Stainless steel attached bearing the names of expert British steel industry is Harry Brearley. when in 1913, he invented the first special steel samples owns high abrasion resistance, by reducing the carbon content down and for chromium in the steel components (0.24% to 12.8% C and Cr).
After refrain steel company Krupp in Germany congDay continue to improve the steel by adding nickel to steel elements to improve corrosion resistance to acids and easy processing softer. Based on this discovery the two material that the two lines 400 and 300 steel grade brand building just before World War First. After the war, 20 years of the 20th century, a British steel industry experts as Mr. W. H Hatfield continued research growth ideas ko stainless steel. By harmonizing the different ratio between nickel and chromium in the steel sectors, he has established a new 1 a stainless steel 18/8, who 8% Ni and 18% Cr, is the familiar steel grade 304 under now. He is also the inventor of the steel 321 by way of the additional components into the steel titan, who owns 18/8 mentioned above.
1 century about to undergo branding and growth, not stainless steel has now consumed more in all areas of civil and industrial property over 100 different steel grades.
In the field of metallurgy, the term stainless steel coil (stainless steel) is used to refer to a form of iron alloys containing a minimum of 10.5% chromium. The name “Stainless Steel” but in fact it is only iron alloys are not discolored or corroded handy as conventional steels. This material is also to be called corrosion-resistant steel. routine, widespread ownership of different ways to apply stainless steel for different surfaces to improve the life of the equipment. In life, they appear everywhere as the blades cut or strap watches …
Stainless steel bearing no oxidation resistance and corrosion is very high, not only that the selection of the right type and their scientific parameters to appropriate to each particular case is very important.
Resistant to oxidation in air gap adjacent to the temperature of the steel does not rust everyday thanks to ownership percentage in the alloy chromium bearing (as low as 13% and to be up to 26% in the case making in environments where making harsh). the current state of the chromium is oxidised chromium oxide usually (III). the chromium in the steel alloy contact bearing air, chromium III oxide is one very thin layer appears on the surface of the material; This thin layer that can not see with the naked eye, ie market brought the metal surface is still shiny. in addition, they absolutely owned the effects of water and air protection should be below grade steel. This phenomenon is called oxidation technology stainless materials. bring can see this phenomenon for some other metals such as aluminum and zinc in.
while objects made of stainless steel were coordinated with each other to bring the force as bolts and rivets, the oxide layer of them flew away immediately be brought in the position that we have each other Links. leave them out, the unloading time to see the position behind schedule corrosion.
Nickel as well as lip-black modules and vanadium also feature stainless Such oxidation but is not widely used.
besides chromium, nickel and lip-black modules and nitrogen also possesses anti-rust features such oxidation.
Nickel (Ni) is a common ingredient to enhance ductility, ductile, shaping properties of stainless steel. Lip-black module (Mo) do not rust steel possesses high corrosion resistance in acidic environments. Nitrogen (N) create stability for stainless steel at a temperature not negative (cold environment).
Attended several of the components of chromium, nickel, lip-black module, nitrogen lead to different crystal structures generate different physical properties of stainless steel ko.