I just toured an old foundry built around 1911 in the midwest. It is riveted steel frames supporting a tectum type roof. The structure has been many things over many years including abandoned and a paper mill. The roof leaks all over the place. Based on everything I know about existing industrial structures, this steel should be in rough shape with severe corrosion and section loss. However, while there may be a bit of "mill scale" on the surface, the steel looks better than some new steel I have seen laying in puddles on job sites. Even columns that have been hit by equipment over the years do not show any amount additional corrosion. Does anyone know of a weathering steel from that era? I know COR-TEN did not show up until the 50's or 60's.
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