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01389 LOCAL HEAVY CARBURIZATION OF OLEFIN PYROLYSIS FURNACE TUBE

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Product Number: 51300-01389-SG
ISBN: 01389 2001 CP
Author: A. Kh. Bairamov and R. Bradley
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The results of this investigation, which revealed heavy carburization in a 25Cr/35Ni/1.5Nb olefin pyrolysis furnace tube being operated at about 850°(2 for approximately one year, are discussed. Severe localized damage was in the shape of isolated rounded cavities with diameters of 6-8 mm and depth of about 2 mm. Optical microscopy and SEM/EDX analysis of the areas under the pits showed secondary carbide precipitation at the grain boundaries and within the grains along with heavy intergranular attack up to complete separation of grains. The presence of three phases enriched by Cr or Nb along with chromium depleted regions adjacent to the grain boundaries were also revealed. Microhardness tests revealed hardnesses, which were 70-90% higher in the heavily carburized regions (exactly under the pits) than in the other unaffected regions. The results of the examination made it possible to conclude that the furnace tube failed due to a phenomenon known as metal dusting caused by the local deposition of"green oil" on the tube surface at the inlet of the furnace. Keywords: Olefin pyrolysis, green oil, furnace tube, secondary carbide, metal dusting, microhardness.
The results of this investigation, which revealed heavy carburization in a 25Cr/35Ni/1.5Nb olefin pyrolysis furnace tube being operated at about 850°(2 for approximately one year, are discussed. Severe localized damage was in the shape of isolated rounded cavities with diameters of 6-8 mm and depth of about 2 mm. Optical microscopy and SEM/EDX analysis of the areas under the pits showed secondary carbide precipitation at the grain boundaries and within the grains along with heavy intergranular attack up to complete separation of grains. The presence of three phases enriched by Cr or Nb along with chromium depleted regions adjacent to the grain boundaries were also revealed. Microhardness tests revealed hardnesses, which were 70-90% higher in the heavily carburized regions (exactly under the pits) than in the other unaffected regions. The results of the examination made it possible to conclude that the furnace tube failed due to a phenomenon known as metal dusting caused by the local deposition of"green oil" on the tube surface at the inlet of the furnace. Keywords: Olefin pyrolysis, green oil, furnace tube, secondary carbide, metal dusting, microhardness.
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