SECE Electro-galvanized Steel Sheets
SECE steel is a specific grade of electro-galvanized (EG) steel designed for Deep Drawing (Extremely High Ductility). It is part of the Japanese Industrial Standard (JIS G3313) family, which also includes common grades like SECC and SECD.
Key Characteristics
The "E" in SECE indicates its specialized mechanical properties:
1. Superior Formability: It has a significantly higher elongation rate (usually ≥ 38–43%) compared to standard SECC.
2. Low Yield Strength: This allows the metal to "flow" into complex mold shapes without cracking or tearing.
3. Smooth Finish: Like all electro-galvanized plates, it has a uniform, matte surface that is ideal for painting or powder coating.
4. Corrosion Resistance: It features a thin, electrolytic zinc layer that protects against rust through sacrificial protection.
Available range of SECE electro-galvanized steel sheets
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Item |
Nominal |
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Thickness |
0.3-3.5 |
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Width |
800-1830 |
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Length |
Steel plate |
1000-6000 |
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Steel strip |
Coil inside diameter 508,610 |
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Ask for SECE Electro-galvanized Steel Sheets Sample & Quote
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SECE electro-galvanized coating range and recommended nominal coating weight
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Coating from |
Coating type |
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Pure zinc coating (single-side) g/m² |
Zinc-nickel alloy coating (single-side) g/m² |
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Uniform thickness |
3~90 |
10~40 |
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Different thickness |
3~90, the maximum difference value between both sides is 40. |
10~40, the maximum difference value between both sides is 20. |
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Single side |
10~110 |
10~40 |
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Note: The weight of 50g/m²of pure zinc coating is equal to about 7.1um, and the weight of 50g/m² of zinc-nickel alloy coating is equal to about 6.8um. |
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Get SECE Steel specifications sheet
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Coating form |
Coating type |
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Pure zinc coating (single-side) g/m² |
Zinc-nickel alloy coating (single-side) g/m² |
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Uniform thickness |
10/10, 20/20, 30/30, 40/40, 50/50, 70/70, 90/90 |
10/10, 20/20, 30/30, 40/40 |
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Difference thickness |
10/30, 20/40, 30/50, 40/60, 50/70, 60/90 |
10/20, 15/25, 25/30, 30/40 |
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Single side |
10/0, 20/0, 30/0, 40/0, 50/0, 60/0, 70/0, 80/0, 90/0, 100/0, 110/0 |
10, 15, 20, 25, 30, 40 |
Comparison with Other Grades
To understand where SECE fits, it helps to see it in the hierarchy of JIS G3313 grades:
| Grade | Base Metal | Quality Level | Primary Use Case |
| SECC | SPCC | Commercial Grade | Simple bending, flat panels, computer cases. |
| SECD | SPCD | Drawing Grade | Moderate stamping, shallow bowls, rounded covers. |
| SECE | SPCE | Deep Drawing Grade | Deep stamps, multi-axis curves, fuel tanks. |
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Surface Quality
| Parameter | SECC | SECD | SECE |
| Surface Roughness Ra | 0.4–0.8 μm | 0.3–0.6 μm | 0.15–0.4 μm |
| Surface Treatment | Ordinary chromate | Fingerprint-resistant chromate treatment | Chromium-free environmentally-friendly passivation |
| Defect Control | Slight roller marks allowed | No roller marks/zinc particles | Zero defects (AA grade) |
| Coating Adhesion | 4B (Cross-hatch method) | 5B | 5B |
Ask for SECC SECD SECE Sample & Quote
Common Applications
Because SECE can handle extreme deformation, it is used for parts where the steel must be "stretched" significantly during manufacturing:
1. Automotive: Internal panels with complex shapes, oil pans, and fuel tank components.
2. Home Appliances: Deeply recessed washing machine drums or specialized refrigerator components.
3. Electronics: Deep-drawn shielding cans or intricate battery casings.
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Additional galvanized steel grades available from GNEE Steel
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Grade |
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FAQ
1. What is SECE steel?
It is the highest Deep Drawing grade of electro-galvanized steel (JIS G3313), using SPCE as the base metal for maximum formability.
2. How does SECE differ from SECC and SECD?
SECC: Commercial grade (basic bending).
SECD: Drawing grade (moderate forming).
SECE: Deep drawing grade (extreme stretching).
3. What is the typical elongation of SECE?
It features the highest elongation rate in its class, typically ≥ 39%–43% (for 0.6mm thickness), allowing it to flow into complex molds without tearing.
4. When should I choose SECE?
Choose SECE when your part design has a high draw ratio or complex, multi-axis curves that cause SECD to crack.
5. Does SECE offer better rust protection?
Corrosion resistance depends on the zinc coating weight (e.g., 20/20 g/m²), not the grade. However, its smooth surface ensures a more uniform protective finish.
6. Is SECE a "non-aging" steel?
Yes. It is made from aluminum-killed steel, meaning it won't develop stretcher strains (Lüders lines) even after long-term storage.
7. What are the common surface finishes for SECE?
Common options include Chromated (C), Phosphated (P) for painting, and Anti-fingerprint (AF).
8. Is SECE easy to weld?
Yes, but like all EG steels, it requires higher current and pressure than uncoated steel due to the zinc layer's conductivity.
9. Which industries use SECE most?
Primarily Automotive (oil pans, fuel tanks), High-end Appliances, and Precision Electronics (deep battery casings).
10. Is SECE more expensive?
Yes. Due to the high-quality SPCE base metal and specialized annealing, it carries a price premium over SECC and SECD.
