The composition and structure of spring steel, the changes in strength due to carbon content, and the importance of quenching.
[Reproduction of Private Spring Preparatory School Lecture 53] Study of heat treatment that creates spring hardness! Explanation of carbon that strengthens steel.
I plan to study the heat treatment that creates spring hardness. That said, since there are new students, let's also study the structure beforehand. Pure iron is surprisingly soft, so it is not useful in the machinery industry. However, if you add a tiny amount of carbon to this iron, it becomes something very useful called carbon steel. The amount of carbon increases in the order of mild steel, medium carbon steel, hard steel, and ultra-hard steel, with the carbon steel for springs (SUP3 and 4) belonging to the ultra-hard steel category. Even in this ultra-hard steel, the carbon content is only about 1.5%. I apologize for the repetition, but let's take another look at the JIS spring steel material table here. *For detailed content of the article, you can view it in the PDF. For more information, please feel free to contact us.*
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