What Is JIS G3302 SGCC?
JIS G3302 SGCC is a cold-rolled galvanized steel sheet and coil produced by the hot-dip galvanizing process with a conventional zinc spangle on the surface. The spangle is the visible crystalline pattern formed during solidification of the zinc layer. SGCC combines good corrosion resistance, formability and economy, and is widely used in construction, home appliances, light industry and general manufacturing.
Typical Specification Range
| Item | Typical range |
|---|---|
| Form | Steel coil |
| Thickness | 0.12-1.2 mm |
| Coating | Z120-Z275 |
| Spangle type | Regular, big, small or zero spangle |
| Grade | SGCC, CGCC, DX51D, DX52D |
| Base material | Cold-rolled coil |
| Width | 600-1500 mm or customized |
| Certificates | CE, RoHS, JIS, ISO 9001 |
Chemical Composition
The base steel of SGCC-type product is controlled to the following typical maxima: carbon 0.25%, phosphorus 0.035%, sulfur 0.035%; manganese typically 0.27-0.93%; silicon minimum 0.10%; chromium, copper and nickel up to 0.40%; molybdenum up to 0.15%; vanadium up to 0.08%. Exact values must be confirmed on the mill certificate for each heat.
Advantages of Regular Spangle
Compared with small-spangle or zero-spangle products, the production process for conventional zinc spangle coil is simpler and the price is significantly lower. The zinc coating mass provides basic protection while avoiding excessive zinc consumption, and the surface accepts conventional color coating without special treatment, keeping maintenance costs low.
Application Areas
Construction: roof and wall substrates used with color coating, ventilation ducts, light steel structure covers, temporary building enclosures and canopies.
Home appliances and furniture: refrigerator and washing machine back panels, internal structural parts, office furniture and lockers for non-exterior use.
General industry: shelves and storage equipment, cable trays, electrical box housings, agricultural greenhouse frames and livestock equipment.
FAQ
What does SGCC mean?
SGCC is a grade of hot-dip galvanized steel sheet and coil defined in JIS G3302, produced from cold-rolled base steel with a conventional zinc coating.
What is the difference between regular and zero spangle?
Regular spangle shows visible zinc crystals and costs less to produce; zero spangle has a uniform matte surface and is preferred where a smooth paint finish is required.
What coating masses are available?
Typical coating designations range from Z120 to Z275 in g/m2 total both surfaces; the choice depends on the service environment.
Can SGCC be painted?
Yes, SGCC is commonly used as a substrate for color coating; the surface should be clean and properly pretreated before painting.
Is SGCC suitable for outdoor use?
It provides good general protection, but for aggressive outdoor atmospheres a heavier coating such as Z275 or a painted surface is recommended.
What is CGCC?
CGCC is a JIS G3321 grade for color-coated galvanized steel; it uses a galvanized base with an organic paint system.