exported more than 30000 pcs to USA, Germany, Asia, South
America, Mid east without complain.
4.we test your crankshaft but hardness
less than HRC 40, why?
For iron casting crankshaft, we use
Nitriding heat treatment. It is not suitable by normal hardness
test ( Rockwell hardness). It should test by micro-sclerometer
( Vickers hardness test). please see figure
After you get the V-hardness, please
convert it according to the table