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Q500q Series | Structural Steel for Bridge

Q500q Series | Structural Steel for Bridge

SteelPRO Group provides Q500q series structural steel plates for bridges in stock.

Standards: ISO, ASTM/ASME/AISI, EN, GB/T, DIN, JIS, BS, etc.
Grades: Q500qD/E,  Q500qDNH/ENH
Material: High-Strength Low-Alloy Steel (HSLA)
Thickness: 8-100 mm, or customized
Width: 900-4800 mm, or customized
Length: 3000-25000 mm, or customized
Shape: Plate, Profile (I-beam, H-beam, Angle, Channel, Square bar, Flat bar), Pipe, Coil, Bar, or as request
Condition of Delivery: N/HR/A/T/Q+T/TMCP, or as request
Stock: In stock
Origin: Hebei/Henan/Jiangsu, China
Port: Qingdao

Description

What Is Q500q?

Q500q steel is high-strength low-alloy (HSLA) steel, specifically engineered for bridge construction. It is primarily composed of carbon, manganese, silicon, and trace elements for enhanced properties.

Naming Rules: 

  • Q: Yield strength.
  • 500: Minimum yield strength of 500 MPa.
  • q: Suitable for bridge structure.
  • D/E/F: Quality grades. Toughness at -20℃/-40℃/-60℃. (e.g. Q500qD)
  • NH: Weather-resistant, designed to withstand atmospheric corrosion. (e.g. Q500qDNH)
  • Z-: Z-direction performance grade, such as Z15, Z25. (e.g. Q500qDNHZ15)

Q500q steel offers excellent mechanical properties, including high strength, toughness, and superior weldability. It is available in three grades—Q500qD, Q500qE, and Q500qF—each with varying impact resistance levels to meet different environmental and structural requirements.

  • Q500qD: Suitable for general bridge structures with moderate impact resistance.
  • Q500qE: Enhanced toughness for bridges in colder climates or with high dynamic loads.
  • Q500qF: Highest impact resistance, ideal for demanding applications like suspension or cable-stayed bridges.

Q500q series steel is widely used in critical bridge components such as main structures, bridge decks, piers, and towers. Its combination of high strength and low weight reduces overall structural load and construction costs. Furthermore, its excellent weldability ensures ease of fabrication and structural integrity during installation.

Characteristics of Q500q Series Steel

  • High strength, providing excellent load-bearing capacity
  • Good toughness, resisting cracking under stress
  • High weldability, making it easy to join and fabricate
  • Corrosion-resistant, suitable for harsh environments
  • Durable in low temperatures, maintaining performance in cold climates
 

Chemical Compositions

ElementQ500qDQ500qE
Carbon, C≤0.11≤0.11
Silicon, Si≤0.55≤0.55
Manganese, Mn1.0 – 1.71.0 – 1.7
Phosphorus, P≤0.025≤0.02
Sulfur, S≤0.015≤0.01
Chromium, Cr≤0.8≤0.8
Nickel, Ni≤0.7≤0.7
Copper, Cu≤0.3≤0.3
Molybdenum, Mo≤0.3≤0.3
Nitrogen, N≤0.008≤0.008
Titanium, Ti0.006 – 0.030.006 – 0.03
Vanadium, V0.01 – 0.080.01 – 0.08
Niobium, Nb0.01 – 0.090.01 – 0.09
Boron, B≤0.0005≤0.0005
Aluminum, Al≤0.045≤0.045
Hydrogen, H≤0.0002≤0.0002

Note:

  • According to standard GB/T 714-2015.
  • Al, Nb, V, and Ti can be added individually or together. When added individually, they must meet the specified limits in the table. When combined, at least one must meet the minimum requirement, and the Nb, V, and Ti total should not exceed 0.22%.
  • Total aluminum content should range between 0.015% and 0.050%.
  • The manganese content can be increased to 2.00% by mutual agreement.
  • Analysis of B and H is not required if the supplier guarantees their presence.
  • The listed boron value represents the allowable content.

Physical Properties

PropertyMetricImperial
Density7.85 g/cm³0.283 lb/in³
Melting Point1425-1460°C2597-2660°F
Thermal Conductivity50.2 W/m·K29 Btu·ft/h·ft²·°F
Specific Heat Capacity486 J/kg·K0.116 Btu/lb·°F
Thermal Expansion Coefficient11.7 × 10⁻⁶ /°C6.5 × 10⁻⁶ /°F
Electrical Resistivity0.2 µΩ·m0.12 µΩ·ft

Mechanical Properties

GradeThickness (mm)Yield Strength (MPa)Tensile Strength (MPa)Elongation (%)Impact Temperature (°C)Impact Energy (Akv J)
Q500qD≤50≥500≥600≥16-20/-40 (Q500qD/Q500qE)≥41 (longitudinal)
Q500qE50-100≥480≥600≥16-20/-40 (Q500qD/Q500qE)≥41 (longitudinal)

Industries & Applications

IndustryApplication
ConstructionBridges, Structural Beams, High-rise Buildings, Tunnels
ShipbuildingHull Structures, Offshore Platforms, Decks, Bulkheads
EnergyWind Turbine Towers, Hydropower Plants, Oil Rigs, Pipelines
TransportationRail Tracks, Train Cars, Highway Barriers, Cranes
MiningDump Trucks, Excavators, Conveyor Systems, Loaders
Heavy MachineryCranes, Bulldozers, Forklifts, Agricultural Equipment
DefenseArmored Vehicles, Missile Launchers, Military Bridges, Protective Bunkers

Machining

Heat Treating

  • Preheating: 350°C–450°C: Hold until temperature stabilizes.
  • Austenitizing: 900°C–940°C: Hold for 30–60 minutes.
  • Quenching: Water/Polymer solution: Ensure proper agitation.
  • Tempering: 200°C–300°C: Hold for 1–2 hours.
  • Cooling: Slow cooling: Inspect for cracks or distortions.

Surface Finish

  • Shot Blasting: Clean surface, improve adhesion.
  • Pickling: Remove rust and scale using acid.
  • Painting: Apply protective coating for corrosion resistance.
  • Galvanizing: Zinc coating to prevent rust.
  • Polishing: Enhance surface finish and smoothness.
  • Laser Cladding: Strengthen surface with added material layer.
  • Plasma Nitriding: Increase surface hardness and wear resistance.

*Customization is available upon request.

Our Service

SteelPRO Group – manufacturer and solution provider for special steel, offering multi-industry application solutions and customised services, 100% quality free, accompanying customers in their growth!

Our Quality Control

  • Roundness
  • Tolerance
  • Microstructure
  • Non-Destructive Testing
  • Destructive Testing
  • Process Control

Service Integration Processing

  • Welding
  • Metal Fabrication
  • CNC Machining
  • Lathe
  • Forming

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