from the conferences organized by TANGER Ltd.
The corrosion resistance of widely used X50CrMnNiNbN21-9 high-alloyed austenite valve steel, in three different combustion gases have been compared. The comparison was performed on the basis of results of kinetic corrosion of the tested steel in combustion gases from propane-butane, gasoline with 5 and 10 % of ethanol additives (v/v) and fuel oil with 5 and 10 % of FAME additives (v/v). The corrosion test was performed gravimetrically under thermal shock conditions by heating samples of the test steels from room temperature up to 1173 K in exhaust gases from a combustion engine, and holding them at this temperature for 2 hs and then cooling at room temperature for about 25 min. Then, the same thermal shock was repeated. After every 10 to 20 such cycles the mass of the samples were measured. This experiment simulated the working conditions of a highly thermal loaded exhaust valves in spark or self-ignited combustion engines. The analysis performed shows that the corrosion resistance of X50CrMnNiNbN21-9 valve steel in an environment of combustion gases from propane-butane and gasoline with 5 and 10 % of ethanol additives (v/v) is comparable, whereas significantly worse corrosion resistance was stated in an environment of combustion gases from fuel oil with 5 % and 10 % (v/v) of FAME additives.
Keywords: valve steel, propane-butane, gasoline, fuel oil© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.