YB/T 4675 Precision Seamless Steel Tubes For Motorcycle Shock Absorber
YB/T 4675 Precision Seamless Steel Tubes For Motorcycle Shock Absorber
Material
YB/T 4675 specifies precision seamless steel tubes that are particularly used in motorcycle shock absorbers. These tubes are manufactured from specially selected steel grades designed to provide excellent strength, wear resistance, and fatigue performance which are critical for the demanding environment of shock absorbers.
The materials generally include alloy steels with controlled composition to ensure the high mechanical properties and precision dimensions required.
Specification
- Standard: YB/T 4675
- Type: Precision seamless steel tubes
- Application: Motorcycle shock absorbers
- Dimensions: Various diameters and wall thicknesses as per design requirements with tight tolerances
- Surface finish: Smooth, requiring minimal further machining
- Heat treatment: Usually normalized or quenched & tempered to achieve desired mechanical properties
Chemical Composition
| Element | Content (%) Range |
|---|---|
| C | 0.15 – 0.25 |
| Si | 0.10 – 0.35 |
| Mn | 0.50 – 0.90 |
| S | ≤ 0.035 |
| P | ≤ 0.035 |
| Cr | 0.30 – 0.70 |
| Ni | 0.30 – 0.60 |
| Mo | 0.10 – 0.25 |
| V | 0.05 – 0.15 |
Mechanical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength | 600 – 850 MPa |
| Yield Strength | ≥ 450 MPa |
| Elongation (A5) | ≥ 15% |
| Hardness (HB) | 180 – 230 HB |
| Impact Toughness | ≥ 30 J (at room temperature) |
Key Features
- High Strength and Toughness: Designed to withstand the cyclic loads experienced by motorcycle shock absorbers.
- Precision Dimensional Control: Ensures exact fitment and smooth operation in hydraulic shock assemblies.
- Excellent Surface Quality: Reduces the need for further surface finishing and machining.
- Good Wear and Fatigue Resistance: Increases service life under harsh operating conditions.
- Heat Treatable: Allows for optimization of mechanical properties through controlled thermal processes.
Application
YB/T 4675 precision seamless steel tubes are primarily used in the manufacturing of motorcycle shock absorbers, including:
- Hydraulic shock absorber tubes
- Suspension components requiring high fatigue resistance
- Other precision tubular components exposed to repeated mechanical stress
These tubes contribute to the durability and safety of motorcycles by supporting smooth suspension performance.
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| YB/T 4675 | ASTM A519 (Alloy Steel Tubes) |
| EN 10305-1 (Steel tubes for precision applications) | |
| JIS G3445 (Steel Tubes for Machinery Structural Purposes) |
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