06-04-2017 дата публикации
Номер: US20170096728A1
Принадлежит:
A production method of a maraging steel includes: the step of producing, by vacuum melting, a remelt electrode which comprises from 0.2 to 3.0% by mass of Ti and from 0.0025 to 0.0050% by mass of N; and the step of remelting the remelt electrode to produce a steel ingot having an average diameter of 650 mm or more; wherein the resulting maraging steel includes from 0.2 to 3.0% by mass of Ti. 1. A production method of a maraging steel , comprising:a step of producing a remelt electrode by vacuum melting, the remelt electrode comprising from 0.2 to 3.0% by mass of Ti and from 0.0025 to 0.0050% by mass of N; anda step of producing a steel ingot having an average diameter of 650 mm or more by remelting the remelt electrode;wherein the resulting maraging steel comprises from 0.2 to 3.0% by mass of Ti.2. The production method of a maraging steel according to claim 1 , wherein the step of producing a remelt electrode comprises adding N to molten steel.3. The production method of a maraging steel according to claim 2 , wherein the N is added to the molten steel by introducing nitrogen gas into an atmosphere in contact with the molten steel.4. The production method of a maraging steel according to claim 1 , wherein the remelt electrode further comprises from 0.01 to 0.10% by mass of Si.5. The production method of a maraging steel according to claim 1 , wherein the remelt electrode further comprises from 0.01 to 0.10% by mass of mn.6. The production method of a maraging steel according to claim 1 , wherein the remelt electrode further comprises 1.7% by mass or less of Al.7. The production method of a maraging steel according to claim 1 , wherein the step of remelting the remelt electrode to produce a steel ingot comprises remelting the remelt electrode by vacuum arc remelting.8. The production method of a maraging steel according to claim 1 , wherein the remelt electrode has a chemical composition of 0.01% by mass or less of C claim 1 , 1.7% by mass or less of Al claim 1 , ...
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