316 stainless steel thermos cups are more expensive than 304 stainless steel tubes

Are 316 stainless steel thermos more expensive than 304 stainless steel tubes? 304 stainless steel pipe and 316 stainless steel can be said to be the two most metal materials that ordinary people can come into contact with, so what is the difference between them - or let us expand the question a little more, what is stainless steel? What is 304 or 316 stainless steel? What is steel? I happen to be free today, so let’s get to the bottom of things—I try to be as simple as possible, and omit special professional terms. Iron and steel We often hear the word 'iron makingThe most abundant impurity in iron ore is carbon - so, we use the level of carbon content as the standard for measuring iron. High carbon content (more than 2%) is called iron (also called pig iron); low carbon content (2% and below) is called steel (also called wrought iron). The higher the carbon content, the harder it is, but the more brittle it is - so the steel is tougher but less hard. Steel and stainless steel The common name of steel is 'wrought iron' which may be better understood by everyone - the wrought iron in everyone's impression may have nothing to do with 'not rusting'. There are many kinds of steel, and stainless steel is just one of them. Stainless steel and austenitic stainless steel We usually say and understand 'stainless steel(e.g. adding chrome). But not rusting, it only means that it will not be corroded by air, and the ability is still too poor. So we also need it to be resistant to chemical corrosion, so 'stainless acid-resistant steel' appeared. If you want to make stainless acid-resistant steel, you need to add many kinds of metals - to put it bluntly, there is a set of formulas. There are only three common formulations: martensitic stainless steel, ferritic stainless steel and austenitic stainless steel.

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