Carbon Steel Microstructure
Carbon Steel Microstructure
(OP)
I recently posted a thread on pinhole leaks in carbon steel and just sectioned and mounted a sample from one of the tubes in the HVAC unit and found something interesting but confusing...
The microstructure on the OD of the tube (closest to the aluminum fins) looks different than the microstructure on the ID. The ID and into the middle of the tube looks to be austenite and ferrite but the other half of the tube (OD) looks to be just austenite. Does anyone know what could be happening here? I thought it could possibly be spheroidizing on the outside but that doesn't make sense since the outside isn't exposed to the high temps. Has anyone ever seen this in tubing or anywhere before? Help! Thanks!
The microstructure on the OD of the tube (closest to the aluminum fins) looks different than the microstructure on the ID. The ID and into the middle of the tube looks to be austenite and ferrite but the other half of the tube (OD) looks to be just austenite. Does anyone know what could be happening here? I thought it could possibly be spheroidizing on the outside but that doesn't make sense since the outside isn't exposed to the high temps. Has anyone ever seen this in tubing or anywhere before? Help! Thanks!





RE: Carbon Steel Microstructure
RE: Carbon Steel Microstructure
are you sure of the type of material? what is the ASTM spec for the material?
Corrosion Prevention & Corrosion Control
RE: Carbon Steel Microstructure
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Hope it helps
luis marques