Product details table:

Physical and Chemical Properties:

Physical Properties

Appearance:

It typically appears as a dark gray metallic color with a matte or slightly glossy surface depending on the finishing process. The surface can be treated with processes such as galvanizing, painting, or oiling to enhance corrosion resistance and aesthetic appeal.

Density:

The density of Q235B carbon steel is approximately 7.85g/cm³, which is consistent with most carbon steels. This makes it slightly denser compared to stainless steel but lighter than high-alloy steels.

Melting Point:

The melting point of Q235B carbon steel is relatively high, generally around 1480-1520℃. This enables it to maintain structural integrity in high-temperature environments, although prolonged exposure to extreme heat may affect its mechanical properties.

Coefficient of Thermal Expansion:

The coefficient of thermal expansion for Q235B carbon steel is moderate, approximately 11.7×10⁻⁶/℃ in the range of room temperature to 100℃. This characteristic ensures dimensional stability under varying temperature conditions.

Thermal Conductivity:

Q235B carbon steel exhibits good thermal conductivity, with a thermal conductivity coefficient of about 50-60W/(m·K). This is significantly higher than stainless steel, making it suitable for applications requiring efficient heat transfer.

Electrical Conductivity:

It has moderate electrical conductivity, but like most carbon steels, it is not primarily used for electrical applications. The conductivity of Q235B carbon steel is lower than that of copper or aluminum, making it unsuitable for high-conductivity requirements.

Chemical Properties

Corrosion Resistance:

Q235B carbon steel has limited corrosion resistance compared to stainless steel. It is prone to rusting when exposed to moisture or corrosive environments. However, surface treatments such as galvanizing, painting, or coating can significantly enhance its resistance to corrosion. For example, galvanized Q235B steel is widely used in outdoor applications due to its improved durability.

Oxidation Resistance:

At room temperature, Q235B carbon steel exhibits moderate oxidation resistance. However, at elevated temperatures, it is susceptible to oxidation, which can lead to scaling and reduced mechanical strength. Protective coatings or alloying elements are often used to improve its performance in high-temperature environments.

Chemical Stability:

In general chemical media, Q235B carbon steel has moderate chemical stability. It reacts with strong acids such as hydrochloric acid and sulfuric acid, leading to corrosion. However, it performs well in neutral or mildly alkaline environments, making it suitable for structural and industrial applications.

Passivation:

Unlike stainless steel, Q235B carbon steel does not naturally form a passivation layer. Surface treatments such as galvanizing or applying protective coatings are essential to prevent oxidation and corrosion. These treatments create a barrier between the steel and the environment, enhancing its lifespan.

Application:

Q235B carbon steel coils are widely used in various industries due to their excellent mechanical properties, affordability, and ease of processing. In construction, they are commonly used for structural frameworks, beams, and reinforcement bars due to their high strength and durability. In manufacturing, they are processed into components such as automotive parts, machinery frames, and pipelines. In the energy sector, they are used to fabricate storage tanks, pressure vessels, and structural supports. Additionally, in the transportation industry, Q235B carbon steel coils are indispensable for producing vehicle frames, trailers, and shipping containers. With appropriate surface treatments, they can also be used in harsh environments, such as marine structures and chemical plants.