What are the common specifications for Q235 steel coils?
Hot-rolled: Thickness 1.2–25.4mm, Width 1000/1250/1500mm.
Cold-rolled: Thickness 0.5–3.0mm, Width 1000/1250mm.
What is the role of Si content?
Deoxidation, strengthening; excessively high (>0.35%) reduces plasticity and weldability.
What is the role of Mn content?
Deoxidation and desulfurization, grain refinement, improved strength and toughness; ≤1.40% prevents embrittlement.
What are the hazards of S/P?
S: Hot brittleness (high-temperature cracking), the lower the better.
P: Cold brittleness (low-temperature cracking), the lower the better.
Is Q235 low-carbon steel?
Yes, C≤0.22%; characteristics of low-carbon steel: good plasticity, easy welding, moderate strength.