新型布氏硬度计在火电施工现场的应用实例

Instance of a New Type of Brinell Hardness Tester Applied in the Thermal Power Construction Site

摘要: 对某电厂2 × 660 MW超超临界火力发电机组的P92钢主蒸汽和再热热段管道焊缝硬度，应用新型布氏硬度计进行工业实践。对比里氏硬度计与布氏硬度计的工作原理及其优缺点，探讨此种新型布氏硬度计的技术合理性、现场适用性，以期真实、准确的反映火电施工现场管道焊缝的焊后热处理硬度。结果表明，该新型布氏硬度计具有示值重复性好、精度高、数据真实的优点。

Abstract: Based on the new kind of Brinell hardness tester, the author measured the weld hardness of the reheat pipe weld and main Steam pipe adopted P92 steel used in superheater of ultra-supercriti- cal coal-fired unit with 2 × 660 MW located in one power plant. The working principle as well as the advantages and disadvantages of Leeb hardness tester and Brinell hardness tester was compared, and the technical rationality and site suitability of this new type of Brinell hardness tester were also discussed so as to truly and accurately reflect the heat treatment hardness of weld joint after welding in the thermal power construction site. Results showed that this new type of Brinell hardness tester has advantages including indicating value of good repeatability, high precision, and real data.