高强度轻量化汽车大梁用钢的研究与开发

发布时间：2018-05-24 10:55

本文选题：汽车大梁钢 + 轻量化　；参考：《山东大学》2016年硕士论文

【摘要】：本课题结合济钢的工艺、技术和装备条件,研究600-700MPa级系列高强轻量化汽车大梁钢。本文在济钢MS-200热模拟试验机上进行实验,结合汽车大梁钢的特点,以C、Si、Mn为主要成分,添加适量铌、钛微合金元素,系统应用多种强化机制轧制高强钢。通过对实验钢的实验室研究工作确定了J610L和J700的工艺窗口,设计了合理的工业试制轧制工艺方案,开展了工业试制。通过实验表明,J610L和J700热轧钢带总体性能较好,强度较高,抗疲劳性能及其焊接性能达到预期,冷成型性能和低温冲击韧性测试结果优良。更加可取之处是该钢在保证承载能力的前提下,车身重量得当下降,可有效降低油耗,提高运行效率,为车辆轻量化设计提供有益参考。本文研究的主要内容和结论包括：(1)在济钢热连轧生产线上,开发出J610L、J700高强韧性的汽车大梁用钢,该钢韧脆转变温度在-60℃以下,冷弯性能优良,J610L的疲劳极限在500MPa以上(疲劳试验应力比R=0.1),J700抗拉强度在690 MPa,焊接性能优良,尺寸精度高,可满足汽车车架冲压、辊压、折弯、装配等工艺要求。(2)采用低碳(0.05-0.10%),高锰(1.60-2.0%),铌、钛复合微合金化,不添钼、铬、镍、钒等元素,生产出纯度较高的中薄板坯,该成分设计大幅降低了高成本的合金元素的加入,利于冶炼及后期回收再利用。
[Abstract]:Based on the technology, technology and equipment conditions of Jigang, this paper studies the 600-700MPa series high strength and lightweight steel beam steel. This paper has conducted experiments on the MS-200 thermal simulation test machine of Jigang. Combined with the characteristics of the automobile beam steel, C, Si and Mn are used as the main components to add a proper amount of niobium and titanium microalloyed elements, and the system is used for many kinds of strengthening mechanisms to roll high strength. Steel. Through the laboratory research work of the experimental steel, the process window of J610L and J700 was determined. A reasonable industrial trial rolling process was designed and the industrial trial production was carried out. Through the experiment, the results showed that the overall performance of the J610L and J700 hot rolled steel strip was better, the strength was higher, the fatigue resistance and welding performance reached the expected, cold forming performance and low temperature. The results of impact toughness test are excellent. It is more desirable that the weight of the body falls properly on the premise of guaranteeing the bearing capacity, which can effectively reduce the oil consumption and improve the operation efficiency. The main contents and conclusions of this paper are as follows: (1) J610L, J700 is developed in the hot continuous rolling line of Jigang. High strength and toughness automobile beam steel, the steel ductile brittle transition temperature below -60 C, good cold bending performance, J610L fatigue limit above 500MPa (fatigue test stress ratio R=0.1), J700 tensile strength of 690 MPa, good welding performance, high dimensional precision, can meet the vehicle frame stamping, roll pressure, bending, assembly and other technological requirements. (2) low carbon ( 0.05-0.10%), high manganese (1.60-2.0%), niobium, titanium microalloying, without adding molybdenum, chromium, nickel, vanadium and other elements to produce high purity medium thin slab, which greatly reduced the addition of high cost alloy elements, conducive to smelting and recovery and reuse.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TG335

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