Q345A
Q345A steel and Q345B, C, D, E steel comparison. Low temperature impact test temperature overshoot, good performance. Containing hazardous materials P, S ratio Q345B, C, D, E must be high.
Market price than Q345B, C, D, E to low

① by Q + digital + quality rating symbols + deoxy method symbols. Its steel dubbed "Q", on behalf of the yield point of steel, the latter figure represents the yield point value, such as Q235, said the unit is MPa yield point (σs) of 235 MPa of carbon structural steel.

② when necessary, can be marked symbols representing the steel quality grade and deoxy method. Quality rating symbols are A, B, C, D. Deoxy method symbol: F indicates boiling steel; b represents semi-killed steel: Z represents killed steel; TZ said special killed steel, killed steel without standard symbols, namely Z and TZ can not marked. For example Q235-AF represent Class A boiling steel.

③ special-purpose carbon steel, such as bridge steel, marine steel, basically representation carbon structural steel, but said the use of additional steel last letter.

What are the mechanical properties of Q345A is:

Wall thickness mm ≤16, elongation δ5≥ (%) 21, the yield strength δs (MPa≥) 345, without ℃ test temperature, tensile strength σb (MPa≥) (470-630). [1]