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Recent content by 5123

  1. 5123

    Cromium

    Mcguire, What would you consider High concentration. Our additions are as follows: Al pellets .05% and FeTi .25%, and at what point of the melt would you consider these additions to be safely deluted to avoid high concentrarions. Thank you, Mario
  2. 5123

    Cromium

    To arumarao, our cromium seem to be falling around max all the time, but the Mn is always at the low end of the spec. Here are some exmaples of 4 heats: Heat 1 Heat2 Heat3 Heat 4 C .02 .01 .02 .03 Cr 18.55 18.42 18.64 18.43 Cu .10 .16 .07...
  3. 5123

    Cromium

    Mcguire, I have looked at the chemistry you mentioned above and compared it to our 316 chemistry. I would like to try your input, unfortunately our 316 chemistry required by the customer is as follows per ASTM A 743 CF-8M: C 0-.08 Cr 18-21 Cu - Mn 0-1.5 Mo 2-3 Nb 0 Ni 9-12 P 0-.04 S 0-.04 Si...
  4. 5123

    Cromium

    You gentlemen are way too smart for me and that is complement. I don't know what you mean when you say duplex alloys, most of my background has been with titanium. All I know is that it is 316, some times we use ingot and some times we use our own gating scrap, these in different percentages...
  5. 5123

    Cromium

    I work for a steel investment casting foundry. Lately we have been experiencing excessive shrink on parts that we never had a problem with. We seem to have a pretty tight process as far as mainting pre-heat and metal temperatures. We also seem to have a good handle on our chemistry, since we...
  6. 5123

    Cromium

    In 316 melting process, do you loose cromium? if so what percentage. Thank you, Mario
  7. 5123

    Charpy test

    This is Mario E, Thank you for the help. I guess I was not clear on the question. The spec for the charpy test on the LCC is 12-16 (Impact Strength/foot-pounds), the average of three test bars. The three test bars are from the same area and usually 1 or two of the three fail, this makes the...
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