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304 Stainless steel pipe
304 Stainless steel pipe is an austenitic stainless steel pipe containing 18% chromium and 8% nickel. It forms a dense passivation film on the surface and has excellent corrosion resistance and oxidation resistance. It has high strength, is non-magnetic, and can withstand temperatures from -196℃ to 800℃. It is formed by cold/hot rolling process and has various specifications. It is widely used in architectural decoration, food and medical, chemical machinery and other fields. It is a commonly used metal pipe in industrial and civil fields.
Category: 304 Stainless steel pipe
Key word: 304 Stainless steel pipe
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Product details table:
Physical and chemical properties:
Physical properties
Appearance:
Usually silver-gray with metallic luster, the surface can present different finishes according to processing requirements, such as mirror, matte, etc.
Density: About 7.93g/cm³, the relative density is relatively large, which makes 304 stainless steel tube have a certain weight and texture.
Density: About 7.93g/cm³, the relative density is relatively large, which makes 304 stainless steel tube have a certain weight and texture.
Melting point:
The melting point is between 1398-1454℃, with a high melting point, and can maintain good stability under high temperature environment.
Coefficient of thermal expansion: The average linear expansion coefficient is about 17.3×10⁻⁶/℃ (in the range of 20-100℃), and its size will expand or shrink to a certain extent as the temperature changes.
Coefficient of thermal expansion: The average linear expansion coefficient is about 17.3×10⁻⁶/℃ (in the range of 20-100℃), and its size will expand or shrink to a certain extent as the temperature changes.
Thermal conductivity:
The thermal conductivity is relatively low, about 16.2W/(m・K) (at 20℃), and its thermal conductivity is poor compared with carbon steel, which makes it have certain application advantages in some occasions where insulation or controlled heat transfer is required.
Conductivity: It has a certain conductivity, but not as good as copper, aluminum and other metals. Its conductivity is about 20% of copper.
Conductivity: It has a certain conductivity, but not as good as copper, aluminum and other metals. Its conductivity is about 20% of copper.
Chemical properties
Corrosion resistance:
This is one of the most important chemical properties of 304 stainless steel pipes. It contains about 18% chromium (Cr) and about 8% nickel (Ni), which can form a dense passivation film on the surface. This passivation film can prevent oxygen, water and other corrosive media from contacting the metal matrix, thereby greatly improving its corrosion resistance. In the atmospheric environment, water and some weak acid and alkali solutions, 304 stainless steel pipes have good corrosion resistance and are not easy to rust and corrode.
Oxidation resistance:
At room temperature, 304 stainless steel pipes have good oxidation resistance. In a high temperature environment, when the passivation film on the surface is damaged, the chromium element will react with oxygen first, regenerate the passivation film, continue to protect the metal matrix, and make it have a certain high temperature oxidation resistance. Generally speaking, at a temperature below 870℃, 304 stainless steel pipes can maintain good oxidation resistance.
Chemical stability:
304 stainless steel pipes show good stability in most common chemical substances. It is not easy to react chemically with general acids, alkalis, and salts, but under certain conditions, such as high concentrations of strong acids, strong alkalis, or strong oxidizing media, its corrosion resistance may be affected. For example, in strong oxidizing acids such as concentrated sulfuric acid and concentrated nitric acid, 304 stainless steel pipes may corrode, but in environments such as dilute sulfuric acid and dilute nitric acid, it has good corrosion resistance.
Application:
304 stainless steel pipes are widely used in multiple fields due to their excellent corrosion resistance, strength and hygienic characteristics. In architectural decoration, they are often used to make railings, handrails and curtain wall frames, which are both beautiful and can resist wind and rain erosion. In the food and beverage industry, they are used to manufacture processing equipment, conveying pipelines and storage tanks to meet hygienic standards and prevent food contamination. In the medical field, due to being clean, non-toxic and easy to disinfect, they are used in pharmaceutical equipment and medical gas pipelines. In mechanical manufacturing, as hydraulic and pneumatic pipelines and mechanical structural parts, they ensure the stable operation of equipment. In addition, in the fields of water treatment and environmental protection, they are used to transport corrosive liquids and install purification equipment to effectively extend service life.
