In the production of ductile iron pipes of ductile cast
iron pipe with flexion and extension such castings by the slow cooling section of thick liquid metal solidification time is long, the casting shrinkage of the easily occurred.
Therefore from the difficulty of the material basically has the following several aspects: 1.
Castings to be designated area X-ray detector, how to solve the internal shrinkage of casting;
How to guarantee under the as-cast ferritic matrix by more than 90%;
How to make materials have enough tensile strength and yield strength;
How to get enough elongation (>
After the alloying, get drawn elongation;
Adopting the optimum alloying process;
Produces ferrite nodular cast iron
, in order to obtain higher tensile strength, yield strength and elongation, past all must carry on the ferritic heat treatment, heat treatment temperature is based on the existence of free cementite in the as-cast organization or pearlite, and the 900 -
950 ℃ high temperature heat treatment.
Complicated but produces high capital, technology, production cycle is long, bring to produce tissue and delivery time very big problem, which requires the necessary under as-cast ferritic matrix.
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