What's the Q345GJB steel?

Q345GJB steel is a steel plate for high-performance building structures, commonly known as steel for high-rise buildings.

Q345GJB steel meaning

Q: Yield strength;

345: 6-35mm is, the yield strength is greater than 345MPa, which is equivalent to the original 16Mn strength grade;

GJ: steel plate for high-performance building structure, short for Gao Jian;

B: Quality level (divided into 4 levels of BCDE), B means that when the room temperature is 20℃, the impact energy meets 34; CDE means that the temperature is gradually reduced by 20℃

Q345GJB steel is a kind of structural steel. The size, shape, weight and allowable deviation of the steel plate should meet the requirements of GB/T 709, and the negative deviation of thickness is limited to -0.3mm.

The delivery status of the steel plate is: hot rolling, normalizing, normalizing rolling, normalizing + tempering, quenching + tempering or TMCP.