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Steel with excellent toughness in weld heat affected zone and method of manufacturing steel with excellent toughness in weld heat affected zone
Steel with excellent toughness in weld heat affected zone and method of manufacturing steel with excellent toughness in weld heat affected zone
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机译：在焊接热影响区具有优异韧性的钢及在焊接热影响区具有优异韧性的钢的制造方法
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摘要
PROBLEM TO BE SOLVED: To provide a steel material excellent in toughness in a heat affected zone having further enhanced toughness in the heat affected zone by promoting transgranular ferrite transformation, and a production method of the steel material excellent in toughness of the heat affected zone.SOLUTION: The steel material excellent in toughness in a heat affected zone has a chemical component containing, by mass%, C, Si, Mn, P, S, Al, Ti, Mg, O and N in predetermined ranges and the balance Fe with inevitable impurities, and is characterized in that Ti particles each having a particle diameter of 0.01 μm or more and less than 0.5 μm and including oxide consisting of Mg and Al are present with the number density of 10000/mmand Mg-containing oxide particles each having a particle diameter of 0.5 μm to 5 μm and containing Mg of 50% by mass% are present with the number density of 50/mmor more.SELECTED DRAWING: None
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