Auto Stamping Parts. Making Process:Punching,stamping,bending,welding,riveting A leader & a 12 ... steel,carbon steel,hot rolled steel , copper, iron,etc.3.Making process--Punching,stamping,bending,welding,riveting4.Surface treatment --galvanized ,copper ... cartons- -or your request9.Certificate --ISO9001:2000, ISO14000 Seat Frame/Auto Seat Parts