13 wall charts of the Gray Casted Iron Gold Phase (GB/T7216-2023)
13 wall charts of the Grey Casted Iron Gold Phase (GB/T7216-2023)
1 Graphic graphite distribution pattern
2 graphite length reference scale (Pyramid)1-8Level)
3 Reference to beads
4 Reference to carbon content
5 Reference to phosphorus co-clinic content
6 Reference to phosphorus co-crystal type (Photo Cystal type)1-8Level)


