What are the main applications of SGCC in the automotive industry?
These include non-load-bearing or low-load-bearing components such as chassis protection plates, fuel tank brackets, seat sliding brackets, door inner panels, hood inner panels, exhaust system guards, and interior metal frames.
Why is SGCC not used in critical automotive structural components (such as the body frame)?
SGCC has a yield strength of only 205MPa, which cannot meet the high strength requirements for vehicle collision safety. Critical structural components must use SGC340 or higher high-strength galvanized steel or high-strength steel.
What are the roles and limitations of SGCC in automotive lightweight design?
It can achieve component lightweighting through reasonable thickness design, replacing some cast iron parts, but its low strength limit prevents its use in high-strength lightweight structures. It is only suitable for non-critical lightweight components.
What are the selection criteria for the galvanized layer of SGCC used in automobiles?
For interior and exterior parts, choose 60-120g/m²; for easily corroded parts such as the chassis and exhaust panels, choose 180-275g/m². Vehicles in coastal areas require additional coating thickness or the addition of an anti-corrosion coating.
What are the challenges and solutions in the forming process of SGCC automotive parts?
During deep drawing, the zinc layer is prone to cracking, requiring control of stamping speed and die radius. During bending, the outer zinc layer is prone to peeling; the minimum bending radius should be ≥3T (T is the plate thickness). Thicker coatings require a larger bending radius.