Home / Standards / GB/T 4956 GB/T 4956 Active Non-magnetic coatings on magnetic substrates—Measurement of coating thickness—Magnetic method 磁性基体上非磁性覆盖层 覆盖层厚度测量 磁性法 Standard Type GBT ICS 25.220.40;25.220.50 CCS A29 Status 现行 Issue Date 2025-10-31 Implementation 2026-05-01 Responsible Dept 中国机械工业联合会 Drafting Unit 中国机械工业联合会