Metallic　materials　are　widely　used　in　automotive,　medical　equipment,　architecture,　aerospace,　and　other　fields.　However,　friction　and　wear　are　inevitable　with　the　use　of　metallic　materials.　Therefore,　it　is　important　to　study　the　friction　and　wear　mechanisms　of　these　materials　for　prolonging　their　service　life.　In　the　present　work,　microscratch　test　was　carried　out　on　sixteen　metallic　materials　with　a　Rockwell　C　120　degrees　diamond　indenter　to　investigate　the　effects　of　the　progressive　normal　force　on　the　scratch　responses　of　the　materials.　By　increasing　the　normal　force　linearly　from　5　mN　to　30　N,　both　the　penetration　and　residual　depths　increase　linearly.　The　elastic　recovery　rate　firstly　increases　rapidly,　and　then　remains　nearly　stable.　When　the　penetration　depth　is　smaller　than　the　transition　depth　of　the　indenter,　only　the　sphere　is　in　contact　with　the　material,　resulting　in　a　nonlinear　increase　in　the　residual　scratch　width;　when　the　conical　part　of　the　indenter　is　in　contact　with　the　material,　the　residual　scratch　width　increases　linearly.　The　asymptotic　elastic　recovery　rate　and　scratch　hardness　increase　linearly　with　the　yield　strength.　The　scratch　friction　coefficients　of　pure　Mo,　pure　W,　and　40Cr　always　increase　nonlinearly　with　normal　force,　and　the　scratch　friction　coefficients　of　other　metals　firstly　increase　nonlinearly　and　then　remain　nearly　stable.　The　variation　of　the　scratch　friction　coefficient　can　be　explained　by　a　geometrical　contact　model.　Adhesion　friction　and　ploughing　friction　play　almost　the　same　role　in　the　friction　mechanism　of　QT500,　and　ploughing　friction　plays　the　major　role　in　the　friction　mechanism　of　other　materials　under　large　normal　forces.　The　asymptotic　scratch　friction　coefficient　decreases　linearly　with　the　increase　of　the　asymptotic　scratch　hardness　and　the　ratio　of　asymptotic　scratch　hardness　over　the　elastic　modulus.