China National Standards

China 21:Ultrasonic Industry Standards English PDF List

  •  China "21:Ultrasonic" Industry Standards English PDF List:
    • Standard  Code Standard Title Standard Class Order
    TB/T 2658.21-2007 Maintenance performance. Part 21:Ultrasonic testing of rail welds
    工务作业第21部分：钢轨焊缝超声波探伤作业    		 China Railway & Train Standards
    21:Ultrasonic
    English PDF

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