Stainless steel is always associated with the name of a steel expert in England is Mr. Harry Brearley. In 1913, he worked hard to create a special series of high abrasion resistant steels, by cutting down the carbon content and adding chromium to the steel composition (0.24% C and 12.8). % Cr).
History of over 100 years of birth and development
German steel company Krupp continues to study the improvement of this steel by adding nickel to steel to increase its resistance to acid corrosion and soften it for easy processing. Based on these two inventions, two types of steel grades 400 and 300 were born just before the first world war. After the war, in the 20s of the twentieth century, a British steel expert Mr.W.Hatfield continued to research and develop ideas about stainless steel. By combining the ratio of 8% Ni and 18% Cr, it is the familiar 304 steel grade today. He also invented the 321 steel by adding titanium to the above-mentioned 18/8 ratio.
After nearly a century of establishment and development, today stainless steel has been widely used in all fields of civil and industrial with more than 100 steel grades and many different categories.
In metallurgy, the term stainless steel (stainless steel) is used to refer to a form of iron alloy containing at least 10.5% chromium. The name is “stainless steel” but it is actually just an alloy of iron that does not stain or corrode easily like other common steels. This material may also be called corrosion-resistant steel. Typically, there are different ways to apply stainless steel to different surfaces to increase the life of an item. In life, they appear everywhere as cutting blades or watch bands …
Variety of stainless steel varies based on chemical composition ratio
Stainless steel is very resistant to oxidation and corrosion, but choosing the right type and their specifications to fit into each specific case is a very important factor.
The ability to resist oxidation from ambient air at the normal temperature of stainless steel is due to the chromium ratio in the alloy (as low as 13% and up to 26% in the case of working. in harsh environments). The oxidized state of chromium is usually chromium oxide (III). When the chromium in the steel alloy comes into contact with air, a very thin layer of chromium III oxide appears on the surface of the material; This layer is so thin that it is invisible to the naked eye, which means that the metal surface is still shiny. However, they do not work at all with water and air, so they protect the steel below. This phenomenon is called rust by material engineering. This phenomenon can be seen for some other metals such as aluminum and zinc.
When stainless steel objects are joined together with forces such as bolts and rivets, their oxide layer can be lost at the positions where they are connected. When you disassemble them, you can see that those locations are corroded.
Nickel, as well as the black lip and vanadium tissues, have similar anti-oxidant properties but are not widely used. In addition to chromium, nickel as well as black lipids and nitrogen also have similar anti-oxidation properties.
Nickel (Ni) is a common ingredient to enhance the ductility, ductility and shaping properties of stainless steel. Lip-black (Mo) makes stainless steel highly resistant to corrosion in acidic environments. Nitrogen (N) creates stability for stainless steel at negative temperatures (cold environment).
Different involvement of chromium, nickel, lipid, and nitrogen components leads to different crystal structures creating different mechanical and mechanical properties of stainless steel.
Milestones marking the birth of stainless steel (stainless steel):
1912: British metallurgist Harry Brearley invents stainless steel when looking for an alloy that protects wear-resistant gun holes. Stainless steel was produced commercially in August 1913
1815: During World War I, stainless steel was used to make aircraft engines.
1919-1923: Sheffield begins producing regular knives, stainless steel scissors; tools and knives, stainless steel scissors for surgery.
1924: The first stainless steel roof appears in the United States.
1928: The first beer industry with stainless steel fermentation tanks is established.
1929: The first stainless steel milk truck to transport 3,000 gallons of milk.
1929-1930: The seven dome tops of the Chrysler building are made of stainless steel. This New York City landmark is recognized as one of the tallest buildings in the world.
1931: Stainless steel railroad cars appear in the United States. As with Rolls Royce cars, the grille and reliefs are made of stainless steel.
1933: Introduction of kitchen sinks and stainless steel household utensils.
1950: Stainless steel car parts used extensively.
1954: Manufacture of stainless steel underwater camcorders.
1963: Manufacture of the first stainless steel blades.
1969: The first man to the moon by Apollo spacecraft is propelled by a Saturn V rocket made of stainless steel.
Products made from stainless steel are increasingly playing an important role in today’s life, hoping the information contained in the article about the formation process, some basic characteristics of stainless steel and important milestones. important in the development process can help you better understand stainless steel.
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