低炭素-3% Ni 鋼に及ぼす Ti の影響

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In order to utilize Ni-Ti steel for materials of the ammonia synthesis equipment the author studied various effects of titanium on low carbon-3% nikel steel. Percentage of added titanium was in the extent of 0∿1.0%, and the authors especially investigated in detail for the range of slight additions. Results of these tests were summarized as follows : - 1) In manufacturing of titanium steel, yield of titanium was improved according with increase of additional titanium quantity. 2) Denitriding effect of titanium of Ni steel was very effective even if the quantity was slight. 3) By addition of titanium to Ni steel, the macrostructure was changed to the small and uniform dendritic structure. 4) Both the A_1 and A_3 transformation points of Ni steel rose with increase of the titanium content. 5) When titanium bearing steel was quenched from high temperature as its carbide was dissolved, it was greatly hardened and caused brittleness. Then there occurved precipitation hardening by tempering at about 550℃ and it seemed that hardening was maximum in 0.6% titanium. 6) In normalized condition at 900℃, the tensile strength slightly decreased, and elongation and reduction of area slightly increasd the with titanium content. Shock resistance was greatly improved according with the increase of titanium content, but it seemed that the most suitable titanium percentage which improve its toughness is about 0.3∿0.4%. 7) In microstructure, it was recognized that the cementite in steel gradually disappeared and fine titanium carbide appeared with increase of the additional titanium percentage. As for grain size, titanium content under 0.3% was effective and more titanium addition resulted in a marked coarse grain mixture. 8) Non-metallic inclusion remarkably increased with titanium addition. 9) From the result of attack test on the Claude catalytic tube, it seemed that the effect of titanium addition appeared for the first time when it was added in steel in quantity more than to fix all the carbon in steel to titanium carbide, and a deficiency of titanium caused cruck. In Ni-Ti steel which fixed all the carbon in steel, an etching ring of high hardness appeared on the surface zone by absorption of nitrogen gas, but the quantity of the absorbed gas was little and it became almost constant.
社団法人日本鉄鋼協会の論文
1953-01-25

低炭素-3% Ni 鋼に及ぼす Ti の影響

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