We can make all types of laser cutting service, all types of materials and grades, carbon steel, alloy steel, stainless steel, galvanized steel.
Product Overview
We provide custom fiber laser cutting services for SAPH440+Z hot-dip zinc galvanized steel sheet and plate, a material specifically developed for automotive structural applications. SAPH440 is a Japanese standard (JIS G3113) hot-rolled automotive structural steel grade with excellent formability and weldability, while the +Z designation indicates a hot-dip pure zinc coating applied to both surfaces for corrosion protection.
This combination delivers the high-strength, impact-resistant substrate required for vehicle body and chassis components, paired with a sacrificial zinc barrier that protects cut edges, punched holes, and scratched surfaces from red rust during assembly, transport, and service life. Our laser cutting process is optimized to preserve the integrity of the zinc layer at cut boundaries, ensuring that automotive structural parts arrive at your press shop or welding line ready for immediate integration.
Parameter
Details
Base Steel Grade
SAPH440 (JIS G3113)
Coating Type
+Z (Hot-Dip Pure Zinc)
Coating Weight
Z80 – Z275 (80–275 g/m² total both sides)
Thickness Range
0.8mm – 12.0mm (laser cutting optimized)
Max Cutting Format
4,000mm × 2,000mm
Laser Cutting Tolerance
±0.05mm – ±0.10mm
SAPH440+Z Chemical Composition and Technical Property is as below：
Standard
C % max
Si max
Mn max
P max
S max
tensile strength（MPa）
yield strength（MPa）
Elongation%
SAPH440+Z
0.21
0.3
1.5
0.3
0.025
275-305
≥440
29-35
Typical Automotive Applications
Body-in-White (BIW) Structural Reinforcements: B-pillar reinforcements, roof rail inserts, sill panel stiffeners, and floor pan cross-members
Chassis & Suspension Components: Control arm brackets, sub-frame mounting plates, steering column support brackets, and anti-roll bar bush housings
Underbody & Closure Panels: Engine under-shields, wheel-arch liners, door inner impact beams, and hood reinforcement ribs
Battery Electric Vehicle (BEV) Components: Battery pack tray sections, module mounting rails, and high-voltage junction box brackets requiring corrosion resistance and structural rigidity
Post-Cutting Value-Added Services
Edge Sealing & Touch-Up: Zinc-rich touch-up paint or cold galvanizing compound applied to critical cut edges for extended corrosion protection in severe exposure zones.
CNC Press Forming: Brake press bending and draw-forming of laser blanks into 3D structural profiles with springback compensation calibrated for SAPH440's high-strength behavior.
Hardware Insertion: Self-piercing rivet (SPR) bushings, weld nuts, and clinch studs installed for modular assembly compatibility.
Surface Treatment: Phosphating, electro-coating (E-coat) priming, and wax injection for cavity corrosion protection.
Packaging & Delivery
Surface Protection: Protective PVC or PE film retained on exposed surfaces during cutting and packing; VCI paper interleaving between nested blanks.
Rust Prevention: Desiccant packs and moisture-barrier wrapping for ocean transit; zinc coating provides inherent protection for short-term storage.
Sequence Kitting: Blanks bagged and labeled by vehicle program, assembly station, or weld cell sequence to support just-in-time (JIT) manufacturing.
Container Loading: Steel-strapped bundles on timber skids optimized for automotive industry container stuffing standards.
Documentation: Mill test certificates (MTC), coating weight reports, inspection checklists, and material safety data sheets (MSDS) for zinc-coated products.
