Hebei Huayang Steel Pipe Co., Ltd is one of the leading manufacturers and suppliers of erw steel pipes for tunnel engineering dn400 in China. Please feel free to buy cheap erw steel pipes for tunnel engineering dn400 from our factory. All customized products are with high quality and low price.
Specifications, Features, and Manufacturing Control
DN400 ERW steel pipe is a commonly used medium-to-large diameter pipe specification in tunnel engineering, requiring high precision in dimensions and weld quality. Huayang Steel Pipe utilizes a mature high-frequency resistance welding process, ensuring stable control of pipe diameter and wall thickness. The weld seams undergo multiple online inspections, including ultrasonic and hydrostatic testing, to guarantee that the pipe body's roundness, straightness, and load-bearing capacity meet the requirements of tunnel construction. This specification balances strength with ease of installation and welding efficiency, making it suitable for the continuous operation demands of tunnel projects.
Advantages in Tunnel Engineering Applications
In municipal tunnels, utility tunnels, and transportation tunnel support projects, DN400 ERW steel pipes are commonly used in drainage, ventilation, fire protection, and cable protection systems. Its high structural strength and overall integrity allow it to adapt to the complex stress and humid environment within tunnels. Combined with internal and external anti-corrosion treatment, it effectively extends service life and reduces future maintenance costs, making it a practical pipe choice that balances safety and economy in tunnel engineering.
Our Certificate
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