CN104060167A - Hot-rolled steel sheet and production method thereof - Google Patents
Hot-rolled steel sheet and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 111
- 239000010959 steel Substances 0.000 title claims abstract description 110
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000010936 titanium Substances 0.000 claims abstract description 12
- 239000010955 niobium Substances 0.000 claims abstract description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000011572 manganese Substances 0.000 claims abstract description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 21
- 238000009749 continuous casting Methods 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 239000005864 Sulphur Substances 0.000 claims 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 11
- 229910001562 pearlite Inorganic materials 0.000 abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 6
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
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- 238000012545 processing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
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- 238000003917 TEM image Methods 0.000 description 2
- 229910000870 Weathering steel Inorganic materials 0.000 description 2
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- 229910000734 martensite Inorganic materials 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种热轧钢板及其生产方法。以该热轧钢板的总重量为基准，该热轧钢板的元素组成包括：0.05-0.1重量％的碳、0.3重量％以下的硅、1.6-1.8重量％的锰、0.02重量％以下的磷、0.01重量％以下的硫、0.01-0.03重量％的铌、0.08-0.1重量％的钛和97.64-98.26重量％的铁；该热轧钢板的显微组织为铁素体组织和珠光体组织，具有适应性强的特点。本发明的热轧钢板的屈服强度≥650MPa，可以用于屈服强度650MPa级汽车车厢。另外，本发明的生产方法中采用铌、钛和锰合金化方式，避免了加入Mo、Ni等贵重元素，因此降低了热轧钢板的成本。
The invention discloses a hot-rolled steel plate and a production method thereof. Based on the total weight of the hot-rolled steel sheet, the element composition of the hot-rolled steel sheet includes: 0.05-0.1% by weight of carbon, 0.3% by weight or less of silicon, 1.6-1.8% by weight of manganese, 0.02% by weight or less of phosphorus, 0.01% by weight or less of sulfur, 0.01-0.03% by weight of niobium, 0.08-0.1% by weight of titanium and 97.64-98.26% by weight of iron; the microstructure of the hot-rolled steel plate is ferrite structure and pearlite structure, with Features of strong adaptability. The yield strength of the hot-rolled steel plate of the invention is more than or equal to 650 MPa, and can be used for automobile compartments with a yield strength of 650 MPa. In addition, niobium, titanium and manganese are alloyed in the production method of the present invention, which avoids the addition of precious elements such as Mo and Ni, thereby reducing the cost of hot-rolled steel sheets.
Description
技术领域technical field
本发明涉及一种热轧钢板及其生产方法。The invention relates to a hot-rolled steel plate and a production method thereof.
背景技术Background technique
在现阶段的制造工艺和技术水平下，车身轻量化是解决重载汽车超载荷和节能减排的重要手段。使用高强度钢材，通过减薄钢板厚度和减轻车身的重量，可以在降低自重的前提下提高产品使用寿命。目前，国内载重汽车用车厢板的主要钢材为16Mn和Q345B，高强度车厢板用量较少，与国外同类产品相比车厢板重量高出15-20％。Under the current level of manufacturing technology and technology, body weight reduction is an important means to solve overloading of heavy-duty vehicles and energy saving and emission reduction. Using high-strength steel, by reducing the thickness of the steel plate and reducing the weight of the vehicle body, the service life of the product can be improved on the premise of reducing the self-weight. At present, the main steel materials for the domestic truck body panels are 16Mn and Q345B, and the amount of high-strength body panels is less, and the weight of the box panels is 15-20% higher than that of similar foreign products.
为了降低生产成本和提高构件安全性，高强度汽车车厢用热轧钢板开发以逐渐提上日程，各大钢厂也陆续开展这方面的研究工作。例如，北京科技大学的赵征志等发明了一种汽车厢体用热轧酸洗高强钢的制备方法(CN102787272A)；江苏省沙钢钢铁研究院有限公司的许振刚等发明的高强度低合金热轧铁素体贝氏体耐候钢及其生产方法(CN101660099A)；广州珠江钢铁有限责任公司的毛新平等发明的一种应用薄板坯连铸连轧流程生产Ti微合金化高强耐候钢板的工艺(CN1785543A)，等。In order to reduce production costs and improve component safety, the development of hot-rolled steel plates for high-strength automobile compartments has gradually been put on the agenda, and major steel mills have also carried out research work in this area. For example, Zhao Zhengzhi of Beijing University of Science and Technology invented a method for preparing hot-rolled pickled high-strength steel for automobile body (CN102787272A); Plain bainite weathering steel and its production method (CN101660099A); a process for producing Ti microalloyed high-strength weathering steel using a thin slab continuous casting and rolling process invented by Mao Xinping of Guangzhou Zhujiang Iron and Steel Co., Ltd. (CN1785543A) ,wait.
