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. Stainless steel channel bars are often used in structural applications where their aesthetic appeal and corrosion resistance are highly valued.

Density:

The density is generally between 7.93-8.00g/cm³. For example, the density of the commonly used 304 stainless steel channel bar is about 7.93g/cm³, and the density of the 316 stainless steel channel bar is about 7.98g/cm³, which is slightly higher than ordinary carbon steel.

Melting point:

The melting point is relatively high, generally around 1398-1454℃. For example, the melting point of 304 stainless steel is about 1400-1450℃, which makes it have good stability 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 stainless steel channel bars to maintain good dimensional stability in an environment with large 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, so it has certain thermal insulation performance.

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 stainless steel channel bars. Because a dense passivation film can be formed on its surface, this passivation film can prevent oxygen, water, etc., from contacting the metal matrix, thereby effectively preventing corrosion. For example, 304 stainless steel has good corrosion resistance in environments such as atmosphere, water, and weak acids and alkalis; 316 stainless steel contains molybdenum, which is more resistant to chloride ion corrosion and is often used in marine environments or chemical environments that are exposed to chloride ions.

Antioxidation:

Stainless steel channel bars have good oxidation resistance at both room temperature and higher temperatures. For example, 310S stainless steel channel bars can withstand high temperatures in high-temperature environments without being easily oxidized and can be used in high-temperature furnace structures and other occasions.

Chemical stability:

In general chemical media, stainless steel channel bars have high chemical stability and are not easy to react chemically with common chemicals. However, in some specific strong corrosive media, such as concentrated nitric acid, hydrofluoric acid, etc., the corrosion resistance of stainless steel channel bars may be affected.

Passivation:

After the stainless steel channel bar is in the air or after passivation treatment, a passivation film will form on the surface. This passivation film can improve the corrosion resistance and oxidation resistance of stainless steel. Passivation treatment usually involves immersing the stainless steel channel bar in a solution containing an oxidant, such as nitric acid, potassium dichromate, etc., to promote the formation and repair of the passivation film.

Application:

Stainless steel channel bars are widely used in many fields due to their excellent corrosion resistance, high strength, and good processing performance. In the field of construction, they are used to manufacture structural supports, frames, and reinforcements, ensuring durability and aesthetic appeal. In building decoration, they are often used for window frames, door frames, handrails, and artistic sculptures, combining beauty with long service life. In mechanical manufacturing, they can be used as structural components in equipment frames, machine bases, and support systems to ensure stable operation of machinery. In the food processing industry, stainless steel channel bars are used to construct equipment frames, conveyor systems, and storage racks, meeting strict hygiene standards. In addition, in the fields of chemical equipment, electronic appliances, etc., stainless steel channel bars are also indispensable. They are used to manufacture structural supports for reactors, frames for valves, and housings for electronic equipment, adapting well to complex working environments.