 5
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000007670 refining Methods 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 10
- 229910052717 sulfur Inorganic materials 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 abstract description 21
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010899 nucleation Methods 0.000 abstract description 3
- 230000006911 nucleation Effects 0.000 abstract description 3
- 239000010703 silicon Substances 0.000 abstract description 3
- 229910000838 Al alloy Inorganic materials 0.000 abstract description 2
- 229910000914 Mn alloy Inorganic materials 0.000 abstract description 2
- 229910000676 Si alloy Inorganic materials 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 238000005554 pickling Methods 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000010310 metallurgical process Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
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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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- 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
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- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- 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
- C21D8/1216—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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- 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
- C21D8/1216—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
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- 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
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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Abstract
本发明涉及一种含磷高磁感无取向硅钢的生产方法，工艺路线：铁水脱硫－转炉冶炼－RH精炼－连铸－热轧－酸洗－冷轧－连续炉退火－涂层－性能检验－包装，具体步骤包括：1)将钢水冶炼至目标成分后采用连铸方式将钢水铸成坯；2)热轧板坯加热炉均热段板坯温度950～1050℃，终轧温度控制在780～830℃，卷取温度600～680℃；3)酸洗后冷轧，控制冷轧整体压下率80％以上，至成品厚度，增加剪切带组织；4)连续退火炉快速加热段温度设定1000～1150℃，增加有利织构组织形核；均热段温度设定750～830℃，全氮气干气氛保护，退火工艺速度110～150m/min，满足晶粒度8～4级。本发明在减少硅、铝、锰合金添加量的情况下，改善铁损提高磁感性能，提高机械性能。The invention relates to a method for producing phosphorus-containing non-oriented silicon steel with high magnetic induction. - Packaging, the specific steps include: 1) After smelting molten steel to the target composition, the molten steel is cast into billets by continuous casting; 2) The temperature of the slab in the soaking section of the hot-rolled slab heating furnace is 950-1050 °C, and the final rolling temperature is controlled at 780～830℃, coiling temperature 600～680℃; 3) Cold rolling after pickling, control the overall reduction rate of cold rolling to more than 80%, to the thickness of the finished product, and increase the shear band structure; 4) Rapid heating section of continuous annealing furnace The temperature is set at 1000-1150°C to increase the nucleation of the favorable texture structure; the temperature in the soaking section is set at 750-830°C, protected by an all-nitrogen dry atmosphere, and the annealing process speed is 110-150m/min, which meets the grain size of 8-4 grades . The invention improves the iron loss, improves the magnetic induction performance and improves the mechanical performance under the condition of reducing the addition amount of silicon, aluminum and manganese alloys.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel.
Background
The non-oriented silicon steel is an important metal functional soft magnetic material and is widely applied to the manufacturing field of electromagnetic iron cores required by electromagnetic conversion of motors and the like. At present, the electromagnetic performance and comprehensive quality level of domestic related products reach the advanced level in the world, the product competition is intensified day by day, and the non-oriented electrical steel variety with high efficiency, low cost, short flow, high performance and competitiveness becomes the consensus of each mainstream production enterprise.
With the progress of modern metallurgical technology, the traditional component design of non-oriented silicon steel varieties is continuously improved by combining different process equipment and capability levels of enterprises. On the basis that the steel cleanliness level is greatly improved, the traditional product metallurgical chemical composition design can be converted into multi-element main alloy design or micro-alloy design, the metallurgical and process cost is reduced, meanwhile, better electromagnetic performance and processing performance are obtained, and the method becomes the direction of product research and development and variety optimization. In the production of non-oriented silicon steel, phosphorus has the same effect as alloy elements such as silicon, aluminum and the like in the aspect of increasing the resistivity, has higher significance in a certain range, is better in the aspect of improving the punching performance of products, and can greatly reduce the alloy cost in corresponding design. However, under different component designs and process conditions, the advantages of phosphorus are difficult to be exerted, and particularly, the processing defects of phosphorus-containing steel in the metallurgical process, the brittle fracture of teeth and yokes and the like caused by annealing after punching by users and the like are greatly restricted in the production of the traditional metallurgical process.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel, which improves iron loss and magnetic induction performance or mechanical performance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing non-oriented silicon steel with phosphorus-containing high magnetic induction comprises the following chemical components: 0.0035 to 0.0080 percent; si: 0.15% -1.70%, Als: 0.10-0.5%, Mn: 0.10 to 0.60 percent of Fe, 0.050 to 0.25 percent of P, less than or equal to 0.0050 percent of S, less than or equal to 0.0020 percent of N, 0.020 to 0.055 percent of Cu or the condition that Cu percent is (10S percent +0.2P percent), less than or equal to 0.0050 percent of Ti + V + Nb, and the balance of Fe and inevitable residual elements; the process route is as follows: the method comprises the following steps of molten iron desulphurization, converter smelting, RH refining, continuous casting, hot rolling, acid cleaning, cold rolling, continuous furnace annealing, coating, performance inspection and packaging, and specifically comprises the following steps:
1) smelting the molten steel to a target component, and then casting the molten steel into a blank in a continuous casting mode;
2) the slab temperature of a soaking section of a hot-rolled slab heating furnace is 950-1050 ℃, the finishing temperature is controlled to be 780-830 ℃, and the coiling temperature is 600-680 ℃;
3) cold rolling is carried out after acid washing, the integral reduction rate of the cold rolling is controlled to be more than 80 percent until the thickness of a finished product is reached, and the structure of a shear band is increased;
4) setting the temperature of a rapid heating section of the continuous annealing furnace to be 1000-1150 ℃, and increasing texture tissue nucleation; the temperature of the soaking section is set to be 750-830 ℃, the protection is carried out in the dry atmosphere of full nitrogen, the speed of the annealing process is 110-150 m/min, and the grain size is 8-4 grade.
