What is Q235C Carbon Structural Steel

Q235C Steel is a common carbon structural steel plate, belonging to the Q235 series in the GB/T 700 standard. Q235 series steel plates are divided into Q235A, Q235B, Q235C, Q235D, etc. according to different quality grades. Among them, Q235C carbon steel is widely used in construction and engineering structures due to its high impact toughness and good welding performance.

1. Chemical composition requirements

The chemical composition of Q235C steel plate should meet the following standards (mass percentage):

Carbon (C): ≤ 0.20%

Silicon (Si): ≤ 0.35%

Manganese (Mn): 0.30-0.70%

Sulfur (S): ≤ 0.045%

Phosphorus (P): ≤ 0.045%

The remaining amount is iron (Fe)

The content of these elements ensures that Q235C steel plate has good strength and processability, while also ensuring its good toughness and weldability.

2. Mechanical performance requirements

The mechanical properties of Q235C steel plate must meet the following requirements:

Yield strength (ReL): ≥ 235 MPa

Tensile strength (Rm): 370-500 MPa

Elongation (A): ≥ 22% (thickness ≤ 16mm)

Elongation (A): ≥ 20% (thickness>16mm)

Impact toughness (AkV): ≥ 27 J (at 0 ℃)

These performance indicators ensure the safety and reliability of Q235C steel plate in practical applications.

3. Application Fields

Q235C carbon steel plate is widely used in the following fields due to its excellent comprehensive performance:

Building structure: Q235C steel plate is commonly used in building structures such as factories, bridges, high-rise buildings, etc., mainly because it has good strength and toughness.

Engineering structure: widely used in construction machinery and equipment, such as cranes, excavators, transport vehicles, etc., which require materials with good tensile strength and toughness.

Manufacturing industry: Q235C steel plate is also used to manufacture various machine and equipment components due to its ease of processing and welding.

4. Processing performance

Q235C steel plate has good processing performance and is suitable for various processing techniques:

Cutting: It can be done through methods such as flame cutting, plasma cutting, etc.

Welding: Q235C steel plate has good welding performance and can be subjected to various welding processes, such as manual arc welding, gas shielded welding, etc.

Cold processing: Cold processing techniques such as cold bending and stamping can be performed, and cracks are less likely to occur during the processing.

5. Precautions

Welding precautions: When welding Q235C carbon structural steel plates, attention should be paid to controlling the welding heat input to avoid hardening or embrittlement in the welding heat affected zone.

Anti corrosion treatment: When used in a corrosive environment, appropriate anti-corrosion treatment such as coating, galvanizing, etc. is required to extend the service life of the steel plate.