CN116479308A - High surface quality control method of non-oriented electrical steel strip - Google Patents
High surface quality control method of non-oriented electrical steel strip Download PDFInfo
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 17
- 238000003908 quality control method Methods 0.000 title claims abstract 3
- 238000005096 rolling process Methods 0.000 claims abstract description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 19
- 239000000498 cooling water Substances 0.000 claims description 16
- 239000007921 spray Substances 0.000 claims description 8
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 1
- 238000004049 embossing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 230000007547 defect Effects 0.000 abstract description 3
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- 238000003754 machining Methods 0.000 abstract description 2
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002372 labelling Methods 0.000 description 2
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- 230000009467 reduction Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C22C38/04—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
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
Description
技术领域technical field
本发明属于冶金领域，涉及一种无取向电工用钢带高表面质量控制方法。The invention belongs to the field of metallurgy and relates to a method for controlling the high surface quality of a non-oriented electrical steel strip.
背景技术Background technique
电工钢是我国国民经济建设和人民生活不可缺少的重要原材料之一。随着电工钢产业生产技术及产品质量的不断进步，电工钢在增强国家实力和提高人民生活质量方面越来越发挥着重要的作用。Electrical steel is one of the important raw materials that are indispensable to my country's national economic construction and people's lives. With the continuous improvement of production technology and product quality in the electrical steel industry, electrical steel plays an increasingly important role in enhancing national strength and improving people's quality of life.
电工钢，也叫硅钢，分取向电工钢和无取向电工钢两种。取向电工钢主要用于制造变压器、互感器的铁芯，无取向电工钢主要用于制造电机的铁芯，电工钢品质的提升直接关系到变压器和电机的运行质量，对国家的能源高效利用、低碳环保起着举足轻重的作用。Electrical steel, also called silicon steel, is divided into two types: oriented electrical steel and non-oriented electrical steel. Oriented electrical steel is mainly used to manufacture iron cores of transformers and transformers, and non-oriented electrical steel is mainly used to manufacture iron cores of motors. The improvement of the quality of electrical steel is directly related to the operation quality of transformers and motors, and plays a pivotal role in the efficient use of energy and low-carbon environmental protection in the country.
据电工钢分会统计，未来几年我国电工钢表观消费量为844.90万吨，其中无取向电工钢为724.26万吨，取向电工钢为120.65万吨。按下游行业实际消耗量统计,当年实际消耗电工钢约709.18万吨(不完全),其中取向电工钢约115.78万吨(不含二次油片)、无取向电工钢约593.9万吨，均能满足国内需求，无取向占据大部分市场。国家电网将加快城网和农网的改造升级，这为电机市场需求量增加提供了强劲的动力，我国电机产业规模还将持续增大，电工钢需求在今年的水平上有所上升，预测增幅5％-10％。随着我国电力基础设施的完善与强大，需求将进一步增加，中低牌号电工钢具有较低的生产和使用成本，性价比高。因产品成型加工性能优良，集装箱钢在远洋运输中具有较好的前景。According to statistics from the Electrical Steel Branch, the apparent consumption of electrical steel in my country in the next few years will be 8.449 million tons, of which 7.2426 million tons are non-oriented electrical steel and 1.2065 million tons are oriented electrical steel. According to the actual consumption statistics of downstream industries, the actual consumption of electrical steel in that year was about 7.0918 million tons (incomplete), of which about 1.1578 million tons of oriented electrical steel (excluding secondary oil flakes) and about 5.939 million tons of non-oriented electrical steel, both of which can meet domestic demand, and non-oriented electrical steel occupies most of the market. State Grid will speed up the transformation and upgrading of urban and rural power grids, which provides a strong impetus for the increase in the demand for motors. The scale of my country's motor industry will continue to increase. The demand for electrical steel will increase at this year's level, with a forecast increase of 5%-10%. With the improvement and strengthening of my country's electric power infrastructure, the demand will further increase, and the low- and medium-grade electrical steel has low production and use costs and high cost performance. Due to the excellent forming and processing performance of the product, container steel has a good prospect in ocean transportation.
发明内容Contents of the invention
有鉴于此，本发明的目的在于提供一种无取向电工用钢带高表面质量控制方法，以生产具有高表面质量、成型性好，磁性能高等多项优点的产品。In view of this, the object of the present invention is to provide a method for controlling the high surface quality of non-oriented electrical steel strips, so as to produce products with many advantages such as high surface quality, good formability, and high magnetic properties.
