and the FCA-W steel, without increasing the thickness or strengthen, you can get a certain amount of fatigue strength. According to the evaluation of Nippon Kaiji Kyokai, the FCA-W steel parts of the fatigue life of about 2 times higher than the previous steel world pie network information . Thus, to extend the life of the FCA-W steel parts on the basis of, but also by the light of the hull to improve fuel efficiency. In addition, you can omit the grinding processes can reduce costs.
Specifically, Kawasaki Shipbuilding will use the FCA-W steel as LNG cabin cover and the upper deck of welded joints, hatch shell plate, liquid hatch on the deck of the inside of the stiffeners. The site is located in the hull of a central location, take the hull buckling load World Pipe network informed. Previously, the approach adopted in order to ensure a certain degree of fatigue strength are: increase in plate thickness, the installation of stiffeners, or grinding in order to avoid stress concentration.
The high tension steel sheet inthe FCA-W steel
fatigue of the process is: First of small fatigue cracks, these cracks then gradually expanded. Therefore, the fatigue design of steel structures, usually focus on preventing fatigue cracking occurred. Different from this, the company developed in 2001, FCA steel is characterized by inhibiting the expansion of the fatigue cracks have occurred, to achieve the effect of anti-fatigue damage. The new development of the FCA-W steel can further inhibit the fatigue cracking of the welded parts.
Sumitomo Metal Industries has developed a higher fatigue strength of welded joints of the FCA-W steel ". The product is against the fatigue characteristics of outstanding high-tension thick steel plate to the FCA steel further improved. Has decided to adopt the construction of LNG on board in Kawasaki Shipbuilding.