Abstract: A rutile type SG90T-9C slag-gas bonded protection flux cored welding wire was developed. The effect of the amount of silicon and manganese on microstructure and properties of the welding wire deposited metal and weld metal by welding Q960E steel was studied. The effect of heat input on morphology of M/A island in the weld microstructure was studied. The comprehensive properties of SG90T-9C welding wire were compared with CHT91K2, ESAB91K2 welding wires and H08Mn2SiA welding wire coupling HJ431 flux. The results show that with increasing manganese and silicon addition, the tensile strength of the deposited metal increased, and the impact toughness increased and then decreased. With increasing heat input, the M/A island shape changed from point to block and the island gathered on boundaries. The heat input should be controlled within 10 kJ·cm^-1. Compared with other welding materials, the SG90T-9C welding wire deposited metal had excellent mechanical properties, the weld quality by welding Q960E steel was better, and the porosity and repair rate by welding Q960E steel frame reduced significantly.