Home / Standards / GB 223.38-85 GB 223.38-85 Methods for chemical analysis of iron, steel and alloy — Determination of niobium content by ion exchange separation and gravimetric method 钢铁及合金化学分析方法 离子交换分离-重量法测定铌量 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A