The working environment of wind power casting is in the harsh field, and it has been subjected to wind, sun and rain for a long time. Therefore, the quality requirements of wind power casting should be compared with the quality requirements of nuclear power and aerospace casting. Wind power casting mainly include the hub of the blade, the gear box, the mechanical gantry and the base member.
The material requirements for wind power casting are: QT400-18AL, QT700-2, QT350-22AL material grades. Various materials must meet the tensile strength, yield strength, elongation, impact toughness, hardness, and high internal and external integrity and density of the standard or user requirements. All castings are not allowed to be repaired by welding, and they must undergo strict ultrasonic testing and magnetic particle testing.
The QT400-18AL material is required to meet the low temperature impact performance of minus 20 ° C. The QT350-22AL material is required to meet the low temperature impact performance of minus 40 ° C. In the production process of wind power casting, the smelting and treatment of molten iron is a very important and technically demanding process, which has a significant impact on the material quality of the castings, both inside and outside.