A detailed introduction to Q345 grade | ||||||||||||||
Q345 can be divided into Q345A, Q345B, Q345C, Q345D and Q345E according to the grade. What they represent is that the temperature of the impact is different. | ||||||||||||||
Q345A level, is not to impact; | ||||||||||||||
Q345B grade, 20 degrees normal temperature impact; | ||||||||||||||
Q345C, which is 0 degree impact; | ||||||||||||||
Q345D level, which is-20 degree impact; | ||||||||||||||
Q345E, which is-40 degree impact. | ||||||||||||||
At different impact temperatures, the impact value is also different. | ||||||||||||||
Product introduction | ||||||||||||||
Q345B is a B-grade low-carbon alloy steel. | ||||||||||||||
Properties of Q345B carbon steel square pipe; | 1. Good comprehensive mechanical properties, good cold and hot workability, welding performance and corrosion resistance. 2. Good low temperature performance, cold stamping performance and good machinability. | |||||||||||||
Q345B carbon steel square pipe uses: | Q345B steel is characterized by good comprehensive performance, good low temperature performance, cold stamping performance, good weldability and machinability. Widely used in bridges, vehicles, ships, buildings, pressure vessels and so on. | |||||||||||||
technical parameter | ||||||||||||||
Typical alloy | Q345B carbon steel square pipe | |||||||||||||
thickness | Can be customized according to requirements. | |||||||||||||
length | Can be customized according to requirements. | |||||||||||||
Implementation standard: | GB /T 1591-2008 | |||||||||||||
American Standard | A709 Gr50 | |||||||||||||
European standard | S335JR | |||||||||||||
Typical product | Bridges, vehicles, ships, | |||||||||||||
Content of chemical elements (%) | ||||||||||||||
ingredient | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | N | Ti | V | Nb | |
minimum value | - | - | - | - | - | - | - | - | - | - | - | - | - | |
maximum | 0.2 | 0.5 | 1.7 | 0.035 | 0.035 | 0.3 | 0.5 | 0.3 | 0.1 | 0.012 | 0.2 | 0.15 | 0.07 | |
comparison table | ||||||||||||||
China | Japan | United States of America | International organization for standards | Germany | France | European standard | Sweden | Britain | ||||||
GB | JIS | ASTM | ISO | DIN EN/DIN | NF EN/NF | EN | Digital grade | SS | BS EN/BS | |||||
Q345B Q345C | SM490A SS490 | A572 A678Gr.A SSGrade50 | E355C Fe510B | St52-3 | E36-2 | S355JR Fe510B | 1.0045 | Jan-32 | 50B |
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