Q345B, Q345E, and Q345D Carbon Seamless Steel Pipes:
Product Description: Q345B, Q345E, and Q345D Carbon Seamless Steel Pipes are high-strength carbon steel tubes engineered for structural applications and high-pressure environments. These pipes are manufactured to strict quality control standards and are characterized by their seamless design, which provides superior pressure resistance and structural integrity. The 'Q345' designation indicates the minimum yield strength of 345 MPa, with the 'B', 'E', and 'D' signifying different levels of impact testing requirements and suitability for different service temperatures.
Product Parameter Specifications:
Parameter | Specification | Units |
Standard | GB/T 8162, GB/T 8163, EN 10305, ASTM A106/A53, etc. | - |
Grade | Q345B, Q345E, Q345D | - |
Outer Diameter | Typically 20mm to 630mm, depending on the specific application | mm |
Wall Thickness | Varies with diameter and pressure requirements | mm |
Length | Standard lengths available; custom lengths upon request | m |
Tolerance | As per relevant standards for diameter and wall thickness | - |
Product Applications:
- Structural Applications: Utilized as structural support in construction and engineering projects.
- Pressure Vessels: Suitable for the construction of high-pressure vessels and boilers.
- Mechanical Equipment: Employed in the manufacturing of heavy machinery and equipment.
- Oil and Gas Industry: Used for transporting oil, natural gas, and petroleum products.
- Petrochemical Industry: Ideal for applications involving high pressures and temperatures.
Types of Q345 Carbon Seamless Steel Pipes:
- Q345B: Suitable for general low-temperature applications with a focus on structural integrity.
- Q345E: Designed for low-temperature service with enhanced impact resistance.
- Q345D: Offers improved performance at higher temperatures compared to Q345B.
Mechanical Properties:
Property | Typical Range/Value for Q345B, Q345E, Q345D | Units |
Tensile Strength | 470-630 MPa | MPa |
Yield Strength | ≥ 345 MPa | MPa |
Elongation | ≥ 21% (for diameters ≤ 40mm) | % |
| ≥ 20% (for diameters > 40mm) | % |
Chemical Composition:
Element | Typical Range (%) for Q345 Grades |
Carbon (C) | 0.12-0.20 |
Manganese (Mn) | 1.00-1.60 |
Silicon (Si) | ≤ 0.50 |
Phosphorus (P) | ≤ 0.035 |
Sulfur (S) | ≤ 0.035 |


Company Profile
Factory Tour
team introduction
Applications