然而，上述方法中普遍添加了Mo、Cr、Ni等昂贵的合金元素，因此热轧钢板的成本依然较高。且部分产品采用薄板坯连铸连轧工艺，低的终轧温度(如800℃)、低的卷取温度(如320℃)和常规冷却工艺使最终成品组织中引进贝氏体或马氏体强化，而这些成品在加工过程中的显微组织会发生变化，致使产品的使用性能并不理想。However, expensive alloying elements such as Mo, Cr, and Ni are generally added in the above method, so the cost of the hot-rolled steel sheet is still relatively high. And some products adopt thin slab continuous casting and rolling process, low finishing temperature (such as 800 ℃), low coiling temperature (such as 320 ℃) and conventional cooling process to introduce bainite or martensite into the final product structure Strengthening, and the microstructure of these finished products will change during processing, resulting in unsatisfactory performance of the product.
因此，有必要开发一种新的且低成本的热轧钢板及其生产方法。Therefore, it is necessary to develop a new and low-cost hot-rolled steel sheet and its production method.
发明内容Contents of the invention
本发明的目的在于克服现有技术中汽车车厢用热轧钢板成本高、轧制工艺控制复杂和适应性差的缺陷，从而提供一种热轧钢板及其生产方法。The purpose of the present invention is to overcome the defects of high cost, complex rolling process control and poor adaptability of hot-rolled steel plates for automobile compartments in the prior art, thereby providing a hot-rolled steel plate and a production method thereof.
根据本发明的第一个方面，本发明提供了一种热轧钢板，其中，以所述热轧钢板的总重量为基准，所述热轧钢板的元素组成包括：0.05-0.1重量％的碳、0.3重量％以下的硅、1.6-1.8重量％的锰、0.02重量％以下的磷、0.01重量％以下的硫、0.01-0.03重量％的铌、0.08-0.1重量％的钛和97.64-98.26重量％的铁；所述热轧钢板的显微组织为铁素体组织和珠光体组织。According to the first aspect of the present invention, the present invention provides a hot-rolled steel sheet, wherein, based on the total weight of the hot-rolled steel sheet, the element composition of the hot-rolled steel sheet includes: 0.05-0.1% by weight of carbon , 0.3 wt% or less of silicon, 1.6-1.8 wt% of manganese, 0.02 wt% or less of phosphorus, 0.01 wt% or less of sulfur, 0.01-0.03 wt% of niobium, 0.08-0.1 wt% of titanium and 97.64-98.26 wt% % iron; the microstructure of the hot-rolled steel plate is ferrite structure and pearlite structure.
根据本发明的第二个方面，本发明提供了上述热轧钢板的生产方法，该方法包括：将钢水连铸成板坯，将所述板坯依次进行加热、粗轧、精轧、层流冷却和卷取，其中，以所述钢水的总重量为基准，所述钢水的元素组成包括：0.05-0.1重量％的碳、0.3重量％以下的硅、1.6-1.8重量％的锰、0.02重量％以下的磷、0.01重量％以下的硫、0.01-0.03重量％的铌、0.08-0.1重量％的钛和97.64-98.26重量％的铁；所述加热的温度为1240-1280℃，所述精轧的入口温度为950-1050℃，所述精轧的终轧温度为860-920℃，所述卷取的温度为580-640℃。According to the second aspect of the present invention, the present invention provides a production method of the above-mentioned hot-rolled steel plate, the method comprising: continuously casting molten steel into a slab, and sequentially heating the slab, rough rolling, finish rolling, laminar flow Cooling and coiling, wherein, based on the total weight of the molten steel, the elemental composition of the molten steel includes: 0.05-0.1% by weight of carbon, 0.3% by weight or less of silicon, 1.6-1.8% by weight of manganese, 0.02% by weight Phosphorus below 0.01% by weight, sulfur below 0.01% by weight, niobium at 0.01-0.03% by weight, titanium at 0.08-0.1% by weight and iron at 97.64-98.26% by weight; the heating temperature is 1240-1280°C, and the refined The entry temperature of rolling is 950-1050°C, the finish rolling temperature is 860-920°C, and the coiling temperature is 580-640°C.
