STRUCTURE OF SPHEROIDAL GRAPHITE CAST IRON PART AS-CAST

摘要

PROBLEM TO BE SOLVED: To provide the structure of a spheroidal graphite cast iron part which has strength of 900 to 1,000 N/mm² as-cast, and is suitable, e.g. for automobile parts, machine parts and building parts in which lightening by the increase of strength is made possible.;SOLUTION: The spheroidal graphite cast iron part has a composition containing, by mass, 3.20 to 4.00% C, 2.00 to 3.20% Si, 0.30 to 2.50% Mn, ≤0.035% P, ≤0.12% S, 0.30 to 3.50% Cu, 0.02 to 0.08% Mg and 0.005 to 0.300% rare earth elements, and the balance Fe. The spheroidal graphite cast iron part has a metallic structure including a petaloid structure in which the spacing of the layers of pearlite is narrowed, and further, ferrite or ferrite and pearlite are involved in the circumference of graphite.;COPYRIGHT: (C)2002,JPO