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Austenite heat-resisting cast steel exhaust manifold and casting process thereof

A technology of heat-resistant cast steel and exhaust manifolds, which is applied in the field of automobile exhaust manifold manufacturing, can solve the problems of huge process difficulty and poor fluidity exhaust manifolds, and achieve reduced costs, good mechanical properties, and reduced The effect of wall thickness

Active Publication Date: 2014-06-04
西峡县内燃机进排气管有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to factors such as the poor fluidity of austenitic heat-resistant cast steel and the special structure of the exhaust manifold, the application of austenitic heat-resistant cast steel on the exhaust manifold has great technical difficulties, and it is still blank in China.

Method used

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  • Austenite heat-resisting cast steel exhaust manifold and casting process thereof
  • Austenite heat-resisting cast steel exhaust manifold and casting process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The austenitic heat-resistant cast steel exhaust manifold of the present invention can be composed of the following chemical components in mass percentage: C 0.3-0.5%, Si 1.0-2.5%, Mn≤0.2%, Cr 24-27%, Ni 19 -22%, Mo ≤0.5%, P ≤0.04%, S ≤0.04%, and the rest is Fe.

[0030] The process method of the austenitic heat-resistant cast steel exhaust manifold comprises the following steps:

[0031](1) Furnace charge preparation: Scrap steel is supplied at a fixed point, with uniform composition, no rust, and no impurities; the fixed carbon content of the recarburizer is ≤98%, and the particle size is 2-6; Ni is added in the form of electrolytic nickel; Cr is added with Cr 60 -65% is added in the form of micro-carbon ferrochromium; Mo is added in the form of ferromolybdenum containing 55-60% Mo, particle size: 10-50mm, and Si is added in the form of 75 ferrosilicon, particle size: 10-50mm. Scrap steel and various alloys are used as metal charge for batching according to the st...

Embodiment 2

[0043] The austenitic heat-resistant cast steel exhaust manifold of the present invention can be composed of the following chemical components in mass percentage: C 0.2-0.6%, Si ≤ 2%, Mn ≤ 0.2%, Cr 28-32%, Ni 18- 22%, Mo ≤0.5%, Nb 0.8-1.6%, P ≤0.04%, S ≤0.04%, and the rest is Fe. The casting method is the same as in Example 1. Through experiments, it is cast according to the ingredients and methods of this example. The mechanical properties of the austenitic heat-resistant cast steel exhaust manifold are: σ b =450MPa, σ 0.2 =245MPa, δ=8%.

Embodiment 3

[0045] The austenitic heat-resistant cast steel exhaust manifold of the present invention can be composed of the following chemical components in mass percentage: C 0.4-0.5%, Si 0.8-1.25%, Mn 0.75-1.1%, Cr 24-27%, Ni 12-15%, Mo ≤0.5%, N 0.08-0.5%, Nb 1.7-2.1%, P ≤0.04%, S 0.11-0.15%, and the remainder is Fe. The casting method is the same as in Example 1. Through experiments, according to The austenitic heat-resistant cast steel exhaust manifold cast by the ingredients and method of this embodiment has the mechanical performance indexes respectively: σ b =515MPa, σ 0.2 =240MPa, δ=7%, hardness (HBW) is 187~248.

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Abstract

The invention discloses an austenite heat-resisting cast steel exhaust manifold which is prepared from the following chemical components in percentage by mass: 0.2-0.6% of C, less than or equal to 2.5% of Si, less than or equal to 0.2% of Mn, 24-32% of Cr, 12-24% of Ni, less than or equal to 0.5% of Mo, less than or equal to 0.5% of N, less than or equal to 2.1% of Nb, less than or equal to 0.04% of P, less than or equal to 0.15% of S and the balance of Fe. Industrial large-scale production of the austenite heat-resisting cast steel exhaust manifold is achieved by using a shell-type negative pressure casting process method, the produced austenite heat-resisting cast steel exhaust manifold has a good mechanics property, an anti-fatigue property and an anti-oxidation property, the service life of the exhaust manifold is greatly prolonged, and expense on repairing and assembling is reduced.

Description

technical field [0001] The invention belongs to the technical field of manufacturing automobile exhaust manifolds, in particular to an austenitic heat-resistant cast steel exhaust manifold and its casting process. Background technique [0002] The automobile industry has developed by leaps and bounds in recent years, but with the increasingly prominent problems of energy and environment, the energy conservation and environmental protection of automobile engines are facing higher challenges and need to meet more stringent requirements. Exhaust manifold is a key part of automobile engine, its quality directly affects the service life and emission performance of the engine. As an important part of a car, the engine exhaust manifold is a typical thin-walled complex casting. During the working process of the engine, the exhaust manifold bears the cyclic impact of high temperature and high pressure, and the working conditions are harsh. Therefore, the quality of the exhaust manif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/60C22C38/48C22C38/44C22C38/40C22C33/04B22D18/04
Inventor 李党育李立新田书涛史玉峰申辉李长武柴西成李小娟王其
Owner 西峡县内燃机进排气管有限责任公司
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