根据本发明的第三个方面，本发明提供了由上述方法生产的热轧钢板。According to a third aspect of the present invention, the present invention provides a hot-rolled steel sheet produced by the above method.
根据本发明的第四个方面，本发明提供了上述热轧钢板在汽车车厢上的应用。According to the fourth aspect of the present invention, the present invention provides the application of the above-mentioned hot-rolled steel sheet on the vehicle compartment.
本发明的热轧钢板的屈服强度≥650MPa，且显微组织为铁素体和珠光体组织，这可以避免钢板在加工(如焊接)过程中显微组织的变化而导致的钢板强度的降低的缺陷，本发明的热轧钢板可以用于屈服强度650MPa级汽车车厢。另外，本发明的生产方法中采用铌、钛和锰合金化方式，避免了加入Mo、Ni等贵重元素，因此降低了热轧钢板的成本。The yield strength of the hot-rolled steel plate of the present invention is more than or equal to 650MPa, and the microstructure is ferrite and pearlite, which can avoid the reduction of the steel plate strength caused by the change of the microstructure of the steel plate during processing (such as welding). Disadvantage, the hot-rolled steel sheet of the present invention can be used for automobile compartments with a yield strength of 650MPa. In addition, niobium, titanium and manganese are alloyed in the production method of the present invention, which avoids the addition of precious elements such as Mo and Ni, thereby reducing the cost of hot-rolled steel sheets.
本发明的其他特征和优点将在随后的具体实施方式部分予以详细说明。Other features and advantages of the present invention will be described in detail in the following detailed description.
附图说明Description of drawings
附图是用来提供对本发明的进一步理解，并且构成说明书的一部分，与下面的具体实施方式一起用于解释本发明，但并不构成对本发明的限制。在附图中：The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:
图1是本发明的实施例1生产的热轧钢板的透射电镜(TEM)图。Fig. 1 is a transmission electron microscope (TEM) image of a hot-rolled steel sheet produced in Example 1 of the present invention.
图2是图1对应的能谱(EDX)图。FIG. 2 is an energy spectrum (EDX) diagram corresponding to FIG. 1 .
具体实施方式Detailed ways
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明，并不用于限制本发明。Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
根据本发明的第一个方面，本发明提供了一种热轧钢板，其中，以所述热轧钢板的总重量为基准，所述热轧钢板的元素组成包括：0.05-0.1重量％的碳、0.3重量％以下的硅、1.6-1.8重量％的锰、0.02重量％以下的磷、0.01重量％以下的硫、0.01-0.03重量％的铌、0.08-0.1重量％的钛和97.64-98.26重量％的铁；所述热轧钢板的显微组织为铁素体组织和珠光体组织。According to the first aspect of the present invention, the present invention provides a hot-rolled steel sheet, wherein, based on the total weight of the hot-rolled steel sheet, the element composition of the hot-rolled steel sheet includes: 0.05-0.1% by weight of carbon , 0.3 wt% or less of silicon, 1.6-1.8 wt% of manganese, 0.02 wt% or less of phosphorus, 0.01 wt% or less of sulfur, 0.01-0.03 wt% of niobium, 0.08-0.1 wt% of titanium and 97.64-98.26 wt% % iron; the microstructure of the hot-rolled steel plate is ferrite structure and pearlite structure.
在本发明中，无论是上述热轧钢板还是用于制备该钢板的钢水中，除了上述元素之外，还包括除硅、磷和硫之外的不可避免的杂质，由于其含量非常小，因此可以忽略不计。In the present invention, whether it is the above-mentioned hot-rolled steel sheet or the molten steel used to prepare the steel sheet, in addition to the above-mentioned elements, it also contains unavoidable impurities other than silicon, phosphorus, and sulfur, and since their content is very small, so can be ignored.
本发明的热轧钢板的厚度可以根据热轧钢板的应用条件进行选择。从板形容易控制和车辆轻量化的角度出发，所述热轧钢板的厚度优选为1.8-7mm，进一步优选为2-6mm。The thickness of the hot-rolled steel sheet of the present invention can be selected according to the application conditions of the hot-rolled steel sheet. From the perspective of easy control of the shape of the plate and the weight reduction of the vehicle, the thickness of the hot-rolled steel plate is preferably 1.8-7 mm, more preferably 2-6 mm.
