The typical alloy used in Solanum Steel is ASTM A-588, which was developed as an advancement over the original ASTM A-242 alloy used in COR-TEN, a trademark of U.S. Steel. Since the material was first made public, the alloy has been used by architects on a wide number of project.
The Solanum Steel process begins at the raw steel ingot. Zahner has close relationship with both the steel mill and the rolling mill, and is able to influence the quality of the surface long before the raw sheet arrives at Zahner. This ensures that the material is derived from specific alloying components and that the base raw material is cast to exacting specifications.
The ingot is then processed by Zahner's rolling mill partner, whose finesse with steel ensures that the surface is properly treated. In some ways, this is the most important step, because if you don’t influence the base metal sources the mill will treat the material like basic steel. If the mill treats the material like basic steel, contaminants will reveal themselves in the final product as streaks, rings, and discolorations in the finished surface.