1.What are the differences in raw materials and processes between SECC and SECD?
SECC is made from a conventional cold-rolled steel sheet (SPCC) that is electrolytically galvanized. SECD, based on SPCD, is made by adjusting the chemical composition of the SECC substrate, such as reducing carbon and phosphorus content, and optimizing the annealing process.
2.What is the difference in deep drawing performance between SECC and SECD?
SECC is a common electro-galvanized steel sheet with average deep-drawing performance and an elongation of approximately 20%-25%. It is suitable for simple stamping applications, such as the production of simple structural parts like appliance and electronic equipment housings. SECD is an electro-galvanized steel sheet for deep drawing, with an elongation of over 30%. It offers excellent deep-drawing performance and is suitable for parts requiring high-strength stretch forming, such as automotive door inner panels and drums of washing machines.
3.What are the differences in mechanical properties between SECC and SECD?
SECC has relatively low mechanical properties, with neither yield strength nor tensile strength optimized. It is generally suitable for applications requiring less demanding mechanical properties. SECD typically has a yield strength of ≤280 MPa and a tensile strength of 300-400 MPa. It exhibits excellent plastic deformation resistance and can withstand significant deformation without breaking during processes such as deep drawing.
4.What is the difference in price between SECC and SECD?
Since SECD has higher requirements on substrate chemical composition and production process, its price is usually slightly higher than SECC.
5.What is the difference in corrosion resistance between SECC and SECD?
The corrosion resistance of SECC and SECD is not much different. If the coating thickness is the same, the corrosion resistance of the two is basically the same; if the coating thickness is different, the thicker the coating, the better the corrosion resistance.