本发明通过铌、钛和锰作为热轧钢板的合金化元素，在钢中起到晶粒细化和析出强化的效果。所述热轧钢板可以通过将钢水连铸成板坯，将所述板坯依次进行加热、粗轧、精轧、层流冷却和卷取制成。优选情况下，在所述热轧钢板生产过程中，板坯加热的温度为1240-1280℃，精轧的入口温度为950-1050℃，精轧的终轧温度为860-920℃，卷取的温度为580-640℃，这样不仅使形成的热轧钢板的显微组织为铁素体和珠光体组织，还可以使析出相TiC弥散分布于铁素体基体中，从而进一步提高所述热轧钢板的力学性能。In the invention, niobium, titanium and manganese are used as alloying elements of the hot-rolled steel plate to achieve the effects of grain refinement and precipitation strengthening in the steel. The hot-rolled steel plate can be produced by continuously casting molten steel into a slab, and sequentially heating the slab, rough rolling, finish rolling, laminar cooling and coiling. Preferably, in the production process of the hot-rolled steel plate, the heating temperature of the slab is 1240-1280°C, the entrance temperature of the finish rolling is 950-1050°C, the finish rolling temperature is 860-920°C, and the coiling The temperature is 580-640°C, so that not only the microstructure of the formed hot-rolled steel plate is ferrite and pearlite, but also the precipitated phase TiC can be dispersed in the ferrite matrix, thereby further improving the thermal Mechanical properties of rolled steel sheets.
本发明的所述热轧钢板的显微组织为铁素体组织和珠光体组织，并通过析出相TiC达到强化钢板的作用。这样可以避免热轧钢板由于引入贝氏体或马氏体强化而在加工(如焊接)过程中导致组织变化而使钢板的性能下降。The microstructure of the hot-rolled steel plate in the present invention is ferrite structure and pearlite structure, and the role of strengthening the steel plate is achieved through the precipitation of TiC. In this way, the performance of the hot-rolled steel plate can be avoided from being degraded due to structural changes during processing (such as welding) due to the introduction of bainite or martensite strengthening.
本发明的所述热轧钢板为一种屈服强度650MPa级的热轧钢板。优选地，所述热轧钢板的屈服强度(ReL)≥650MPa，抗拉强度(Rm)≥700MPa，延伸率(A％)≥22.0％。在本发明中，所述热轧钢板的屈服强度(ReL)、抗拉强度(Rm)和延伸率(A％)均按照GB/T228.1-2010规定的方法检测。The hot-rolled steel sheet of the present invention is a hot-rolled steel sheet with a yield strength of 650 MPa. Preferably, the yield strength (ReL) of the hot-rolled steel sheet is ≥ 650 MPa, the tensile strength (Rm) ≥ 700 MPa, and the elongation (A%) ≥ 22.0%. In the present invention, the yield strength (ReL), tensile strength (Rm) and elongation (A%) of the hot-rolled steel sheet are all tested according to the method specified in GB/T228.1-2010.
而且，本发明的所述热轧钢板的冷弯性能根据GB/T232-2010方法(B＝35，α＝180°，d＝a；d表示弯心直径、a表示试样厚度、α表示弯曲的角度、B表示试样的宽度)测定为合格。Moreover, the cold bending performance of the hot-rolled steel sheet of the present invention is according to the GB/T232-2010 method (B=35, α=180°, d=a; d represents the diameter of the bending center, a represents the thickness of the sample, and α represents the bend Angle, B represents the width of the sample) measured as qualified.
