Material properties Material
Q345B (China / GB)
Group
Structural and constructional steels
Subgroup
GB/T 1591 (1994) High strength low alloy structural steels
Comment
Symbol Q345 superseded the old designations: 12MnV, 14MnNb, 16Mn, 16MnRE, 18Nb.
Application
Yield Stress[MPa] Dimension
Max
Min
Approx
Plate, strip, sheet; dim. <= 16 mm
345
-
-
Plate, strip, sheet; 16 < dim. <= 35 mm
325
-
-
Plate, strip, sheet; 35 < dim. <= 50 mm
295
-
-
Plate, strip, sheet; 50 < dim. <= 100 mm
275
-
-
Tensile Stress[MPa] Dimension
Max
Min
Approx
Plate, strip, sheet; dim. <= 16 mm
470
630
-
Plate, strip, sheet; 16 < dim. <= 35 mm
470
630
-
Plate, strip, sheet; 35 < dim. <= 50 mm
470
630
-
Plate, strip, sheet; 50 < dim. <= 100 mm
470
630
-
Elongation A5 [%] Dimension
Max
Min
Approx
Plate, strip, sheet; dim. <= 16 mm
21.0
-
-
Plate, strip, sheet; 16 < dim. <= 35 mm
21.0
-
-
Plate, strip, sheet; 35 < dim. <= 50 mm
21.0
-
-
Plate, strip, sheet; 50 < dim. <= 100 mm
21.0
-
-
Impact [J] Dimension
Max
Min
Approx
Plate, strip, sheet; dim. <= 16 mm Impact Test: Charpy V Notch
34
-
-
Plate, strip, sheet; 16 < dim. <= 35 mm Impact Test: Charpy V Notch
34
-
-
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Impact [J] Dimension
Max
Min
Approx
Plate, strip, sheet; 35 < dim. <= 50 mm Impact Test: Charpy V Notch
34
-
-
Plate, strip, sheet; 50 < dim. <= 100 mm Impact Test: Charpy V Notch
34
-
-
Chemical Composition [%] Criterion
Max
Min
Approx
C
-
0.2000
-
Si
-
0.5500
-
1.0000
1.6000
-
P
-
0.0400
-
S
-
0.0400
-
V
0.0200
0.1500
-
Ti
0.0200
0.2000
-
Nb
0.0150
0.0600
-
Mn
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