GB/T 22389-2023 Chinese PDF (GB/T22389-2023) GB 25596-2025 English versions: GB 30510-2024

English versions: GB 30510-2024

GB/T 21267-2024_Chinese: Petroleum and natural gas industries - Procedures for testing casing and tubing connections (Chinese: 石油天然气工业 套管及油管螺纹连接试验程序)

GB/T 44910-2024_Chinese: Amber grading (Chinese: 琥珀分级)

GBZ45378-2025_Chinese: Non-destructive testing - Methods for absolute calibration of acoustic emission transducers by the reciprocity technique (Chinese: 无损检测 基于互易性技术的声发射传感器绝对校准方法)

English versions: GB 21345-2024

GB/T 22389-2023 Chinese PDF (GB/T22389-2023) GB 25596-2025 English versions: GB 30510-2024GB T 22389 2023_Chinese: Metal oxide surge arresters without gaps for HVDC converter stations (Chinese: ) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 22389 2023