A hydraulic tube with the designation EN 10305-4 E235 and a black phosphate coating is designed for precision applications in hydraulic and pneumatic systems. The black phosphate coating enhances corrosion resistance and may provide other benefits to the performance of the tube in specific environments.

 

   - EN 10305-4 is part of the European standards, specifying requirements for seamless, cold-drawn welded carbon steel tubes used in hydraulic and pneumatic systems. This standard encompasses various material grades, with E235 being a common designation.

 

   - The chemical composition of E235 generally includes:

     - Carbon (C): ≤ 0.17%

     - Silicon (Si): ≤ 0.35%

     - Manganese (Mn): 0.40-1.20%

     - Phosphorus (P): ≤ 0.025%

     - Sulfur (S): ≤ 0.025%

   - Mechanical property requirements may include:

     - Tensile Strength: 360-500 N/mm²

     - Yield Strength: ≥ 235 N/mm²

     - Elongation: ≥ 25%

 

   - Black phosphating is a surface treatment method that introduces phosphorus to the surface of the tube, enhancing its corrosion resistance. This treatment is typically applied without the use of additional anti-corrosion coatings, resulting in a black appearance. Phosphating also improves the surface hardness and wear resistance of the tube.

 

   - Excellent Corrosion Resistance: Black phosphating enhances the tubes corrosion resistance, making it suitable for harsh environments.

   - Increased Surface Hardness: Phosphating treatment improves the surface hardness of the tube, increasing its wear resistance.

   - Compliance with EN 10305-4 Standard: The product meets European standards, ensuring quality and applicability.

   - Suitability for Hydraulic and Pneumatic Systems: Due to its superior performance, it is particularly suitable for hydraulic and pneumatic transmission systems.

 

   - Black phosphated hydraulic tubes find widespread applications in various sectors, including:

     - Construction Machinery: Hydraulic systems are extensively used in construction machinery, where black phosphated hydraulic tubes play a crucial role.

     - Automotive Manufacturing: Hydraulic systems in vehicles demand reliable tubing, and black phosphated hydraulic tubes meet these requirements.

     - Aerospace: In some lightweight and high-performance hydraulic systems, these tubes may find applications.