1. 定义与标准
- SECC： Japanese standard (JIS) electrolytic galvanized steel sheet, substrate is SPCC cold-rolled steel, zinc layer deposited by electrolysis.
- SGCC： Japanese standard (JIS) hot-dip galvanized steel sheet, substrate is ordinary carbon steel, zinc layer formed by hot-dip process.
- SPCC： Japanese standard (JIS) cold-rolled steel sheet without galvanized layer, belongs to raw material for galvanizing.
2. Zinc layer characteristics
- SECC： Thin zinc layer (5-20μm), uniform coating, high surface finish, good weldability and paint adhesion.
- SGCC： Thick zinc layer (60-120μm), strong corrosion resistance, but slightly rough surface and low processing precision.
- SPCC： No zinc layer, poor corrosion resistance, needs additional coating or plating.
3. Surface treatment and appearance
- SECC： Smooth surface, can be degreased or chromated, suitable for secondary processing such as stamping and bending.
- SGCC： Zinc spangle or matte surface, prone to zinc layer oxidation (white rust) in humid environment.
- SPCC： Grayish white cold-rolled surface, easy to rust without protection.
4. Cost comparison
SECC > SGCC > SPCC (same thickness).
二、Application fields
1. SECC application
Precision electronic products： Computer case, mobile phone mid-frame, TV back panel (requires high surface finish and corrosion resistance).
Home appliance parts： Air conditioner indoor unit panel, washing machine control panel (good formability and paint adhesion).
2. SGCC application
Outdoor structural parts： Street lamp pole, guardrail, color steel tile (thick zinc layer, strong weather resistance).
Heavy industry equipment： Automotive chassis, container, air conditioner outdoor unit shell (high strength and impact resistance).
3. SPCC application
Galvanized substrate： Raw material for SECC/SGCC.
Non-exposed structural parts： Machinery brackets, shelf panels (low cost, surface can be sprayed or painted).
Temporary use products： Packaging materials, simple tools (no long-term corrosion resistance required).
三、Summary of selection criteria
- Prioritize SECC for precision, appearance, and indoor environment.
- Prioritize SGCC for outdoor, heavy load, and corrosion resistance.
- Prioritize SPCC for low cost, non-exposed, and secondary processing.
2. Zinc layer characteristics
- SECC： Thin zinc layer (5-20μm), uniform coating, high surface finish, good weldability and paint adhesion.
- SGCC： Thick zinc layer (60-120μm), strong corrosion resistance, but slightly rough surface and low processing precision.
- SPCC： No zinc layer, poor corrosion resistance, needs additional coating or plating.
3. Surface treatment and appearance
- SECC： Smooth surface, can be degreased or chromated, suitable for secondary processing such as stamping and bending.
- SGCC： Zinc spangle or matte surface, prone to zinc layer oxidation (white rust) in humid environment.
- SPCC： Grayish white cold-rolled surface, easy to rust without protection.
4. Cost comparison
SECC > SGCC > SPCC (same thickness).
二、Application fields
1. SECC application
Precision electronic products： Computer case, mobile phone mid-frame, TV back panel (requires high surface finish and corrosion resistance).
Home appliance parts： Air conditioner indoor unit panel, washing machine control panel (good formability and paint adhesion).
2. SGCC application
Outdoor structural parts： Street lamp pole, guardrail, color steel tile (thick zinc layer, strong weather resistance).
Heavy industry equipment： Automotive chassis, container, air conditioner outdoor unit shell (high strength and impact resistance).
3. SPCC application
Galvanized substrate： Raw material for SECC/SGCC.
Non-exposed structural parts： Machinery brackets, shelf panels (low cost, surface can be sprayed or painted).
Temporary use products： Packaging materials, simple tools (no long-term corrosion resistance required).
三、Summary of selection criteria
- Prioritize SECC for precision, appearance, and indoor environment.
- Prioritize SGCC for outdoor, heavy load, and corrosion resistance.
- Prioritize SPCC for low cost, non-exposed, and secondary processing.
3. Surface treatment and appearance
- SECC： Smooth surface, can be degreased or chromated, suitable for secondary processing such as stamping and bending.
- SGCC： Zinc spangle or matte surface, prone to zinc layer oxidation (white rust) in humid environment.
- SPCC： Grayish white cold-rolled surface, easy to rust without protection.
4. Cost comparison
SECC > SGCC > SPCC (same thickness).
二、Application fields
1. SECC application
Precision electronic products： Computer case, mobile phone mid-frame, TV back panel (requires high surface finish and corrosion resistance).
Home appliance parts： Air conditioner indoor unit panel, washing machine control panel (good formability and paint adhesion).
2. SGCC application
Outdoor structural parts： Street lamp pole, guardrail, color steel tile (thick zinc layer, strong weather resistance).
Heavy industry equipment： Automotive chassis, container, air conditioner outdoor unit shell (high strength and impact resistance).
3. SPCC application
Galvanized substrate： Raw material for SECC/SGCC.
Non-exposed structural parts： Machinery brackets, shelf panels (low cost, surface can be sprayed or painted).
Temporary use products： Packaging materials, simple tools (no long-term corrosion resistance required).
三、Summary of selection criteria
- Prioritize SECC for precision, appearance, and indoor environment.
- Prioritize SGCC for outdoor, heavy load, and corrosion resistance.
- Prioritize SPCC for low cost, non-exposed, and secondary processing.
4. Cost comparison
SECC > SGCC > SPCC (same thickness).
二、Application fields
1. SECC application
Precision electronic products： Computer case, mobile phone mid-frame, TV back panel (requires high surface finish and corrosion resistance).
Home appliance parts： Air conditioner indoor unit panel, washing machine control panel (good formability and paint adhesion).
2. SGCC application
Outdoor structural parts： Street lamp pole, guardrail, color steel tile (thick zinc layer, strong weather resistance).
Heavy industry equipment： Automotive chassis, container, air conditioner outdoor unit shell (high strength and impact resistance).
3. SPCC application
Galvanized substrate： Raw material for SECC/SGCC.
Non-exposed structural parts： Machinery brackets, shelf panels (low cost, surface can be sprayed or painted).
Temporary use products： Packaging materials, simple tools (no long-term corrosion resistance required).
三、Summary of selection criteria
- Prioritize SECC for precision, appearance, and indoor environment.
- Prioritize SGCC for outdoor, heavy load, and corrosion resistance.
- Prioritize SPCC for low cost, non-exposed, and secondary processing.
2. SGCC application
Outdoor structural parts： Street lamp pole, guardrail, color steel tile (thick zinc layer, strong weather resistance).
Heavy industry equipment： Automotive chassis, container, air conditioner outdoor unit shell (high strength and impact resistance).
3. SPCC application
Galvanized substrate： Raw material for SECC/SGCC.
Non-exposed structural parts： Machinery brackets, shelf panels (low cost, surface can be sprayed or painted).
Temporary use products： Packaging materials, simple tools (no long-term corrosion resistance required).
三、Summary of selection criteria
- Prioritize SECC for precision, appearance, and indoor environment.
- Prioritize SGCC for outdoor, heavy load, and corrosion resistance.
- Prioritize SPCC for low cost, non-exposed, and secondary processing.
- Prioritize SECC for precision, appearance, and indoor environment.
- Prioritize SGCC for outdoor, heavy load, and corrosion resistance.
- Prioritize SPCC for low cost, non-exposed, and secondary processing.