最近の新鋼種展望
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The author classified the latest new steels, from the view point of usage, into 3 groups, high tensile steels, high strength and ultra high strength steels and steels for special uses, and described details and principles of developing new steels and also their future tendency.As to high tensile steel, the outline of Japanese standards, recent trend towards strengthening of steels, the future of antiweathering steel and seawater resisting steel, and super strength structural steel, PZ steel and MB steel which were recently developed are described.In the article of high strength steel, the author stated about significance of steels standardized in JIS.And classifying ultra high strength steel from the view point of alloy content the author firstly described the transition from 4340 steel to HP 9-4 steel with the low alloy series, and as to the medium alloy series the application of hot work die steel and matrix steel etc. for high strength use was also touched on.As for the high alloy ultra high strength steel which is primary represened by maraging steel, the author described about strengthening mechanism and fracture toughness, and further explained about microdeplex and TRIP steel as examples of a new direction of technical development.Taking up stainless and heat-resisting steel as steels for special use, the author outlined the influence of alloying elements and microstructure to strengthening, corrosion protection, and oxidation resistance and about the direction of further development in the future.The author also explained briefly the new trend of free-machining steel.
- 大同特殊鋼株式会社の論文
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