Refractory metal core

Claims for forming a gas turbine engine part casting system. The first implementation example, the casting system comprises a forming is sleeved difficult the casting core according melting metal plate to form, a difficultly molten metal plate is provided with an inner multiple film cooling method channels' multiple the structure, wherein the structure is from of difficultly molten metal material of the plate arranged out part to form. The second implementation example, casting system comprising a wing section of metal plate, and adjacent and is provided with a metal plate with the is difficult a metal mould core is a metal plate shape relatively. The invention is further provided with the difficult a metal mould core for the casting system.