Maraging steel excellent in fatigue characteristics and method for producing the same
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United States of America Patent
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Jan 29, 2008
Grant Date -
Dec 27, 2007
app pub date -
Mar 26, 2004
filing date -
Mar 19, 1999
priority date (Note) -
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Abstract
A process of producing a maraging steel includes melting a steel of a defined composition, casting the molten steel to obtain a steel ingot, hot forging the steel ingot at a forging ratio of at least 4, then soaking the forged piece one or more times to keep the forged piece in a temperature range of 1100-1280.degree. C. for 10-100 hours, and then plastic working the forged piece. A process of producing a maraging steel of another defined composition includes casting the molten steel to obtain a steel ingot with a defined taper, a defined height to diameter ratio and a defined flatness ratio and plastic working the steel ingot so that the size of a nonmetallic inclusion is 30 .mu.m or less expressed as the diameter of a circle of circumference equal to the perimeter ('circumference') of the inclusion.
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