Different types of stainless steel

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Different types of stainless steel

Stainless steel or stainless steel is an alloy of iron containing at least 10.5% chromium. It is less colorless or corrosive than conventional steel.

Stainless steel is associated with the name of a British steel industry expert Mr. Harry Brearley. In 1913, he invented a special type of steel with high abrasion resistance, by reducing carbon content and giving chromium in the steel component (0.24% C and 12.8% Cr).

Then Krupp steelmaker in Germany continued to improve the steel by adding nickel to steel to increase its resistance to acid corrosion and soften it for easier machining.

Based on these two inventions, the two types of steel grades 400 and 300 were born just before the First World War. In the twenties of the twentieth century, British industrialist W. H Hatfield continued to research and develop ideas for stainless steel. By combining the different ratios between china and chrome, he introduced a new 18/8 stainless steel with 8% Ni and 18% Cr, which is a familiar 304 grade. of today. He also invented the 321 steel by adding the titanium component to the 18/8 steel.

Over nearly a millennium of development and development, stainless steel today has been used extensively in all civil and industrial fields with more than 100 different grades of steel.

In the metallurgy industry, the term stainless steel is used to refer to an alloy of iron containing at least 10.5% chromium. The name is "stainless steel" but it is actually an alloy of iron that is not discolored or corroded as easily as other conventional steels. This material can also be called anti-corrosion steel. Typically, there are many different ways to apply stainless steel to different surfaces to increase the life of the appliance. In life, they appear everywhere as cutting blades or watch straps.

Stainless steels are highly resistant to oxidation and corrosion, but it is important to choose the right type and specifications for their particular application.

The resistance to atmospheric oxidation at the normal temperature of stainless steel is attributable to the chromium content of the alloy (as low as 13% and up to 26% in the case of work in harsh working environment). The oxidized state of chromium is usually chromium oxide (III). When chromium in steel alloy is exposed to air, a very thin layer of chromium III oxide appears on the surface of the material; This layer is so thin that it can not be seen with the naked eye, which means that the metal surface is still shiny. However, they do not completely affect the water and the air should protect the steel layer below. This phenomenon is called anti-rust by means of material technology. This can be seen for some metals such as aluminum and zinc.

When stainless steel objects are bonded together with force acting like bolts and rivets, their oxide layer can fly away at the sites where they are bonded. When disassembled, they can be seen corroded.

Nickel as well as black and vanilla also have similar antioxidant properties but are not widely used.

In addition to chromium, nickel as well as mercury and nitrogen also have similar anti-rust properties.

Nickel (Ni) is a common component for increasing the ductility, ductility, and shaping of stainless steel.

Black Mo (Mo) makes the stainless steel highly resistant to corrosion in acidic environments. N (N) creates stability for stainless steel at cold temperatures.

The different involvement of chromium, nickel, black-lipid, nitrile components leads to different crystalline structures that give rise to different mechanical properties of stainless steel.

Stainless steels are highly resistant to oxidation and corrosion, but the choice of the right type and their specifications to suit each specific case is very important.

Currently, there are many types of stainless steel such as SUS430, SUS202, SUS201, SUS304, SUS316. These types of stainless steel are different in composition so the durability, glossiness is also different. Here are some common types of stainless steel:

* SUS430: magnetized, vulnerable to the environment of tarnishing

* SUS202: magnetized, vulnerable to the environment of tarnishing

* SUS201: non-magnetic (99%), durability with time, but avoid direct contact with acid or salt

* SUS304: Non-magnetic, can be used in any environment, always shiny, ensure food safety

* SUS316: Non-magnetic, can be used in all environments, including environments that require very strict cleanliness.

Get know stainless steel 2xx, 3xx, 4xx

As stated above, 4xx grades of martensite and ferrite stainless steels, grades 2xx and 3xx are available in the austenitic stainless steel family. In theory, the original austenite steel group was completely magnetized (but not magnetized) but, according to the above, the austenitic steel group is hardened when deformed.

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