| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.13 ( September 1985 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Fatigue Properties of 50-kgf/mm2 High-Strength Hull Structural Steels Manufactured by Thermomechanical Control Process Shigeto Matsumoto, Asao Narumoto, Chiaki Shiga, Syuzo Ueda |
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Synopsis : Fatigue properties of newly developed steels with a tensile strength 50 kgf/mm2 (490 Mpa) grade, which are manufactured by Kawasaki Thermomechanical Rolling (KTR) and Multipurpose Accelerated Cooling System (MACS), are reported. The newly developed steels exhibit excellent weldability and low-temperature toughness. From the view point of fatigue strength, an investigation has been made on their fatigue properties in the through-thickness direction and on the softening of their high heat input welded joints. The relationship between the through-thickness fatigue strength and sulfur content only was obtained for KTR, MACS and conventional steels. There was no other factor which affects the through-thickness fatigue strength of newly developed steels. Reduction in fatigue strength due to the softening of HAZ was less than 15% when Kt was 1 and less than 10% when Kt was 3. Change in the value of m in Paris' formula due to the softening of HAZ was predicted to be 0.2, which was negligibly small. Base metal and high heat input welded joints of newly developed controlled rolled steels revealed excellent fatigue properties. |
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