For any process that engaged with changes of chemical properties and physical is a heat treatment process by cooling or heating a metal. The technique for heat treatment includes, case hardening, annealing, tempering and precipitation strengthening, quenching and tempering. The mechanical properties like hardness, toughness and ductility can be altered by intense heat treating on steel to produce different mechanical properties. This matters with the carbon content in low carbon steel such as mild steel with above 0.4% carbon, in Medium carbon steel with above 0.8% carbon, and in High Carbon Steel with up to 2% carbon content in steels. To change the characteristics of metals and alloys is by heat treatment process where by altering the diffusion and cooling rate within its microstructure to make them suitable for any kind of usage by changing the grain size at different phases and changing the molecular arrangement.

For heat treatment process on metal that are engaging with the physical and mechanical properties changes such as cooling and heating. The techniques for heat treatment including case hardening, annealing, tempering and precipitation strengthening, quenching and tempering. The mechanical properties like hardness, toughness and ductility can be altered by intense heat treating on steel and cooled it using different methods to produce different mechanical properties. This matters with the low carbon content in low carbon steel such as mildsteel behaviours after the heat treating depending on the thickness of the steel. To change the characteristics of steels is by heat treating whereby altering the diffusion and cooling rate within its microstructure by changing the grain size at different phases and changing the molecular arrangement. The mechanical properties of the steel with different thickness may be different due to the microstructure behaviour after heating and rapid cooling process. Finally, the behaviour of the microstructure of low carbon steel changes with different thickness that is affecting the mechanical properties after heating and quenching process.