GB/T1591 Q345A/B/C/D/E steel plate is a kind of steel material. GB/T1591 Q345A/B/C/D/E steel plate is a low carbon alloy steel (c<0.2%), with good comprehensive performance, low temperature performance, cold stamping performance, good weldability and good machinability. GB/T1591 Q345A/B/C/D/E steel plate widely used in bridges, vehicles ships, buildings, pressure vessels and so on. Q stands for the yield of this material, and the latter 345 refers to the yield of this material, around 345MPa. And the GB/T1591 Q345A/B/C/D/E steel plate yield value will decrease as the thickness of the material increases.

GB/T1591 Q345A/B/C/D/E steel plate consists of Q+ numeral + quality grade symbol + deoxidization method symbol. The steel dubbed "Q", representing the yield point of steel, behind the digital representation of the yield point value, in units of MPa such as Q235 (s) said the yield point for carbon steel 235 MPa.
The necessary grades can be marked behind said deoxidation methods of quality grades and symbols. The quality class symbols are A, B, C, D, E. Deoxidation method notation: F means boiling steel; B represents semi killed steel: Z indicates calm steel; TZ stands for special sedation steel; calm steel is not marked; Z and TZ are not standard. For example, Q235-AF indicates a class of rimmed steel.

GB/T1591 Q345A/B/C/D/E steel plate, the carbon steel for special purposes, such as steel, marine steel bridge, basically adopt carbon steel structure representation, but added that the final use of steel letters.
GB/T1591 Q345A/B/C/D/E steel plate birth 16Mn small caliber seamless steel;

Product Description: Q345A (GB/T 1591-1994) wt.% performance and application: naming method similar to Q235. Q345a, Q345b, Q345c, Q345d, Q345e. This is a class distinction, the main impact of the temperature is different! Q345a, do not impact; grade Q345b, 20 degrees Q345c, is a normal impact; 0 degree impact; grade Q345d, -20 degree of impact; grade Q345e, -40 degree of impact. At different shock temperatures, the shock values are also different.
In sheet metal, it is a low alloy series. In the low alloy material, this material is the most common. GB/T1591 Q345A/B/C/D/E steel plate used to be called "16Mn".
The external standard of GB/T1591 Q345A/B/C/D/E steel plate is: gb709, the internal standard is: gb/t1591-94, because of the standard implementation, this kind of steel plate allows negative tolerance delivery. The latest executive standard is GB/T1591-2008.
For the detection of GB/T1591 Q345A/B/C/D/E steel plate one is whether the content of steel reached the national standard, the most important one is the mechanical performance inspection of steel professional organizations (yield strength, tensile test) meets the standards.
More about Q345 steel application and introduction and if you need the factory price of Q345 steel stock, contact with us at any time, we also have many other brand names, such as Q235B,Q345B.