The components have the following functions:
c: proper amount of carbon inhibits the phosphorus segregation of matrix structure, improves the hot rolling and cold rolling processability, promotes the energy storage of texture components, and shortens the refining decarburization time;
s: refining desulfurization is avoided, refining treatment time is shortened, and coarsening of a sulfide is promoted;
cu: the precipitation and coarsening of sulfides are promoted, the hot rolling and cold rolling processability is improved, and the energy storage of unfavorable texture components is reduced;
ti + V + Nb: the clean steel is controlled to play the role of the designed elements of phosphorus and copper.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention improves the iron loss, improves the magnetic induction performance and improves the mechanical performance under the condition of reducing the addition of silicon, aluminum and manganese alloy.
2. In the traditional silicon steel cleanliness control technology, non-ultra-low carbon and ultra-low sulfur control reduces the refining difficulty, shortens the refining time and reduces the process cost.
3. The requirements of hydrogen and nitrogen protective gas and the wet atmosphere decarburization in the traditional heat treatment process are changed, and the process cost is reduced; and the control of a relatively fine grain structure improves the operating efficiency of the unit.
4. The phosphorus and copper element is focused in the grain boundary, so that the residual carbon precipitation is reduced, the grain boundary is partially polymerized with phosphorus element to promote the grain boundary carbon to escape, and the magnetic aging requirement of the product is met.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
A production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel comprises the following chemical components: 0.0035 to 0.0080 percent; si: 0.15% -1.70%, Als: 0.10-0.5%, Mn: 0.10 to 0.60 percent of Fe, 0.050 to 0.25 percent of P, less than or equal to 0.0050 percent of S, less than or equal to 0.0020 percent of N, 0.020 to 0.055 percent of Cu or the condition that Cu percent is (10S percent +0.2P percent), less than or equal to 0.0050 percent of Ti + V + Nb, and the balance of Fe and inevitable residual elements; the process route is as follows: the method comprises the following steps of molten iron desulphurization, converter smelting, RH refining, continuous casting, hot rolling, acid cleaning, cold rolling, continuous furnace annealing, coating, performance inspection and packaging, and specifically comprises the following steps:
1) smelting the molten steel to a target component, and then casting the molten steel into a blank in a continuous casting mode;
2) the slab temperature of a soaking section of a hot-rolled slab heating furnace is 950-1050 ℃, the finish rolling temperature is controlled to be 780-830 ℃, the coiling temperature is 600-680 ℃, the deformation structure is controlled, and the high finish rolling temperature is beneficial to improving the recrystallization structure of the hot-rolled slab;
3) cold rolling is carried out after acid washing, the integral reduction rate of the cold rolling is controlled to be more than 80 percent, until the thickness of a finished product is reached, the structure of a shear band is increased, the deformation structure can be increased under the large reduction of the cold rolling, namely the structure of the shear band, and the silicon steel is favorable for the formation of texture components in the shear band in priority;
4) setting the temperature of a rapid heating section of the continuous annealing furnace to be 1000-1150 ℃, and increasing texture tissue nucleation; the temperature of the soaking section is set to be 750-830 ℃, the protection is carried out in the dry atmosphere of full nitrogen, the speed of the annealing process is 110-150 m/min, and the grain size is 8-4 grade.
