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Heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties

A technology of austenitic stainless steel with comprehensive performance, which is applied in the field of automobile engine exhaust system components and heat-resistant cast austenitic stainless steel, which can solve the problems of high production cost and unsuitability for use in automobile engines, and achieve low production cost and improved Effects of combustion efficiency and exhaust gas purification ability, high temperature resistance and durability

Active Publication Date: 2015-05-06
UNIV OF SCI & TECH BEIJING
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  • Abstract
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  • Claims
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Problems solved by technology

But the Ni content of this cast steel exceeds 20% (mass fraction), thereby its production cost is higher, is not suitable for using on energy-saving and emission-reducing and economical automobile engines

Method used

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  • Heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties
  • Heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties
  • Heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties

Examples

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Embodiment 5

[0067] Examples 5 to 7 are cast steels containing N, W and no Mo, wherein the metallographic microstructure of Example 5 is as follows image 3 shown. The high-temperature creep life of Examples 5-7 at 1000°C and 50 MPa is significantly higher than that of the commercial alloy CF8C-Plus, and its room temperature, high-temperature and low-cycle fatigue life and high-temperature oxidation increment meet the service conditions of the exhaust system.

[0068] Examples 8-10 are cast steels containing N, Mo and no W. Their high-temperature creep life at 1000°C and 50 MPa is significantly higher than that of the commercial alloy CF8C-Plus, and their low-cycle fatigue life at room temperature satisfies the exhaust System service conditions.

[0069] The chemical composition (mass percentage) of table 1 embodiment

[0070] serial number Fe Cr Ni Nb C Si mn N W Mo Example 1 Bal. 20.35 9.86 2.08 0.43 0.60 1.01 0.29 - - Example 2 Bal. 20...

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Abstract

The invention belongs to the technical field of new materials, and provides a heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive properties, which is mainly used in automobile engine exhaust system components of which the exhaust temperature exceeds 1000 DEG C, including exhaust manifolds, turbine casings and the like. The heat-resistant cast austenitic stainless steel comprises the following alloy components in percentage by mass: 0.1%-0.6% of C, 0.1%-0.5% of N, 0.4%-1.5% of Si, less than 1.5% of Mn, 17.5%-22.5% of Cr, 8.0%-13.0% of Ni, 1.0%-3.0% of Nb, less than 5.0% of W, less than 6.5% of Mo and the balance of matrix element Fe and impurity elements, including less than 0.04% of P, less than 0.03% of S, less than 0.04% of O and less than 0.05% of Al. The heat-resistant austenitic stainless steel is produced by a casting method without later-period heat treatment, and has the advantages of lower production cost, higher temperature resistance and higher durability as compared with like heat-resistant cast steel.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a heat-resistant cast austenitic stainless steel with excellent high-temperature comprehensive performance, which is mainly used in exhaust system components of automobile engines whose exhaust temperature exceeds 1000°C, including exhaust manifolds and turbine casings Wait. Background technique [0002] Automobile exhaust is one of the important sources of urban air pollution. In recent years, smog has frequently appeared in our country, and the government can no longer bear the pressure of environmental protection caused by smog all over the country. From July 1, 2011, all light-duty gasoline vehicles, single-gas fuel vehicles and dual-purpose fuel vehicles that do not meet the requirements of the National IV standards shall not be sold or registered. From January 1, 2015, the products of National III diesel vehicles will not be sold. At the beginning of 2013, the "Opini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/48C22C33/06
CPCC22C33/06C22C38/001C22C38/02C22C38/04C22C38/06C22C38/18C22C38/40C22C38/44C22C38/48
Inventor 冯强张银辉李梅赵海龙拉里·高德莱维斯基雅各布·辛德
Owner UNIV OF SCI & TECH BEIJING
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