Home / Standards / GB/T 5617 GB/T 5617 Active Determination of surface hardening depth for steel 钢件表面淬火硬化层深度的测定 Standard Type GBT ICS 25.200 CCS J36 Status 现行 Issue Date 2025-08-29 Implementation 2026-03-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委