Abstract: Tested steels are melting by a 50 kg medium induction furnace and rolling to 13 mm plate. The effect of rolling temperature (1 010 ~ 1 050 ℃) of tested steel 0.15Mo,R2- 0.15MoV, R3- 0.35MoNbV, R4- 0.35MoNbVB and R5- 0.35MoNbVTiB on properties of the steels has been tested. Results show that the R3 steel (/% : 0.04C,l. 12Mn, 0.32Si,0.018P,0.023S,0. 35Cr,0.35Mo,0.025Nb,0.15V) rolled at 1 030 T has excellent comprehensive properties i. e. tensile strength 598 MPa,yield strength 514 MPa,elongation 28% ,ratio of yield-tensile strength 0. 86,the HV hardness scale before and after tempering at the temperature of 600 ℃ respectively being 215 and 204, and impact energy of steel at 0 ℃ being 124 J,and the yield strength of steel at 600 ℃ being 355 MPa with ratio of yield-tensile strength 0. 69 to meet the requirement of state standard for fire-resistant steel.

摘要： 试验钢采用50 kg中频感应炉熔炼,并轧成13mm钢板。试验了R1-0.15MoNb,R2-0.15MoV,R3-0.35MoNbV,R4-0.35MoNbVB和R5-0.35MoNbVTiB耐火钢的轧制温度（1 010～1 050℃）对该钢性能的影响。结果表明,R3钢（/%:0.04C,1.12Mn,0.32Si,0.018P,0.023S,0.35Cr,0.35Mo,0.025Nb,0.15N）在1030℃轧制后具有最佳的综合性能,即抗拉强度598 MPa、屈服强度514 MPa、延伸率28%、屈强比0.86、600℃回火前后HV硬度值分别为215和204、0℃冲击功124J;600℃的屈服强度355 MPa,屈强比为0.69,满足耐火钢国家标准要求。

关键词: Nb-V微合金化, 钼, 建筑, 耐火钢, 组织, 力学性能