Current Status and Prospects of Fatigue Performance for 300M Steel by Single Vacuum Process for Landing Gear of Commercial Aircraft

doi:10.20057/j.1003-8620.2023-00123

Abstract

Abstract: According to the research and production status of 300M steel for commercial aircraft landing gear in China， the production process and fatigue properties of 300M steel by single vacuum melting process in China are introduced. The relation of fatigue strength， tensile strength and fracture toughness， and fatigue crack source inclusion species of 300M steel for domestic commercial aircraft landing gear are analyzed， and the market potential， future green development direction of 300M steel for commercial aircraft landing gear in China is prospected. Through research and tackle key problems， China has formed 300M steel technology by single vacuum smelting for commercial aircraft landing gear. Fushun Special steel and Bao Wu Special Metallurgy have established process production system with mass production capacity on 300M steel by single vacuum smelting.With the development of production technology， it is necessary to focus on the performance stability， purity and fatigue performance of the material， strengthen control during production， continue to optimize the melting and forging process， reduce energy consumption and costs， accumulate data and improve the material standard system. At the same time， the single vacuum 300M steel of ϕ1 080 mm and more larger ingot type is developed， which is fully in line with international standards in quality， standards， costs and certification

Key words: 300M Steel, Single Vacuum Melting Process, Tensile Strength, Fatigue Properties, Non-metallic Inclusion

摘要： 根据国内商用飞机起落架用300M钢研究和生产现状，介绍了国内单真空300M钢生产工艺以及疲劳性能控制现状，分析了国产单真空300M钢疲劳强度与抗拉强度、断裂韧性的对应关系，以及疲劳起裂过程中非金属夹杂物种类、喷丸强化作用等，展望了国内商用起落架300M钢未来市场潜力及大尺寸、高性能的绿色发展方向。通过研制攻关，国内形成了商用飞机起落架300M钢单真空冶炼技术，抚顺特钢和宝武特冶已建立了单真空300M钢生产体系且具备批量供货能力。研制生产过程中还需重点关注材料的批次稳定性、纯净度及疲劳性能，加强生产过程控制，持续优化熔炼和锻造工艺，降低能耗及成本，积累数据并完善材料标准体系，同时研制ϕ1 080 mm及更大锭型的单真空300M钢，在质量、标准、成本及认证等方面与国际全面接轨。

关键词: 300M钢, 单真空熔炼, 抗拉强度, 疲劳性能, 非金属夹杂物

CLC Number:

TG142.1

Han Shun, Li　Yong, Zhao　Suwu, Wang　Rui, Sun　Yong, Li　Jianxin, Wang　Chunxu. Current Status and Prospects of Fatigue Performance for 300M Steel by Single Vacuum Process for Landing Gear of Commercial Aircraft[J]. Special Steel, 2023, 44(5): 53-59.

韩顺, 厉勇, 赵肃武, 王瑞, 孙勇, 李建新, 王春旭. 商用飞机起落架用单真空300M钢疲劳性能控制现状及展望[J]. 特殊钢, 2023, 44(5): 53-59.

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