- Standard No.
- GB/T 223.21-1994
- Language
- Chinese, Available in English version
- Release Date
- 1994
- Published By
- General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
- Latest
-
GB/T 223.21-1994
- Replace
-
GB 223.21-1982
- Scope
- This standard specifies the determination of cobalt content by 5-Cl-PADAB spectrophotometry. This standard applies to the determination of drill bit in carbon steel and alloy steel. Measuring range: 0.0050% to 0.50%.
GB/T 223.21-1994 history
- 1994 GB/T 223.21-1994 Methods for chemical analysis of iron steel and alloy.The 5-CL-PADAB spectrophotometric method for the determination of cobalt content
- 1982 GB 223.21-1982 Chemical analysis of iron,steel and alloy--The determination of cobalt by the 5-Cl-PADAB photometric method
GB/T 223.21-1994 Methods for chemical analysis of iron steel and alloy.The 5-CL-PADAB spectrophotometric method for the determination of cobalt content has been changed from GB 223.21-1982 Chemical analysis of iron,steel and alloy--The determination of cobalt by the 5-Cl-PADAB photometric method.