Example 1:
a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel comprises the following chemical components in percentage by mass: c: 0.005%, Si: 0.60%, Mn: 0.25%, P: 0.11%, S: 0.0045%, Als: 0.20%, N: 0.0015%, Cu 0.045%, Ti + V + Nb: 0.0050% and the balance of iron and inevitable impurity elements. The production method comprises the following process steps:
a) smelting and continuous casting: smelting in a converter, carrying out RH vacuum refining treatment, controlling the components of molten steel according to the requirements, and casting into a plate blank with the thickness of 230 mm;
b) the soaking temperature of the hot-rolled plate blank is 1030 ℃, and the hot-rolled plate blank enters a finishing mill group for rolling after being initially rolled to 40 mm. The start rolling temperature of finish rolling is 980 ℃, the finish rolling temperature is 810 ℃, the coiling temperature is 660 ℃, and the thickness of a hot rolled plate is 3.0 mm;
c) cold rolling to 0.50mm after acid cleaning;
d) the temperature of a continuous annealing rapid heating section after cold rolling is 1060 ℃, the temperature of a soaking section is 790 ℃, the temperature is protected by total nitrogen, the process speed is 140m/min, the continuous annealing is carried out, and the grade of the grain structure is 6.5.
The product is suitable for annealing after punching by users, is used for motor stator and rotor, keeps the temperature at 750 ℃ for 2 hours, has the iron loss improvement rate of more than 15 percent, reduces the magnetic induction by 0.01T, and keeps the stator and rotor teeth from being broken.
Example 2:
a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel comprises the following chemical components in percentage by mass: c: 0.0052%, Si: 0.58%, Mn: 0.36%, P: 0.15%, S: 0.0040%, Als: 0.25%, N: 0.0018%, Cu 0.070%, Ti + V + Nb: 0.0050% and the balance of iron and inevitable impurity elements. The production method comprises the following process steps:
a) smelting and continuous casting: smelting in a converter, carrying out RH vacuum refining treatment, controlling the components of molten steel according to the requirements, and casting into a plate blank with the thickness of 230 mm;
b) the soaking temperature of the hot-rolled plate blank is 1020 ℃, the hot-rolled plate blank enters a finishing mill group for rolling after being initially rolled to 40 mm. The finish rolling start temperature is 990 ℃, the finish rolling temperature is 820 ℃, the coiling temperature is 670 ℃ and the thickness of the hot rolled plate is 3.0 mm;
c) cold rolling to 0.50mm after acid cleaning;
d) after cold rolling, the temperature of a continuous annealing rapid heating section is 1050 ℃, the temperature of a soaking section is 800 ℃, the temperature is protected by total nitrogen, the process speed is 145m/min, the continuous annealing is carried out, and the grade of the grain structure is 6.0.
The product is suitable for annealing after punching by users, is used for motor stator and rotor, keeps the temperature at 750 ℃ for 2 hours, has the iron loss improvement rate of more than 15 percent, reduces the magnetic induction by 0.01T, and keeps the stator and rotor teeth from being broken.
Example 3:
a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel comprises the following chemical components in percentage by mass: c: 0.006%, Si: 0.25%, Mn: 0.30%, P: 0.18%, S: 0.0040%, Als: 0.15%, N: 0.0018%, Cu 0.035%, Ti + V + Nb: 0.0045% balance iron and inevitable impurity elements. The production method comprises the following process steps:
a) smelting and continuous casting: smelting in a converter, carrying out RH vacuum refining treatment, controlling the components of molten steel according to the requirements, and casting into a plate blank with the thickness of 230 mm;
b) the soaking temperature of the hot-rolled plate blank is 1000 ℃, and the hot-rolled plate blank enters a finishing mill group for rolling after being initially rolled to 40 mm. The finish rolling temperature is 960 ℃, the finish rolling temperature is 780 ℃, the coiling temperature is 680 ℃, and the thickness of the hot rolled plate is 3.2 mm;
c) cold rolling to 0.50mm after acid cleaning;
d) after cold rolling, the temperature of a continuous annealing rapid heating section is 1080 ℃, the temperature of a soaking section is 800 ℃, the temperature is protected by total nitrogen, the process speed is 150m/min, the continuous annealing is carried out, and the grade of the grain structure is 6.0.
