Views: 0 Author: Site Editor Publish Time: 2025-03-05 Origin: Site
Diesel engine fuel injection pipe is a key component designed for high-pressure fuel delivery, widely used in all kinds of diesel engines, especially in industrial, agricultural and automotive fields. In order to meet the high pressure and accuracy requirements of diesel engine fuel injection system, cold drawn carbon seamless steel tubes are usually used, mostly made of ST35 or ST52.4. These tubes have excellent strength and durability, and are able to withstand the mechanical stresses of high-pressure fuel delivery, and at the same time provide a very high surface finish and corrosion resistance.
Diesel Engine Fuel Injection Pipe is normally supplied in 6mm OD and 2mm wall thickness, but customized sizes are available on request. The manufacturing material is cold-drawn carbon seamless steel, which is available in two main steel grades, ST35 and ST52.4. ST35 is a carbon structural steel with moderate strength, good plasticity and toughness for most diesel engine applications, while ST52.4 is a stronger structural steel that maintains excellent performance under higher operating pressures and loads. The manufacturing process of cold-drawn seamless steel pipe ensures wall uniformity and dimensional accuracy, and avoids the problem of stress concentration caused by welded seams, thus improving the reliability of the pipe.
Fuel injection tubes are usually given a BA (Bright Annealed) surface treatment, which is designed to improve the tube's finish and corrosion resistance. Bright annealing is a heat treatment process carried out in an oxygen-free or hydrogen atmosphere that creates a bright, smooth, mirror-like finish on the surface of the pipe, which further reduces frictional resistance on the inner wall of the pipe. This treatment helps to reduce pressure loss during fuel delivery and effectively prevents corrosion of the inner wall of the pipe. In addition, the BA treatment improves the oxidation resistance of the tube surface, thus extending the service life of fuel injection tubes in high temperature and high pressure environments.
The cold-drawn seamless steel pipe design and BA surface treatment of diesel engine fuel injection pipes provide several advantages:
High pressure resistance: Cold-drawn seamless steel pipe has a uniform structure and no welding seam, avoiding the defects of stress concentration and leakage that can easily occur in the welding area. ST35 and ST52.4 material grade makes it have extremely high tensile strength and pressure resistance, able to withstand the working pressure of fuel injection system in diesel engine up to about 70Mpa, ensuring the stability and reliability of fuel delivery.
Anti-corrosion performance: Bright annealing treatment not only makes the surface of the steel pipe smooth and flat, but also gives it excellent anti-corrosion performance. the dense oxide layer formed by BA treatment can effectively prevent the fuel injection pipe from oxidative corrosion when it comes into contact with diesel oil, lubricating oils and other fuels and chemicals over a long period of time, so that it can adapt to the various harsh environments in which the engine operates.
Low flow resistance: The BA surface treatment makes the inner wall of the pipe extremely smooth, which helps to reduce the resistance of fuel flow in the pipe and improve the efficiency of fuel transfer. This design not only reduces energy loss during fuel delivery, but also maintains stable pressure during the delivery process, which further ensures the accuracy of fuel injection and the combustion efficiency of the engine.
High precision and customization: The cold-drawn seamless steel pipe manufacturing process ensures the high precision of the pipe and strict control of the inner and outer diameter dimensions, which can meet the strict requirements of diesel engines for injection pipes. In addition, the outer diameter and wall thickness of the pipe can be customized to suit different models and types of diesel engines.
Long service life: the seamless steel pipe has a solid structure with excellent fatigue resistance, and can maintain stable mechanical properties under repeated high-pressure impacts. Combined with the improved corrosion resistance of the bright annealed treatment, these fuel injection tubes have a long service life and can provide reliable fuel transfer support during engine operation.
Fuel injection hoses for diesel engines are used in a wide range of applications:
Automotive diesel engines: Diesel engines in heavy-duty vehicles such as trucks, buses, and off-road vehicles require reliable fuel injection systems to meet engine efficiency and emission standards. Cold-drawn seamless steel injection tubes are able to provide stable performance over long periods of high-pressure operation.
Industrial and Construction Machinery: Large diesel engines used in agricultural machinery, construction machinery and other industrial equipment require robust fuel injection hoses that can withstand vibration, shock and high-load operation in harsh environments. Seamless injection lines ensure continuity and stability of fuel delivery.
Marine and Genset: Large marine and genset diesel engines operate in complex marine and industrial environments, and the high pressure and corrosion resistance of fuel injection hoses makes them ideal for these applications, ensuring efficient combustion and consistent output over long periods of operation.
Diesel engine fuel injection pipes made from cold drawn carbon seamless steel tubes are an indispensable key component of diesel engine fuel injection systems due to their high strength, excellent pressure resistance and corrosion resistance given by BA bright annealing treatment. With excellent pressure resistance, corrosion resistance and high precision, these tubes are widely used in diesel engines in automotive, construction machinery, marine and other industries to ensure efficient, precise and reliable fuel delivery. The customized specifications enable them to be adapted to different customer requests and widely meet a variety of industrial and engineering application scenarios. Through this structurally solid, durable and reliable design, the cold drawn carbon seamless steel fuel injection hose plays an important role in enhancing the efficiency of diesel engines and prolonging the service life of equipment.
