The material of EQ491 engine camshaft is chromium-molybdenum alloy cast iron, and its chemical composition is shown in Table 1 .
Table 1 Chemical composition w ( % ) of chromium-molybdenum alloy cast iron

The metallographic structure of the chromium-molybdenum alloy cast iron camshaft before heating is type B graphite + fine pearlite + mesh carbide.
The cam blank is subjected to induction heating quenching in the as-cast state. The technical requirements for quenching are surface hardness of 50-60HRC , peach tip hardened layer depth of 4.6mm-10.0mm , and base circle hardened layer depth of 1.5mm-8.0mm .
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