Home / Standards / GB/T 1839-2025 GB/T 1839-2025 Active Test method for gravimetric determination of the mass per unit area of galvanized coatings on steel products 钢产品镀锌层质量试验方法 Standard Type GBT ICS 77.040.99 CCS H21 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 中国钢铁工业协会 Drafting Unit N/A