根据本发明的第二个方面，本发明提供了上述热轧钢板的生产方法，该方法包括：将钢水连铸成板坯，将所述板坯依次进行加热、粗轧、精轧、层流冷却和卷取，其中，以所述钢水的总重量为基准，所述钢水的元素组成包括：0.05-0.1重量％的碳、0.3重量％以下的硅、1.6-1.8重量％的锰、0.02重量％以下的磷、0.01重量％以下的硫、0.01-0.03重量％的铌、0.08-0.1重量％的钛和97.64-98.26重量％的铁；所述加热的温度为1240-1280℃，所述精轧的入口温度为950-1050℃，所述精轧的终轧温度为860-920℃，所述卷取的温度为580-640℃。According to the second aspect of the present invention, the present invention provides a production method of the above-mentioned hot-rolled steel plate, the method comprising: continuously casting molten steel into a slab, and sequentially heating the slab, rough rolling, finish rolling, laminar flow Cooling and coiling, wherein, based on the total weight of the molten steel, the elemental composition of the molten steel includes: 0.05-0.1% by weight of carbon, 0.3% by weight or less of silicon, 1.6-1.8% by weight of manganese, 0.02% by weight Phosphorus below 0.01% by weight, sulfur below 0.01% by weight, niobium at 0.01-0.03% by weight, titanium at 0.08-0.1% by weight and iron at 97.64-98.26% by weight; the heating temperature is 1240-1280°C, and the refined The entry temperature of rolling is 950-1050°C, the finish rolling temperature is 860-920°C, and the coiling temperature is 580-640°C.
通过Axiovert MAT200金相显微镜测试仪得出，由本发明的方法制得的热轧钢板的显微组织为铁素体组织和珠光体组织。According to the Axiovert MAT200 metallographic microscope testing instrument, the microstructure of the hot-rolled steel plate prepared by the method of the present invention is a ferrite structure and a pearlite structure.
图1是本发明的实施例1制备的热轧钢板的TEM图，图2是TEM图对应的能谱(EDX)图。结合图1和图2可以看出，本发明方法生产的热轧钢板的析出相TiC弥散于铁素体基体中。Fig. 1 is a TEM image of the hot-rolled steel sheet prepared in Example 1 of the present invention, and Fig. 2 is an energy spectrum (EDX) image corresponding to the TEM image. It can be seen from Fig. 1 and Fig. 2 that the precipitated phase TiC of the hot-rolled steel plate produced by the method of the present invention is dispersed in the ferrite matrix.
在本发明中，所述钢水可以采用本领域的常规方法制得，例如可以通过高炉炼铁、铁水预处理、转炉冶炼、钢包内脱氧、合金化炉后精炼和LF电加热等方法制得。为了使制得的钢水的组成满足上述组成要求，在转炉冶炼过程中引入适量的Mn和Si，LF电加热过程中先加Nb，再进行脱氧后引入适量的Ti，并对钢水成分进行微调。In the present invention, the molten steel can be produced by conventional methods in this field, for example, it can be produced by methods such as blast furnace ironmaking, molten iron pretreatment, converter smelting, deoxidation in ladle, post-alloying furnace refining, and LF electric heating. In order to make the composition of the prepared molten steel meet the above composition requirements, an appropriate amount of Mn and Si was introduced during the converter smelting process, Nb was first added during the LF electric heating process, and an appropriate amount of Ti was introduced after deoxidation, and the composition of the molten steel was fine-tuned.
在本发明中，所述板坯的连铸为本领域的常规连铸方法，即，所述钢水精炼后，经连铸机的中间包浇注至结晶器，分别经过拉坯、二次冷却和切割等工艺形成连铸板坯。In the present invention, the continuous casting of the slab is a conventional continuous casting method in the field, that is, after the molten steel is refined, it is poured into the crystallizer through the tundish of the continuous casting machine, and is subjected to casting, secondary cooling and cooling respectively. Continuous casting slabs are formed by cutting and other processes.
根据本发明的实施方式，所述钢水经过连铸处理后，形成的板坯厚度为200-230mm。According to an embodiment of the present invention, after the molten steel is subjected to continuous casting, the formed slab has a thickness of 200-230mm.
在本发明中，为了进一步使所述热扎钢板满足轻量化的需求，优选情况下，所述粗轧的道次为3-7，每道次的压下量控制在20-35％范围内，所述粗轧可以采用本领域技术人员常规使用的粗轧机如带AWC(自动宽度控制)功能的立辊粗轧机进行操作，所述板坯经过粗轧后(中间坯)的厚度优选为30-60mm，更优选为40-60mm。In the present invention, in order to further make the hot-rolled steel sheet meet the requirement of light weight, preferably, the number of passes of the rough rolling is 3-7, and the reduction of each pass is controlled within the range of 20-35%. , the rough rolling can be operated by using a rough rolling mill routinely used by those skilled in the art such as a vertical roller rough rolling mill with AWC (automatic width control) function, and the thickness of the slab (intermediate slab) after rough rolling is preferably 30 -60mm, more preferably 40-60mm.
