Abstract: Low-alloy high-strength fastener stee which is widely used in automobiles， high-speed rail， aviation， aerospace， defense， and other fields due to its excellent mechanical properties and in line with the trend of lightweight development. In recent years， with the continuous progress of industrial technology and the increasing requirements for material performance， the development of low-alloy high-strength fastener steel has shown a new trend. It is expected that the actual practical application strength level of fasteners will exceed grade 16.8. In this paper， through the typical application of fasteners products， firstly it points out that fasteners require good mechanical properties， processing performance， and heat treatment performance. Specific performance and application environment-based evaluation is carried out to ensure safety and reliability. Secondly， this paper analyzes the history and trends of high-strength fastener steel， including high-strength fastener steel， ultra-high-strength fastener steel， and non-quenching high-strength fastener steel， and discusses the role of composition in enhancing steel properties. Then， the paper introduces the research and application of key technologies for high-strength fastener steel， focusing on the design of steel composition， control of non-metallic inclusions， resistance to delay fracture and steel manufacturing technology. The paper also discusses the impact of related content on product performance， in order to enhance the comprehensive performance of fasteners， reduce their hydrogen embrittlement sensitivity， and meet the requirements of intelligent manufacturing， it is necessary to keep the ［H］ content in steel below 1×10-6， further reduce the size of inclusions， and control the fluctuation range of main elements in steel more precisely： w［C］±0.01%， w［Si］±0.02%， w［Mn］±0.02%， w［Mo］±0.01%， the development of low hydrogen embrittlement sensitive bainitic steel is rapidly advancing.At the same time， while environmental regulations become increasingly strict， the concept of green manufacturing and recyclability is gradually incorporated into the production of low-alloy high-strength fastener steel，and the proportion of electric furnace steel smelting and hydrogen metallurgy varieties has significantly increased..Finally， the paper looks ahead to the future of low-alloy high-strength fastener steel， which will move towards high performance， low cost， environmental protection， and intelligentization. With the progress of science and technology and changes in market demand， low-alloy high-strength fastener steel will play an important role in a wider range of fields and provide a solid material basis for the development of modern industry.

Key words: High strength, Fasteners, Bolts, Delayed fracture, Hydrogen Embrittlement, Light Weight

摘要： 低合金高强度紧固件钢因其优良的力学性能，符合轻量化发展趋势，广泛应用于汽车、高铁、航空、航天、国防等领域。近年来，随着工业技术的不断进步和对材料性能要求的提高，低合金高强度紧固件钢的发展呈现出新的趋势，预计紧固件实际应用强度级别将突破16.8级。首先通过紧固件产品的典型应用，指出紧固件要求具有良好的力学性能、加工性能及热处理性能，针对特定性能和应用环境实施特别评价，确保安全可靠。其次，分析了高强紧固件钢发展历史及趋势，包括高强紧固件、超高强紧固件及非调质高强紧固件等成分，探讨了成分对钢材性能的提升作用。接着，针对高强度紧固件钢关键技术的研究及应用情况进行介绍，重点对高强紧固件钢成分设计、非金属夹杂物控制、抗延迟断裂研究及钢材制造技术，探讨了相关内容对产品性能的影响，为提高紧固件综合性能，降低氢脆敏感性，满足其制造智能化发展，需使钢中w［H］＜1×10-6，进一步减小夹杂物尺寸，钢中主元素波动范围控制更精确： w［C］±0.01%，w［Si］±0.02%，w［Mn］±0.02%，w［Mo］±0.01%，低氢脆敏感贝氏体钢快速发展，同时，随着环保法规的日益严格，绿色制造和可循环利用的理念也逐渐渗透到低合金高强度紧固件钢的生产中，电炉钢冶炼及氢冶金品种占比大幅提升。最后，展望了低合金高强度紧固件钢的未来将朝着高性能、低成本、环保和智能化的方向发展。随着科技的进步和市场需求的变化，低合金高强度紧固件钢将在更广泛的领域中发挥重要作用，为现代工业的发展提供坚实的材料基础。

关键词: 高强度, 紧固件, 螺栓, 延迟断裂, 氢脆, 轻量化