Heat Treat

In-house Heat Treating

In-plant heat treating and black oxiding capability sets GPMI apart from our competition.

Our heat treat department includes a carburizing furnace, vacuum steel treating furnace, salt pots for high carbon steels, tempering furnace & black oxiding which allows us to closely monitor operations that are normally outsourced by other suppliers.


Black Oxidizing, performed in plant, on manufactured steel products, avoids delays normally anticipated with outsourced multiple details.