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Stainless steel coil
Stainless steel coils are coils made of stainless steel as raw material. They contain alloy elements such as chromium and nickel. A dense oxide film is formed on the surface, giving it excellent corrosion resistance and oxidation resistance. According to the material, they are divided into categories such as austenite and ferrite. They are formed by cold rolling or hot rolling and have different surface treatment effects. Widely used in fields such as architectural decoration, home appliance manufacturing, food and medicine, it is an important metal material with both practical and aesthetic value.
Category: Stainless steel coil
Key word: Stainless steel coil
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Product details table:
Physical properties and chemical properties:
Physical properties
Appearance:
Usually has a metallic luster and a smooth surface. The appearance will vary depending on the different surface treatment processes, such as 2B surface, BA surface, frosted surface, mirror surface, etc.
Density:
It varies slightly due to the specific composition of stainless steel, generally between 7.93-8.03 g/cm3, for example, the density of 304 stainless steel is about 7.93 g/cm3, and the density of 316 stainless steel is about 7.98 g/cm3.
Melting point: The melting point of stainless steel coils is relatively high, generally around 1398-1454℃, and the melting points of different types of stainless steel will vary.
Coefficient of thermal expansion:
In the range of room temperature to 100℃, the average linear expansion coefficient is about 16.0-18.5×10⁻⁶/℃, and the thermal expansion coefficient will increase slightly with the increase of temperature.
Thermal conductivity:
The thermal conductivity is relatively poor, and its thermal conductivity is between 16.3 and 21.5 W/(m·K), which is only about 1/3 of carbon steel.
Electrical conductivity:
It has a certain electrical conductivity, but not as good as copper, aluminum and other metals. Its electrical conductivity is about 20% – 30% of copper.
Chemical properties
Corrosion resistance:
This is one of the most important chemical properties of stainless steel coils. Because it contains a high chromium (Cr) element, it is easy to form a dense chromium oxide film on the surface in the air. This oxide film can prevent the internal metal from further contacting with air, water and other corrosive media, thus having good corrosion resistance. When the chromium content reaches more than 12%, the corrosion resistance of stainless steel will be significantly improved. Some special stainless steel coils, such as 316 stainless steel, have better resistance to chloride ion corrosion due to the addition of molybdenum (Mo) elements, and are suitable for some more severe corrosive environments, such as marine environments.
Antioxidation:
At room temperature, stainless steel coils have good oxidation resistance. In high temperature environments, the oxide film on the surface of stainless steel can also play a certain protective role, preventing the metal from being further oxidized. However, as the temperature rises, the anti-oxidation performance will change, and different types of stainless steel have different anti-oxidation capabilities at high temperatures. For example, the oxide scale of 304 stainless steel below 870°C has good protection, but at higher temperatures, the oxidation rate will accelerate.
Chemical stability:
Stainless steel coils have good stability in general chemical media and are not easy to react chemically with acids, alkalis, salts, etc. However, under some specific conditions, such as high-concentration strong acid and strong alkali environments, or in the presence of specific catalysts, stainless steel may also corrode or other chemical reactions. For example, in concentrated sulfuric acid, stainless steel may be passivated, but if the sulfuric acid concentration and temperature exceed a certain range, it will also corrode stainless steel.
Magnetism:
Some stainless steel coils are magnetic, such as ferritic stainless steel and martensitic stainless steel, while austenitic stainless steel is usually non-magnetic or weakly magnetic. However, during cold processing, austenitic stainless steel may produce a certain degree of magnetism.
Application:
Stainless steel coils are widely used in multiple fields due to their characteristics such as corrosion resistance, high strength, and beautiful surface. In the field of architectural decoration, they are used to make curtain walls, elevator cars, and metal ceilings, which not only enhance the texture of the building’s appearance but also resist wind and rain erosion. In home appliance manufacturing, stainless steel coils are commonly used in parts such as refrigerator panels, washing machine inner drums, and air conditioner casings, which not only meet hygiene requirements but also enhance durability. In the food and pharmaceutical industries, because they are clean, non-toxic, and easy to disinfect, they are used to make storage tanks, conveying equipment, and pharmaceutical pipelines. In the field of transportation, they are applied to automobile exhaust systems and subway car interiors to achieve a balance between lightweight and corrosion resistance. In addition, they are also used in the manufacturing of chemical equipment, such as reactor linings and conveying pipelines, which can withstand chemical media such as acids and alkalis and ensure production safety.
