Structural Steel Plates for Bridges
Structural Steel Plates for Bridges
Main Application
The Q345q, Q370q, Q420q and Q500q series of steel plates are made through advanced process, which are characterized by pure steel quality, good mechanical properties and excellent welding and processing performance, and are mainly used to manufacture various bridge structures and mechanical structures.
Delivery Conditions
Hot rolled, controlled rolled, thermo mechanical control processing (TMCP) or thermo mechanical control processing (TMCP) + tempered, normalized or quenched+tempered.
Steel Grades
Category | Standard | Grade | Remarks |
Chinese standards |
GB714 | Q345qC/D/E、Q370qC/D/E、Q420qD/E/F、Q460qD/E/F、Q500qD/E/F、Q550qD/E/F、（Z15、Z25、Z35）Q345qC/D/ENH Q370qC/D/ENH、Q420qD/E/FNH、Q460qD/E/FNH、 Q500qD/E/FNH、Q550qD/E/FNH、（Z15、Z25、Z35） |
Structural Steel for Bridges |
Foreign standards |
ASTM A709/A709M |
A709Gr50、HPS485WF、A709Gr50WBF | Structural Steel for Bridges |
Chemical Composition Maximum (%)
Grade | C | Si | Mn | P | S | Others | CEV | Pcm |
Q345qC/D/E | 0.18 | 0.55 | 0.9～1.70 | 0.030/0.025/0.020 | 0.025/0.020/0.010 | Moderate | 0.43 | / |
Q370qC/D/E | 0.18 | 0.55 | 1.00～1.70 | 0.030/0.025/0.020 | 0.025/0.020/0.010 | Moderate | 0.44 | / |
Q420qD/E/F | 0.11 | 0.55 | 1.00～1.70 | 0.025/0.020/0.015 | 0.020/0.010/0.006 | Moderate | / | 0.22 |
Q460qD/E/F | 0.11 | 0.55 | 1.00～1.70 | 0.025/0.020/0.015 | 0.020/0.010/0.006 | Moderate | / | 0.23 |
Q500qD/E/F | 0.11 | 0.55 | 0.80～1.70 | 0.025/0.020/0.015 | 0.020/0.010/0.006 | Moderate | 0.50 | / |
Q550D/E/F | 0.12 | 0.55 | 0.80～1.70 | 0.025/0.020/0.015 | 0.020/0.010/0.006 | Moderate | 0.52 | / |
Q345q/D/E/FNH |
0.11 |
0.15～0.50 |
1.10～1.50 |
0.025/0.020/0.015 |
0.020/0.010/0.006 |
Moderate | / | 0.20 |
Q370q/D/E/FNH | / | 0.20 | ||||||
Q420qD/E/FNH | / | 0.22 | ||||||
Q460qD/E/FNH | / | 0.23 | ||||||
Q500qD/E/FNH | / | 0.25 | ||||||
Q550qD/E/FNH | / | 0.25 |
Mechanical Properties
Grade |
Yield Strength Rel, MPa |
Tensile Strength Rm, MPa |
Elongation A, % | Impact Absorbed Energy,Akv (Longitudinal) |
Bend 180° | |
Temp, ℃ | Min, J | |||||
Q345qC/D/E | ≥345 | ≥490 | ≥20 | 0/-20/-40 | 120 | OK |
Q370qC/D/E | ≥370 | ≥510 | ≥20 | 0/-20/-40 | 120 | OK |
Q420qD/E/F | ≥420 | ≥540 | ≥19 | -20/-40/-60 | 120/120/47 | OK |
Q460qD/E/F | ≥460 | ≥570 | ≥18 | -20/-40/-60 | 120/120/47 | OK |
Q500qD/E/F | ≥500 | ≥630 | ≥18 | -20/-40/-60 | 120/120/47 | OK |
Q550qD/E/F | ≥550 | ≥660 | ≥16 | -20/-40/-60 | 120/120/47 | OK |
Typical Mechanical Properties
Grade |
Yield Strength Rel, MPa |
Tensile Strength Rm, MPa |
Elongation A, % | Impact Absorbed Energy,Akv (Longitudinal) |
Bend 180° | |
Temp, ℃ | J | |||||
Q345qC/D/E | 355～390 | 510～560 | 28 | 0/-20/-40 | ≥200 | OK |
Q370qC/D/E | 390～430 | 530～580 | 26 | 0/-20/-40 | ≥220 | OK |
Q420qD/E/F | 440～480 | 570～620 | 24 | -20/-40/-60 | ≥240 | OK |
Q460qD/E/F | 480～520 | 610～650 | 22 | -20/-40/-60 | ≥240 | OK |
Q500qD/E/F | 520～570 | 640～680 | 20 | -20/-40/-60 | ≥240 | OK |
Q550qD/E/F | 570～610 | 690～630 | 18 | -20/-40/-60 | ≥240 | OK |
Q345qD/E/FNH | 360～400 | 520～570 | 27 | -20/-40/-60 | ≥240 | OK |
Q420qD/E/FNH | 450～490 | 580～630 | 23 | -20/-40/-60 | ≥280 | OK |
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