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Abstract：
On-stream inspections are the most appropriate method for routine inspections during plant operation without undergoing production downtime. Ultrasonic inspection, one of the on-stream inspection methods, faces challenges when performed at high temperatures exceeding the recommended 52 °C. This study aims to determine the ultrasonic velocity and attenuation with known material grade, thickness, and temperatures by comparing theoretical calculation and experimentation, with temperatures ranging between 30 °C to 250 °C on low-carbon steel, covering most petrochemical equipment material and working conditions. The aim of the theoretical analysis was to obtain Young\'s modulus, Poisson\'s ratio, and longitudinal velocity at different temperatures. The experiments validated the theoretical results of ultrasonic change due to temperature increase. It was found that the difference between the experiments and theoretical calculation is 3% at maximum. The experimental data of velocity and decibel change from the temperature range provide a reference for the future when dealing with unknown materials information on site that requires a quick corrosion status determination.
摘要：
在工厂运行期间，在不经历生产停机的情况下，生产检查是最适合的常规检查方法。超声波检查,在线检查方法之一，在超过推荐的52°C的高温下进行时面临挑战。本研究旨在确定已知材料等级的超声波速度和衰减，厚度,通过比较理论计算和实验，低碳钢的温度范围在30°C至250°C之间，涵盖大多数石化设备的材料和工作条件。理论分析的目的是获得杨氏模量，泊松比，和纵向速度在不同的温度。实验验证了温度升高引起的超声变化的理论结果。发现实验和理论计算之间的差异最大为3%。来自温度范围的速度和分贝变化的实验数据为将来在需要快速确定腐蚀状态的现场处理未知材料信息提供了参考。
