1. Material Factors（材料问题）
– Substandard Steel Quality(钢材质量不达标)
– Excessive non-metallic inclusions (非金属夹杂物过多)
– Improper carbon content (碳含量超标, C% > 0.70%)
– Uneven hardness distribution (硬度不均, HRC beyond 45-52)
Solutions:（方法）
✔ Use certified steel (65Mn/60Si2MnA)
✔ Conduct spectrometer testing on raw materials
2. Manufacturing Defects (工艺缺陷)
A. Heat Treatment Issues (热处理问题)
– Overheating during quenching(淬火温度过高 → coarse grain structure)
– Insufficient tempering(回火不充分 → residual austenite脆性)
– Improper cooling rate(冷却速率不当 → martensite cracks)
Optimal Process:
mermaid
graph LR
A[Heating: 860±10°C] –> B[Oil quenching (60-80°C)]
B –> C[Tempering: 400°C×2h]
C –> D[Shot peening]
B. Surface Treatment (表面处理缺陷)
– Insufficient shot peening coverage (<98%) → stress concentration
– Poor anti-corrosion coating** (电泳/镀锌层脱落) → stress corrosion cracking
3. Design & Structural Issues (设计问题)
Validation Methods:
– ANSYS fatigue analysis** (500,000 cycles)
– Bench test** (per QC/T 29103)
4.Usage & Environmental Factors (使用因素)
A. Overloading (超载) –Fracture near center bolt hole(中心螺栓孔周围断裂)
–Sagging” deformation** (簧片塌腰变形)
B. Road Conditions & Driving Habits — Rough terrain** (矿山/崎岖路面 → 寿命↓30-50%)
Sudden braking/acceleration** → leaf misalignment
Maintenance Tips:
✔ Check U-bolt torque every 5,000 km
✔ Avoid continuous overloading >10%
so When choosing high-quality leaf springs, make sure to recognize Changda leaf springs，we have strict inspections and are sure to provide you with high-quality services.
WeChat/whatsapp：+86 18837405116