20MnNiMo steel is widely used in the manufacture of key components in fields such as large nuclear pressure vessels. The large-thickness quenched and tempered electroslag steel 20MnNiMo steel is the leading material for the manufacture of nuclear power primary circuit equipment. It has excellent comprehensive mechanical properties in the quenched and tempered state.
20MnNiMo steel chemical composition elements, finished product melting analysis:
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | V |
| 0.17-0.23 | 0.15-0.4 | 1.2-1.5 | ≤0.025 | ≤0.025 | 0.4-1 | ≤0.5 | 0.45-0.6 | ≤0.1 | ≤0.05 |
20MnNiMo steel mechanical properties:
| Delivery status | Thickness | Mechanical properties | |
| Quenched and tempered | ≤300mm | Rp0.2(MPa) | ≥345 |
| Rm(MPa) | 550-725 | ||
| A5(%) | ≥18 | ||
| Z(%) | ≥38 | ||
| Impact temperature | 20 | ||
| Akv(J) | 41 | ||
| HB | 168-229 | ||
| Impact temperature | ≤4.4 | ||
| Akv(J) | ≥41 | ||
20MnNiMo steel technical standard:
The size, shape, weight and allowable deviation of 20MnNiMo steel plate shall comply with the provisions of GB/T 709 standard.
The thickness deviation of 20MnNiMo plate shall be carried out according to the category B or C of GB/T709, which shall be indicated in the contract.
20MnNiMo steel smelting method:
Converter / electric furnace steelmaking → LF furnace refining → VD furnace vacuum degassing → continuous casting / die casting / electroslag → cleaning and heating → rolling → flaw detection → heat treatment → steel plate finishing → sampling → performance inspection.
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