The metal alloy made with one or more mixed elements like chromium, nickel, silicon, aluminum, carbon and molybdenum. The main use of stainless steel is in food and catering industry where many types of kitchen utensils are made that do not affect the flavor of food for long time and easy to clean property make is more hygienic. Its 100% recyclable and resistance corrosion free makes it more popular than other metals.
When pure iron is mixed with carbon steel is produce and small amount of chromium (about 10.5% is added to steel to make it resistance to rust. Pure iron rust because it heavily reacts with oxygen in the presence of water, whereas chromium reacts with oxygen in such a way that only the outer surfaces become oxidized and further oxidation is prevented. Chromium forms a lifeless coating of chromium oxide, which stops automatic and chemical damage, over steel. Chemical properties and structure of stainless steel are improved using other alloys. Titanium, vanadium and copper are the alloys which make it more suitable for specific uses, and are used only when the buyer demands the specialized type of steel.
The chemical properties of stainless steel is being improved using other metal alloys. Metals like titanium, vanadium and copper are the alloy which makes the stainless steel lustier and suitable for specific use. Nonmetals such as nitrogen, carbon and silicon are also used to make stainless steel.
There is wide range of physical properties of stainless steel makes it different from other metals. It possesses different properties because the metal contain chromium stainless steels show considerable differences between the various steel types and may also be markedly different from carbon steels.
Corrosion Resistance – the chromium contain in SS make it corrosion and resistance free, however the chromium is increased at certain level up to 25% to make is resistance free in exacting environment. The chromium in the alloy creates a shielding layer of chromium (III) oxide (Cr2O3) on the surface when it is exposed to oxygen in the environment. This layer is too thin to be visible, so the surface remains smooth and lustrous.
Acid Resistance – SS is highly resistance in acidic environment, this property depends upon the type of acid concentration, the temperature and the type of steel. Any type of stainless steel gets damaged by hydrochloric acid (HCl), and hence, the two should never be used together.
Hot Strength – Austenitic stainless steels retain high strength at elevated temperatures. Ferritic grades containing high amount of chromium, like 446, also show a high hot strength. The high chromium content also helps the stainless steel resist scaling at high temperatures.
Strength – compare to other slight metals stainless steel have higher ductile strength. The duplex stainless steel has an even higher ductile strength than the austenitic grades.
Stainless steel have wide range of physical, chemical and mechanical properties which makes it different from other metals. The material is highly used in industrial and non-industrial sector because of its different properties and uses.
Amit Singhavi is the marketing manager at astec INC. and bringing new and innovative abstract in stainless steel. He is the writer of this article and exploring his experience with us.This author has published 4 articles so far.