416 Stainless Steel

Stainless Steel 416 has a machinability of 85% and it is a free-machining stainless steel. The machinability of most of the free machining stainless steels can be improved by adding Sulphur, which leads to the development of manganese sulphide inclusions. It also reduces the weld ability, formability and corrosion resistance of stainless steel 416 to below that of stainless steel 410. This steel is available in highly tempered, hardened or unhardened forms due to its high machinability and low cost. It is highly resistant to acids, alkalis, fresh water and dry air. 416 stainless steel can be hardened to obtain maximum smooth surface and corrosion resistance. It is in appropriate for chloride and marine environment due to its higher Sulphur content. Under intermittent conditions the scaling resistance can be extended up to 760°C and up to 675°C under continuous operation. Grade 416 should not be used at temperature greater than the typical tempering temperatures by considering the sustainability of mechanical properties. It can be annealed at temperature of 815 to 900°C for ½ h and the process can be followed by cooling at 30°C for an hour and air cooling.

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