为达到上述目的，本发明提供如下技术方案：To achieve the above object, the present invention provides the following technical solutions:
一种无取向电工用钢带高表面质量控制方法，包括以下步骤：A method for controlling the high surface quality of a non-oriented electrical steel strip, comprising the following steps:
高炉铁水经铁水预处理、转炉冶炼、炉外精炼、板坯连铸、板坯加热、高压除磷、粗轧轧制、精轧轧制、层流冷却、卷取机卷取、后处理的工艺步骤生产无取向电工用钢带。The blast furnace molten iron is produced through the process steps of molten iron pretreatment, converter smelting, external refining, slab continuous casting, slab heating, high-pressure dephosphorization, rough rolling, finish rolling, laminar cooling, coiler coiling, and post-treatment to produce non-oriented electrical steel strip.
可选的，无取向电工用钢带的化学成分以重量组分计包括：C：≤0.006％，Si：0.6％～0.9％％，Mn：0.25％～0.35％，ALs：0.09％～0.15％，N：≤0.005％，其余为Fe以及不可避免的杂质。Optionally, the chemical composition of the non-oriented electrical steel strip includes: C: ≤0.006%, Si: 0.6%-0.9%, Mn: 0.25%-0.35%, ALs: 0.09%-0.15%, N: ≤0.005%, and the rest is Fe and unavoidable impurities.
可选的，板坯加热过程的加热温度为1120～1170℃，在加热炉总时间≥160min，精轧入口温度900℃～1020℃，终轧温度840℃-880℃，卷取温度在570～640℃之间，层冷模式为前段冷却，水冷速度≤10℃/s。Optionally, the heating temperature of the slab heating process is 1120-1170°C, the total time in the heating furnace is ≥160min, the finish rolling inlet temperature is 900°C-1020°C, the finish rolling temperature is 840°C-880°C, the coiling temperature is between 570-640°C, the layer cooling mode is front cooling, and the water cooling speed is ≤10°C/s.
可选的，板坯加热过程中预热段温度900℃-1000℃，加热段温度1150℃-1190℃，均热段1140℃-1170℃，加热段和均热段加热累计时间≥80min，加热炉总时间160-200min，板坯装炉温度≥500℃，板坯出炉温度设计为1140-1170℃。Optionally, during the slab heating process, the temperature of the preheating section is 900°C-1000°C, the temperature of the heating section is 1150°C-1190°C, the temperature of the soaking section is 1140°C-1170°C, the cumulative heating time of the heating section and the soaking section is ≥80 minutes, the total time of the heating furnace is 160-200 minutes, the slab charging temperature is ≥500°C, and the slab discharge temperature is designed to be 1140-1170°C.
可选的，高压除磷步骤中，粗除鳞箱开启2组，保证喷水压力20～22.5MPa，粗轧机除鳞2、4道次开启，保证喷水压力20～22MPa，粗除鳞和粗轧机除鳞水不能同时使用，精轧除鳞箱2组，喷水压力18～20MPa。Optionally, in the high-pressure dephosphorization step, 2 sets of rough descaling boxes are opened to ensure the water spray pressure of 20-22.5MPa, the 2nd and 4th passes of rough rolling mill descaling are opened to ensure the water spray pressure of 20-22MPa, rough descaling and rough rolling mill descaling water cannot be used at the same time, 2 sets of finish rolling descaling boxes, water spray pressure of 18-20MPa.
可选的，粗轧轧制过程中粗轧机冷却水的要求如下：立辊冷却水流量阀开口度调整为30％；水流量400m3/h；关闭除鳞预冲水阀；关闭粗轧立辊冲渣水；增加立辊冷却水水切水装置，粗轧花架辊和工作轧辊冷却水流量降低20％。Optionally, the requirements for the cooling water of the roughing mill during the rough rolling process are as follows: the opening degree of the vertical roll cooling water flow valve is adjusted to 30%; the water flow rate is 400m 3 /h; the pre-flushing water valve for descaling is closed;
可选的，精轧轧制过程中精轧机架间冷却水全部关闭。Optionally, the cooling water between the finishing stands is completely closed during the finishing rolling process.
可选的，粗轧轧制过程中粗轧立辊侧压量减宽范围15-25mm，同时降低1道侧压负荷30％，3道和5道侧压负荷增加20％，Optionally, during the rough rolling process, the side pressure of the vertical roll in the rough rolling can be reduced by 15-25mm, and the side pressure load of the 1st pass can be reduced by 30%, and the side pressure load of the 3rd and 5th passes can be increased by 20%.
可选的，精轧轧制过程中，精轧穿带速度具体为：F1 1.6mps，F2 2.9mps，F34.6mps，F4 5.9mps，F5 6.5mps，F6 7.8mps，F7 8.7mps。Optionally, during the finish rolling process, the finish rolling strip threading speed is specifically: F1 1.6mps, F2 2.9mps, F3 4.6mps, F4 5.9mps, F5 6.5mps, F6 7.8mps, F7 8.7mps.
