Q500qE Bridge Steel Plate
High-strength structural steel designed for bridge engineering, compliant with GB/T 714-2015, offering excellent durability and reliability at -40°C low-temperature environment.
About Q500qE Bridge Steel Plate
Q500qE is a high-strength low-alloy structural steel under Chinese standard (GB/T 714-2015), specially developed for large-span bridge engineering projects in ultra-low-temperature environments.
The letter "q" in the grade stands for "qiaoliang" (bridge), and "E" indicates the steel's impact test temperature is -40°C, suitable for large-span bridge construction projects in extremely cold regions of China and worldwide.
This steel features high yield strength (500MPa), excellent weldability, and outstanding ultra-low-temperature toughness, making it an ideal choice for large-span bridge infrastructure projects in frigid climate zones.
Technical Specifications
Basic Information
Mechanical Properties
| Thickness(mm) | Yield Strength(MPa) ≥ | Tensile Strength(MPa)≥ | Elongation(%) ≥ | Impact Energy(J) ≥ |
|---|---|---|---|---|
| ≤50 | 500 | 630 | 18 | 120 |
| ＞50--≤100 | 480 | 630 | 18 | 120 |
| ＞100--≤150 | - | 630 | 18 | 120 |
Q500qE Chemical composition of thermomechanically rolled steel
| Grade | Quality grade | Chemical Composition (Mass Fraction) / % | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | Nb | V | Ti | Als | Cr | Ni | Cu | Mo | N | ||||
| Q500q | E | ≤0.11 | ≤0.55 | 1.00~1.70 | 0.010~0.090 | 0.010~0.080 | 0.006~0.030 | ≤0.010~0.045 | ≤0.50 | ≤0.30 | ≤0.30 | ≤0.25 | ≤0.008 | ||
Q500qE Chemical composition of tempered steel
| Grade | Quality grade | Chemical Composition (Mass Fraction) / % | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | Mn | Nb | V | Ti | Als | Cr | Ni | Cu | Mo | N | ||
| Q500q | E | ≤0.11 | ≤0.55 | 0.80~1.70 | 0.005~0.060 | 0.010~0.080 | 0.006~0.030 | 0.010~0.045 | ≤0.80 | ≤0.70 | ≤0.30 | ≤0.30 | ≤0.0080 |
International Standard Comparison
Mechanical Properties Comparison (Thickness ≤50mm)
| Property | Q500qE | S500NL | A709 Gr50 |
|---|---|---|---|
| Min Yield Strength (MPa) | 500 | 500 | 345 |
| Tensile Strength (MPa) | 630 | 590-770 | 450-600 |
| Min Elongation (%) | 18 | 21 | 21 |
| Impact Test Temperature (°C) | -40 | -20 | 0 |
Chemical Composition Comparison (%)
| Element | Q500qE | S500NL | A709 Gr50 |
|---|---|---|---|
| Carbon (C) | ≤0.11 | ≤0.22 | ≤0.23 |
| Silicon (Si) | ≤0.55 | ≤0.60 | 0.15-0.40 |
| Manganese (Mn) | 1.00-1.70 | 1.40-1.90 | 0.90-1.60 |
Key Differences Summary:
- Q500qE offers high yield strength (500MPa) with excellent -40°C ultra-low-temperature toughness
- Designed for large-span bridge projects in extremely cold climate regions
- Excellent weldability with Ceq ≤ 0.44%
- Compliant with GB/T 714-2015 standard
Application Projects
Large-span Highway Bridge
Ideal for large-span highway bridges in extremely cold regions, providing excellent low-temperature stability at -40℃.
- Plate Thickness: 16mm-60mm
- Total Consumption: 12,800 tons
High-speed Railway Bridge
Applied to large-span high-speed railway bridges in frigid zones, featuring outstanding -40℃ low-temperature fatigue resistance.
- Total Consumption: 18,500 tons
- 100+ years service life
Large-span Urban Viaduct
Used for large-span urban viaducts in extremely cold regions, offering reliable -40℃ structural support.
- Plate Thickness: 20mm-80mm
- High load-bearing capacity
Frequently Asked Questions (FAQ)
What is the difference between Q500qE and Q500qD/Q500qF steel plates?
Main differences between Q500qE, Q500qD and Q500qF bridge steel plates:
- Impact Test Temperature: Q500qD (-20°C) < Q500qE (-40°C) < Q500qF (-60°C)
- Low-Temperature Performance: Q500qF > Q500qE > Q500qD
- Application: Q500qD for cold areas, Q500qE for extremely cold areas, Q500qF for frigid areas
- Strength Level: All grades feature 500MPa high yield strength for large-span bridges
What are the welding requirements for Q500qE steel plates?
Q500qE has good weldability (Ceq ≤0.44%) with ultra-low-temperature construction requirements:
- Preheating to 120-180℃ recommended for thickness >30mm in extremely cold environments
- Use E60 series low-alloy electrodes (E6015/E6016) for conventional welding
- Interpass temperature control ≤230℃ during multi-pass welding
- Post-weld heat treatment not required for general bridge components
What is the operating temperature range of Q500qE steel?
Q500qE is designed for ultra-low temperature environments with the following temperature range:
- Minimum Operating Temperature: -40°C (meets impact energy requirements at this temperature)
- Recommended Continuous Operating Temperature: -40°C ~ 200°C
- Short-term Maximum Operating Temperature: 300°C
What advantages does Q500qE have for large-span bridge construction?
Q500qE has outstanding advantages for large-span bridge construction:
- High yield strength: 500MPa, suitable for large-span bridge load-bearing requirements
- Excellent ultra-low-temperature toughness: Stable performance at -40°C
- Good weldability: Suitable for large-scale bridge construction in extremely cold regions
- National standard certification: Fully compliant with GB/T 714-2015 bridge steel standards
What quality inspections are performed for Q500qE steel plates?
Comprehensive quality inspections are provided for Q500qE steel plates:
- EN 10204 3.1 material test certificate with -40°C impact test results
- GB/T 714-2015 bridge steel compliance certification
- 100% ultrasonic testing for internal quality inspection
- Mechanical property test including yield and tensile strength
- -40°C Charpy V-notch impact toughness test report
Core Advantages
500MPa High Yield Strength
Superior load-bearing capacity for large-span bridges.
Excellent Weldability
Optimized composition ensures reliable welding performance.
-40℃ Low-Temperature Toughness
Stable performance in extremely cold climate environments.
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