二, 三の含 Ti 高温用鋼の諸性質について (I)

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From the standpoint of resistance for high tempreature and high pressure mixture gases in an ammonia synthesis industry, five kinds of steel, e. g. Ni, Ni-Ti, Mo-Ti, Ni-W and Ni-W-Ti steel were selected and their practical properties were studied. These steels were generally low carbon and low alloy containing steel, and as for titanium bearing steel, its carbon was fixed by adding titanium over about five times of the carbon content. Results of various tests were summalized as follows : - 1) Properties of titanium-bearing steel were changed according to the condition of titanium carbide, whether its carbide is soluble or insoluble. That is to say, when titanium-bearing steel was quenched from high temperature as its carbide was dissolved, it hardened to high hardness, then its carbide precipitated by tempering at about 550℃ and caused precipitation hardening and brittleness. 2) Titanium bearing steel, normalized at 800∿900℃ after hot forging or hot rolling, was greatly softened and increased its toughness. When it was quenched from these temperatures, its hardenability was little. 3) Titanium addition to Ni steel and Mo steel, increased its strength at high temperature, but on the contrary titanium to Ni-W steel decreased in Toughness at high temperature was all remarkably improved. 4) Rupture strength at 550℃ decreased by titanium addition. 5) According to welding test of each plate specimens by 18-8 welding rod, titanium bearing steel and Ni-W steel were better to adopt preheating to dodge the brittleness at fused zone. 6) By oxygen cutting, every plate could be cut easily, except Ni-W-Ti steel plate which was difficult a little.
社団法人日本鉄鋼協会の論文
1952-11-25

二, 三の含 Ti 高温用鋼の諸性質について (I)

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