Optimization of Continuous Casting for Preventing Surface Peeling Defects on Titanium-Containing Ferrite Stainless...

Area of Science:

• Materials Science
• Metallurgical Engineering

Background:

• Cold-rolled titanium-containing ferrite stainless steel (TCFSS) strips often exhibit surface peeling due to inclusions during hot rolling.
• Clogging of the submerged entrance nozzle is a common issue in the production of these steel strips.

Purpose of the Study:

• To identify and optimize casting parameters to prevent peeling defects and nozzle clogging in TCFSS production.
• To determine the specific conditions that mitigate cracking near slab inclusions.

Main Methods:

• The Taguchi method was employed to systematically investigate the influence of casting parameters.
• Key parameters optimized included degree of casting overheating, casting speed, stirring time, and inclination angle.

Main Results:

• Increasing overheating degree and decreasing casting speed were found to prevent nozzle clogging.
• Optimal parameters (A3B1C3D2) reduced clog thickness to <1.5 mm (60°C overheating, 0.80 m/min speed, 12.0s stirring, 6.0° inclination).
• Optimal parameters (A3B1C1D3) prevented peeling defects (60°C overheating, 0.80 m/min speed, 10.0s stirring, 6.2° inclination).

Conclusions:

• The optimized casting parameters effectively eliminated peeling defects on TCFSS strips.
• The produced TCFSS strips met all mechanical property requirements, including tensile strength, yield strength, elongation, and hardness.