Low-temperature resistance Q355DE seamless square tube's ultimate stress challenges and application prospects. The low-temperature resistance Q345DE seamless square tube is a high-strength, seamless processed square steel tube, widely used in various fields. Below is a detailed introduction to its material properties, specifications, and appearance features: The forging parts of low-temperature service seamless square tubes are generally divided into four temperature levels: -0 to 40°C, -50 to 80°C, -100 to 110°C, and -196 to 269°C.