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20MnHR-B plate is a steel plate for nuclear power. 20MnHR-B steel plate has good toughness and welding performance. 20MnHR-B plate specifications: thickness: 8-120mm, width: 1600-4020mm, length: 6000-17500mm.
Chemical composition of 20MnHR-B steel plate:
| Grade | C | Si | Mn | P | S | Mo |
| 20MnHR-B | ≤0.20 | 0.20-0.50 | 1.00-1.60 | ≤0.015 | ≤0.012 | ≤0.15 |
| Cr | Cu | Cu+6Sn | Nb | V | Ni | - |
| ≤0.25 | ≤0.28 | ≤0.33 | ≤0.040 | ≤0.050 | ≤0.30 | - |
20MnHR-B steel plate production process: 20MnHR-B steel is smelted by electric furnace or electric furnace + out-of-furnace refining method, using calm pouring.
Sample normalizing + simulated post-weld heat treatment:
Normalizing temperature: normalizing temperature 910±10, holding time 1.5min/mm, air cooling.
Simulated post-weld heat treatment process: holding temperature: 600±5, holding time: 10h.
