Q345 series steel includes Q345A, Q345B, Q345C, Q345D, and Q345E, where Q represents the yield strength, the latter number 345 represents the yield point value (in MPa), and the letters A, B, C, D, and E respectively represent the low-temperature impact resistance of the steel, mainly due to the different impact temperatures. In short, Q345A does not do impact;Q345B, 20 ℃ room temperature impact;Q345C, 0 degree impact; Q345D, -20 degree impact;Q345E, -40 impact. Different impact temperature, impact value is also different.
Key Properties
Yield Strength: Min 345 MPa (for thickness ≤ 16mm).
Tensile Strength: 470-630 MPa.
Grades: A, B, C, D, E (varying impact tests).
Features: Excellent weldability, good formability, toughness.
Grades Explained (A to E)
Q345A: Basic grade, no specific impact testing.
Q345B: Impact test at 0°C (34 J).
Q345C: Impact test at 0°C (34 J).
Q345D: Impact test at -20°C (34 J).
Q345E: Impact test at -40°C (27 J).
Common Applications
Building structures
Bridge construction
Heavy machinery
Engineering projects
CHEMICAL COMPOSITION OF Q345 SERIES STEEL
|
Materials |
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Cu: |
V |
|
Q345A |
0.12-0.2 |
0.20-0.6 |
1.00-1.6 |
≤0.045 |
≤0.045 |
≤0.3 |
≤0.3 |
≤0.2 |
0.02-0.15 |
|
Q345B |
0.12-0.2 |
0.20-0.6 |
1.00-1.6 |
≤0.04 |
≤0.04 |
≤0.3 |
≤0.3 |
≤0.2 |
0.02-0.15 |
|
Q345C |
0.12-0.2 |
0.20-0.6 |
1.00-1.6 |
≤0.035 |
≤0.035 |
≤0.3 |
≤0.3 |
≤0.2 |
0.02-0.15 |
|
Q345D |
≤0.18 |
0.20-0.6 |
1.00-1.6 |
≤0.03 |
≤0.03 |
≤0.3 |
≤0.3 |
≤0.2 |
0.02-0.15 |
|
Q345E |
≤0.18 |
0.20-0.6 |
1.00-1.6 |
≤0.025 |
≤0.025 |
≤0.3 |
≤0.3 |
≤0.2 |
0.02-0.15 |
MECHANICAL PROPERTY OF Q345 SERIES STEEL
|
Materials |
Tensile strength, Mpa |
Yield strength, Mpa |
Elongation |
|
Q345A |
490-675 |
≥345 |
≥21 |
|
Q345B |
490-675 |
≥345 |
≥21 |
|
Q345C |
490-675 |
≥345 |
≥22 |
|
Q345D |
490-675 |
≥345 |
≥22 |
|
Q345E |
490-675 |
≥345 |
≥22 |
