高壓筒材料の研究 (II) : クロード合成筒觸媒管用材料に就いて

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Nitrogen and Hydrogen mixtures in ammonia synthesis industry attack steel at high pressures and moderate temperatures. Since a Claude plant applies the pressure and temperature higher than in other ammonia synthesis plants, and therefore catalyst container tubes used at Claude process is attacked specially by mixture of gases, sometimes serious failures may occur. To obtain the low cost resistant steel for mixture of gases, the authors studied on the effect of hydrogen and nitrogen at pressure 800 atm and temperature 600℃ on various kinds of steel. the authors inserted the various kinds of steel in catalyst bed for 258 hours and exposed them to high pressure and temperatures. After exposure, the authors tested steel by various methods. From these tests, the authors could find the effect of mixture gases on steel as follows : - 1) In a Claude catalyst container tube, attacks of nitrogen were more severe than attacks of hydrogen for steel. 2) According as the position rises in tubes, nitrogen absorption of steel increases with concentration of synthetic ammonia 3) Chromium containing steel always cracked by mixture attacks of gas mixtures and this tendency increased with chromium percentage in steel. 4) Nickel was the usefull alloy element because of its crack-proof properties and others. 5) In every steel, low C content was desirable. 6) Titanium gave the resistance for decarburization in steel. In tungusten steel no cracks occourred, moreover the absorption of both hydrogen and nitrogen gases decreased. For Claude plant steel, both elements were usefull.
社団法人日本鉄鋼協会の論文
1952-04-25

高壓筒材料の研究 (II) : クロード合成筒觸媒管用材料に就いて

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