I do stretch die for nodular cast iron, which can tell me the mold heat treatment method, the specific Cui fire a few degrees?
The mechanical properties of ductile iron mainly depend on the matrix structure because of the small separation of spherical graphite on matrix, so the mechanical properties of nodular cast iron can be significantly improved by heat treatment.
Graphite annealing graphitizing annealing in order to make the eutectoid cementite in as cast microstructure of free cementite and pearlite decomposition, obtain high plasticity of ferrite nodular cast iron body, eliminate casting stress, improve the processing of.
annealingThe casting stress of the stress relief cast iron is about two times greater than that of the gray iron. For ductile iron castings which are no longer subjected to other heat treatment, stress relieving annealing shall be carried out.
