The cast steel grade is selected for its ability to provide ductility similar to that of rolled steel. The material has a specified minimum yield stress and tensile strength of 50 ksi (345 MPa) and 80 ksi (550 MPa), respectively. The ASTM specification requires the castings be produced in conjunction with a heat treatment process that includes normalizing and stress relieving. It also requires each heat of steel meet strict mechanical properties. These properties include the specified tensile and yield strengths, as well as elongation and area reduction limitations.
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