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Chemical Composition
The finished shot shall have the chemical compositions as follows :
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Standard Hardness
The hardness of 90% of all shot particles shall be within the range of 40-50 HRc. (Rockwell C)
General Appearance
The steel shot shall be as nearly spherical as commercially possible and no more 20% of the shot particles shall have objectionable defects.
Microstructure
The microstructure of steel shot shall be uniform martensite, tempered to a degree consistant with the hardness range, with fine, well distributed carbides, if any.
Density
The density of steel grit shall be not less than 7.4 g/cc.
Size Distribution (as per SAE J 827)
| Mesh No. | Sieve (mm) |
Shot Number | |||||||||
| S-780 | S-660 | S-550 | S-460 | S-390 | S-330 | S-280 | S-230 | S-170 | S-110 | ||
| 7 | 2.800 | All Pass | |||||||||
| 8 | 2.360 | All Pass | |||||||||
| 10 | 2.000 | 85% min | All Pass | All Pass | |||||||
| 12 | 1.700 | 97% min | 85% min | 5% max | All Pass | ||||||
| 14 | 1.400 | 97% min | 85% min | 5% max | All Pass | ||||||
| 16 | 1.180 | 97% min | 85% min | 5% max | All Pass | ||||||
| 18 | 1.000 | 96% min | 85% min | 5% max | All Pass | ||||||
| 20 | 0.850 | 96% min | 85% min | 10% max | All Pass | ||||||
| 25 | 0.710 | 85% min | 96% min | 85% min | 10% max | ||||||
| 30 | 0.600 | 96% min | 85% min | All Pass | |||||||
| 35 | 0.500 | 97% min | 10% max | ||||||||
| 40 | 0.425 | 85% min | |||||||||
| 45 | 0.355 | 97% min | |||||||||
| 50 | 0.300 | 80% min | |||||||||
| 80 | 0.180 | 90% min | |||||||||