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MANUFACTURING METHOD OF STEEL MEMBER HAVING EXCELLENT RESISTANCE PROPERTY IN FATIGUE CRACK PROPAGATION
MANUFACTURING METHOD OF STEEL MEMBER HAVING EXCELLENT RESISTANCE PROPERTY IN FATIGUE CRACK PROPAGATION
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机译:疲劳裂纹扩展中具有优异抵抗性能的钢构件制造方法
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PROBLEM TO BE SOLVED: To provide a manufacturing method of a thick steel plate having an excellent resistance property in fatigue crack propagation which is suitable as a structure material used in a ship hull, a bridge or the like.;SOLUTION: In the method, a cast slab having a rationalized chemical composition is heated at 1,000°C-1,300°C and hot-rolled so that a rolling finishing temperature reaches an Ar3 transformation point or higher. After that, the cast slab is heated again at a temperature range of the Ac3 transformation point or higher, and after being held for a short time, the cast slab is cooled by air or cooled so as to be accelerated. Furthermore, the cast slab is heated again at a temperature range of an Ac1 transformation point plus 10°C to an Ac3 transformation point minus 10°C, and after being held for a short time, the cast slab is hardened at an average cooling rate of 5°C/s or higher, and tempered at 400°C or higher and an Ac1 point or lower. Alternatively, the cast slab is heated again at 1,000°C-1,300°C, and hot-rolled so that a rolling finishing temperature reaches the Ar3 transformation point or higher. Then after being cooled, the cast slab is heated again at the temperature range of the Ac3 transformation point or higher, and after keeping this temperature, the cast slab is cooled by air or cooled so as to be accelerated. Furthermore, the cast slab is heated again at two phase temperature ranges of the Ac1 transformation point plus 10°C to the Ac3 transformation point minus 10°C and after being held for a short time, the cast slab is hardened at an average cooling rate of 5°C/s or higher, and tempered at 400°C or higher and the Ac1 transformation point or lower.;COPYRIGHT: (C)2012,JPO&INPIT
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