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Steel for high-pressure oil spraying pipe of diesel engine, high-pressure oil spraying pipe and manufacturing method thereof

A technology of high-pressure fuel injection and manufacturing method, applied in the field of high-pressure fuel injection pipe and its manufacture, and steel for high-pressure fuel injection pipe of diesel engine, can solve the control of ignoring inclusions and the quality control method of inner surface, the results are unconvincing, no ask questions, etc.

Inactive Publication Date: 2016-06-08
SHUANGLI HENGTONG NEW MATERIAL TECH HUAIAN
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The scope of the alloy system of this patent is also too broad. The fluctuation range of the yield strength of the given examples A1-A7 is between 628MPa-758MPa. The patent only proposes to manufacture seamless steel pipes with a yield strength greater than 600MPa, but does not propose Which fuel injection pressure level condition is used for the product of this invention, and at the same time, this invention ignores the control of inclusions and the quality control method of the inner surface, obviously the result of this invention is not convincing

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  • Steel for high-pressure oil spraying pipe of diesel engine, high-pressure oil spraying pipe and manufacturing method thereof

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Embodiment Construction

[0062] Follow the steps below to manufacture 6.35×3 high-pressure oil pipes, the specific steps include:

[0063] (1) Smelting and making tube blanks;

[0064] (2) Cold drawing in the middle pass, high temperature normalizing or high temperature annealing is carried out between the cold drawing passes of the tube blank;

[0065] (3) The final continuous cold drawing, the process parameters are shown in Table 2, and the drawing pass can be selected according to the elongation coefficient R;

[0066]

[0067] (4) Stress relief annealing, the temperature is 500°C~700°C, and the time is 30~60 minutes.

[0068] The present invention provides the required minimum value of the yield strength of the steel pipe under different oil injection working pressure conditions: yield strength / working pressure ≥ 3.65 and the minimum steel pipe yield strength limit under different working pressure conditions given in Table 1, and simultaneously provides The calculation formulas for the incre...

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Abstract

The invention discloses steel for a high-pressure oil spraying pipe of a diesel engine. The steel comprises the following chemical elements in percentage by mass: 0.18-0.20% of C, 0.20-0.30% of Si, 1.40-1.60% of Mn, S not more than 0.003%, P not more than 0.010%, 0.015-0.025% of Nb, 0.02-0.04% of V, 0.02-0.03% of Al, 0.02-0.03% of Ti, Ca not more than 0.002%, N less than 0.003%, H less than 0.0002%, O less than 0.0005%, and the balance of Fe and inevitable impurities. Correspondingly, the invention further discloses the high-pressure oil spraying pipe manufactured by the steel and a manufacturing method. The high-pressure oil spraying pipe, disclosed by the invention, can be used under a working pressure above 160 MP.

Description

technical field [0001] The invention relates to a steel, in particular to a steel for a high-pressure fuel injection pipe of a diesel engine, a high-pressure fuel injection pipe and a manufacturing method thereof. Background technique [0002] High-pressure precision steel pipes are mainly used in high-power-density engines. By developing a high-pressure fuel injection system with continuously increasing injection pressure, not only the performance of diesel engines is improved, but also the emission of harmful substances is reduced to meet the increasingly stringent environmental regulations. The working pressure of the high-pressure oil pipes that meet Euro III and IV emission standards reaches 160MPa and 180MPa respectively. In 2015, my country's diesel engine began to implement the National IV standard (equivalent to the Euro IV emission standard). The diesel engine emission standard was raised from the National III to the National IV standard, and its particulate emissi...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C38/14C22C38/04C22C38/02C21D8/10
CPCC22C38/12C21D8/105C22C38/001C22C38/002C22C38/02C22C38/04C22C38/14
Inventor 杨忠民韩建淮
Owner SHUANGLI HENGTONG NEW MATERIAL TECH HUAIAN