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You will get more useful feedback if you do a couple of things different:

1. Put more information in your question title. To simply say, "Engineering" does not tell the reader anything at all about what you are interested in learning. Most will simply ignore your questions.

2. Elaborate your question more completely. I do not know exactly what you mean when you say "iron grades." What kind of iron are you talking about? Cast iron? Wrought iron? Pig iron? Or something else? Tell us more abut what you mean and why you want to know. In many cases, as in this example, the terminology is not completely universal, so some of us will not know what you mean by a particular term.

DrD

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