Fine-grain anti-fatigue valve steel rod and wire and its manufacturing method

A valve steel, anti-fatigue technology, applied in the field of materials, can solve the problems of not too much deformation in each pass, obvious work hardening, high energy consumption, etc., to save energy and man-hours, improve work hardening, and high dimensional accuracy Effect

Active Publication Date: 2018-06-15
CHONGQING MATERIALS RES INST
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, it should also be noted that due to the characteristics of the valve steel material itself, the cold drawing process still needs to overcome two major difficulties: low plasticity, and the deformation of each pass should not be too large, otherwise it is easy to break during the drawing process; the work hardening is obvious , multiple tempering is required to eliminate the internal stress of processing, large energy consumption and long working hours

Method used

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  • Fine-grain anti-fatigue valve steel rod and wire and its manufacturing method
  • Fine-grain anti-fatigue valve steel rod and wire and its manufacturing method
  • Fine-grain anti-fatigue valve steel rod and wire and its manufacturing method

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Embodiment Construction

[0034] According to the proportioning described in table 1, get each component described in the present invention, prepare material described in the present invention as follows:

[0035] Table 1 chemical composition list (wt%)

[0036]

[0037]

[0038] Note: The comparative example is Ni 30, a commercially available valve steel alloy material.

[0039] 1) Preparation of electrode rod

[0040]The above components were taken according to the proportions described in Table 1, and dried at 200°C for 4 h to preheat and dry the water vapor. Put Ni, Cr, Fe, Nb, and C as bulk materials into the crucible of the furnace, vacuumize and transmit electricity, and slowly increase the transmission power as the vacuum degree increases. When the vacuum degree is better than 20Pa, the power is increased to 650kw until all the large materials are melted, and then the first refining is carried out. The refining power is 500kw, the refining time is 60min, and the vacuum degree at the fin...

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Abstract

The invention relates to a fin-grain anti-fatigue gas valve steel material, comprising the elements such as Ni, Cr, Ti, Al, Mo, Nb, Mn, C, B, Mg, Zr, N, Y and Fe. Plasticity of the gas valve steel is improved by grain refining, further grain refining is achieved by using a simple and efficient cold drawing process, plasticity index is increased by above 6-10%, gas valve elector-heading is facilitated, and the gas valve steel can meet the requirements for high strength in a stick work environment at 780-950 DEG C and for fatigue resistance under repeated flushing. Experiments show that the material has good high-temperature rotational flexural fatigue performance; high-temperature creep performance shows that the material of the invention has sufficient creep strength to prevent gas valve failure.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a fine grain anti-fatigue valve steel rod wire and a manufacturing method thereof. Background technique [0002] Air valve steel specifically refers to the alloy material used to manufacture engine intake and exhaust valves. It needs to work under the conditions of high temperature, high pressure, high erosion, high corrosion, and high frequency. Due to the harsh working conditions, the plasticity, fatigue performance, and High temperature strength, hot hardness, wear resistance, corrosion resistance and other requirements are very high, which makes the manufacture and production of valve steel highly professional. In the production process of valve steel, due to the characteristics of high hardness, low plasticity and obvious work hardening of valve steel, the production and processing of valve steel is more difficult. [0003] At present, the production of valve steel is m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/54C22C38/50C22C38/48C22C38/44C22C38/06C22C38/04C22C30/00C21D8/06C21D6/00C22F1/00
CPCC21D6/004C21D6/005C21D8/06C22C30/00C22C38/001C22C38/002C22C38/005C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/54C22F1/00
Inventor 莫燕王东哲吴畏刘海定张志国万红
Owner CHONGQING MATERIALS RES INST
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