Microstructure and corrosion resistant property research of super 304H and TP347H heat-resistant steel welding joint

Microstructure of Super 304H and TP347H austenitic heat resistance steel welding joint by handwork argon tungsten-arc welding and electro-chemical corrosion property of weld metal and two base materials were investigated by SEM and M273 constant potential rectifier. The results shows that microstructure of the weld metalwere austenitic matrix + delta ferrite; In 5% HCl Solution, corrosion resistant capabilities were super 304H base material> weld metal>TP347H base material; in 9.8% H2SO4 Solution, corrosion resistant capabilities were Super 304H base material>TP347H base material> weld metal; Super 304H and TP347H austenitic heat resistance steel welding joint has better corrosion resistant property in HCl solution than in H2SO4 solution; Inter-crystalline corrosion results were consistence to results electro-chemical corrosion experiment in 9.8% H2SO4 solution.