GB/T1591 standard: Grade Q345A, Q345B, Q345C, Q345D, and Q345E alloy steel are high strength low alloy structural steel plates, steel strips, steel sections, steel bars, etc. for general structural and engineering purposes. GB/T1591 Q345A | Q345B | Q345C | Q345D | Q345E steel plates composition and mechanical properties are listed below.
GB/T1591 Grade Q345A Steel Composition and Mechanical Properties
C max
|
Si max.
|
Mn max
|
P max
|
S max
|
Nb max.
|
V max.
|
Ti max
|
Cr max
|
Ni max
|
Cu max
|
N max
|
Mo max
|
B max
|
Ala min
|
0.20
|
0.50
|
1.70
|
0.035
|
0.035
|
0.07
|
0.15
|
0.20
|
0.30
|
0.50
|
0.30
|
0.012
|
0.10
|
-
|
-
|
Yield Strength (MPa) min. (t≤16mm)
|
Yield Strength (MPa) min.(16mm<t≤25.4mm)
|
Tensile Strength (MPa)
|
Elongation % min.
| |||||||||||
345
|
335
|
470-630
|
20
| |||||||||||
GB/T1591 Grade Q345B Steel Composition and Mechanical Properties
C max
|
Si max.
|
Mn max
|
P max
|
S max
|
Nb max.
|
V max.
|
Ti max
|
Cr max
|
Ni max
|
Cu max
|
N max
|
Mo max
|
B max
|
Ala min
|
0.20
|
0.50
|
1.70
|
0.035
|
0.035
|
0.07
|
0.15
|
0.20
|
0.30
|
0.50
|
0.30
|
0.012
|
0.10
|
-
|
-
|
Yield Strength (MPa) min. (t≤16mm)
|
Yield Strength (MPa) min.(16mm<t≤25.4mm)
|
Tensile Strength (MPa)
|
Elongation % min.
| |||||||||||
345
|
335
|
470-630
|
20
| |||||||||||
GB/T1591 Grade Q345C Steel Composition and Mechanical Properties
C max
|
Si max.
|
Mn max
|
P max
|
S max
|
Nb max.
|
V max.
|
Ti max
|
Cr max
|
Ni max
|
Cu max
|
N max
|
Mo max
|
B max
|
Ala min
|
0.20
|
0.50
|
1.70
|
0.030
|
0.030
|
0.07
|
0.15
|
0.20
|
0.30
|
0.50
|
0.30
|
0.012
|
0.10
|
-
|
0.015
|
Yield Strength (MPa) min. (t≤16mm)
|
Yield Strength (MPa) min.(16mm<t≤25.4mm)
|
Tensile Strength (MPa)
|
Elongation % min.
| |||||||||||
345
|
335
|
470-630
|
20
| |||||||||||
GB/T1591 Grade Q345D Steel Composition and Mechanical Properties
C max
|
Si max.
|
Mn max
|
P max
|
S max
|
Nb max.
|
V max.
|
Ti max
|
Cr max
|
Ni max
|
Cu max
|
N max
|
Mo max
|
B max
|
Ala min
|
0.18
|
0.50
|
1.70
|
0.030
|
0.025
|
0.07
|
0.15
|
0.20
|
0.30
|
0.50
|
0.30
|
0.012
|
0.10
|
-
|
0.015
|
Yield Strength (MPa) min. (t≤16mm)
|
Yield Strength (MPa) min.(16mm<t≤25.4mm)
|
Tensile Strength (MPa)
|
Elongation % min.
| |||||||||||
345
|
335
|
470-630
|
21
| |||||||||||
GB/T1591 Grade Q345E Steel Composition and Mechanical Properties
C max
|
Si max.
|
Mn max
|
P max
|
S max
|
Nb max.
|
V max.
|
Ti max
|
Cr max
|
Ni max
|
Cu max
|
N max
|
Mo max
|
B max
|
Ala min
|
0.18
|
0.50
|
1.70
|
0.025
|
0.020
|
0.07
|
0.15
|
0.20
|
0.30
|
0.50
|
0.30
|
0.012
|
0.10
|
-
|
0.015
|
Yield Strength (MPa) min. (t≤16mm)
|
Yield Strength (MPa) min.(16mm<t≤25.4mm)
|
Tensile Strength (MPa)
|
Elongation % min.
| |||||||||||
345
|
335
|
470-630
|
21
| |||||||||||
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