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China, Chinese 65mn/60si2mna High-Performance Spring Steel - Superior Elasticity & Fatigue Resistance for Automotive Suspensions, Industrial Springs, and Mechanical Components1 Industrial Products Supplier Manufacturer Details, price list catalog:
China Industrial Products Supplier Manufacturer List Catalog
Steel ProductsSteel Sheet PlateIndustrial Springsand Mechanical ComponentsHigh-Carbon Spring Steel65mn/60si2mna
Dalian Times Steel Co., Ltd.
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Product Description SAE 5160 OQ Spring Steel Φ18mm | 2M Cycles Fatigue Tested for EV Suspension Leaf SpringsHigh-Endurance Spring Steel for Electric Vehicle Weight and Durability DemandsMESCO 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 AdvantagesEV-Optimized Fatigue Strength2+ Million Cycles at 800MPa (SAE J157 standard)Microcleanliness Control: ≤0.3% inclusions (ASTM E45) preventing subsurface failureWeight Reduction Engineering1900 MPa Ultimate Tensile Strength: 20% higher than SAE 5160HFatigue Strength/Density Ratio: 15% improvement vs. 51CrV4Corrosion ResilienceSalt Spray Resistance: 480h white rust onset (ASTM B117)Hydrogen Embrittlement Resistance: ≤0.001% diffusible hydrogenTechnical SpecificationsParameterSpecificationMaterial StandardSAE J403 5160 (Modified)DimensionsΦ18mm ±0.12mm x 6000-12000mmHeat TreatmentOil quenched + 425°C temperHardness47-52 HRCSurface FinishGround + shot peened (0.4-0.5mmA)Fatigue Life Certification2,000,000 cycles (R=0.1, 800MPa)Fatigue Test Data (SAE J157 Protocol)Stress AmplitudeCycles to FailureFailure Origin700 MPa>4,500,000Runout (no failure)800 MPa2,150,000Non-metallic inclusion950 MPa980,000Surface defectEV Suspension Application BenefitsMain Leaf Applications: Supports 550kg axle load at 40% reduced weight vs. steelRegenerative Braking Loads: Withstands 0.5g deceleration cyclic stressesBattery Weight Compensation: 30% higher load capacity than standard 5160Corrosion Protection: Chromium oxide layer resorts battery electrolyte splashesCompetitive ComparisonPropertySAE 5160 OQ Modified51CrV4 (EN)SUP9A (JIS)Fatigue Life @ 800MPa2,000,000 cycles1,200,000 cycles1,700,000 cyclesWeight Saving Potential25% vs. standard15%20%Corrosion Resistance3x 51CrV4Baseline2x 51CrV4Cost per Meter$18.50$22.80$20.10Fabrication GuidelinesCutting: 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 AssuranceCertification: EN 10204 3.2 with hydrogen content reportTesting:Hardness mapping (every 200mm)Residual stress analysis (XRD, min -450MPa compressive)Decarburization check: ≤0.05mm depth (ISO 3887)Tolerances:Diameter: Φ18 +0.10/-0.08mmStraightness: ≤0.5mm/mSpecify SAE 5160 OQ Because:Certified 2M Fatigue Cycles - Matches EV design life requirements15% Weight Reduction - Extends battery range per kmZero Hydrogen Embrittlement - Safe for electro-coating processesIP67 Corrosion Resistance - Withstands road salt and battery chemicalsRequest EV Spring Design Guide + Fatigue Test VideosEngineering Support ServicesFEA-based leaf spring optimization (Ansys/LS-DYNA)Material substitution analysis (vs. composites)Corrosion mapping for specific electrolyte exposurePrototype testing on multi-axial rigsCertificationsIATF 16949 | ISO 14241 (Fatigue Testing) | REACH SVHC CompliantCompany profile
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