Old boiler material
Old boiler material
(OP)
Hello everyone,
During a inspection by replica technique in a 40 year old boiler, we got to these micrographs. The first one belongs to the corrugated furnace (seems like no microstructural degradation) and the second to a ring located in the mouth of the furnace. The client provided us a sample of this material for chemical composition analysis and metalography. The results of chemistry where 0.0381 C, 0.310 Mn, <0.0100 Si, 0.0431 P, 0.0202 S. Not other elements in significant quantities. Metalography shows mainly the same microstructure in the entire thickness of the plate (1/2"), looks like ferritic matrix with massive carbides (third micrograph). Finally the question, should that material be used in a boiler furnace? could have something to do with the time of fabrication? (1975)
Thank you!
[img http://imgur.com/w86iorZ]
[img http://imgur.com/6vAzMYP]
[img http://imgur.com/ZzH6k7W]
During a inspection by replica technique in a 40 year old boiler, we got to these micrographs. The first one belongs to the corrugated furnace (seems like no microstructural degradation) and the second to a ring located in the mouth of the furnace. The client provided us a sample of this material for chemical composition analysis and metalography. The results of chemistry where 0.0381 C, 0.310 Mn, <0.0100 Si, 0.0431 P, 0.0202 S. Not other elements in significant quantities. Metalography shows mainly the same microstructure in the entire thickness of the plate (1/2"), looks like ferritic matrix with massive carbides (third micrograph). Finally the question, should that material be used in a boiler furnace? could have something to do with the time of fabrication? (1975)
Thank you!
[img http://imgur.com/w86iorZ]
[img http://imgur.com/6vAzMYP]
[img http://imgur.com/ZzH6k7W]





RE: Old boiler material
RE: Old boiler material
RE: Old boiler material
RE: Old boiler material
Thanks for the follow-up information. The description of the ring sounds vague to me as the mouth of the furnace. If this is the case, I would still think that radiant heat or flue gas impingement even only 5" away can result in spheroidization damage after 40 years of service especially on unprotected surfaces. Was there refractory on this ring material?
RE: Old boiler material