Specific test items are as follows: metal microstructures observed on the surface unevenness of the grain size of carbide inclusions infiltration depth analysis of the microstructure of metal coating thickness detecting metal detecting fracture to observe and analyze the chemical composition of metal mechanical properties (hardness class) Material Vickers Vickers hardness of the surface hardness of the core Vickers hardness of Rockwell hardness of the metal mechanical properties (mechanics) tensile strength / yield strength / elongation bending test stretch / elastic coefficient of thrust / pull / shear / insertion force torque