E355 Black Nitride Salt Bath Honed Barrel
E355 Black Nitride Salt Bath Honed Barrel
E355 Black Nitride Salt Bath Honed Barrel is a high-performance precision tube known for its excellent wear resistance, corrosion resistance, and fatigue strength. It is widely used in hydraulic cylinders, pneumatic systems, and other high-stress mechanical applications.
The E355 Black Nitride Salt Bath Honed Barrel is an advanced alternative to traditional chrome-plated tubes, offering superior durability, corrosion resistance, and performance in demanding environments. It is increasingly preferred in industries where reliability and longevity are critical.
Advantages
1. High Precision: The honing process ensures tight dimensional tolerances and a smooth surface finish.
2. Excellent Surface Finish: The inner surface is honed to reduce friction and wear, making it ideal for hydraulic and pneumatic systems.
3. Higher Fatigue Strength: The nitriding process of E355 black nitride salt bath honed barrel improves surface compressive stress, reducing crack initiation under cyclic loads.Ideal for high-pressure hydraulic systems.
4. Superior Wear Resistance: The salt bath nitriding process creates an ultra-hard surface layer, significantly extending service life.Outperforms traditional hard chrome plating in abrasive environments.
5. Seamless Construction: The seamless nature of the tube ensures uniformity and reliability in high-pressure applications.
6. Cost-Effective Long-Term Performance: Longer lifespan = fewer replacements & maintenance downtimes.Performs well in extreme conditions (heat, moisture, heavy loads), reducing operational costs.
7. Versatility: Suitable for a wide range of applications, including hydraulic cylinders, pneumatic cylinders, and precision engineering components.
Comparison vs. Chrome-Plated Tubes
Feature | Black Nitride (QPQ) Honed Tube | Chrome-Plated Tube |
Hardness | 60–70 HRC (nitride layer) | 55–65 HRC (chrome) |
Corrosion Resistance | Excellent (better than chrome) | Good, but prone to peeling |
Friction | Lower (smoother honed surface) | Higher (micro-cracks) |
Material Composition
| Element | Composition |
|---|---|
| Carbon (C) | ≤ 0.22% |
| Silicon (Si) | ≤ 0.55% |
| Manganese (Mn) | 1.00 – 1.60% |
| Phosphorus (P) | ≤ 0.025% |
| Sulfur (S) | ≤ 0.025% |
| Iron (Fe) | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength | ≥ 450 MPa |
| Tensile Strength | ≥ 580 MPa |
| Elongation | ≥ 10% |
Delivery Conditions
| Designation | Symbol | Description |
| Cold finished (hard) | BK | Tubes do not undergo heat treatment following the final cold forming and thus have a rather high resistance to deformation. |
| Cold finished (soft) | BKW | The final heat treatment is followed by cold drawing involving limited deformation.Appropriate further processing allows a certain degree of cold forming(e.g.bending,expanding). |
| Cold finished and stress-relieved | BKS | Heat treatment is applied following the last cold forming process.Subject to appropriate processing conditionsthe increase in the residual stresses involved enables both forming and machining to a certain degree. |
| Annealed | GBK | The last cold forming process is followed by annealing in a controlled atmosphere |
| Normalized | NBK | The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere. |
Delivery Condition: SR,BK, BK+S, GBK, NBK
ID Size : 20mm – 1500mm
Length: max 16m
Type: Seamless, Hot Rolled, Cold Rolled, Cold Drawn
Straightness: ≤ 0.5/1000
Roughness: 0.2-0.4 u
Tolerance EXT: DIN2391, EN10305, GB/T 1619,GOST 8731,GOST 1050,GOST4543
Tolerance INT: H7,H8,H9
Protection: Anti-rust oil on inside and outside surface, plastic caps in both ends.
Packing: Bundle with steel strip and PE sheet or Plywood case
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