What is the carbon content range of Q235COIL?
Carbon (C): 0.14%~0.22%, low carbon content ensures good plasticity and weldability.
What are the main alloying elements?
Core elements: Manganese (Mn) 0.30%~0.70%, Silicon (Si) ≤0.35%, no precious alloying elements.
What are the requirements for sulfur and phosphorus impurity content?
Sulfur (S) ≤0.045%, Phosphorus (P) ≤0.045%, the higher the grade, the stricter the impurity control.
What are the differences in chemical composition between different quality grades?
The upper limit of impurities is the same for grades A and B; sulfur and phosphorus ≤0.040% for grades C and D, with grade D having better impact toughness.
How does carbon content affect performance?
Increased carbon content increases strength and hardness, but decreases plasticity and weldability. Q235's low-carbon design balances performance and processability.