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STAINLESS STEELS - Hot and Otherwise
ISSN: 0148-7191, e-ISSN: 2688-3627
Published January 01, 1944 by SAE International in United States
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AIRCRAFT exhaust systems must be designed to withstand service conditions that include severe vibrations, high temperatures from the hot exhaust gases passing along the inside of the pipes at relatively high velocities, while the outside of the pipe system may be subjected to rain and sea atmosphere.
These extreme conditions of operation led to difficulties in the application of stainless steel to the exhaust system.
Failures caused by intergranular corrosion from carbide precipitation need no longer be feared when properly stabilized 18-8 stainless steel is used.
Stainless steel can be stabilized with either titanium or columbium, the cheaper and more easily worked titanium-type steel being satisfactory for most installations, although there are applications where the columbium type must be used because of its higher yield and tensile strengths.
This improved stainless, however has not solved the problem of corrosion at high temperatures in the presence of zinc. Zinc, as bits from drop hammer dies, plating, or in any other form, should be kept away from stainless steel at elevated temperatures.
Another problem that is sometimes annoying is the cracking of welds in thin stainless sheets such as are used in exhaust systems. Rigid control of the composition of the welding flux has been found to eliminate this trouble.
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CitationCAMPBELL, H., "STAINLESS STEELS - Hot and Otherwise," SAE Technical Paper 440151, 1944, https://doi.org/10.4271/440151.
- Vestnik Metallopromishlennosti 16 17 1936 73 86 “Investigation of Corrosion of Modern Valve Steels in Gaseous Media and at Increased Temperature,” Zinovyev V. Levin I.
- Archiv für das Eisenhüttenwesen 11 September 1937 131 138 “Heat-Resisting Steels under Attack by Gases,” Houdremont E. Bandel G.
- Stahl und Eisen 61 1941 852 860 “Present Status of Wrought Heat-Resisting Steels,” Riedrich G. Committee on Materials of VDE