source of Mg, Ti, and Mn in 304 SS
source of Mg, Ti, and Mn in 304 SS
(OP)
dear all,
recently we have a crack issue in our 304ss bar and large inclusions were found along the crack. the sample was prepared and tested with SEM/EDS. attached is two figures of the test results, pls. review. could anyone tell me what is the source of the Mg, Ti, Mn and the other elements in the inclusion and how to prevent it happening? looking for your reply and thanks.
recently we have a crack issue in our 304ss bar and large inclusions were found along the crack. the sample was prepared and tested with SEM/EDS. attached is two figures of the test results, pls. review. could anyone tell me what is the source of the Mg, Ti, Mn and the other elements in the inclusion and how to prevent it happening? looking for your reply and thanks.





RE: source of Mg, Ti, and Mn in 304 SS
RE: source of Mg, Ti, and Mn in 304 SS
a) Mg source is refractory wear out from melting furnace.
b) Ti and Mn : Poor selection of charge mix . Ti and Mn containing charge must have been blended.
RE: source of Mg, Ti, and Mn in 304 SS
RE: source of Mg, Ti, and Mn in 304 SS
Aaron Tanzer
www.lehightesting.com
RE: source of Mg, Ti, and Mn in 304 SS
RE: source of Mg, Ti, and Mn in 304 SS
What is the product form? (plate, sheet, long product)
Was it continuously cast or ingot cast?
Is this near the surface or interior?
What was the hot reduction and cold reduction in forming?
I hate to say it but getting clean 304L and 316L is difficult. They are commodities and most mills treat them as such.
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Plymouth Tube
RE: source of Mg, Ti, and Mn in 304 SS
RE: source of Mg, Ti, and Mn in 304 SS
But if it is a large oxide inclusion I would suspect a piece of refractory.
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Plymouth Tube
RE: source of Mg, Ti, and Mn in 304 SS
Aaron Tanzer
www.lehightesting.com
RE: source of Mg, Ti, and Mn in 304 SS
RE: source of Mg, Ti, and Mn in 304 SS
RE: source of Mg, Ti, and Mn in 304 SS
The Ti may have been intentional, but we can never know for sure. Some steel makers add it to suppress hot workability problems. In this case, however, the steel maker doesn't look that sophisticated.
Arunmrao! I'm in Mumbai on April 21. Is that convenient for a visit?
Michael McGuire
http://stainlesssteelforengineers.blogspot.com/
RE: source of Mg, Ti, and Mn in 304 SS
thank you very much for your reply.
so far, i know a little about the process. what i know is the inclusion is in the center of the bar. and the bar's diameter is about 20mm; attached is another figure which you can see the full view of the inclusion, thanks again for you kindly reply.
RE: source of Mg, Ti, and Mn in 304 SS
I was just wondering if you would respond to the OP and what your response would be. Well, I have not been disappointed, you you have provided a very good insight. A star from me.
Making stainless steel products has been lowered to a commodity product,thus many factors are ignored. For me as a casting manufacturer,poor quality of stainless steel scrap has become a cause of concern.
I have responded on your FB account.