Steel is a collective name for the 0.02% iron carbon alloy to 2.11%. Given more than 2.11%, it is iron.
The chemical composition of steel can change considerably and steel only contains carbon elements is called carbon steel or ordinary steel. Steel can also add alloy elements such as chrome, nickel, manganese, silicon, titanium, molybdenum, etc. During the merger process to improve steel performance.
Stainless steel is the main characteristic of resistance to stainlessness and corrosion, and the chrome content is at least 10.5%, and the maximum carbon content does not exceed 1.2%.
01
Will stainless steel not rust? When the brown rust stains (points) appeared on the surface of stainless steel, people were surprised that stainless steel does not rust and that rust is not made of stainless steel. In fact, it is a unique misunderstanding of the lack of understanding of stainless steel. Stainless steel also rusts under certain conditions. Stainless steel has the ability to withstand unwavering atmospheric-stage-stage, and also has the ability to corrode corrosion in acid, alkali and salt, that is to say resistance to corrosion. However, its resistance to corrosion is chemically composed of its steel itself, and it changes between them, and the conditions of use and the types of environmental supports are modified. For example, 304 materials, in the dry and clean atmosphere, have excellent resistance to corrosion, but move in the seaside area, and soon rusts in sea fog containing a large amount of salt. Therefore, it is no kind of stainless steel that can resist corrosion and not rust at any time. Stainless steel is a very thin, stable and stable and stable chrome oxide film formed by its surface to prevent oxygen atoms from continuing to infiltrate and continue to oxidize, and Get the ability to resist corrosion. Once there is a reason, this film is permanently and the air or oxygen atoms in the air or the liquid will continue to penetrate or the average metal iron atoms are constantly analyzed to form an oxide loose iron.
02
What type of stainless steel is not easy to rust?
The main factors affecting stainless steel rust are the following three points.
1) The content of the alloy elements
In general, the chrome content is not easy to rust when 10.5% steel. The higher the nickel content of chrome, the better anticorrosive.
2) The manufacturer’s merger process
The manufacturers’ merger process will also affect the corrosion resistance of stainless steel. Stainless steel mills with good fusion technology, advanced equipment and advanced know-how can be guaranteed in terms of control of alloy elements, the elimination of impurities and the control temperature control of the billette . Reliable, with good interior quality and not easy to rust. Conversely, a few small steel equipment is back and back.
3) The external environment
The environment with a dry climate is not easy to rust. Air humidity, continuous rainy weather or environmental areas with great acidity in the air are easy to rust. 304 in stainless steel, if the surrounding environment is too poor, it rusts.
03
How to manage stainless steel?
1) Chemical method
Use an acid cream or spray to help its rusty pieces to reappear or a passivation to form an oxide of chrome to restore corrosion resistance. appropriate rinsing. After all the treatment, use the polishing equipment to be polished again and close it with polishing wax. For parts with slight rust spots, you can also use a fuel and oil mixture 1: 1 to wipe the rust stains with clean rags.
2) Mechanical method
Clean sandy and use glass or ceramic particles to be cleaned, destroyed, brushed and polishing. It is possible to wipe the pollution caused by the materials, the polishing materials or the materials previously destroyed. Various particles of foreign iron can become a source of corrosion, especially in a wet environment. Therefore, the mechanical cleaning surface should be regularly cleaned under dry conditions. The use of mechanical methods cannot clean its surface and cannot modify the resistance to the corrosion of the material itself. Therefore, it is recommended to remove the polishing equipment after mechanical cleaning and close it with polishing.
04
Can I judge stainless steel with magnets?
Many people buy stainless steel products or stainless steel, bring a small magnet by themselves and suck it when they look at the goods. This does not rust without magnetic.
The stainless steel belt is determined by the organizational structure. “Stainless steel is magnetic. Austenitic” stainless “steel has its complete mechanical performance and good technical performance.
Currently, stainless steel in the series and 300 of Nickel So Called containing less manganese are not magnetic, but the gap between its performance and 304, the 304 containing nickel is large. , it is therefore a misunderstanding and not scientific to judge the advantages and disadvantages of stainless steel with stainless steel straps without magnetic.
05
What are the commonly used stainless steel brands?
201: stainless steel with manganese nickel has a certain amount of acid and alkali resistance, high density, bubble -free polishing and certain shallow stretching products such as cases, decorative pipes and Industrial pipes.
202: It belongs to a stainless steel of manganese with low nickel content, with about 8% nickel and manganese. Engineering, glass handles, road installations, etc.
304: GM stainless steel has good corrosion resistance, heat resistance, low -temperature resistance and mechanical properties, strong tenacity and is used in the food industry, the medical industry, the industry, chemical industry and domestic decoration industry.
304L: Stainless steel with low carbon 304, which is used in parts of corrosion and molding equipment.
316: MO is added, high temperature resistance is very corrosive and is used in the field of sea water, chemistry, food industry and paper manufacturing.
321: There are excellent broken performance of high temperature stress and high temperature resistance.
430: Heat -resistant fatigue, thermal expansion coefficient is smaller than Astentencyl, which is used in household appliances and architectural decoration.
410: high hardness, strong tenacity, good corrosion resistance, great thermal conductivity, a small expansion coefficient, good antioxidability, are used to make parts of the atmosphere, water vapor , water and corrosion of oxidative acid.
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