| New grades |
Original grade |
Basic introduction |
| DD402 |
DD402 |
Long-term use below 1050°C. turbine rotor blades for advanced aero engines, etc |
| DD403 |
DD3 |
Long-term use below 1100°C. Rotor blades operating at 1040°C and guide vanes working below 1100°C for advanced aviation gas turbine engines, etc |
| DD404 |
DD4 |
Long-term use below 1050°C. Advanced aero engines with turbine rotor blades working at 1000°C and guide vanes working at 1050°C, etc |
| DD406 |
DD6 |
Long-term use below 1150°C. Advanced aero engines: gas turbines with complex internal cavities, rotor blades working at 1100°C and guide vanes working at 1150°C, etc |
| DD408 |
DD8 |
Long-term use below 1000°C. Advanced aero engine high-pressure turbine rotor blades, coastal aircraft engine turbine blades and naval gas turbine turbine blades, etc |
