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Heat and corrosion resistant cast austenitic stainless steelalloy with improved high temperature strength

An austenitic stainless steel, corrosion-resistant technology, applied in the direction of machines/engines, mechanical equipment, engine components, etc., can solve the problem of destroying the properties of steel

Inactive Publication Date: 2009-08-12
CATERPILLAR INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As previously stated, the presence of ferrite and sigma phases destroys the properties of steels exposed to high temperatures

Method used

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  • Heat and corrosion resistant cast austenitic stainless steelalloy with improved high temperature strength
  • Heat and corrosion resistant cast austenitic stainless steelalloy with improved high temperature strength
  • Heat and corrosion resistant cast austenitic stainless steelalloy with improved high temperature strength

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Embodiment Construction

[0021] CF8C is the traditional casting equivalent of Type 347 stainless steel. The chemistry of CF8C-Plus is based on the composition of CF8C with precise additions of Nickel (Ni), Manganese (Mn) and Nitrogen (N), with reduced Silicon (Si) content and adjustments for other minor alloying elements. These modifications to the alloy were made to improve the high-temperature mechanical properties and casting characteristics of CF8C steels using inexpensive alloying elements without the need for post-casting heat treatment.

[0022] Table I

[0023]

[0024] Table I relates to maximum and minimum value ranges for the constituent elements of the alloys according to the invention. Table I also includes (in the column labeled "Alloy Examples") examples of embodiments of alloys made in accordance with the present invention. Embodiments covered by the present invention include alloys having any subgroup of compositional ranges falling between the minimum and maximum ranges shown in...

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Abstract

The present invention relates to a heat and corrosion resistant cast austenitic stainless steel alloy which contains less than about 15% nickel. When the alloy is executed with creep deformation test in the test condition of ASTM E137 with a cast state, the creep rupture lift exceeds 3,000hours and the least creep rupture speed is lower than 1*10 at a stress of 100MPa and a temperature of 750 DEG C. The 0.2% yield strength of alloy also exceeds 130MPa in cast state at 750DEG C in cast state. From 750 DEG C to 900 DEG C, the reduction of 0.2% yield strength does not exceed 20%. Furthermore, the heat and corrosion resistant cast austenitic stainless steel alloy has a total austenite micro-structure.

Description

technical field [0001] The present invention generally relates to cast austenitic stainless steel alloys of the CF8C type with improved high temperature strength. More specifically, the present invention relates to CF8C type stainless steel alloys and articles cast therefrom having excellent high temperature creep strength and aging resistance, which exhibit a stable austenitic microstructure after casting and high temperature aging and are substantially free of Contains delta ferrite. Background technique [0002] For use in components that experience extreme temperature environments, high strength, oxidation and crack resistant casting alloys are required. Advanced diesel engines must maintain high fuel efficiency and low exhaust emissions without sacrificing durability and reliability. More severe duty cycles require exhaust manifold and turbocharger housing materials that can withstand temperatures above 750°C. These materials must withstand prolonged, stable high tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00F01N13/16
CPCC22C38/02C22C38/48C22C38/58C21D2211/001C21D6/004C22C38/001C22C38/44C22C38/42
Inventor P·J·玛齐阿茨J·P·欣格莱德克尔M·J·波拉德
Owner CATERPILLAR INC
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