Latest R&D Trends in Japanese Stainless Steel
Thread Content
The development trends of new stainless steel grades in Japan focus on creating grades that combine multiple properties such as strength or hardness with corrosion resistance, as well as strength with workability. There is also a focus on grades designed to save energy and resources, as well as grades for special applications. As a steel grade that combines hardness and corrosion resistance, a high-nitrogen martensitic stainless steel containing 0.5% N was developed using the pressure-induced melting casting method, and is used in bearings for automobiles and semiconductors, as well as pressure and flow control valves. As a steel grade that combines strength and workability, an austenitic steel designed to improve spring properties and fatigue strength for use in automotive engine gaskets was developed based on SUS301, by reducing carbon content, adding Nb to refine the grain structure, and maintaining workability through increased amounts of deformation-induced martensite. As an example of the development of energy-saving and resource-conserving stainless steels, a resource-efficient, high-heat-resistant ferritic stainless steel was developed without the use of Mo, relying instead on Cu precipitation strengthening and Al solid solution strengthening to enhance its high-temperature strength; this steel is suitable for use in automotive exhaust system components. In addition, to replace SUS304, ferritic stainless steels with a Cr content increased to 21% and without Mo have been developed, as well as ferritic steel grades in which Sn is added to steels with 14%-16% Cr to improve corrosion resistance. Among duplex stainless steels that possess both strength and corrosion resistance, alloy-saving duplex stainless steels with reduced Ni and Mo contents have been developed for use in dam gates, steel-related equipment, chemical tankers, water treatment equipment, civil construction, and seawater desalination equipment. As a stainless steel for special purposes, in next-generation processing equipment, highly corrosion-resistant ultra-pure stainless steels capable of reducing impurities have been developed to prevent intergranular corrosion caused by the strongly oxidizing nitric acid.
We can all hate the Japanese, despise them; I want Japan to be destroyed. This isn’t something that can be done just by thinking about it, but we also don’t need to say it to everyone we meet. I can just stick to my own choices – I don’t support Japanese celebrities, I don’t buy Japanese cars, I don’t travel to Japan, and I don’t purchase Japanese goods. That’s my attitude. However, if we do not learn from others’ advanced technologies, we will be forced to return to that miserable era of the past. When will China have its own cameras? ? ? 、、? And many other things? ? ? ? ? ? ? ? ? ?
We can all hate the Japanese, despise them; I want Japan to be destroyed. This isn’t something that can be done just by thinking about it, but we also don’t need to say it to everyone we meet. I can just stick to my own choices – I don’t support Japanese celebrities, I don’t buy Japanese cars, I don’t travel to Japan, and I don’t purchase Japanese goods. That’s my attitude. However, if we do not learn from others’ advanced technologies, we will be forced to return to that miserable era of the past. When will China have its own cameras? ? ? And many other things? ? ? ? ? ? ? ? ? ?