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Occasionally, the designer will encounter special situations, and consider the special grades of the Ductile Iron alloys. MARTENSITIC DUCTILE IRON (Q&T) In the "as-cast" condition the alloy is hard and brittle, and seldom used. However, TEMPERED MARTENSITE has very high strength and wear resistance. A 930°F (500°C) tempering results in 300 HB, a 1110°F (600°C) tempering in 250 HB hardness. AUSTENITIC DUCTILE IRON They are never chosen for strength alone. The outstanding features are good corrosion and oxidation resistance, magnetic properties, strength and dimensional stability at elevated temperatures. (Also known as Ductile Ni-Resist). |
AUSTEMPERED DUCTILE IRON (ADI) This is the most recent addition to the Ductile Iron family and represents a new group of Ductile Irons offering the design engineer a remarkable combination of strength, toughness and wear resistance. ADI is almost twice as strong as the regular ASTM grades of Ductile Iron whilst still retaining high elongation and toughness characteristics. In addition, ADI offers exceptional wear resistance and fatigue strength, thus enabling designers to reduce component weight and costs for equivalent or improved performance.
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