Steel for needle valve body of ultrahigh-pressure common-rail fuel injection system of diesel engine under severe working conditions

A fuel injection system and ultra-high pressure technology, applied in the field of alloy steel, can solve the problems of no diesel engine, unfavorable industrial safety and national defense safety, etc., and achieve the effects of good fatigue performance, excellent machining performance, and good boundary wear resistance.

Active Publication Date: 2021-02-19
江苏省无锡交通高等职业技术学校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes my country's diesel engine fuel injection system follow foreign technology from design to production and use, and there is no diesel engine production with completely independent intellectual property rights, which leads to my country's diesel engine technology being completely controlled by foreign countries, which is not conducive to my country's industry safety and national defense security.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Steel for the needle valve body of ultra-high pressure common rail fuel injection system for diesel engine, including by weight percentage: C 0.3%, Si0.8%, Mn 0.4%, S0.0 3%, P 0.022%, Cr 5.0%, V 0.9% , Mo 0.35%, Ti 0.09%, N0.020%, and the balance is Fe.

[0014] A manufacturing process of steel for a needle valve body of an ultra-high pressure common rail fuel injection system for a diesel engine, comprising the following steps:

[0015] Step 1, smelting; the molten steel is initially smelted in an electric arc furnace, the ladle of the corresponding tonnage is refined, die casting or continuous casting; casting of steel ingots during die casting, billeting of steel ingots, and 200×140mm during continuous casting 2 Qualified billets with cross-sectional size; on the ladle refining furnace whose capacity matches that of the electric furnace, the molten steel is refined to remove harmful gases and inclusions in the steel, the ladle is seated, the temperature is measured a...

Embodiment 2

[0022] Steel for the needle valve body of ultra-high pressure common rail fuel injection system for diesel engine, including by weight percentage: C 0.5%, Si1.2%, Mn 0.6%, S0.01%, P 0.012%, Cr 6.0%, V1.2% , Mo 0.4%, Ti 0.11%, N.050%, the balance is Fe.

[0023] A manufacturing process of steel for a needle valve body of an ultra-high pressure common rail fuel injection system for a diesel engine, comprising the following steps:

[0024] Step 1, smelting; carry out primary smelting of molten steel in an electric arc furnace, refining ladles of corresponding tonnage, die casting or continuous casting; pouring steel ingots during die casting, billeting of steel ingots, and 250×425mm during continuous casting 2Qualified billet with cross-sectional size; on the ladle refining furnace whose capacity matches the electric furnace, the molten steel is refined to remove harmful gases and inclusions in the steel, the ladle is seated, temperature measured, analyzed, and the argon pressure...

Embodiment 3

[0031] Steel for the needle valve body of ultra-high pressure common rail fuel injection system for diesel engine, including by weight percentage: C 0.4%, Si0.9%, Mn 0.5%, S0.02%, P≤0.015%, Cr 5.5%, V 1.1% , Mo 0.355%, Ti 0.010%, N0.030%, and the balance is Fe.

[0032] A manufacturing process of steel for a needle valve body of an ultra-high pressure common rail fuel injection system for a diesel engine, comprising the following steps:

[0033] Step 1, smelting; carry out primary smelting of molten steel in an electric arc furnace, refining ladles of corresponding tonnage, die casting or continuous casting; pouring steel ingots during die casting, billeting of steel ingots, and 300×425mm during continuous casting 2 Qualified billet with cross-sectional size; on the ladle refining furnace whose capacity matches the electric furnace, the molten steel is refined to remove harmful gases and inclusions in the steel, the ladle is seated, the temperature is measured, analyzed, and t...

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Abstract

The invention provides steel for a needle valve body of an ultrahigh-pressure common-rail fuel injection system of a diesel engine under severe working conditions. The steel comprises the following components in percentage by weight: 0.3-0.5% of C, 0.8-1.2% of Si, 0.4-0.6% of Mn, less than or equal to 0.03% of S, less than or equal to 0.022% of P, 5.0-6.0% of Cr, 0.9-1.2% of V, 0.35-0.4% of Mo, 0.09-0.11% of Ti, 0.020-0.050% of N and the balance of Fe. The steel has high strength and hardness, has better boundary wear resistance, abrasive wear resistance and adhesive wear resistance, and is suitable for severe working conditions of needle valve matching parts.

Description

technical field [0001] The invention relates to the technical field of alloy steel, in particular to a steel for a needle valve body of an ultra-high pressure common rail fuel injection system for a diesel engine under severe working conditions. Background technique [0002] Diesel engine common rail fuel injection technology has experienced three generations of development since it was invented in 1986, and has achieved rapid development in inventions such as electronic control, mechanical control, and material processing. At present, this technology has been successfully used in foreign countries with diesel engines as power It is widely used in automobiles, which is the inevitable trend of the world automobile industry to meet the increasingly stringent exhaust emission standards. my country started relatively late in this technology, and the cooperation in the entire industrial chain is poor. In recent years, large state-owned enterprises such as FAW have begun to increa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C21D8/06F02M61/10
CPCC21D8/065C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C22C38/001C22C38/60F02M61/10
Inventor 张俊
Owner 江苏省无锡交通高等职业技术学校
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