可选的，卷取机卷取过程中，卷取侧导板的压力补偿为-10KN。Optionally, during the coiling process of the coiler, the pressure compensation of the guide plate on the coiling side is -10KN.
本发明的有益效果在于：The beneficial effects of the present invention are:
本发明的钢种工艺设计合理，无需新增生产装备条件，生产工艺可控,表面无孔洞、边裂缺陷，边部翘皮缺陷，该产品在现有条件下成功开发，具有良好的机械加工能力。该发明生产的高表面质量各项性能全部满足订货标准，同时满足内控要求和用户使用，表面质量好，尤其是产品具备优良性能，综合机械加工性能较好。The steel grade of the invention has reasonable process design, no need for additional production equipment, controllable production process, no holes, edge cracks, and edge warping defects on the surface. The product has been successfully developed under the existing conditions and has good machining ability. The performance of the high surface quality produced by the invention all meets the ordering standards, and at the same time meets the internal control requirements and user use, the surface quality is good, especially the product has excellent performance, and the comprehensive mechanical processing performance is better.
本发明的其他优点、目标和特征在某种程度上将在随后的说明书中进行阐述，并且在某种程度上，基于对下文的考察研究对本领域技术人员而言将是显而易见的，或者可以从本发明的实践中得到教导。本发明的目标和其他优点可以通过下面的说明书来实现和获得。Other advantages, objects and features of the present invention will be set forth in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the investigation and research below, or can be taught from the practice of the present invention. The objects and other advantages of the invention may be realized and attained by the following specification.
具体实施方式Detailed ways
以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。需要说明的是，在不冲突的情况下，以下实施例及实施例中的特征可以相互组合。Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
本发明公开了一种无取向电工用钢带高表面质量控制方法，具体包括以下步骤：高炉铁水→铁水预处理→转炉冶炼→炉外精炼→板坯连铸→板坯加热→高压除鳞→带立辊的粗轧轧制→精轧高压除鳞→精轧7机架连轧→U型管层流冷却→卷取机卷取、打包→钢卷信息面喷、侧喷→表面尺寸及质量检查→编批取样送检→检验合格后贴标签→入库准发。The invention discloses a method for controlling the high surface quality of a non-oriented electrical steel strip, which specifically comprises the following steps: blast furnace molten iron → molten iron pretreatment → converter smelting → external refining → slab continuous casting → slab heating → high-pressure descaling → rough rolling with vertical rolls → finish high-pressure descaling → finish rolling with 7 stands continuous rolling → U-shaped tube laminar flow cooling → coiler coiling and packaging → steel coil information surface spraying, side spraying → surface size and quality inspection → batch sampling and inspection → labeling after passing the inspection → labeling → Inbound delivery.
本发明公开具有无取向电工用钢带高表面质量控制方法,采用超低碳、超低硫、高铝成分设计思路，化学成分的含量如下(按重量百分):C：≤0.006％，Si：0.6％～0.9％％，Mn：0.25％～0.35％，ALs：0.09％～0.15％，N：≤0.005％，其余为Fe以及不可避免的杂质，同时规定加热温度、粗轧机、精轧机及卷取过程参数控制。The invention discloses a method for controlling the high surface quality of non-oriented electrical steel strips. It adopts the design concept of ultra-low carbon, ultra-low sulfur, and high aluminum components. The content of chemical components is as follows (by weight): C: ≤0.006%, Si: 0.6%-0.9%, Mn: 0.25%-0.35%, ALs: 0.09%-0.15%, N: ≤0.005%, and the rest is Fe and unavoidable impurities. Machine, finishing mill and coiling process parameter control.
工艺特点：利用高炉铁水、通过铁水预处理、转炉冶炼、RH真空脱气处理，合适的铸坯拉速，加热温度1120～1170℃，在加热炉总时间≥160min，精轧入口温度900℃～1020℃，终轧温度840℃-880℃,卷取温度在570～640℃之间，层冷模式为前段冷却，水冷速度≤10℃/s。Process features: use of blast furnace molten iron, pretreatment of molten iron, converter smelting, RH vacuum degassing treatment, suitable billet casting speed, heating temperature 1120-1170°C, total time in the heating furnace ≥ 160min, finish rolling entrance temperature 900°C-1020°C, finish rolling temperature 840°C-880°C, coiling temperature between 570-640°C, layer cooling mode is front cooling, water cooling speed ≤ 10°C/s.
加热工艺：根据成分、工艺特点，硅元素扩大奥氏体相区明显，Ar3温度较低，控制加热炉炉气温度，预热段温度900℃-1000℃，加热段温度1150℃-1190℃，均热段1140℃-1170℃，加热段和均热段加热累计时间≥80min，加热炉总时间160-200min，板坯装炉温度≥500℃，板坯出炉温度设计为1140-1170℃。Heating process: According to the composition and process characteristics, the silicon element expands the austenite phase zone significantly, the Ar3 temperature is low, and the temperature of the heating furnace is controlled. The temperature of the preheating section is 900°C-1000°C, the temperature of the heating section is 1150°C-1190°C, and the temperature of the soaking section is 1140°C-1170°C. 1140-1170°C.
