论文部分内容阅读
Trials to develop a C-Mn-Mo-Nb type fire-resistant steel have been carried out by adopting recrystallization rolling (RCR) + air cooling (AC),two-stage rolling (TSR) + AC and RCR + water cooling (WC).Both RCR and TSR followed by AC resulted in polygonal ferrite (F) + pearlite (P) microstructure,while F + bainite (B) microstructure was formed by RCR + WC.The plates with F+P microstructure show tensile strengths ≥490MPa,while those with F+B exhibit tensile strengths ≥590MPa.All the plates show favorable low yield ratios ≤ 0.75,good charpy v-notch impact property >101J at 0℃ and satisfactory high temperature strength (≥2/3 of room temperature yield strength retained at 600℃).
Trials to develop a C-Mn-Mo-Nb type fire-resistant steel have been carried out by adoption of recrystallization rolling (RCR) + air cooling (AC), two-stage rolling (TSR) + AC and RCR + water cooling ). Both RCR and TSR followed by AC induced in polygonal ferrite (F) + pearlite (P) microstructure, while F + bainite (B) microstructure was formed by RCR + WC.The plates with F + P microstructure show tensile strengths ≥490 MPa , while those with F + B exhibit tensile strengths ≥ 590 MPa. All plates show favorable low yield ratios ≤ 0.75, good charpy v-notch impact property> 101 J at 0 ° C and satisfactory high temperature strength (≥2 / 3 of room temperature yield strength retained at 600 ℃).