高温钢管的快速无损检测对于保证管体质量、降低后续加工成本具有重要的意义；研制了漏磁检测系统和具有多种冷却方式的检测探头,研究了高温钢管实施漏磁检测的信号特性,证实管体温度在居里点以下时开展漏磁检测是可行的；试验和仿真结果表明,普通探头在15～780℃下检测时,探头受温度影响大,在室温和650℃时信号分别为2.12V和2.27 V；高温探头采用风冷和水冷的方式,大大改善了探头的温度特性,信号在100～650℃范围内变化较小;铁磁性材料在居里点附近饱和磁化强度迅速下降,缺陷信号也随之减小,揭示了漏磁检测的适用温度范围.%Rapid nondestructive testing of high temperature steel pipe has important significance for guaranteeing quality of pipe and decreasing subsequent processing costs. A magnetic flux leakage (MFD testing system and high temperature sensors with various cooling method were developed. MFL signals of steel pipe at high temperature were analyzed. The feasibility findings of MFL testing of steel pipe below the Curie temperature were presented. Experimental and finite element analysis results showed the flaws were not able to evaluate accurately by traditional MFL probes which had bigger temperature drift at 15 - 780℃. MFL signal amplitude appeared.in 2. 12 V (room temperature) and 2. 27 V (650℃)) . The MFL signal of high temperature sensor had less change at 100 -650℃ by air and water cooling system. Saturation magnetization intensity of ferromagnetic material decreases abruptly near the Curie temperature, which will reveal the inspecting temperature range of MFL testing.
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