SUS303/301 Stainless Spring Steel – Corrosion Resistance & High Elasticity for Medical Devices, Marine Applications, and Food Machinery"

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SUS303/301 Stainless Spring Steel – Corrosion Resistance & High Elasticity for Medical Devices, Marine Applications, and Food Machinery"

Customization:	Available
Type:	Steel Coil
Standard:	ASTM, AISI, GB, JIS, DIN, BS

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Product Description

Basic Info.

Model NO.

Spring Steel

Certification

ISO, RoHS, IBR

Surface Treatment

Coated

Technique

Cold Rolled

Application

Mold & Dies, Ship Plate, Boiler Plate, Container Plate, Flange Plate

Special Use

Cutting Tools, Measuring Tools, Cutters in Common Steel, High-strength Steel Plate, Wear Resistant Steel, Silicon Steel

Stock

Transport Package

Export Package

Specification

0.15-6.0mm

Origin

China

HS Code

73044130

Production Capacity

10000tons

Product Description

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

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

Company profile

Frequently Asked Questions (FAQ)

What is the certified fatigue life of the SAE 5160 OQ spring steel?

This modified SAE 5160 spring steel is certified to withstand 2,000,000 fatigue cycles under a stress amplitude of 800MPa (R=0.1) based on the SAE J157 test protocol.

How does this material help in reducing electric vehicle weight?

It offers a 1900 MPa Ultimate Tensile Strength (20% higher than standard SAE 5160H) and has a 15% better fatigue strength-to-density ratio compared to 51CrV4, enabling up to 25% weight saving potential in suspension components.

What are the cutting requirements for fabrication?

To prevent thermal damage and preserve structural integrity, cutting must be performed using abrasive waterjet only. Thermal cutting processes are strictly prohibited.

What level of corrosion protection does this spring steel provide?

It features an optimized chemical configuration that provides 480 hours of salt spray resistance (ASTM B117) before white rust onset, which is 3 times the corrosion protection performance of standard 51CrV4.

Is this material prone to hydrogen embrittlement during processing?

No. The material limits diffusible hydrogen to ≤0.001%, ensuring robust resistance to hydrogen embrittlement, making it safe for standard automotive electro-coating processes.

What post-treatments and forming parameters are allowed?

Heat treatment is not permitted post-peening, and exposure temperatures must not exceed 220°C. For cold forming, the minimum bend radius must be at least 3 times the steel bar's diameter.