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High-strength structural steel standard GB/T1591

High-strength structural steel standard GB/T1591

GB/T1591 standard specifies low alloy high strength structural steel. 
GB/T1591 steel grades: Q295, Q345C,Q390C, Q420,Q460D
Chemical composition in table 1
Grade  Quality level Chemical composition (%)
C≤ Mn Si ≤ P ≤ S ≤ V Nb Ti Al≥ Cr≤ Ni≤
Q295 A O.16 0.8 0.55 0.045 0.045 0.02 0.015 O.02      
B ~1.50 0.04 O.040 ~O.15 ~O.060 ~0.20      
Q345 A O.20 1 0.55 0.045 O.045 O.02~O.15 O.015~0.06 O.02~O.20      
B ~1.60 O.040 O.040      
C   0.035 0.035 O.015    
D O.18   0.03 O.030 O.015    
E   0.025 O.025 O.015    
Q390 A O.20 1 O.55 0.045 0.045 O.02~O.20 O.015~0.06 O.02~O.20   O.30 0.7
B ~1.60 O.040 O.040   O.30 O.70
C   O.035 O.035 O.015 0.3 O.70
D   O.030 0.03 0.015 O.30 0.7
E   0.025 O.025 O.015 O.30 0.7
Q420 A O.20 1 O.55 O.045 O.045 O.02~O.20 O.015~0.06 O.02~O.20   O.40 O.70
B 0.04 O.040   O.40 O.70
C 1.7 O.035 O.035 0.015 0.4 O.70
D   O.030 0.03 0.015 O.40 O.70
E   0.025 0.025 0.015 O.40 O.70
Q460 C O.20 1   0.035 0.035 O.02~O.20 O.015~0.06 O.02~O.20 O.015 O.70 0.7
D O.55 O.030 0.03 0.015 0.7 0.7
E 1.7   0.025 O.025 O.015 0.7 0.7
Mechanical properties are shown in Table 2
Grade  Quality level Yield point ós/Mpa ≥ Tensile strength ób/MPa  Elongation δ5 (%) ≥ Impact absorption work Akv (longitudinal)
Thickness (diameter, side length) / mm /J    ≥
≤16 >16~35 >35~50 >50~100 +20℃ O℃ -20℃ -40℃
Q295 A 295 275 255 235 390~570 23        
B 23 34      
Q345 A 345 325 295 275 470~630 21        
B 2l 34      
C 22   34    
D 22     34  
E 22       27
Q390 A 390 370 350 330 490~650 19        
B 19 34      
C 20   34    
D 20     34  
E 20       27
Q420 A 420 400 380 360 520 18        
B ~680 18 34      
C   19   34    
D   19     34  
E   19       27
Q460 C 460 440 420 400 550 17   34    
D ~720 17     34  
E   17       27

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