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Venik wrote in message ...
Wolfhenson wrote: Any steel containing 5% nickel or more is considered to be resistant to atmospheric corrosion in addition most nickel steels contain chromium in similar quantity as nickel and that is another element that makes the steel stainless. Let's stick to technical definitions: stainless steel is a ferrous alloy with a minimum of 10.5% chromium content. Major elements of the MiG-25 were made of appoximately 80% of VNS-2, VNS-4, and VNS-5 alloys, 11% D-19T aluminum alloy and 8% OT4-1 titanium alloy, none of which falls under this definition. The steels used by Russian aircraft makers would probably be more correctly described as corrosion resistant austinitic steels. Stainless Steel AFAIKS is only one type of austinitic steel. Steel, Titanium, Aluminium all have approximetly the same tensile strength per unit weight. Aluminium being less dense than steel is weaker for the same cross sectional area and more must be used. For some structures of an aircraft that are under compressive forces the thicker guages of Aluminium used provides superior stiffness and resistence to buckling although tensile strength is the same. Steel is a perfectly good material for highly concentrated stressed components such as the wing, spars and tail. In these areas Aluminium looses its advantage. Aluminium is good for Most parts of the fueselage where stresses are less concentrated. Titanium falls in between Aluminium and Steel in Density and Heat resistence. Steel has superior thermal resistence than Titanium and Titanium better than Aluminium. The use of corrosion resitent steels on many parts of Russian aircraft may have more to do with resistence to atmopsheric corrosion due to moisture than that due to high temperature oxidation. Steel most defintely is not an inferior material to Titanium: in many cases it is superior in physical properties. It all depends on what the objective is. |
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