Product details table:

Physical and chemical properties:

Physical properties

Appearance:It usually presents a metallic gray or dark gray color, with a rough surface when untreated, but it can be polished or coated to achieve a smoother finish. Different surface treatments, such as galvanizing, painting, or blackening, can be applied to enhance its appearance and corrosion resistance.

Density:The density of carbon steel bars is generally around 7.85g/cm³, which is slightly lower than that of stainless steel. For example, the density of low-carbon steel is approximately 7.85g/cm³, while higher carbon content may slightly increase the density.

Melting point:The melting point of carbon steel is relatively high, typically ranging from 1425-1540℃ depending on the carbon content. For instance, low-carbon steel has a melting point closer to 1530℃, while high-carbon steel has a slightly lower melting point due to the increased carbon content.

Coefficient of thermal expansion:The coefficient of thermal expansion is moderate. For carbon steel, the coefficient of thermal expansion is approximately 11-12×10⁻⁶/℃ at room temperature. This property ensures relatively good dimensional stability in environments with fluctuating temperatures.

Thermal conductivity:Carbon steel has better thermal conductivity compared to stainless steel, with a thermal conductivity coefficient of approximately 45-55W/(m・K). This makes it suitable for applications requiring efficient heat transfer.

Electrical conductivity:steel has moderate electrical conductivity, which is higher than that of stainless steel. The conductivity of carbon steel is about 7×10⁶ S/m, making it more conductive than stainless steel but still significantly lower than copper.

Chemical properties

Corrosion resistance:Carbon steel has relatively poor corrosion resistance compared to stainless steel. Without protective coatings, it is prone to rusting when exposed to moisture and oxygen. Surface treatments like galvanizing, painting, or coating are often applied to improve its corrosion resistance. For example, galvanized carbon steel is widely used in outdoor applications to resist atmospheric corrosion.

Antioxidation:Carbon steel has limited oxidation resistance, especially at elevated temperatures. It tends to oxidize and form scale when exposed to high temperatures, limiting its use in extreme heat environments unless protected by coatings or alloys.

Chemical stability:In general chemical environments, carbon steel is susceptible to chemical reactions, especially in acidic or highly humid conditions. In strong corrosive media, such as acids or salts, carbon steel will corrode rapidly unless properly treated or coated.

Passivation:Unlike stainless steel, carbon steel does not naturally form a passivation film. Instead, protective measures such as galvanizing, painting, or applying anti-corrosion coatings are required to prevent rust and corrosion. These treatments create a barrier layer to isolate the steel from corrosive agents.

Application:

Carbon steel bars are widely used in various industries due to their high strength, affordability, and ease of processing. In construction, they are commonly used to manufacture structural beams, reinforcement bars, and frames. In machinery manufacturing, they are processed into components such as shafts, gears, and fasteners to ensure durability and reliability. In the automotive industry, carbon steel is used to produce chassis, axles, and other load-bearing parts. Additionally, in fields such as pipelines, tools, and industrial equipment, carbon steel bars are indispensable. They are often coated or treated to adapt to specific working environments, ensuring performance and longevity in demanding conditions.