Q:What is the difference between Q235b seamless steel pipe and Q235d seamless steel pipe?

The core distinction between Q345B and Q345D seamless steel pipes lies in Q345D's superior low-temperature impact toughness at -20°C, achieved through stricter composition control and heat treatment processes. This makes it suitable for critical engineering projects in cold environments, whereas Q345B is primarily used in ambient temperature scenarios. Their differing performance characteristics result in distinct pricing and application boundaries.

Time：19/12/2025 17:04:10