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The compositions and mechanical properties are only suggested to ensure good weldability and good formability in conjunction with control of mechanical properties. The particular design must be considered to ensure that the materials selected are compatible with the design. The indicated properties are intended to assure that the ROPS or FOPS will have meaningful resistance to brittle fracture. The impact toughness requirement is the conventional Charpy V Notch evaluation: it is primarily a quality control check and the indicated temperature does not directly relate to operating conditions. Three steel product categories are covered: hollow structural members, plates, bars and shapes, and castings.