Sheet Metal Knowledge Sharing

Material: Iron Sheet Characteristics

 Become a Metal Connoisseur with this Article! - Did you learn about the various types of sheet metal used in mechanical fabrication?



When people think of sheet metal, the first impression is often that it rusts if left unpainted for too long. However, did you know that different post-processing treatments can delay rusting and give sheet metal different names? "SPHC Hot-Rolled Steel," "SPCC Cold-Rolled Steel," "SECC Galvanized Steel," and "SGCC Hot-Dip Galvanized Steel" are all examples of sheet metal with different functions after undergoing various post-processing treatments. 



 SPHC Hot-Rolled Steel  

This steel plate is processed through high-temperature elongation treatment. It has a distinct appearance with a black carbonization layer, making it less susceptible to welding or spot welding. Before painting, it requires a film treatment to remove the carbonization layer. 


  Material Characteristics: Mostly used for thick plates with a rough surface, commonly employed for products or structural components where appearance is less critical.

Common Thickness: 2.0mm ~ 12.0mm

Common Surface Treatments: Painting, Electroplating



SPCC Cold-Rolled Steel

It is a widely recognized and commonly used cold-rolled steel plate in the market. It is obtained through film processing and a series of professional cold-rolling processes from the 'SPHC hot-rolled steel plate.


 Material Characteristics: Its formability, smooth surface, and moderate strength make it suitable for a wide range of uses where precision forming, aesthetic appearance, and structural integrity are important factors.

 Common Thickness: 0.5mm ~ 3.2mm

 Common Surface Treatments: Painting, Electroplating


SECC Galvanized Steel


SECC refers to galvanized steel, which is produced by electrifying the surface of "SPCC Cold-Rolled Steel" to apply a zinc coating. This provides rust resistance, corrosion resistance, and acid resistance. This type of sheet metal is commonly used in the electronics industry, such as for computer casings.


Material Characteristics: It has an attractive appearance with good paint adhesion. Mostly used in communication or PC-related products. One drawback is that cut edges are not protected by the zinc coating and are prone to rusting.

Common Thickness: 0.5 ~ 2.0 mm

Common Surface Treatments: Bare material or painting



SGCC Hot-Dip Galvanized Steel


SGCC material is produced by immersing SPCC or SPHC steel plates into a hot-dip galvanizing bath, resulting in a thicker zinc coating with different surface appearances: 1. Super smooth surface (no flower pattern) 2. Regular zinc flower pattern (large flower) 3. Fine zinc flower pattern (small flower).


 Material Characteristics: It offers better rust resistance and corrosion resistance compared to SECC galvanized steel. Mostly used in household appliances such as refrigerators, washing machine components, or other exterior accessories. 

Common Thickness:

(no flower pattern) 1.0 ~ 1.2 mm

(Regular SGCC) 1.6 ~ 4.0 mm

Common Surface Treatments: Bare material