SGEH galvanized steel (Superior Galvanized Extra-High Formability) high-strength cold-rolled galvanized steel sheet is a premium hot-dip galvanized substrate specifically designed for extreme forming operations such as deep drawing, complex stamping, and precision bending. With its optimized alloy composition and controlled coating adhesion, and excellent ductility, it has become an ideal choice for high-end manufacturing in the automotive, electronics, and sustainable construction industries.
Mechanical Properties
| Parameter | SGEH Standard Grade | SGEH Advanced Grade |
| Yield Strength (MPa) | ≥180 | ≥260 |
| Tensile Strength (MPa) | 300–420 | 400–550 |
| Elongation A50 (%) | ≥30 (t≤1.0mm) | ≥22 (t≤1.5mm) |
| Min. Bending Radius | 0.5t (all directions) | 0.8t (all directions) |
Enhanced Coating & Surface Treatments
Coating Weights:
| Code | Minimum Double-sided Coating Amount (g/m²) | Equivalent Zinc Coating Thickness (μm) | Applicable Steel Grades | Corrosion Life (Years/C3 Environment) |
| Z12 | 120 | 17 | SGHC340-SGHC590 | 12-15 |
| Z18 | 180 | 25 | SGHC340-SGHC780 | 18-20 |
| Z22 | 220 | 31 | SGAC340-SGAC590 | 22-25 |
| Z27 | 270 | 38 | SGAC440-SGAC780 | 25+ |
| ZM90 | 90 (Zn-Mg Alloy) | 15* | SGAC590+ (High-strength corrosion-resistant) | 30+ |
Surface Finishes:
| Code | Treatment Method | Coating Thickness (mg/m²) | Core Function |
| C | Chromate Passivation | 10-50 | White rust prevention (72h salt spray with no white rust) |
| N | Chromium-Free Passivation | 8-30 | Environmentally friendly rust prevention (48h salt spray with no white rust) |
| S | Self-lubricating Coating | 0.8-1.5μm | Friction coefficient reduction by 35% (prevents scratches during deep drawing) |
| A | Fingerprint-resistant Coating | 0.5-1.2μm | Anti-fingerprint contamination + maintains conductivity |
Comparison of Tensile Strength between SGEH and other Galvanized Steels
| Material Type | Typical Tensile Strength (MPa) | Forming Limit (Er) | Applicable Processes |
| SGEH50 | 400 – 550 | ≥0.70 | Deep drawing / Hydraulic forming / Complex bending |
| FS Type B (ASTM) | 450 – 600 | 0.55 – 0.65 | General bending / Shallow stamping |
| SGCC (JIS) | 270 – 420 | ≤0.60 | Simple bending / Flat sheet parts |
| DP590 (Dual-phase Steel) | 590 – 780 | ≤0.50 | High-strength structural parts (poor formability) |
Global Standard Equivalents
| ASTM | EN 10346 | JIS G 3302 | GB/T 2518 |
| SGEH40 | DX56D+Z | SGCD 570 | S280GD+ZF |
| SGEH50 | DX54D+ZF | SGCD 590 | S320GD+ZF |
Application Scenarios
SGEH Standard Grade
- Automobile anti-collision beams, A/B pillars, seat frames
- Automobile door reinforcement plates, chassis crossbeams
- Consumer electronics housings
- Precision medical device components
- Solar panel mounting clamps
- Architectural decorative components
SGEH Advanced Grade
- Electric vehicle structural reinforcement
- Aerospace piping systems
- Industrial robot housings
- Seismic structural brackets
- High-load shelves
- Wind power towers, photovoltaic brackets
Why Choose Wanzhi SGEH Galvanized Steel?
SGEH galvanized steel combines next-generation formability with proactive corrosion management. Its micro-alloyed substrate reduces springback by 40% versus conventional grades. The galvanizing facility of Wanzhi Group is certified to ISO 9001 and ISO 14001 standards. We produce galvanized steel with zinc coating weights ranging from Z20 to Z350 g/m², including galvalume steel (aluminum-zinc coated) and Zn-Al-Mg coated steel, as well as PPGI (Pre-Painted Galvanized Iron) and PPGL (Pre-Painted Galvanized Steel) with PE, SMP, HDP, PVDF, and PU coatings. Based on application requirements, we customize galvanized steel to various standards and grades such as SGCC, SGCD1/SGCD2, SGEH, DX51D, and CS Type A/B/C.
SGEH Galvanized Steel Frequently Asked Questions
Q: Can SGEH replace aluminum in lightweight designs?
A: Yes, for plates ≥0.4mm thick. SGEH has 20% higher tensile strength than 5052-H32 aluminum of equal weight.
Q: Can SGEH be welded?
A: Laser welding and resistance spot welding are recommended. Arc welding should be avoided to maintain the integrity of the galvanized coating.
Q: How does coating weight affect service life?
A: Coating weight determines the corrosion resistance of galvanized steel, and high zinc coating galvanized steel can extend service life to more than 25 years in marine environments.
Q: What is the minimum order quantity for custom widths?
A: The minimum order quantity for slitting coils with thickness of 0.12-6mm and width of 600-1250mm is 10 tons.
Contact us for full technical dossiers and certified samples. Custom alloy adjustments available for OEM projects.