Standard Microstructure（YAMAMOTO）
| Standard Microstructure | Group 1 | Ferrous-Carbon Steel ・ Cast Iron | 25Types |
| Group 2 | Alloy Tool Steel ・ High Speed Steel | 25Types | |
| Group 3 | Structural Alloy Steel ・ Steel for Special uses | 25Types | |
| Group 4 | Standard Microstructure ・ Non-ferrous Alloy | 25Types | |
| Group 6 | Standard Microstructure ・ Surface modification of Metals | 25Types | |
| Group 7 | Standard Microstructure ・ abnormal Structure | 23Types |