Since the new high-performance piston uses ball ground cast iron profiles to process the piston head and piston skirt respectively, and then needs solid state welding. Considering the solid welding performance of nodular cast iron, QT600-7 nodular cast iron is preferred as the profile used to prepare the new high-performance low-cost piston, and the sulfur content and phosphorus content are required to be less than 0.02%. The preferred chemical composition is shown in the table.
| C | Si | Cu | Ni | Nb | Mn | S | P | Mg(residual) | Ce | Allowance |
| 3.0-3.9 | 2.4-3.0 | 0.5-1.0 | 0.5-1.0 | 0.01-0.05 | <0.4 | <0.02 | <0.02 | 0.03-0.06 | 0.02-0.04 | Fe |
The profiles can be produced by centrifugal casting with water-cooled metal mold. In this way, the ball cast iron profiles produced have fewer casting defects, finer grains and higher mechanical properties.