What is the grade of Q345 steel?
Q345 steel is a low-alloy structural steel with a minimum yield strength of 345 MPa. It has several grades (A, B, C, D, E), differing in their low-temperature impact testing performance: grade A requires no impact test, while grade E requires an impact test at -40°C.
What is the yield strength of Q345 steel?
The yield strength of Q345 steel with a thickness not exceeding 16 mm is 345 MPa. The yield strength of the steel plate decreases with increasing thickness: 325 MPa for 16-35 mm thickness, 295 MPa for 35-50 mm thickness, and 275 MPa for 50-100 mm thickness.
What is the difference between Q345 and Q345R?
The main difference lies in the fact that Q345R has stricter (lower) limits on phosphorus and sulfur content, higher requirements for minimum tensile strength and elongation, and must undergo impact toughness testing to ensure safety in high-pressure applications.
What are the advantages of Q345 steel pipe?
The advantages of Q345 steel pipe include high strength, excellent weldability, and good low-temperature performance, making it suitable for structural and heavy-duty applications.
What are the applications of Q345 steel pipe?
Q345 steel pipe is widely used in construction, energy, and manufacturing due to its high strength, good weldability, and good low-temperature performance. Application areas include building structures, bridges and pipelines, as well as pressure vessels, ships, and machinery components.