Example 4:
a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel comprises the following chemical components in percentage by mass: c: 0.006%, Si: 0.30%, Mn: 0.31%, P: 0.20%, S: 0.0028%, Als: 0.14%, N: 0.0017%, Cu 0.068%, Ti + V + Nb: 0.0045 percent, and the balance of iron and inevitable impurity elements. The production method comprises the following process steps:
a) smelting and continuous casting: smelting in a converter, carrying out RH vacuum refining treatment, controlling the components of molten steel according to the requirements, and casting into a plate blank with the thickness of 230 mm;
b) the soaking temperature of the hot-rolled plate blank is 1010 ℃, the hot-rolled plate blank enters a finishing mill group for rolling after being initially rolled to 40 mm. The start rolling temperature of finish rolling is 970 ℃, the finish rolling temperature is 790 ℃, the coiling temperature is 690 ℃, and the thickness of the hot rolled plate is 3.2 mm;
c) cold rolling to 0.50mm after acid cleaning;
d) the temperature of a continuous annealing rapid heating section after cold rolling is 1070 ℃, the temperature of a soaking section is 810 ℃, the total nitrogen protection is carried out, the process speed is 150m/min, the continuous annealing is carried out, and the grade of the grain structure is 6.0.
Comparative example 1
The steel grade comprises the following chemical components in percentage by mass: c: 0.025%, Si: 0.75%, Mn: 030%, P: 0.012%, S: 0.004%, Als: 0.30%, N: 0.0015 percent, and the balance of iron and inevitable impurity elements.
Smelting in a converter, carrying out RH vacuum refining treatment, controlling the components of molten steel according to the requirements, and casting into a plate blank with the thickness of 230 mm; the soaking temperature of the hot-rolled plate blank is 1130 ℃, the hot-rolled plate blank is rolled in a finishing mill set after being initially rolled to 40mm, the finishing rolling starting temperature is 1020 ℃, the finishing rolling temperature is 860 ℃, the coiling temperature is 700 ℃, and the thickness of the hot-rolled plate is 2.3 mm; cold rolling is directly carried out on the steel strip with the thickness of 0.5mm, the annealing temperature of the finished product is 1050 ℃ and 900 ℃, hydrogen and nitrogen protection is carried out, the process speed is 130m/min, continuous annealing is carried out, and the grade of the grain structure is 5.5.
Comparative example 2
The steel grade comprises the following chemical components in percentage by mass: c: 0.025%, Si: 0.35%, Mn: 0.28%, P: 0.020%, S: 0.0045%, Als: 0.30%, N: 0.0018 percent, and the balance of iron and inevitable impurity elements.
Smelting in a converter, carrying out RH vacuum refining treatment, controlling the components of molten steel according to the requirements, and casting into a plate blank with the thickness of 230 mm; the soaking temperature of the hot-rolled plate blank is 1130 ℃, the hot-rolled plate blank is rolled in a finishing mill set after being initially rolled to 40mm, the finishing rolling starting temperature is 1020 ℃, the finishing rolling temperature is 860 ℃, the coiling temperature is 700 ℃, and the thickness of the hot-rolled plate is 2.5 mm; cold rolling is directly carried out on the steel strip with the thickness of 0.5mm, the annealing temperature of the finished product is 1050 ℃ and 880 ℃, hydrogen and nitrogen protection is carried out, the process speed is 130m/min, continuous annealing is carried out, and the grade of the grain structure is 6.0.
The properties of the examples and comparative examples are shown in tables 1 and 2 below;
table 1:
table 2:
Claims (1)
1. a production method of phosphorus-containing high-magnetic-induction non-oriented silicon steel is characterized in that the chemical composition C in the steel is as follows: 0.0035 to 0.0080 percent; si: 0.15% -1.70%, Als: 0.10-0.5%, Mn: 0.10 to 0.60 percent of Fe, 0.050 to 0.25 percent of P, less than or equal to 0.0050 percent of S, less than or equal to 0.0020 percent of N, 0.020 to 0.055 percent of Cu or the condition that Cu is 10S% + 0.2P%, less than or equal to 0.0050 percent of Ti + V + Nb, and the balance of Fe and inevitable residual elements; the process route is as follows: the method comprises the following steps of molten iron desulphurization, converter smelting, RH refining, continuous casting, hot rolling, acid cleaning, cold rolling, continuous furnace annealing, coating, performance inspection and packaging, and specifically comprises the following steps:
1) smelting the molten steel to a target component, and then casting the molten steel into a blank in a continuous casting mode;
2) the slab temperature of a soaking section of a hot-rolled slab heating furnace is 950-1050 ℃, the finishing temperature is controlled to be 780-830 ℃, and the coiling temperature is 600-680 ℃;
3) cold rolling is carried out after acid washing, the integral reduction rate of the cold rolling is controlled to be more than 80 percent until the thickness of a finished product is reached, and the structure of a shear band is increased;
4) setting the temperature of a rapid heating section of the continuous annealing furnace to be 1000-1150 ℃; the temperature of the soaking section is set to be 750-830 ℃, the protection is carried out in the dry atmosphere of full nitrogen, the speed of the annealing process is 110-150 m/min, and the grain size is 8-4 grade.
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