What are the reasons for cracking during deep drawing of DC06?
Answer: Main reasons: ① Low r-value in the 45° direction (stress concentration); ② Uneven grain size; ③ Insufficient cold rolling reduction (<70%); ④ Low annealing temperature (insufficient recrystallization); ⑤ Excessive surface roughness (poor oil film adsorption); ⑥ Insufficient fillet radius or lubrication of the stamping die.
How to solve the cracking problem of DC06 deep drawing?
Answer: Targeted measures: ① Hot rolling: initial rolling 1000-1050℃, final rolling 900-930℃, coiling 730-750℃, using "U"-shaped cooling; ② Cold rolling: reduction rate controlled at 77%-80%; ③ Continuous annealing: annealing temperature 840℃, flattening elongation <0.4%; ④ Die: increase fillet radius, use special deep drawing oil; ⑤ Select FD (O5) surface grade.
What is the weldability of DC06? A: Excellent weldability – Ultra-low carbon content reduces the risk of welding hot cracking, aluminum deoxidation improves weld quality, and conventional methods such as arc welding, resistance welding, and gas shielded welding can be used. Post-weld mechanical property loss is minimal, and preheating is not required (for thin plates).
Can DC06 be painted or electroplated?
A: Absolutely. Its surface is smooth and flat with low impurity content. Only routine degreasing and rust removal are needed before painting/electroplating. The coating has strong adhesion, and FD(O5) grade surfaces can be directly used for electroplated parts with high appearance requirements (such as appliance housings and automotive trim).
What are the precautions for bending DC06?
A: ① Bending radius: Recommended ≥ 0.5 times the plate thickness (due to its good plasticity, it can be smaller than ordinary steel plates); ② Avoid bending at 45° (the r-value is slightly lower in this direction, making it prone to wrinkling); ③ No heat treatment is required after bending (no significant residual stress will be generated); ④ Clean surface oil before bending to prevent indentations.