Q390 seamless steel pipe

Q390 Seamless Steel Pipe

Product Overview:
Q390 seamless steel pipe is a high-strength, low-alloy structural steel pipe produced under the Chinese GB/T 1591 standard. With a nominal yield strength of 390 MPa, Q390 provides excellent mechanical properties including good toughness, weldability, and durability. It is designed to withstand heavy loads and demanding environmental conditions, making it suitable for structural, mechanical, and pressure-bearing applications.

Mechanical Properties:
Q390 steel pipes deliver a balance of high strength and good elongation, ensuring resistance to deformation under load. The pipes maintain reliable toughness and have good crack resistance, supporting their use in various structural and engineering projects. Additionally, the low alloy content enhances weldability, allowing for easier fabrication and installation.

Manufacturing and Sizes:
These pipes are manufactured using seamless processes such as hot rolling or hot expansion, resulting in uniform thickness and smooth surfaces. They are offered in a variety of diameters, wall thicknesses, and lengths, customizable to meet project-specific requirements. Pipes can be supplied in normalized or thermomechanically treated conditions according to application needs.

Advantages:
Q390 seamless steel pipes are favored for their strength-to-weight ratio, excellent mechanical performance, and structural reliability. Their toughness and weldability make them ideal for projects that require both strength and fabrication flexibility. Consistent quality control ensures dimensional accuracy and defect-free surfaces.

Applications:
Q390 pipes are widely used in construction of bridges, towers, cranes, heavy machinery, pressure vessels, and pipelines where strength and durability are critical. They are also common in manufacturing structural components that must endure dynamic stresses and challenging operating environments.

Quality Assurance:
Strict quality controls are applied during production, including ultrasonic testing, hydrostatic testing, and mechanical property verification. Mill test certificates are provided with all shipments, and third-party inspections can be arranged for added assurance. Additional testing such as impact toughness and Z-direction performance is available to meet specialized requirements.