Product details table:

Physical and chemical properties:

Physical properties

Appearance:

It usually presents a silvery white metallic color, with a smooth surface and high gloss. Different surface effects can be obtained through different surface treatment processes, such as mirror polishing, brushing, etc. 304 stainless steel pipes are widely appreciated for their aesthetic appeal and corrosion resistance.

Density:

The density is generally about 7.93g/cm³. For example, the density of 304 stainless steel pipe is approximately 7.93g/cm³, which is slightly higher than ordinary carbon steel.

Melting point:

The melting point is relatively high, generally around 1400-1450℃. This makes it highly stable in high-temperature environments.

Coefficient of thermal expansion:

The coefficient of thermal expansion is relatively small. In the range of room temperature to 100℃, the coefficient of thermal expansion of 304 stainless steel is about 17.2×10⁻⁶/℃. This feature enables it to maintain good dimensional stability in environments with significant temperature changes.

Thermal conductivity:

The thermal conductivity is poor, and its thermal conductivity coefficient is about 16 – 27W/(m・K), which is much lower than that of copper, aluminum, and other metals, giving it certain thermal insulation properties.

Electrical conductivity:

It has certain electrical conductivity, but the conductivity is relatively low. The conductivity of 304 stainless steel is about 1.4×10⁶ S/m, which is only about 4% of the conductivity of copper.

Chemical properties

Corrosion resistance:

This is one of the most important chemical properties of 304 stainless steel pipes. A dense passivation film forms on its surface, preventing oxygen, water, and other corrosive agents from contacting the metal matrix, thereby effectively preventing corrosion. For example, 304 stainless steel exhibits excellent corrosion resistance in environments such as the atmosphere, water, and weak acids and alkalis. It is also resistant to chloride ion corrosion, making it suitable for marine environments or chemical applications exposed to chloride ions.

Antioxidation:

304 stainless steel pipes have good oxidation resistance at both room temperature and higher temperatures. For example, they can withstand high temperatures without being easily oxidized and are often used in high-temperature applications such as heat exchangers and furnace components.

Chemical stability:

In general chemical media, 304 stainless steel pipes exhibit high chemical stability and do not easily react chemically with common chemicals. However, in some specific strong corrosive media, such as concentrated nitric acid or hydrofluoric acid, their corrosion resistance may be affected.

Passivation:

After exposure to air or undergoing passivation treatment, a passivation film forms on the surface of 304 stainless steel pipes. This passivation film enhances corrosion resistance and oxidation resistance. Passivation treatment typically involves immersing the stainless steel pipe in a solution containing an oxidant, such as nitric acid or potassium dichromate, to promote the formation and repair of the passivation film.

Application:

304 stainless steel pipes are widely used in many fields due to their excellent corrosion resistance, high strength, and good processing performance. In the medical field, they are used to manufacture equipment such as surgical instruments and implants, ensuring sterility and biocompatibility. In the building and decoration industry, they are often used for railings, handrails, and artistic designs, combining beauty with durability. In mechanical manufacturing, they are processed into key components such as shafts and gears to ensure stable operation of equipment. In the food processing industry, they are used to make food machinery and containers to meet strict hygiene standards. Additionally, in chemical equipment, electronic appliances, and other fields, 304 stainless steel pipes are indispensable. They are used to manufacture reactors, valves, electronic equipment housings, and more, adapting well to complex working environments.