What is the difference between q345a and q345b?
1 Answers
q345a and q345b mainly differ in their impact temperatures. Here are the specific details: 1. Grading: Q345A grade does not undergo impact testing; Q345B grade is tested at room temperature (20°C); Q345C grade is tested at 0°C; Q345D grade is tested at -20°C; and Q345E grade is tested at -40°C. The impact values vary at different testing temperatures. 2. Low-alloy steel plate: This material belongs to the low-alloy series in steel plates. Among low-alloy materials, this is the most common type. Q345 was previously known as 16Mn. The external standard for Q345 is GB709, and the internal standard is GB/T1591-94. Due to these standards, this type of steel plate is allowed to be delivered with negative tolerance.