宝钢高强度气瓶管的开发与组织性能研究  

Development of High Strength Gas Cylinder-purposed Seamless Pipe by Baosteel and Study on its Microstructure and Mechanical Properties

作　　者：王康 胡平[1,3] 岳世斌 WANG Kang;HU Ping;YUE Shibin(Baoshan Iron&Steel Co.,Ltd.,Shanghai 201900,China;Yantai Lubao Steel Pipe Co.,Ltd.,Yantai 265500,China;Baosteel R&D Center,Shanghai 201900,China)

机构地区：[1]宝山钢铁股份有限公司,上海201900 [2]烟台鲁宝钢管有限责任公司,山东烟台265500 [3]宝山钢铁股份有限公司中央研究院,上海201900

出　　处：《钢管》2024年第3期30-35,共6页Steel Pipe

摘　　要：开发抗拉强度1100 MPa及以上的高强度高韧性无缝气瓶管是实现气瓶轻量化的重要基础。在传统34CrMo4气瓶钢的基础上,通过采用增Mo、加Ni辅助微合金化控制以及控制夹杂物等级和N含量等技术手段,成功开发了抗拉强度≥1100 MPa,延伸率≥14%,-50℃低温横向冲击韧性≥60 J/cm^(2)的高强度高韧性气瓶管,并在国内首次实现批量商业化应用。热处理试验结果表明,随着回火温度的升高,高强度气瓶钢的强度逐渐降低,塑性和低温韧性逐渐改善,这主要与组织中板条粗化和析出相发生粗化、聚集等的变化有关。为获得良好的强韧性匹配,推荐淬火温度为860℃,回火温度为520~560℃。It is regarded that development of the gas cylinder-purposed seamless pipe with tensile strength equal to or higher than 1100 MPa and high strength/high toughness is the important foundation for producing the lightweight gas cylinder.Based on the conventionally-used 34CrMo4 steel for cylinder-making,and owing to taking such measures as increasing Mo and adding Ni to assist the micro-alloying control,controlling the inclusion level and N content,etc.,the high strength/high toughness gas cylinder-purposed pipe is successfully developed.The pipe as developed features such mechanical properties i.e.,the tensile strength≥1100 MPa,elongation≥14%,and-50℃low temperature transversal impact toughness≥60 J/cm^(2).Moreover the pipe has been put into massive commercial application,being the first case in the country.The heat treatment result of the pipe shows that along with the rise of the temper temperature,the pipe’s strength is getting down,whereas its plasticity and low-temperature toughness are getting better,which is resulted from the microstructure evolution,such as coarsening of the martensite lath,and the coarsening and aggregation of the precipitation phase.Appropriate heat-treatment procedure for good strength and toughness balance is recommended,i.e.,quenching at 860℃and tempering at 520~560℃.

关 键 词：气瓶管 高强度 金相组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]