Preparation method of high-temperature-resistant antioxidant exhaust manifold nodular cast iron

A technology for ductile iron and exhaust manifolds, which is applied in the field of preparation of ductile iron for exhaust manifolds, can solve the problems of poor thermal strength and low cycle times of failure, and achieve improved thermal strength, high-temperature mechanical properties, and prevention of The effect of penetrating

Active Publication Date: 2014-04-23
齐齐哈尔英格机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the technical problem of poor thermal strength of the existing exhaust manifold ductile iron and the low cycle times of failure under high heat cycle temperature, and provides a preparation method of high temperature resistant and anti-oxidation exhaust manifold ductile iron

Method used

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  • Preparation method of high-temperature-resistant antioxidant exhaust manifold nodular cast iron
  • Preparation method of high-temperature-resistant antioxidant exhaust manifold nodular cast iron
  • Preparation method of high-temperature-resistant antioxidant exhaust manifold nodular cast iron

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specific Embodiment approach 1

[0013] Specific implementation mode 1: A kind of ductile cast iron for high temperature resistant and anti-oxidation exhaust manifold in this embodiment has mass fractions of 3.15% to 3.25%, 4.15% to 4.35%, 1.20% to 1.30%, 0.20% to 0.24%, 0.15% to 0.18%, 0.012% to 0.014%, 0.027% to 0.031%, 0.048% to 0.055% of C, Si, Mo, V, Mn, S, P, Mg and the rest of Fe composition; including mass The fraction is 0.019% to 0.024% of residual rare earth element Re.

specific Embodiment approach 2

[0014] Embodiment 2: A method for preparing ductile iron for high temperature and oxidation resistant exhaust manifolds of this embodiment is carried out in the following steps:

[0015] 1. Smelting molten iron: First, weigh Q12 pig iron and steel scrap according to the mass parts of Q12 pig iron and scrap steel as 70-75 and 25-30, and then calculate the ratio of the mass of ferromolybdenum alloy to the total mass of Q12 pig iron and scrap steel as ( 2~2.5): 100, according to the ratio of the mass of vanadium alloy to the total mass of Q12 pig iron and scrap steel (0.4~0.5): 100, according to the ratio of the mass of ferrosilicon alloy to the total mass of Q12 pig iron and scrap steel (2.0~ 2.3): 100, weigh ferromolybdenum alloy, vanadium alloy and ferrosilicon alloy, then add the weighed Q12 pig iron, scrap steel, ferromolybdenum alloy, vanadium alloy and ferrosilicon alloy into the intermediate frequency furnace, heat up to a temperature of 1500 ~ 1550 ℃, static Put it in pl...

specific Embodiment approach 3

[0018]Specific Embodiment 3: The difference between this embodiment and Specific Embodiment 2 is that in Step 1, the components in steel scrap and the mass fractions of each component are: C: 0.17%-0.21%, S: 0.012%-0.016%, P: 0.020% ~ 0.025%, Mn: 0.24% ~ 0.28%, Si: 0.30% ~ 0.40%, other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a high-temperature-resistant antioxidant exhaust manifold nodular cast iron, relates to the preparation method of the exhaust manifold nodular cast iron and aims to the solve the technical problems of poor heat resistance and less failure circulation time at high thermal cycling temperature of the traditional exhaust manifold nodular cast iron. The preparation method of the high-temperature-resistant antioxidant exhaust manifold nodular cast iron comprises the following steps of:1, molten iron smelting; and 2, spheroidization and inoculation treatment. According to the high-temperature-resistant antioxidant exhaust manifold nodular cast iron obtained through the preparation method, the volume fraction of ferrite reaches 95-99 percent, the tensile strength is 160N / mm<2> at high temperature of 650 DEG C, the heat resistance is good, the failure circulation time is 410-440 times at thermal cycling temperature of 500-700 DEG C, the high-temperature creep resistance and the creep-resistance breaking ability are good, and the high-temperature-resistant antioxidant exhaust manifold nodular cast iron can be applied to exhaust manifolds of automobile engines.

Description

technical field [0001] The invention relates to a method for preparing ductile iron for an exhaust manifold. Background technique [0002] In recent years, out of the consideration of protecting the environment and saving resources, new requirements have been put forward for automobile engines in terms of increasing compression ratio, improving fuel combustion efficiency and reducing emissions. In order to adapt to the application of catalytic technology and turbocharging technology, The requirement of increasing exhaust temperature of the engine has higher and higher requirements for the high temperature mechanical properties and oxidation resistance of the exhaust manifold of the automobile engine. The high temperature resistance requirement of the exhaust manifold of the automobile engine has reached about 900 ℃ in foreign countries. However, the existing exhaust manifold materials in China can only meet the use requirements when the temperature is about 750°C; with the f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/04C22C33/10
Inventor 鲍玉龙刘峰
Owner 齐齐哈尔英格机械有限公司
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