Maraging steel and method of producing the same
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United States of America Patent
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Nov 4, 2008
Grant Date -
May 20, 2004
app pub date -
Nov 19, 2003
filing date -
Nov 19, 2002
priority date (Note) -
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Abstract
Disclosed is a method of producing maraging steel, which includes producing a consumable electrode for vacuum remelting; and subjecting the consumable electrode to the vacuum remelting. The consumable electrode contains not less 5 ppm Mg. Disclosed is also a maraging steel containing, by mass %, at least, from more than zero to less than 10 ppm Mg, less than 10 ppm oxygen, and less than 15 ppm nitrogen. The steel contains also nitride inclusions having a maximum length of not more than 15 .mu.m and oxide inclusions having a maximum length of not more than 20 .mu.m. Regarding the oxide inclusions, a content rate of spinel form inclusions having a length of not less than 10 .mu.m to a total content of the spinel form inclusions having a length of not less than 10 .mu.m and alumina inclusions having a length of not less than 10 .mu.m exceeds 0.33 (i.e. 33%).
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