Low temperature pipe Q345D

Q345D Low Temperature Steel Pipe

Product Overview:
Q345D low temperature pipe is a high-strength, low-alloy structural steel pipe manufactured in accordance with the Chinese standard GB/T 1591. It is specifically engineered for cold environments, offering excellent mechanical performance and impact resistance at temperatures as low as -20°C. This makes it an ideal choice for low-temperature applications in sectors such as LNG, natural gas transmission, offshore engineering, and cold-region infrastructure.

Key Characteristics:
Q345D pipes provide a reliable combination of strength, toughness, and weldability. The yield strength typically reaches 345 MPa, while the tensile strength ranges between 470 and 630 MPa. With a good elongation rate and certified impact toughness at -20°C, these pipes ensure safety and stability in harsh conditions. The steel composition is controlled for low carbon content, offering enhanced weldability and reduced risk of brittle fracture.

Available Forms and Sizes:
Q345D pipes are available in both seamless and welded forms, including ERW, LSAW, and SSAW processes. Outer diameters range from small to large sizes, with customizable wall thicknesses and lengths to meet diverse engineering needs. Pipes can be supplied hot rolled, normalized, or thermomechanically treated, depending on application requirements.

Applications:
These pipes are widely used in low-temperature pressure systems, storage tanks, structural supports for bridges and buildings in cold climates, offshore platforms, and power plant piping. Their ability to perform under subzero temperatures makes them highly suitable for projects that demand both high strength and toughness.

Quality Assurance:
All Q345D low temperature pipes undergo rigorous quality control procedures, including impact testing at -20°C, non-destructive testing (UT, RT), and dimensional inspection. Products can be accompanied by mill test certificates and third-party inspection reports from organizations such as SGS, TUV, or BV. Optional enhancements such as Z-direction testing and customized coatings are also available upon request.