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Q235 STEEL – STRUCTURAL STEEL

Q235 STEEL – STRUCTURAL STEEL

Q235 is a versatile carbon structural steel with a yield strength of 235 MPa. It is known for its excellent weldability, formability, and machinability, making it ideal for various construction and engineering applications. Q235 steel gets its name from its yield strength designation. The “Q” stands for “yield point,” and “235” indicates that the yield strength is 235 MPa. This versatile and widely used carbon structural steel is renowned for its excellent weldability, formability, and machinability, making it suitable for various applications.

Description

What is Q235?

Q235 is composed of approximately 99.85% iron and 0.15% carbon, making it a type of carbon steel. It is typically found in solid, flat shapes with a metallic grey color. Q235 is known for its good plasticity and weldability and is primarily used in construction and structural applications. It is processed through hot rolling. Q235 can be further classified into Q235A, Q235B, Q235C, and Q235D, based on its impact toughness and application requirements.

Characteristics of Q235 Steel

Q235 steel is cost-effective and widely available, making it ideal for various projects. It has high tensile strength, ensuring structural integrity and reliability. Its versatility makes it suitable for construction, engineering, and machinery applications. The steel’s good machinability allows for efficient cutting, drilling, and milling, facilitating fabrication processes. As a standardized grade equivalent to ASTM A36 in the US and S235JR in Europe, Q235 ensures consistent quality and reliable performance. Additionally, Q235 steel has excellent weldability, moderate corrosion resistance, and impact resistance, making it ideal for dynamic load conditions. Common uses include structural components, machinery parts, and construction elements.
PropertyValue (Metric)Value (Imperial)
Tensile Strength515 – 730 MPa74,700 – 105,900 psi
Yield Strength≥205 MPa≥29,700 psi
Elongation≥40%≥40%
Hardness (Brinell)≤217 HB≤217 HB
Hardness (Rockwell B)≤95 HRB≤95 HRB
Hardness (Vickers)≤225 HV≤225 HV
Elastic Modulus200 GPa29,000 ksi
PropertyMetricImperial
Density7.85 g/cm³0.284 lb/in³
Melting Point1400-1450°C2552-2642°F
Thermal Conductivity24.3 W/m·K14.1 BTU·in/hr·ft²·°F
Electrical Resistivity0.15 µΩ·m0.15 µΩ·m
Specific Heat Capacity486 J/kg·K0.116 BTU/lb·°F
Thermal Expansion Coefficient11.7 x 10⁻⁶ /°C6.5 x 10⁻⁶ /°F
PropertyValue (Metric)Value (Imperial)
Tensile Strength370-500 MPa54-73 ksi
Yield Strength235 MPa34 ksi
Vickers Hardness (HV)80-18080-180
Brinell Hardness (HB)70-16070-160
Rockwell Hardness (HRC)52-5652-56
Ductility
Toughness
Elongation20-26%20-26%
Elasticity
Elastic Modulus210 GPa30.5 Msi
ApplicationsComponents
Structural ComponentsBeams, Columns, Trusses, Brackets
Machinery PartsNuts, Connecting Rods, Bearings, Gears
ConstructionFactory Buildings, Towers, Boilers, Bridges
AutomotiveChassis, Engines, Suspension Systems, Transmissions
AerospaceFuselages, Wings, Propulsion Systems, Landing Gear
Transportation and LogisticsContainers, Railcars, Cargo Ships, Trucks

Q235 Heat Treating Instructions: Q235 steel is typically used in its as-rolled condition and does not require additional heat treatment. If necessary, normalizing can be applied to improve its grain structure and mechanical properties.

Q235 Surface Finish: The surface of Q235 steel can be treated through various methods, including painting, galvanizing, or powder coating, to enhance corrosion resistance and improve durability, especially for outdoor or exposed applications.

Custom grades can be produced upon request to meet specific requirements.

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