At Fengye Steel Tube Factory, we provide detailed information about the Q345B seamless steel pipe. This type of steel pipe is a commonly used material in various industrial applications. The "Q" in Q345 stands for the yield strength of the steel, while the number "345" indicates the minimum yield strength in megapascals (MPa). However, it's important to note that as the thickness of the material increases, the actual yield strength may decrease slightly. The different grades of Q345 steel—such as Q345A, Q345B, Q345C, Q345D, and Q345E—mainly differ in their impact toughness at various temperatures. For instance, Q345A does not have an impact test requirement, whereas Q345B is tested at normal room temperature (20°C), Q345C at 0°C, Q345D at -20°C, and Q345E at -40°C. Each grade is designed to meet specific performance standards depending on the environmental conditions it will be exposed to. The weight of a Q345B seamless steel pipe can be calculated using the formula: [(Outer Diameter - Wall Thickness) × Wall Thickness] × 0.02466 = weight per meter in kilograms. This formula helps engineers and buyers estimate the weight of the pipe for transportation or structural design purposes. In terms of chemical composition, Q345B steel typically contains the following elements: Carbon (C) between 0.12% and 0.20%, Silicon (Si) between 0.20% and 0.60%, Manganese (Mn) between 1.00% and 1.60%, Phosphorus (P) no more than 0.040%, Sulfur (S) no more than 0.040%, and small amounts of other alloying elements like Nickel (Ni), Chromium (Cr), Copper (Cu), Vanadium (V), and Niobium (Nb). This information is sourced from reliable industry references and provides a comprehensive overview of the properties and applications of Q345B seamless steel pipes. Whether you're looking for structural support, hydraulic systems, or mechanical components, understanding these specifications can help you make informed decisions. Dry Oven,Laboratory Oven,Binder Oven,Vacuum Drying Oven Zenith Lab (Jiangsu) Co.,Ltd , https://www.zenithlabo.com