About stainless steel
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I would like to ask the teachers: could you tell me about the operating conditions for 304, 321, 316, and 316L? For example, what temperatures can these four types of steel withstand, and which one has the best corrosion resistance? Thank you
This post was last edited by diwu0205 on 2011-1-26 at 11:01. For information on stainless steel, please refer to: http://zhidao.baidu.com/question/129425942.html 304 — General-purpose model； That is, 18/8 stainless steel. The GB grade is 0Cr18Ni9. 316—The second most widely used steel grade after 304, mainly used in the food industry and surgical instruments; molybdenum is added to it to confer a special corrosion-resistant structure. It is also used as \"marine steel\" because it has better resistance to chloride corrosion compared to 304. SS316 is typically used in nuclear fuel reprocessing facilities. 321—It has properties similar to 304, except that the addition of titanium reduces the risk of rusting in the welds of the material. Regarding the heat resistance temperature, you can refer to http://zhidao.baidu.com/question/51184658.html. The corrosion resistance of stainless steel is determined through comprehensive consideration; for example, generally speaking, 316L has better corrosion resistance than 316, but this is not necessarily the case at high temperatures.
In short, 316L has the best corrosion resistance, while 321 can operate at the highest temperatures in ordinary media (those without strong corrosivity); the other grades come next. In the presence of corrosive media, 316L is the best choice. In any case, the difference in temperature is not very significant.
You can look up standards and the properties of materials – all of this is available for reference
Original poster, just search for stainless steel on Baidu Baike