Accession Number : AD0671144

Title :   READILY AVAILABLE HYDROGEN-RESISTANT STEEL (MALODEFITSITNYE VODORODOUSTOICHIVYE STALI),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Archakov,Yu. I. ; Grebeshkova,I. D.

Report Date : 12 SEP 1967

Pagination or Media Count : 37

Abstract : The influence of alloying elements on the hydrogen resistance of steel was investigated on specimens subjected to hydrogen at various pressures at 600C, and for various test durations. Mechanical tests performed before and after heating in hydrogen showed the corresponding changes in physical properties. Four series of tests were carried out: (1) variation of the chromium content in chromium steels (hydrogen pressure 400--800 kg/sq cm for 1000--4000 hours); (2) variation of the tungsten, columbium, vanadium and titanium content (800 kg/sq cm; 1000 hours); (3) variation of the molybdenum, tungsten, columbium, vanadium, and titanium content in steel with 0.2% C, 3% Cr (400--750 kg/sq cm; 1000--2000 hours); (4) variation of the silicon, molybdenum, tungsten, vanadium, and titanium content in steel with 0.2% C, 6% Cr (800 kg/sq cm; 4000 hours). From the obtained test results it is concluded that the hydrogen resistance of steel is determined mainly by the type of carbide phase, the character of the interatomic ties between carbon and the alloying element, and secondarily by the velocity of carbon diffusion in chromium-containing ferrite. Tests showed that additions of Cr, Mo, W, V, Cb, and Ti increase the stability of the carbide phase; at the same time, the velocity of carbide phase coagulation decreases. The degree of dispersion of the carbide component is apparently not important. To stabilize steel with 0.2% C, 3-6% Cr against hydrogen corrosion (at 600C), the addition of stronger carbide-forming elements such as V, Cb, and Ti, or the addition of more than 9% Cr, is required. (Author)

Descriptors :   (*STEEL, *CORROSION RESISTANT ALLOYS), HYDROGEN EMBRITTLEMENT, HYDROGEN, CORROSION, CORROSION INHIBITION, CHROMIUM ALLOYS, TUNGSTEN ALLOYS, NIOBIUM ALLOYS, VANADIUM ALLOYS, TITANIUM ALLOYS, MOLYBDENUM ALLOYS, SILICON ALLOYS, CARBIDES, PHASE STUDIES, USSR

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE