GB/T 9790-1988 "Metal overlay and Miscellaneous related overlay, Vickers and Knoop microhardness test", specifies the test method of Vickers and Knoop microhardness for metal and related overlay. The standard specifies the test principle, equipment, sample requirements, operation steps and hardness value calculation. It provides a standardized process for accurate determination of microhardness of overlay, which helps to evaluate the hardness performance of overlay and ensure the scientific and conformity of mass detection of overlay.
| Status | Abolish |
|---|---|
| CCS | A29 | ICS | 25.220.40 |
| Release Date | 1988-09-05 00:00:00 | Implementation Date | 1989-09-01 00:00:00 |