Ultrasonic measurement of high strength bolt axial tension in steel construction 钢结构工程中高强度螺栓轴向应力的超声测量技术
Ta and Nb possess the superiorities of high melting point, good ductibility, low vapor tension, causticity-resistant and high thermal conductivity and so on. They are the important raw materials of electronic, atomic, space navigation, steel and chemical industry, etc. 钽和铌具有熔点高,延性好,蒸气压低,耐蚀性强和热导率大等优良特性,是电子、原子能、宇宙航行、钢铁、化工等工业的重要原料。