举高消防车臂架用BS700高强钢高温力学性能试验研究  

Experimental study on high temperature mechanical properties of BS700 steel for aerial fire truck boom

作　　者：朱贇 高志刚 刘涛[3] 张平[3] Zhu Yun;Gao Zhigang;Liu Tao;Zhang Ping(Shanghai Fire Science and Technology Research Institute of MEM,Shanghai 201199,China;XCMG Fire-Fighting Safety Equipment Co.,Ltd.,Jiangsu Xuzhou 221100,China;School of Material Science and Physics,China University of Mining and Technology,Jiangsu Xuzhou 221116,China)

机构地区：[1]应急管理部上海消防研究所,上海201199 [2]徐工消防安全装备有限公司,江苏徐州221100 [3]中国矿业大学材料与物理学院,江苏徐州221116

出　　处：《消防科学与技术》2024年第11期1571-1575,共5页Fire Science and Technology

摘　　要：高强钢BS700是70 m以上举高消防车臂架常用的结构钢,其高温力学性能决定了臂架近火服役时的结构安全。通过稳态拉伸法和恒温恒载单轴拉伸试验法对BS700钢在20~1000℃的高温力学性能进行测试,得到了不同温度下的力学性能参数及应力-应变关系曲线,并对其在300~500℃下的蠕变性能进行考察。结果表明:随着温度的升高,BS700钢的屈服强度和极限强度均逐渐降低,在500℃时近乎衰减了50%,600℃时只有室温下的30%,而当温度超过800℃时已不足10%;在400℃以内时,温度对BS700钢的断后伸长率影响不大,此后随着温度进一步升高,断后伸长率急剧增加。当温度为300~400℃、应力为380MPa时,BS700的最大蠕变应变不超过0.4%;而在500℃、相同应力条件下,最大蠕变应变达到10%。基于测定的试验数据,通过多项式拟合建立数学模型,描述了BS700高强钢高温力学性能参数随温度的变化规律,为设计70m以上举高消防车臂架的安全结构强度提供理论依据。The high-strength steel BS700 is commonly used as a structural component for the boom of aerial fire truck over 70 m,and its high-temperature mechanical properties determine the structural safety of the boom when it is in service near fire.The high-temperature mechanical properties of BS700 steel were tested using steady-state tensile testing and constant temperature and load uniaxial tensile testing methods at 20~1000℃.The mechanical property parameters and stress-strain relationship curves at different temperatures were obtained,and its creep performance at temperatures 300~500℃was investigated.The results show that the yield strength and ultimate strength of BS700 steel gradually decrease with increasing temperature,nearly decaying by 50%at 500℃,being only 30%of room temperature at 600℃,and being less than 10%when the temperature exceeds 800℃.Within 400℃,the temperature has little effect on the post-yield elongation rate of BS700 steel,but after that,as the temperature further increases,the post-yield elongation rate increases sharply.When the temperature is between 300℃and 400℃and the stress is 380 MPa,the maximum creep strain of BS700 does not exceed 0.4%;however,at 500℃under the same stress conditions,the maximum creep strain reaches 10%.Based on the measured experimental data,a mathematical model was established through polynomial fitting to describe the variation law of high-temperature mechanical property parameters of BS700 high-strength steel with temperature,providing a theoretical basis for designing the safe structural strength of booms of aerial fire truck over 70 m.

关 键 词：举高消防车 BS700高强钢 高温力学性能 高温蠕变 

分 类 号：X932[环境科学与工程—安全科学] TQ028.8[化学工程]