Product details table:

Physical and Chemical Properties

Physical Properties

Appearance:

It usually presents a metallic gray or black color, with a smooth surface after processing. Different surface finishes can be achieved through treatments such as galvanizing, painting, or coating to enhance corrosion resistance and aesthetic appeal.

Density:

The density is approximately 7.85 g/cm³, which is typical for carbon steel materials. This makes it slightly denser than stainless steel but still lighter than many other structural metals.

Melting Point:

The melting point is relatively high, generally around 1425-1540℃. This characteristic ensures that ASTM Q335 carbon steel pipes maintain good stability in high-temperature environments, making them suitable for applications involving heat and pressure.

Coefficient of Thermal Expansion:

The coefficient of thermal expansion is moderate, approximately 11.7×10⁻⁶/℃ at room temperature. This allows the material to maintain dimensional stability even in environments with significant temperature fluctuations.

Thermal Conductivity:

The thermal conductivity is relatively high, approximately 50-60 W/(m·K), which is significantly higher than stainless steel. This makes ASTM Q335 carbon steel pipes effective for heat transfer applications.

Electrical Conductivity:

It has moderate electrical conductivity, with a resistivity of about 1.43×10⁻⁷ Ω·m. While not as conductive as copper or aluminum, it is suitable for certain electrical grounding and structural applications.

Chemical Properties

Corrosion Resistance:

ASTM Q335 carbon steel pipes have limited corrosion resistance compared to stainless steel. However, they can be protected through surface treatments like galvanizing or applying protective coatings. In untreated conditions, they are prone to rust when exposed to moisture or corrosive environments.

Oxidation Resistance:

Carbon steel has moderate oxidation resistance at room temperature. At higher temperatures, it may form scale or oxidize unless protected by coatings or used in controlled environments.

Chemical Stability:

In general chemical media, ASTM Q335 carbon steel exhibits moderate chemical stability. It is not resistant to strong acids (e.g., hydrochloric acid, sulfuric acid) or alkalis. For harsh chemical environments, additional protective measures such as coatings or linings are required.

Passivation:

Unlike stainless steel, ASTM Q335 carbon steel does not naturally form a passivation layer. Instead, it relies on external treatments such as galvanizing, painting, or epoxy coatings to provide a barrier against corrosion and improve durability.

Application:

ASTM Q335 carbon steel pipes are widely used due to their excellent mechanical properties, affordability, and versatility. In the construction industry, they are used for structural frameworks, scaffolding, and pipelines. In the oil and gas sector, they serve as transmission pipelines for non-corrosive fluids. In mechanical engineering, they are used to manufacture components such as shafts, gears, and supports. In addition, they are commonly used in water supply systems, heating systems, and industrial piping networks. Their ability to withstand high pressure and temperature makes them indispensable in various industrial applications.