The entire reformer furnace tube is analyzed and studied through OM, SEM and mechanical property test in this work. The microstructure of centrifugal casting tube and weld joint has deteriorated, with the primary carbides coarsened and growth. The primary carbides at the dendrite boundary have grown from lamellar and skeleton shape to continuous network and chain shape, and the primary carbides M7C3 and Nb(Ti)C transformed into M23C6 and G phase. The high temperature creep strength of reformer furnace tube decreased obviously. Through the investigation of the microstructure and mechanical properties of different zones in the entire reformer furnace tube, the weakest part of the reformer furnace tube is located in the middle and lower zone, and its remnant life h as been predicted. On the basis of the design temperature and pressure, the remnant life of this reformer furnace tube is 38000 hours. ARTICLE HISTORY Received 2 March 2025 Accepted 19 June 2025 KEYWORDS HPNbM alloy; reformer furnace tube; remnant life; carbide; creep strength Introduction With the rapid development of the petrochemical industry, factors such as the reduction in raw material quality and increasing demands for product purity have driven continual improvements in production technology [1,2]. Consequently, the service environ ment of production equipment is evolving towards extreme working conditions, such as high temperature and high pressure [3]. In petrochemical industry, the r
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