Ductile iron pipes are how to improve the toughness of ductile cast
iron nodular cast iron annealing the ordinary grey cast iron in the process of casting chilling tendency, internal stress is bigger also, cast iron or hard to get pure ferrite pearlite matrix, in order to improve the ductility or toughness of cast iron parts, it will cast iron often heated to 900 - again
950 ℃ high temperature annealing and heat preservation time, furnace cooling to 600 ℃ after getting cold again.
Cementite decomposition of matrix in the process of the graphite, the precipitation in the austenite, graphite, graphite gathered in the original around the nodular graphite, matrix into ferrite.
If the as-cast organization by (
Ferrite + pearlite)
Matrix, and the composition of spheroidal graphite, to improve the toughness, just put the pearlite into ferrite and cementite decomposition of spheroidal graphite, so it will soon be iron heated to 700 - again
After 760 ℃ the eutectoid temperature fluctuation by holding furnace cooling to 600 ℃ from getting cold.
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