Stainless steel is primarily when corrosion or oxidation are a problem. The function that
they perform cannot be duplicated by other materials for their cost. Over 50 years ago, it
was discovered that a minimum of 12% chromium would impart corrosion and oxidation
resistance to steel. Hence the definition “Stainless Steels”, are those ferrous alloys that
contain a minimum of 12% chromium for corrosion resistance. This development was the
start of a family of alloys which has enabled the advancement and growth of chemical
processing and power generating systems upon which our technological society is based.
Subsequently several important sub-categories of stainless steels have been developed.

A Brief Overview of Stainless Steel

Stainless steel is primarily when corrosion or oxidation are a problem. The function that
they perform cannot be duplicated by other materials for their cost. Over 50 years ago, it
was discovered that a minimum of 12% chromium would impart corrosion and oxidation
resistance to steel. Hence the definition “Stainless Steels”, are those ferrous alloys that
contain a minimum of 12% chromium for corrosion resistance. This development was the
start of a family of alloys which has enabled the advancement and growth of chemical
processing and power generating systems upon which our technological society is based.
Subsequently several important sub-categories of stainless steels have been developed.
The sub-categories are austenitic, martensitic, ferritic, duplex, precipitation hardening and
super alloys.

Austenitic Grades

Austenitic grades are those alloys which are commonly in use for stainless applications.
The austenitic grades are not magnetic. The most common austenitic alloys are ironchromium-
nickel steels and are widely known as the 300 series. The austenitic stainless
steels, because of their high chromium and nickel content, are the most corrosion resistant
of the stainless group providing unusually fine mechanical properties. They cannot be
hardened by heat treatment, but can be hardened significantly by cold-working.

Sumber : Mio.Net