What determines the corrosion resistance of cold-rolled round bar?
Mainly determined by the material composition (e.g., chromium and nickel oxide films formed in stainless steel), surface quality also plays a role.
How does work hardening affect performance?
Advantage: Increased strength and hardness; Disadvantage: Reduced plasticity, increasing the difficulty of subsequent processing (such as bending and cutting).
Defects and Solutions
Causes and Solutions for Surface Scratches
Causes: Rough rolls, burrs on the raw material, and trapped foreign matter. Solution: Grind the rolls, clean the raw material, and improve environmental hygiene.
Causes of Cracks in Round Bars?
Uneven heating, excessive deformation per pass, inclusions or cracks within the billet, and delayed annealing.
How to Control Dimensional Tolerances?
Regularly replace worn rolls and use an automatic gauge control (AGC) to stabilize the rolling speed.
What to Do If Surface Pitting Appears?
Check for inclusions in the raw material, adjust the reduction and rolling speed, and clean any debris adhering to the roll surface.