Test of nodular cast iron

As cast crankshaft castings with nodular cast iron trademark of QT800-2 are selected as the samples. After testing, the nodularity grade is grade 2, the graphite size is grade 5~6, and the chemical composition is shown in Table.


Considering the test sample requirements, processing difficulties, heat treatment oxidation decarburization and other factors, it is first processed into quasi tensile samples and quasi notchless impact samples with a machining allowance of not more than 1 mm under the as cast condition, and then processed into standard tensile samples and standard impact samples after isothermal quenching of ductile iron.

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