Q345 steel is a Chinese GB standard Low Alloy High Strength Structural Steel, material density is 7.85 g/cm3, tensile strength is 470-630 Mpa, and yield strength is 345 MPa, it has better properties than Q235. According to GB/T 1591 – 2008, Q345 material has 5 quality grades: Q345A, Q345B, Q345C, Q345D and Q345E.
Q345 steel has good weldability, cold & hot workability and corrosion resistance. Widely used in bridges, ships, boilers, pressure vessels, petroleum storage tanks, lifting transport machinery and other high-load welded structural parts.
"Q" is the first letter of Chinese Pinyin: "qu fu dian", that means Yield Point, "345" is the minimum value of yield strength 345 MPa for steel thickness ≤16mm.
Datasheet and specification are listed in the tables below, including chemical composition, machenical properties, etc.
Based on melting analysis.
Notes: The P and S contents of profiles and bars can be increased by 0.005%, and the upper limit of Grade A steel can be 0.0045%.
Charpy (V-notch) impact test temperature and impact absorption energy (KV2/J), thickness (t).
Q345 steel: Q345A, Q345B, Q345C, Q345D, Q345E equivalent to US ASTM, European Germany DIN, British BS, France NF, Japan JIS, and ISO Standard (For Reference).
Notes: Q345 steel has been replaced by Q355 in the latest version of GB standard "GB/T 1591 – 2018", the previous version is "GB/T 1591 – 2008".
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