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  1. steelmtllrgst

    4140 prioir austenite grain boundries dangerous in drilling equipment

    Hi. You can see prior austenite boundaries with nital in some cases, depending heavily on thermal history. In the as-cast coarse prior austenite state the boundaries are very clear with nital.
  2. steelmtllrgst

    Automated vs manual steel microcleanliness

    Hi Maui. The Leica software was able to do this and was quite user-friendly for removing artifacts. The problem is more on the high number of D-thin for E45 Method D, it would take longer to go through each field for these tiny inclusions than it would to just rate it manually.
  3. steelmtllrgst

    Automated vs manual steel microcleanliness

    Thanks Friends.
  4. steelmtllrgst

    Automated vs manual steel microcleanliness

    Hi Friends. I am looking at purchasing a new optical microscope that has automated inclusion analysis (image analysis) per ASTM E45. When the unit was demonstrated, it counted roughly 4X more D-thin inclusions in E45 Method D rating than our metallographer found. Another metallographer from a...
  5. steelmtllrgst

    hi mn steel decarborizing

    Hi Vnajati. You will need a low C iron source and electrolytic Mn.
  6. steelmtllrgst

    Lowering temperature below the equilibrium solidification temperature nucleation occurs more readily

    I am not able to see your link to comment on the figures that you have noted. That said, the plot of G vs r is typically used just to show the inflection point noted as r* where the precipitate becomes energetically stable, and any increase in r will result in a lowering of the total free...
  7. steelmtllrgst

    Continue Working or Pursue a Graduate Degree?

    Hi Turbulent. It sound like you want the ultimate compromise of a good steady income and a doctoral degree. It is possible to do this - painful but possible. With the right student, sponsor and university you can try to arrange to study part-time for a doctoral degree while continuing to work...
  8. steelmtllrgst

    atomic gas limits in low alloy steels

    OK, thank you for the clarification. I think it is always important to note the very different aspects of environmental hydrogen induced cracking versus hydrogen flaking. Although caused by the same element, they are essentially unrelated when discussing prevention. Cheers!
  9. steelmtllrgst

    atomic gas limits in low alloy steels

    Mr. McGuire, are you suggesting that vacuum treatment of steels is a pointless measure to prevent hydrogen flaking???
  10. steelmtllrgst

    atomic gas limits in low alloy steels

    I will give you some information from experience, hopefully it is helpful! Regarding nitrogen, there is concern with high nitrogen causing hot ductility issues in the grades mentioned, but for most steel production methods you should be less than 120 ppm N and the potential for problems is...
  11. steelmtllrgst

    Spectrometer

    Just another opinion... ARL is our preferres OES vendor. They make great units. I think Spectro leaves a lot to be desired in customer service, they are maybe one of the most difficult companies to deal with. That said, we have a couple of their units as well and the equipment performs well.
  12. steelmtllrgst

    How do you add N in steel

    I have used the following: FeCrN FeMnN Si3N4 Both the Cr and Mn methods show good and consistent recovery, Si3N4 is somewhat more variable.
  13. steelmtllrgst

    Chromium Equivalent Formula I Haven't Seen Before

    correct, this formula I have seen before on 9-12 Cr steels except with the Mn factor being 2 not s. That part may be a typo.
  14. steelmtllrgst

    how to add alloy elements to an existing alloy?

    Definitely will need to use a button melter or a small induction coil. At the end of the day, you will need to add virgin alloys of each element not just Ni and Cr due to dilution from the ~15% alloy addition you want to make. Just in case this is homework, I will not do the work for you...
  15. steelmtllrgst

    Carbon print of the production of hollow section steel profile

    Carbon footprint will depend solely on the size of the carbon boot.
  16. steelmtllrgst

    custom quartz crucibles

    Much appreciated, Ceramicguy. I will make the corrections and contact your suggested vendor.
  17. steelmtllrgst

    custom quartz crucibles

    Hi everyone. I am somewhat out of my element here, please help. Trying to get some small custom made quartz crucibles produced for hot tension testing of steel. Having trouble getting anyone to quote and I need to know why so I can properly re-design. The troublesome parts are a quartz...
  18. steelmtllrgst

    How important is having SEM/EDS capability in a metallurgical lab?

    Coreman73- For metal failure analysis it is also worthwhile to consider an R.J.Lee PSEM. It is a small SEM with EDS capability but at a MUCH better price than most other SEMs. Typically for failure analysis of metals you will not need 30,000X to identify the cause of failure. These units...
  19. steelmtllrgst

    steel flat bar production line

    Just my two cents, but the complexity of producing a quality finished product from scrap metal seems to be somewhat underestimated in the way your question is posed.
  20. steelmtllrgst

    Hot Rolling Service Providers

    Not sure of your location, but I would think that your local engineering university may have the equipment if they are metallurgically strong.

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