里氏硬度无损检测钢材牌号的试验

Experiments of Determining Steel Grades by Nondestructive Inspection of Leeb Hardness

钢结构检测是钢结构质量和安全控制的重要手段,其中,钢材强度或牌号是钢结构检测的一项重要指标,为工程质量评价、安全评估及加固改造提供了重要依据。实践表明:现有的检测方法都存在一定的缺点,无法满足工程的需求。通过大量里氏硬度和钢材拉伸强度试验,对试验结果进行统计分析,确定了一种采用里氏硬度法判别钢材牌号的方法,给出了里氏硬度判别Q235和Q345的界限值,该方法能够满足现场检测的要求,且对原结构的损伤较少。

Steel structure detection is an important method of steel structure quality and safety control. Steel strength or designation is an important index of steel structure detection, which provides an important basis for engineering quality evaluation, safety evaluation and reinforcement. The practice showed that the existing detection methods have some shortcomings and can not meet the requirements of engineering. In this paper, through a large number of Leeb hardness and steel tensile strength tests, the test results were statistically analyzed, a method for judging steel grade by Leeb hardness method was determined, and the limit values of Leeb hardness for Q235 and Q345 were obtained. The engineering verification showed that this method could meet the requirements of field detection and caused less damage to the original structure.