3.5%ニッケル鋼溶接金属の熱間割れに対するジルコニウム,チタンおよびマンガン添加の効果
1973 年 42 巻 4 号 p. 333-342
詳細
1973 年 42 巻 4 号 p. 333-342
It is well known that a low melting point filmy sulfide causes hot cracking in a steel weld metal. Especially, in the case of nickel steel weld metal containing over 2.5% of nickel, the occurrence of such hot cracking becomes more significant even in a small amount of sulphur, such as 0.01 %. In this paper, the effect of alloying elements, which can effectively change the iron sulfide film into other sulfides of higher melting point and of globular form, was studied to prevent such not cracking.
The experimental result showed that hot cracking of 3.5% Ni steel weld metal can be prevented by addition of strong sulfide forming elements, like zirconium or titanium. These elements are much more effective to prevent such hot cracking than manganese. Sulfide inclusion of these elements seems to be globular type of MnS, TiS or ZrS, respectively.
