The difference between 15Mo3 steel plate and 16Mo3 steel plate in chemical composition:
| Grade | C | Si | Mn | P | S | Cr | Cu | Mo | Ni | N |
| 15Mo3 | 0.12-0.20 | 0.10-0.35 | 0.40-0.90 | ≦0.035 | ≦0.030 | ≦0.25 | ≦0.30 | ≦0.30 | ||
| 16Mo3 | 0.12-0.20 | ≦0.35 | 0.40-0.90 | ≦0.025 | ≦0.010 | ≦0.30 | ≦0.30 | 0.25-0.35 | ≦0.30 | ≦0.012 |
The difference between 15Mo3 steel plate and 16Mo3 steel plate in mechanical properties:
| Grade | Yield Strength | Tensile Strength | Elongation |
| (Mpa) | (MPa) | (%) | |
| 15Mo3 | ≧275 | 440-590 | ≧20 |
| 16Mo3 | ≧275 | 440-590 | ≧22 |
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