Process for the production of as-cast bainitic cast iron with spheroidal graphite

摘要

A casting process includes formulating a molten metal alloy with a desired chemical composition, spherodising the alloy before filling the molds and letting them cool. The molds are placed on a movable device and passed through a heating device with a residence time ≥ 5 hours. The chemical composition is 3.3 - 3.6% carbon, 2.3 - 2.6% silicon, 0.2 - 0.4% manganese, 0.8 % copper, 2- 3% nickel and 0.5 - 1.0 % molybdenum. An Independent claim is included for the following: (a) Manufacturing crankshafts as above. Preferred Features: The spheroidal treatment includes applying a mixture of silicon, iron, calcium and magnesium. The mold is made of sodium silicate sand hardened with carbon dioxide.