根据本发明的所述方法，所述板坯经粗轧后由4-7机架进行精轧，所述精轧的入口温度为950-1050℃，优选为970-1035℃；所述精轧的终轧温度为860-920℃，优选为870-910℃。According to the method of the present invention, after rough rolling, the slab is finished rolling by 4-7 stands, and the inlet temperature of the finishing rolling is 950-1050°C, preferably 970-1035°C; The final rolling temperature is 860-920°C, preferably 870-910°C.
根据本发明的一种优选实施方式，所述精轧的条件使得形成的钢板的厚度为1.8-7mm，更优选为2-6mm。According to a preferred embodiment of the present invention, the condition of the finish rolling is such that the thickness of the formed steel plate is 1.8-7 mm, more preferably 2-6 mm.
根据本发明的所述方法，在层流冷却的过程中，为了避免所述热轧钢板中铁素体和珠光体的含量或体积分数发生较大的变化从而影响到热轧钢板的使用性能，优选情况下，所述层流冷却的冷却速度为10-50℃/s。According to the method of the present invention, in the process of laminar cooling, in order to avoid large changes in the content or volume fraction of ferrite and pearlite in the hot-rolled steel sheet, thereby affecting the performance of the hot-rolled steel sheet, preferably In some cases, the cooling rate of the laminar cooling is 10-50° C./s.
在本发明中，所述层流冷却后，板坯的温度可以为580-640℃，优选为580-625℃。In the present invention, after the laminar flow cooling, the temperature of the slab may be 580-640°C, preferably 580-625°C.
根据本发明的所述方法，所述层流冷却后对板坯进行卷取，所述板坯的卷取温度即终止冷却的温度。According to the method of the present invention, the slab is coiled after the laminar flow cooling, and the coiling temperature of the slab is the temperature at which cooling is terminated.
根据本发明的第三个方面，本发明提供了由上述方法生产的热轧钢板。由本发明所述方法生产的热轧钢板的显微组织为铁素体和珠光体组织，析出相TiC弥散于显微组织中起到强化钢板的作用。According to a third aspect of the present invention, the present invention provides a hot-rolled steel sheet produced by the above method. The microstructure of the hot-rolled steel plate produced by the method of the invention is ferrite and pearlite, and the precipitated phase TiC is dispersed in the microstructure to strengthen the steel plate.
根据本发明的第四个方面，本发明还提供了上述热轧钢板在汽车车厢上的应用。本发明合成的热轧钢板的屈服强度在650MPa以上，能作为650MPa级汽车车厢用热轧钢板。According to the fourth aspect of the present invention, the present invention also provides the application of the above-mentioned hot-rolled steel sheet on the vehicle compartment. The yield strength of the hot-rolled steel sheet synthesized by the invention is above 650MPa, and can be used as a 650MPa-level hot-rolled steel sheet for automobile compartments.
以下通过实施例对本发明作进一步详细的说明。The present invention will be described in further detail below by way of examples.
实施例1-5Example 1-5
实施例1-5用于说明本发明提供的热轧钢板及其生产方法。Examples 1-5 are used to illustrate the hot-rolled steel sheet provided by the present invention and its production method.
经常规转炉冶炼、连铸获得连铸板坯，板坯的各种成分如表1所示；将制得的连铸板坯分别依次进行板坯加热、高压水除磷、粗轧、精轧、层流冷却和卷取，从而制得热轧钢板。其中，板坯加热的温度、中间坯厚度、精轧入轧温度、精轧终轧温度、冷却速度、卷取温度和所得热轧钢板的厚度分别如表2所示。Continuous casting slabs were obtained through conventional converter smelting and continuous casting, and the various components of the slabs are shown in Table 1; the obtained continuous casting slabs were sequentially subjected to slab heating, high-pressure water dephosphorization, rough rolling, and finish rolling. , laminar cooling and coiling to produce hot-rolled steel sheets. Among them, the temperature of slab heating, the thickness of intermediate slab, the temperature of finishing rolling, the temperature of finishing rolling, the cooling rate, the coiling temperature and the thickness of the obtained hot-rolled steel plate are shown in Table 2 respectively.
