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Standard and Specification:
SAE J529 is the standard specification for high-pressure fuel injection lines.
It outlines the requirements for the materials, dimensions, and performance of the tubing used in high-pressure fuel injection systems.
Material Composition:
Cold drawn annealed low carbon seamless steel is the primary material specified.
Low carbon content ensures good weldability and formability.
Seamless construction ensures uniformity and strength throughout the tube.
Manufacturing Process:
Cold drawing process: The steel tube is drawn through a die at room temperature, resulting in improved dimensional accuracy, surface finish, and mechanical properties.
Annealing process: After cold drawing, the tube is annealed (heated and slowly cooled) to relieve internal stresses and improve ductility.
Mechanical Properties:
Tensile strength: Typically specified to meet certain minimum requirements, ensuring the tube can withstand high-pressure conditions without failure.
Yield strength: Indicates the point at which permanent deformation begins under tension.
Elongation: Measures the ability of the material to stretch before breaking, indicating its ductility.
| Property | Minimum Value | Typical Value | Maximum Value |
|---|---|---|---|
| Tensile Strength | 414 MPa (60 ksi) | 483 MPa (70 ksi) | 586 MPa (85 ksi) |
| Yield Strength | 276 MPa (40 ksi) | 310 MPa (45 ksi) | 414 MPa (60 ksi) |
| Elongation (in 50mm) | 20% | 25% | 30% |
| Hardness (Rockwell B) | 65 HRB | 70 HRB | 80 HRB |
Dimensions:
Outer diameter (OD) and wall thickness: Specified within certain tolerances to ensure compatibility with fittings and connectors in the fuel injection system.
Length: Tubes are typically supplied in straight lengths or coils, with specified lengths as per application requirements.
Performance Requirements:
Pressure rating: Tubes must be capable of withstanding high pressures typically encountered in fuel injection systems without leakage or failure.
Compatibility: Materials and construction must be compatible with the fuel and additives used in the system, ensuring long-term reliability and performance.
Quality Control:
Testing and inspection procedures: The standard may specify certain tests such as dimensional inspection, visual inspection, mechanical testing, and pressure testing to ensure compliance with requirements.
Certification: Tubes may be required to be accompanied by certification documents verifying compliance with SAE J529 standards.
Standard and Specification:
SAE J529 is the standard specification for high-pressure fuel injection lines.
It outlines the requirements for the materials, dimensions, and performance of the tubing used in high-pressure fuel injection systems.
Material Composition:
Cold drawn annealed low carbon seamless steel is the primary material specified.
Low carbon content ensures good weldability and formability.
Seamless construction ensures uniformity and strength throughout the tube.
Manufacturing Process:
Cold drawing process: The steel tube is drawn through a die at room temperature, resulting in improved dimensional accuracy, surface finish, and mechanical properties.
Annealing process: After cold drawing, the tube is annealed (heated and slowly cooled) to relieve internal stresses and improve ductility.
Mechanical Properties:
Tensile strength: Typically specified to meet certain minimum requirements, ensuring the tube can withstand high-pressure conditions without failure.
Yield strength: Indicates the point at which permanent deformation begins under tension.
Elongation: Measures the ability of the material to stretch before breaking, indicating its ductility.
| Property | Minimum Value | Typical Value | Maximum Value |
|---|---|---|---|
| Tensile Strength | 414 MPa (60 ksi) | 483 MPa (70 ksi) | 586 MPa (85 ksi) |
| Yield Strength | 276 MPa (40 ksi) | 310 MPa (45 ksi) | 414 MPa (60 ksi) |
| Elongation (in 50mm) | 20% | 25% | 30% |
| Hardness (Rockwell B) | 65 HRB | 70 HRB | 80 HRB |
Dimensions:
Outer diameter (OD) and wall thickness: Specified within certain tolerances to ensure compatibility with fittings and connectors in the fuel injection system.
Length: Tubes are typically supplied in straight lengths or coils, with specified lengths as per application requirements.
Performance Requirements:
Pressure rating: Tubes must be capable of withstanding high pressures typically encountered in fuel injection systems without leakage or failure.
Compatibility: Materials and construction must be compatible with the fuel and additives used in the system, ensuring long-term reliability and performance.
Quality Control:
Testing and inspection procedures: The standard may specify certain tests such as dimensional inspection, visual inspection, mechanical testing, and pressure testing to ensure compliance with requirements.
Certification: Tubes may be required to be accompanied by certification documents verifying compliance with SAE J529 standards.
