0.005~0.028Ti for building has studied by 600 ℃ high temperature stress-rupture test and TEM. Test results showed that there were no-rupture for the fire-resistant steels containing compound addition 0.05%~0. 13%Mo-0.47% Nb with stress 230 MPa at 600 ℃ for5 h which meet the design requirement for fire-resistant steel
and the fireresistant properties of fire- resistant steel singly added Mo