Q500q STEEL – STRUCTURAL STEEL
Q500q STEEL – STRUCTURAL STEEL
Q500q is a high-strength structural steel commonly used in heavy-duty construction projects like bridges and high-rise buildings. The “Q” in its name stands for “Quenching,” a heat treatment process that enhances the steel’s strength and toughness. The number “500” represents its minimum yield strength of 500 MPa, ensuring it can handle significant loads. This steel is known for its excellent mechanical properties, including high tensile strength, good toughness, and resistance to impact and fatigue.
Description
What is Q500q
Q500q steel is composed of approximately 97-99% iron and 1-3% alloying elements such as carbon, manganese, silicon, and chromium. It is typically available in solid, flat, or plate forms and is commonly used in a greyish metallic color. Q500q is known for its high strength, good toughness, and excellent fatigue resistance. It is primarily used in fields like bridge construction, high-rise buildings, and heavy machinery. The steel is processed through hot rolling, which enhances its mechanical properties. Q500q steel can be further classified into subgrades based on thickness and mechanical requirements, such as Q500qC, Q500qD, and Q500qE.Characteristics of Q500q Steel
Q500q steel is highly valued for its exceptional load-bearing capacity, making it ideal for heavy-duty structures like bridges and skyscrapers. It offers superior corrosion resistance, especially in harsh environments such as offshore platforms. Its high toughness allows it to withstand significant impacts, making it suitable for heavy machinery and high-rise buildings. With an optimal strength-to-weight ratio, Q500q steel supports efficient and cost-effective designs. Its versatility across various applications, from bridge components to critical infrastructure, and reliability under extreme conditions.Chemical Compositions
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.18 max |
| Silicon (Si) | 0.50 max |
| Manganese (Mn) | 1.00 – 1.60 |
| Phosphorus (P) | 0.030 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 0.30 max |
| Nickel (Ni) | 0.50 max |
| Copper (Cu) | 0.30 max |
| Vanadium (V) | 0.10 max |
| Molybdenum (Mo) | 0.10 max |
| Niobium (Nb) | 0.07 max |
Physical Properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.85 g/cm³ | 0.283 lb/in³ |
| Melting Point | 1425-1460°C | 2597-2660°F |
| Thermal Conductivity | 50.2 W/m·K | 29 Btu·ft/h·ft²·°F |
| Specific Heat Capacity | 486 J/kg·K | 0.116 Btu/lb·°F |
| Thermal Expansion Coefficient | 11.7 × 10⁻⁶ /°C | 6.5 × 10⁻⁶ /°F |
| Electrical Resistivity | 0.2 µΩ·m | 0.12 µΩ·ft |
Mechanical Properties
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 520-680 MPa | 75,400-98,600 psi |
| Yield Strength | 420 MPa | 60,900 psi |
| Brinell Hardness (HB) | 170-210 HB | 170-210 HB |
| Rockwell Hardness (HRC) | 20-25 HRC | 20-25 HRC |
| Vickers Hardness (HV) | 180-220 HV | 180-220 HV |
| Elongation | 16-20% | 16-20% |
| Elastic Modulus | 200 GPa | 29,000 ksi |
After QT processing, Q500q steel exhibits the following typical mechanical properties:
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 580-720 MPa | 84,200-104,400 psi |
| Yield Strength | 500-600 MPa | 72,500-87,000 psi |
| Impact Toughness | ≥ 34 J (at -20°C) | ≥ 25 ft·lbf (at -4°F) |
| Elongation | 15-18% | 15-18% |
| Reduction of Area | ≥ 55% | ≥ 55% |
| Elastic Modulus | 200 GPa | 29,000 ksi |
Industries & Applications
| Industry | Products |
|---|---|
| Automotive | Chassis Components, Structural Frames, Suspension Systems, Reinforcement Bars |
| Bridge Construction | Girders, Trusses, Deck Plates, Pylons |
| Critical Infrastructure | Power Plant Boilers, Offshore Platform Legs, Refinery Piping, Chemical Plant Frames |
| Heavy Machinery and Equipment | Excavator Arms, Bulldozer Blades, Crane Booms, Loader Frames |
| High-Rise Buildings | Columns, Beams, Braces, Reinforced Concrete Cores |
| Shipbuilding | Hull Plates, Bulkheads, Frames, Decks |
| Railway | Rails, Bridges, Track Components, Wheel Assemblies |
| Mining | Mining Truck Frames, Drilling Equipment, Conveyor Systems, Ore Crushers |
Machining
Q500q Heat Treating Instructions:
- Quenching: The steel is rapidly cooled from a high temperature to lock in a hard microstructure.
- Tempering: The steel is reheated to a lower temperature to reduce brittleness and improve ductility.
- Controlled Parameters: Specific temperatures and times are carefully chosen based on the desired mechanical properties.
Q500q Surface Finish:
- Hot-Dip Galvanizing: The steel is coated with zinc to enhance corrosion resistance.
- Painting: Provides both protection and an aesthetic finish, customizable in color and texture.
- Powder Coating/Anodizing: Additional protective coatings that enhance durability and resistance to environmental damage.
- Custom Surface Treatments: Other surface finishes can be applied based on specific application requirements.
Custom grades of Q500q steel can be produced to meet specific requirements.
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!
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