本文選題：汽車大梁鋼 + 輕量化　； 參考：《山東大學》2016年碩士論文

【摘要】：本課題結合濟鋼的工藝、技術和裝備條件,研究600-700MPa級系列高強輕量化汽車大梁鋼。本文在濟鋼MS-200熱模擬試驗機上進行實驗,結合汽車大梁鋼的特點,以C、Si、Mn為主要成分,添加適量鈮、鈦微合金元素,系統(tǒng)應用多種強化機制軋制高強鋼。通過對實驗鋼的實驗室研究工作確定了J610L和J700的工藝窗口,設計了合理的工業(yè)試制軋制工藝方案,開展了工業(yè)試制。通過實驗表明,J610L和J700熱軋鋼帶總體性能較好,強度較高,抗疲勞性能及其焊接性能達到預期,冷成型性能和低溫沖擊韌性測試結果優(yōu)良。更加可取之處是該鋼在保證承載能力的前提下,車身重量得當下降,可有效降低油耗,提高運行效率,為車輛輕量化設計提供有益參考。本文研究的主要內容和結論包括：(1)在濟鋼熱連軋生產(chǎn)線上,開發(fā)出J610L、J700高強韌性的汽車大梁用鋼,該鋼韌脆轉變溫度在-60℃以下,冷彎性能優(yōu)良,J610L的疲勞極限在500MPa以上(疲勞試驗應力比R=0.1),J700抗拉強度在690 MPa,焊接性能優(yōu)良,尺寸精度高,可滿足汽車車架沖壓、輥壓、折彎、裝配等工藝要求。(2)采用低碳(0.05-0.10%),高錳(1.60-2.0%),鈮、鈦復合微合金化,不添鉬、鉻、鎳、釩等元素,生產(chǎn)出純度較高的中薄板坯,該成分設計大幅降低了高成本的合金元素的加入,利于冶煉及后期回收再利用。
[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.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TG335

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本文編號：1928797