鉄鋼溶接部における硫化物の挙動と凝固割れ(第 8 報) : Ni 入り高張力鋼の溶接凝固割れ感受性についての検討

概要

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Effects of sulphur, nickel, carbon, manganese and phosphorus on weld solidification crack susceptibility of various commercial and tentative high tensile steels (tensile strength : 50-100kg/(mm)^2 class) have been investigated using the Longi-Varestraint test. Main conclusions obtained are as follows : 1) Sulphur, even at 0.005% level, remarkably increases the solidification crack susceptibility. 2) Nickel and carbon promote the detrimental effect of sulphur (and phosphorus). 3) Even in the steel containing nickel and/or crabon, the high crack susceptibility induced by sulphur can be lowered by increasing the manganese content. And the manganese content required agrees with the value deduced theoretically in the previous paper. This is given by the condition that Mn^5S is larger than 310-560. 4) Phosphorus also remarkably increases the crack susceptibility in the steel containing nickel (and carbon).
社団法人溶接学会の論文
1974-10-05