| Customization: | Available |
|---|---|
| Type: | Steel Coil |
| Standard: | ASTM, AISI, GB, JIS, DIN, BS |
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SAE 5160 OQ Spring Steel Φ18mm | 2M Cycles Fatigue Tested for EV Suspension Leaf Springs
High-Endurance Spring Steel for Electric Vehicle Weight and Durability Demands
MESCO STEEL's SAE 5160 oil-quenched spring steel bars deliver unmatched fatigue performance for EV leaf springs. With guaranteed 2 million cycles fatigue resistance at 800MPa stress amplitude, this Φ18mm grade enables lighter suspension designs that withstand regenerative braking loads and battery weight while outlasting conventional springs.
Key Performance Advantages
EV-Optimized Fatigue Strength
2+ Million Cycles at 800MPa (SAE J157 standard)
Microcleanliness Control: ≤0.3% inclusions (ASTM E45) preventing subsurface failure
Weight Reduction Engineering
1900 MPa Ultimate Tensile Strength: 20% higher than SAE 5160H
Fatigue Strength/Density Ratio: 15% improvement vs. 51CrV4
Corrosion Resilience
Salt Spray Resistance: 480h white rust onset (ASTM B117)
Hydrogen Embrittlement Resistance: ≤0.001% diffusible hydrogen
Technical Specifications
| Parameter | Specification |
|---|---|
| Material Standard | SAE J403 5160 (Modified) |
| Dimensions | Φ18mm ±0.12mm x 6000-12000mm |
| Heat Treatment | Oil quenched + 425°C temper |
| Hardness | 47-52 HRC |
| Surface Finish | Ground + shot peened (0.4-0.5mmA) |
| Fatigue Life Certification | 2,000,000 cycles (R=0.1, 800MPa) |
Fatigue Test Data (SAE J157 Protocol)
| Stress Amplitude | Cycles to Failure | Failure Origin |
|---|---|---|
| 700 MPa | >4,500,000 | Runout (no failure) |
| 800 MPa | 2,150,000 | Non-metallic inclusion |
| 950 MPa | 980,000 | Surface defect |
EV Suspension Application Benefits
Main Leaf Applications: Supports 550kg axle load at 40% reduced weight vs. steel
Regenerative Braking Loads: Withstands 0.5g deceleration cyclic stresses
Battery Weight Compensation: 30% higher load capacity than standard 5160
Corrosion Protection: Chromium oxide layer resorts battery electrolyte splashes
Competitive Comparison
| Property | SAE 5160 OQ Modified | 51CrV4 (EN) | SUP9A (JIS) |
|---|---|---|---|
| Fatigue Life @ 800MPa | 2,000,000 cycles | 1,200,000 cycles | 1,700,000 cycles |
| Weight Saving Potential | 25% vs. standard | 15% | 20% |
| Corrosion Resistance | 3x 51CrV4 | Baseline | 2x 51CrV4 |
| Cost per Meter | $18.50 | $22.80 | $20.10 |
Fabrication Guidelines
Cutting: Abrasive waterjet only (thermal cutting prohibited)
Heat Treatment: Not permitted post-peening (max 220°C exposure)
Shot Peening: Almen intensity 0.45A (SAE J442)
Forming: Minimum bend radius = 3x diameter (cold forming)
Quality Assurance
Certification: EN 10204 3.2 with hydrogen content report
Testing:
Hardness mapping (every 200mm)
Residual stress analysis (XRD, min -450MPa compressive)
Decarburization check: ≤0.05mm depth (ISO 3887)
Tolerances:
Diameter: Φ18 +0.10/-0.08mm
Straightness: ≤0.5mm/m
Specify SAE 5160 OQ Because:
Certified 2M Fatigue Cycles - Matches EV design life requirements
15% Weight Reduction - Extends battery range per km
Zero Hydrogen Embrittlement - Safe for electro-coating processes
IP67 Corrosion Resistance - Withstands road salt and battery chemicals
Request EV Spring Design Guide + Fatigue Test Videos
Engineering Support Services
FEA-based leaf spring optimization (Ansys/LS-DYNA)
Material substitution analysis (vs. composites)
Corrosion mapping for specific electrolyte exposure
Prototype testing on multi-axial rigs
Certifications
IATF 16949 | ISO 14241 (Fatigue Testing) | REACH SVHC Compliant
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