轧制工艺：粗轧五道次轧制，不投用热卷箱，精轧七机架连轧，全液压卷取机，为有效控制表面质量，主要对除鳞水及工艺冷却水及参数方面进行优化设计。Rolling process: five-pass rough rolling without hot coil boxes, seven-stand continuous rolling for finish rolling, and fully hydraulic coiler. In order to effectively control the surface quality, the descaling water, process cooling water and parameters are optimized.
①除鳞粗除鳞箱开启2组，保证喷水压力20～22.5MPa，粗轧机除鳞2、4道次开启(除鳞水预冲水流量阀60％)，保证喷水压力20～22MPa，粗除鳞和粗轧机除鳞水不能同时使用，精轧除鳞箱2组，喷水压力18～20MPa。① Open 2 sets of coarse descaling boxes for descaling to ensure water spray pressure of 20-22.5MPa, open the 2nd and 4th passes of descaling in the rough rolling mill (60% of the descaling water pre-flushing water flow valve), and ensure the water spray pressure of 20-22MPa.
②冷却水②Cooling water
粗轧机冷却水：立辊冷却水流量阀开口度调整为30％。水流量约400m3/h；关闭除鳞预冲水阀；关闭粗轧立辊冲渣水；增加立辊冷却水水切水装置，粗轧花架辊和工作轧辊冷却水流量降低20％。Rough mill cooling water: the opening of the vertical roll cooling water flow valve is adjusted to 30%. The water flow is about 400m 3 /h; the descaling pre-flushing water valve is closed; the slag flushing water of the rough rolling vertical roll is closed; the vertical roll cooling water water cutting device is added, and the cooling water flow of the rough rolling stand roll and the work roll is reduced by 20%.
精轧冷却水：因精轧入口温度低，终轧温度较高，精轧机架间冷却水全部关闭。Cooling water for finishing rolling: due to the low temperature at the entrance of finishing rolling and the high temperature of finishing rolling, the cooling water between the finishing rolling stands is all closed.
层流冷却水：设定后向冷却模式，精调段不投用故障阀。Laminar cooling water: Set the backward cooling mode, and the fault valve will not be used in the fine adjustment section.
③轧制参数③Rolling parameters
粗轧立辊侧压量：板坯宽度减宽量不宜太大，减宽范围15-25mm，同时降低1道侧压负荷30％，3道和5道侧压负荷增加20％。Side pressure of rough rolling vertical roll: the width reduction of slab should not be too large, and the width reduction range is 15-25mm. At the same time, the side pressure load of 1st pass is reduced by 30%, and the lateral pressure load of 3rd and 5th passes is increased by 20%.
精轧：精轧除鳞保留1组，轧制速度不宜过快，穿带速度具体为：F1 1.6，F2 2.9，F34.6，F4 5.9，F5 6.5，F6 7.8，F7 8.7[mps]；由于暂无导轮引导，各机架侧导板增加15mm，避免严重擦挂。Finish rolling: 1 group should be reserved for finish rolling and descaling. The rolling speed should not be too fast. The specific strip threading speed is: F1 1.6, F2 2.9, F34.6, F4 5.9, F5 6.5, F6 7.8, F7 8.7 [mps]; since there is no guide wheel for the time being, the side guide plates of each frame should be increased by 15mm to avoid serious scratching.
卷取：卷取侧导板的压力补偿为-10KN，其余钢种该厚度规格未使用过该工艺参数设计。Coiling: The pressure compensation of the guide plate on the coiling side is -10KN, and the thickness specifications of other steel types have not been designed with this process parameter.
附表1为4批钢带熔炼成分实例。Attached Table 1 is an example of the smelting composition of 4 batches of steel strips.
附表2为4批钢带工艺控制情况实例。Attached Table 2 is an example of the process control of 4 batches of steel strips.
最后说明的是，以上实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对本发明的技术方案进行修改或者等同替换，而不脱离本技术方案的宗旨和范围，其均应涵盖在本发明的权利要求范围当中。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions, which should be covered by the scope of the claims of the present invention.
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| WO2022213853A1 (en) * | 2021-04-09 | 2022-10-13 | 宝山钢铁股份有限公司 | Non-oriented electrical steel plate and fabrication method therefor |
| US20230063410A1 (en) * | 2020-02-20 | 2023-03-02 | Nippon Steel Corporation | Hot-rolled steel sheet for non-oriented electrical steel sheet, non-oriented electrical steel sheet, and method for manufacturing same |
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