高温高壓水素ガスの鋼に對する作用並に各種元素の影響 : 高温高壓第 1 報

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The attack of hydrogen on the carbon steel with varying carbon contents at elevated temperatures and under high pressures and the effect of alloying elements were experimentel. In carbon steels at the constant temperature of 500℃ and under different pressures ranging from 50 atm. to 300 atm., the steels were severely attacked by hydrogen and suffered a remarkable decarburization, fissure format on and decrease of mechanical properties and, above all, they become ductile under 200∿300 atm. Such attacks were much pronounced in the higher carbon sile. At 100 atm., the attack of hydrogen was less prominent than at 200∿300 atm., and there was a tendency that the lower carbon side was little more attacked than the higher carbon side. At 50 atm., the attack was almost neglible. Moreover, the experiment was extended to 0.1% and 0.6% carbon steel at varying temperatures from 350℃, and respectively under 100, 150 and 200 atm. pressures. The temperatures at which the remarkable attack of hydrogen was observed were 450℃ at 100 atm., 400℃ at 150 atm., and 350℃ at 200 atm. It was presumed that the 0.1% carbon steel was less attacked than the 0.6% carbon steel with the rise of temperatures and pressures. Being based on the aforementioned experiments that were the result of the author's actual factory test, the temperature-pressure-stability limiting curve of carbon steel against the hydrogen attack was plotted as shown in Fig. 13. As for the effect of various alloying elements on the hydrogen attack, it was classified into the following three groups : (1) Elements which do not form carbide such as, Ni, Si, Al and P. (2) Carbide forming elements, which are soluble in Fe_3C, such as, Mn, W, Mo and Cr. (3) Special carbide for ning elements such as, V, Ti, and Cb. Some of the elements which do not form carbide, such as Ni, Si and P, were apparently beneficial, but Al showed some resistance Among the carbide forming elements, Mn revealed a little effect; W, Mo and Cr were positively effective with the increase of contents, and in the same content, the order of prevalence was Cr, Mo and W. Cr showed favorable effect at the percentage more than 15 times of the C content and than 20 times of the C content, respectively at 500℃ unter 200 atm., and 500℃ under 300 atm. The 1% Cr-Mo steel was attacked severely by hydrogen at 500℃ under 300 atm., but showed good resistance at 500℃ under 100∿200 atm. Among the special carbide forming elements, V, Ti, and Cb were much more etfective than W, Mo, Cr and favorable etfect was observed when V/C was >6, Ti/C was >4, and Cb/C was >10. It may be concluded that all the effective elements were within the 4 th, 5 th and 6 th groups and below the 4 th period of the periodic system of eiements; and that, in the same groups and periods, the preceding elements were more eff ective than the following.
1942-01-25

高温高壓水素ガスの鋼に對する作用並に各種元素の影響 : 高温高壓第 1 報

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