Processing method of steel rod for engine fuel oil system

Abstract

The invention discloses a processing method of a steel rod for an engine fuel oil system, wherein the processing method includes the following steps: (1) preparing materials; (2) smelting and continuously casting: smelting the raw materials prepared in the step (1) through a converter or an electric furnace to obtain molten steel, then carrying out VOD refining of the molten steel in a VOD furnace, taking an iron-silicon intermediate alloy or pure aluminum as a reducing agent for deoxidization in the VOD refining process, after deoxidization, taking a calcium oxide powder and a fluorite powderas desulphurizing agents, desulphurizing, and continuously casting into a stainless steel wire rod with the diameter of 16-38 after VOD refining; (3) carrying out filming treatment; (4) drawing to the finished product specification; and (5) cleaning. The leakage problem in subsequent applications can be controlled from the source, the risk of leakage is greatly reduced, and the reliability of work of an engine is ensured. The mechanical properties comprise that the yield strength is more than or equal to 205 N / mm<2>, the tensile strength is more than or equal to 520 N / mm<2>, the elongation rate is more than or equal to 40% and the shrinkage rate of a cross section is more than or equal to 60%; the mechanical properties completely meet the processing requirements of engine fuel oil systemparts.

Description

technical field [0001] The invention relates to a processing method of a steel rod, in particular to a processing method of a steel rod used in an engine fuel system. Background technique [0002] Engine fuel system generally includes fuel filter system, fuel distribution system, fuel injection system, etc. The engine fuel system supplies a certain amount of atomized fuel to the engine according to the needs of the engine's operating conditions, and sprays it into the cylinder for combustion at high speed. The fuel distribution pipe and high-pressure fuel rail in the fuel injection system are usually made of stainless steel, which requires high pressure bearing capacity. As the implementation period of the National VI emission standard is approaching, it is the general trend to develop a fuel injection system with higher working pressure . For example, the working pressure of the in-cylinder fuel injection system of a traditional turbocharged cylinder is generally 25 MPa, ...

AI Technical Summary

Problems solved by technology

For example, the working pressure of the in-cylinder fuel injection system of a traditional turbocharged cylinder is generally 25 MPa, while the working pressure of the new generation of fuel injection system being developed in the industry is increased to 35 MPa. The existing fuel distribution pipe and high-pressure fuel rail are due to Difficult to meet such high working pressure due to risk of leakage

For fuel distribution pipes and high-pressure fuel rails, the raw material supply form is steel rods. For steel rods, their element composition and processing technology directly determine the performance of steel rods, which in turn affect the fuel oil obtained by subsequent deep processing of steel rods. Various performances including pressure bearing capacity of engine fuel system components such as distribution pipes and high-pressure fuel rails, but the existing processing technology is difficult to meet the requirements. In view of this, the invention proposes a processing of steel rods for engine fuel system method

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