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S500 | High Strength Structural Steel

S500 | High Strength Structural Steel

S500 is a high-strength structural steel used in construction and engineering. “S” stands for structural, and “500” means a 500 MPa yield strength. Equivalent grades are ASTM A572/A572M Grade 50, Q500, ST52-3. It is strong, tough, weldable, and wear-resistant, ideal for bridges, buildings, and heavy machinery.

We offer S500Q/QL1/QL2 products with 6 to 150mm thicknesses, 900~4800 mm width, 3000~25000 mm length according to the EN 10025-6 standard.

Description

What is Steel S500?

S500 is a high-strength structural steel made primarily of iron, with small amounts of carbon, manganese, and silicon. It is produced as solid sheets or plates through hot rolling. With a yield strength of 500 MPa, it offers good weldability, toughness, and wear resistance, making it ideal for construction, bridges, and heavy machinery. It complies with the EN 10025-6 S500 standard. Its variants, such as S500Q, S500QL, and S500MC, are tailored for specific applications.

Characteristics of S500 Steel

S500 is a high-strength structural steel, offering excellent load-bearing and toughness due to its optimized alloy composition and heat treatment. Its fire resistance allows it to retain strength at high temperatures, making it reliable in demanding conditions. Good weldability results from controlled carbon content, enabling easier fabrication. It is widely used in construction, bridges, and heavy equipment. For better corrosion resistance or performance in cold environments, alternatives like S355, S460, or A572 are recommended, each suited to specific structural and environmental demands.

Chemical Compositions

ElementContent (%)
Carbon, C0.12 – 0.20
Manganese, Mn1.00 – 1.60
Phosphorus, P≤ 0.025
Sulfur, S≤ 0.010
Silicon, Si0.20 – 0.50
Chromium, Cr0.30 – 0.50
Nickel, Ni0.40 – 0.60
Molybdenum, Mo0.15 – 0.30
Vanadium, V0.02 – 0.10

Physical Properties

PropertyValue (Metric)Value (Imperial)
Density7.85 g/cm³0.283 lb/in³
Melting Point~1,500 °C~2,732 °F
Boiling Point~3,000 °C~5,432 °F
Thermal Conductivity40 – 50 W/m·K278 – 347 BTU·in/hr·ft²·°F
Electrical Conductivity5 – 10 MS/m5 – 10 MS/m
Specific Heat Capacity500 J/kg·K0.12 BTU/lb·°F
Thermal Expansion Coefficient12 x 10⁻⁶ /K6.7 x 10⁻⁶ /°F
Electrical Resistivity18 – 25 x 10⁻⁸ Ω·m18 – 25 x 10⁻⁸ Ω·m

Mechanical Properties

PropertyValue (Metric)Value (Imperial)
Tensile Strength500 – 700 MPa72,500 – 101,500 psi
Yield Strength≥ 500 MPa≥ 72,500 psi
Brinell Hardness180 – 250 HB180 – 250 HB
Rockwell Hardness85 – 95 HRB85 – 95 HRB
Vickers Hardness190 – 260 HV190 – 260 HV
Elongation10 – 15%10 – 15%
Elastic Modulus200 GPa29,000 ksi

Data After QT(Quenching and Tempering) Processing

 

PropertyMetricImperial
Tensile Strength700 – 850 MPa101,500 – 123,000 psi
Yield Strength≥ 620 MPa≥ 89,923 psi
Brinell Hardness260 – 320 HB260 – 320 HB
Rockwell Hardness95 – 100 HRB / 35 – 40 HRC95 – 100 HRB / 35 – 40 HRC
Vickers Hardness270 – 330 HV270 – 330 HV
Elongation8 – 12%8 – 12%
Elastic Modulus200 GPa29,000 ksi

Industries & Applications

IndustriesProducts
ConstructionBeams, Columns, Frames, Trusses, Braces
MiningShovels, Dump Bodies, Drill Pipes, Crushers, Chutes
Heavy EquipmentCranes, Bulldozers, Forklifts, Loaders, Excavators
TransportationRail Cars, Ship Hulls, Truck Frames, Cargo Containers, Bridges
EnergyWind Towers, Hydropower Structures, Pipelines, Nuclear Plant Frames, Transmission Poles
DefenseArmored Vehicles, Bunkers, Military Bridges, Missile Launchers, Tactical Equipment
ManufacturingPress Frames, Molds, Dies, Conveyor Components, Machine Tools
AerospaceStructural Panels, Landing Gears, Engine Mounts, Spacecraft Components, Reinforcements
LGS & Seismic BuildingsWall Panels, Roof Trusses, Floor Systems, Bracings, Reinforcement Frames

Machining

S500 Steel Heat Treatment Process

  1. Annealing:
    • Heat to 680 – 750°C (1250 – 1380°F), hold, and cool slowly in the furnace to soften the steel, relieve stress, and improve machinability.
  2. Preheating:
    • Heat to 500 – 600°C (930 – 1110°F) to prevent cracking during subsequent processes.
  3. Austenitizing:
    • Heat to 850 – 900°C (1560 – 1650°F) until the structure becomes austenite.
  4. Quenching:
    • Rapidly cool in oil or water to increase hardness and strength by forming martensite.
  5. Tempering:
    • Reheat to 200 – 600°C (390 – 1110°F) to relieve stress and enhance toughness without sacrificing hardness.

S500 Steel Surface Treatments

  1. Galvanization: Provides corrosion resistance with a zinc coating.
  2. Powder Coating: Enhances durability and offers color customization.
  3. Anodizing: Improves surface hardness and wear resistance.
  4. Shot Peening: Increases fatigue strength through surface compression.
  5. Electroplating: Adds a protective metal layer for corrosion and wear resistance.
  6. Polishing: Creates a smooth, reflective surface for aesthetics and functionality.
  7. Pickling and Passivation: Removes contaminants and prevents corrosion.
Custom surface treatment requirements can be accommodated upon request.
Disclaimer
The above heat treatment instructions and surface finish processing methods for Q550 steel are provided for informational purposes only. Actual results may vary based on specific conditions and equipment used. Testing is recommended, and a metallurgical expert or material supplier should be consulted to ensure the processes are suitable for your specific application. The user assumes all risks and liability for the use of this information.

 

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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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