2010
DOI: 10.3989/revmetalm.0939
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Microstructural analysis as the indicator for suitability of weld repairing of the heat resistant Cr - Ni steel

Abstract: Metallurgical evaluation was performed on a fractured column tube of the reformer furnace in an ammonia plant. The tubes were manufactured from centrifugally cast heat resistant steel HK 40. Optical and scanning electron microscope (SEM) were used for microstructural and fracture analysis. For composition determination of the microconstituents energy dispersive X ray spectroscopy (EDS) was used. To evaluate mechanical properties, hardness and microhardness measurements were performed. Investigations based on t… Show more

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