According to the technical requirements, the metallographic inspection shall be carried out for the spheroidal ductile cast iron blank, and the attached test block shall be taken. The inspection results are shown in Figure 1 and Table.
| Inspection items | Spheroidization grade | Graphite size | Ferrite | Pearlite | Cementite | Organization |
| Standard value | Level 1-3 | Grade 5~7 | ≥ 95% | ≤ 5% | ≤ 1% | Ferrite+graphite |
| Measured value | Level 2 | Grade 6 | > 95% | < 5% | 0 | Ferrite+graphite |
According to the technical requirements, the NDT test was carried out on the nodular cast iron blank, and the test results met the requirements, as shown in Figure 2.
| Inspection items | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture (%) | Brinell hardness (HBW) | Room temperature impact absorbed energy/J |
| Standard value | ≥ 240 | ≥ 370 | ≥ 12 | 130~180 | Average value ≥ 12, single value ≥ 9 |
| Measured value | 267 | 392 | 25.5 | 138 | 18,19,19 |