Q235 Carbon Steel

Q235 Carbon Steel is a Chinese standard carbon structural steel. Known for its excellent balance of strength and flexibility, it is widely used in construction and manufacturing. Q235 steel is easy to weld, cut, and machine, making it ideal for various applications. Its name is derived from its yield strength of 235 MPa, indicating its mechanical performance.

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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.

Chemical Compositions

Property	Value (Metric)	Value (Imperial)
Tensile Strength	515 – 730 MPa	74,700 – 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 Modulus	200 GPa	29,000 ksi

Physical Properties

Property	Metric	Imperial
Density	7.85 g/cm³	0.284 lb/in³
Melting Point	1400-1450°C	2552-2642°F
Thermal Conductivity	24.3 W/m·K	14.1 BTU·in/hr·ft²·°F
Electrical Resistivity	0.15 µΩ·m	0.15 µΩ·m
Specific Heat Capacity	486 J/kg·K	0.116 BTU/lb·°F
Thermal Expansion Coefficient	11.7 x 10⁻⁶ /°C	6.5 x 10⁻⁶ /°F

Mechanical Properties

Property	Value (Metric)	Value (Imperial)
Tensile Strength	370-500 MPa	54-73 ksi
Yield Strength	235 MPa	34 ksi
Vickers Hardness (HV)	80-180	80-180
Brinell Hardness (HB)	70-160	70-160
Rockwell Hardness (HRC)	52-56	52-56
Ductility	–	–
Toughness	–	–
Elongation	20-26%	20-26%
Elasticity	–	–
Elastic Modulus	210 GPa	30.5 Msi

Industries & Applications

Applications	Components
Structural Components	Beams, Columns, Trusses, Brackets
Machinery Parts	Nuts, Connecting Rods, Bearings, Gears
Construction	Factory Buildings, Towers, Boilers, Bridges
Automotive	Chassis, Engines, Suspension Systems, Transmissions
Aerospace	Fuselages, Wings, Propulsion Systems, Landing Gear
Transportation and Logistics	Containers, 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.