What are the chemical composition requirements for Q195 (for nails)?
C≤0.12%, Si≤0.30%, Mn≤0.50%, P≤0.035%, S≤0.040%; low P/S ratio ensures toughness and cold workability.
What are the mechanical properties of Q195 (key indicators for nail production)?
Yield strength ≥195MPa, tensile strength 315–430MPa, elongation after fracture ≥33% (t≤16mm); elongation determines whether cracking occurs during wire drawing/capping.
What is the significance of Q195's cold bending performance for nail manufacturing?
No cracking during 180° cold bending (d=0a) ensures stability in processes such as wire drawing, flattening, capping, and bending, reducing wire breakage/scrap.
What hardness is suitable for Q195 for nails? Hot-rolled HB is approximately 100–120, cold-drawn HB is 140–180; moderate hardness, easy to drive nails into wood, not easily bent, and not easily chipped.
Q195 Does weldability affect the nail?
Low carbon equivalent, good weldability; mainly used for welding cap nails/combination nails; ordinary round nails do not require welding.