摘要
为开发新型高强建筑耐火钢并提高建筑用钢的耐火性能,研究了Mo合金化和正火温度对低碳耐火钢显微组织和力学性能的影响。结果显示:Cu+Ni合金化耐火钢A经过正火处理后可获得490 MPa级耐火钢,Mo合金化耐火钢B经过正火处理后可获得590 MPa级耐火钢,且A2和B3耐火钢分别为A和B系列耐火钢中综合性能最优;A2和B3耐火钢600℃屈服强度分别为345 MPa和420 MPa,高于耐火钢对600℃下其屈服强度不小于常温下的2/3的要求,且B3耐火钢的600℃高温屈服强度明显高于A2耐火钢。B3耐火钢中含有较多的M-A岛和尺寸不等的纳米级析出相,局部可见板条马氏体,纳米级析出相可以起到第二相强化作用,从而保证耐火钢具有较高的室温强度和高温强度。
In order to develop new high-strength fire-resistant steel for buildings and improve the fire-resistant performance of construction steel,this paper studied the influence of Mo alloying and normalizing temperature on the microtissue and mechanical properties of low-carbon fire-resistant steel.Cu+Ni alloying fire-resistant steel A can turn into 490 MPa fire-resistant steel after normalizing treatment.Mo alloying fire-resistant steel B can turn into 590 MPa fire-resistant steel after normalizing treatment,with A2 and B3 fire-resistant steel the best in A and B series of fire-resistant steel.The yield strength of A2 and B3 fire-resistant steel at 600℃are 345 MPa and 420 MPa,higher than 2/3 of the yield strength in room temperature,and the yield strength of B3 fire-resistant steel at 600℃is significantly higher than that of A2 fire-resistant steel.B3 fire-resistant steel contains many nanoscale precipited phase of M-A island and different size,and its local parts show visible lath martensite.The nanoscale precipited phase can play a second phase reinforcement role to ensure high room temperature and high temperature strength for fire-resistant steel.
作者
张芳
郝进锋
Zhang Fang;Hao Jinfeng(Qinhuangdao Campus,Northeast Petroleum University,Qinhuangdao 066004,China)
出处
《甘肃科学学报》
2020年第4期78-82,共5页
Journal of Gansu Sciences
关键词
钼
耐火钢
正火温度
组织
力学性能
Mo
Fire-resistant steel
Normalizing temperature
Tissue
Mechanical properties
