What is Q345 steel?
Low-alloy high-strength structural steel, formerly designated 16Mn, with a yield strength ≥345MPa.
What does the designation mean?
Q = Yield strength, 345 = Minimum yield strength (MPa), followed by the quality grade A/B/C/D/E.
What standard does it conform to?
National Standard GB/T 1591-2018 (replaces the old version).
What are the differences between Q345 and Q235?
Q345 has a higher yield strength (345 vs 235MPa), more alloying elements, better low-temperature toughness, and a slightly higher price.
What is the relationship between Q355 and Q345?
Q355 is an upgraded replacement for Q345, with a yield strength ≥355MPa, and superior low-temperature toughness and weldability.