对比例1Comparative example 1
经常规转炉冶炼、连铸获得连铸板坯，板坯的各种成分如表1所示；将制得的连铸板坯分别依次进行板坯加热、高压水除磷、粗轧、精轧、层流冷却和卷取，从而制得热轧钢板。其中，板坯加热的温度、中间坯厚度、精轧入轧温度、精轧终轧温度、冷却速度、卷取温度和所得热轧钢板的厚度分别如表2所示。Continuous casting slabs were obtained through conventional converter smelting and continuous casting, and the various components of the slabs are shown in Table 1; the obtained continuous casting slabs were sequentially subjected to slab heating, high-pressure water dephosphorization, rough rolling, and finish rolling. , laminar cooling and coiling to produce hot-rolled steel sheets. Among them, the temperature of slab heating, the thickness of intermediate slab, the temperature of finishing rolling, the temperature of finishing rolling, the cooling rate, the coiling temperature and the thickness of the obtained hot-rolled steel plate are shown in Table 2 respectively.
对比例2Comparative example 2
将与实施例1相同的板坯依次进行板坯加热、高压水除磷、粗轧、精轧、层流冷却和卷取，从而制得热轧钢板。其中，板坯加热的温度、中间坯厚度、精轧入轧温度、精轧终轧温度、冷却速度、卷取温度和所得热轧钢板的厚度分别如表2所示。The same slab as in Example 1 was sequentially subjected to slab heating, high-pressure water dephosphorization, rough rolling, finish rolling, laminar cooling and coiling to obtain a hot-rolled steel plate. Among them, the temperature of slab heating, the thickness of intermediate slab, the temperature of finishing rolling, the temperature of finishing rolling, the cooling rate, the coiling temperature and the thickness of the obtained hot-rolled steel plate are shown in Table 2 respectively.
表1Table 1
表2Table 2
性能测试Performance Testing
在以上实施例1-5和对比例1-2制得的热轧钢板的钢卷上取样，并按照GB/T228.1-2010规定的方法检测屈服强度(ReL)、抗拉强度(Rm)和延伸率(A％)，按照GB/T232-2010规定的方法检测冷弯性能(B＝35，α＝180°，d＝a；d表示弯心直径、a表示试样厚度、α表示弯曲的角度、B表示试样的宽度)，检测结果示于表3中。Sampling on the steel coil of the hot-rolled steel plate that above embodiment 1-5 and comparative example 1-2 make, and detect yield strength (ReL), tensile strength (Rm) according to the method that GB/T228.1-2010 stipulates And elongation (A%), according to the method specified in GB/T232-2010 to test the cold bending performance (B=35, α=180°, d=a; d represents the diameter of the bending center, a represents the thickness of the sample, α represents the bending Angle, B represents the width of the sample), the test results are shown in Table 3.
表3table 3
从上述表3的数据可以看出，采用本发明提供的生产方法制得的热轧钢板的抗拉强度达到700MPa以上，屈服强度达到650MPa以上，延伸率达到22％以上，而且冷弯性能也合格。该热轧钢板满足屈服强度650MPa级汽车车厢用的要求。且该钢种的合金成本低，具有轧制工艺控制简单和适应性强的特点。As can be seen from the data in the above table 3, the tensile strength of the hot-rolled steel plate obtained by the production method provided by the present invention reaches more than 700MPa, the yield strength reaches more than 650MPa, the elongation reaches more than 22%, and the cold bending performance is also qualified . The hot-rolled steel sheet satisfies the requirement for a yield strength of 650 MPa for automobile compartments. Moreover, the alloy cost of the steel type is low, and it has the characteristics of simple rolling process control and strong adaptability.
以上结合附图详细描述了本发明的优选实施方式，但是，本发明并不限于上述实施方式中的具体细节，在本发明的技术构思范围内，可以对本发明的技术方案进行多种简单变型，这些简单变型均属于本发明的保护范围。The preferred embodiment of the present invention has been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the specific details of the above embodiment, within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, These simple modifications all belong to the protection scope of the present invention.
另外需要说明的是，在上述具体实施方式中所描述的各个具体技术特征，在不矛盾的情况下，可以通过任何合适的方式进行组合，为了避免不必要的重复，本发明对各种可能的组合方式不再另行说明。In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way if there is no contradiction. The combination method will not be described separately.
此外，本发明的各种不同的实施方式之间也可以进行任意组合，只要其不违背本发明的思想，其同样应当视为本发明所公开的内容。In addition, various combinations of different embodiments of the present invention can also be combined arbitrarily, as long as they do not violate the idea of the present invention, they should also be regarded as the disclosed content of the present invention.
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Application publication date: 20140924 |