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  1. awhicker84

    Ausforming and martensitic stainless steel

    Hi all, I wrote up a question earlier about specifying reduction ratio (or grain size) into a martensitic stainless steel forging spec. I really appreciate the feedback. Now I have similar forging spec related question on the same material (410 Cond II): I am reading about fatigue testing...
  2. awhicker84

    How does an OEM select the proper reduction ratio?

    We're trying to figure out both: how the single shaft failed and how to define reduction ratio.
  3. awhicker84

    How does an OEM select the proper reduction ratio?

    I thought the definition of IC was Chrome Carbide formation at the GB? The galvanization that takes place afterward is the second step in the process. However, my understanding was that martensite formations have a stronger hold on the carbon atoms than austenite. Regardless, I have tried to...
  4. awhicker84

    How does an OEM select the proper reduction ratio?

    Thanks again for your responses. 1) We do have a particular area that we are concerned with. The rotor is highly stressed in one location more than others. We have created a low stress concentration radius in this area, but the overall design can't be changed. In other words, this will...
  5. awhicker84

    How does an OEM select the proper reduction ratio?

    Thanks for your responses. When going to a forging vendor to start the discussion, do I need give them stresses the part sees? We are aiming for 'high quality' shaft material, but beyond that I'm not sure what is possible. Perhaps, as is most cases, it comes down mainly to cost / benefit...
  6. awhicker84

    How does an OEM select the proper reduction ratio?

    Hi all, I'm asking this question as a rotating equipment OEM: How do I choose the proper reduction ratio for a given material? Should I (as the OEM) even specify this at all? The current problem we have is a shaft that we forged where the materials lab tells us that the grain size is larger...
  7. awhicker84

    What alloys are covered in Trumps "steel and aluminum" tariffs?

    Here are the PDF's. It's confusing to me. One PDF defines what 'stainless steel' means for example, but I'm not sure where that is described tariff-wise. I assume these PDF's will be updated soon. Also note that the column 2 tariffs are for non-Normal Trade Relations. The gov't site says...
  8. awhicker84

    Inlet Nozzle - Steam Centrifugal Compressor

    Hi, I'm trying to figure out the best materials for an inlet nozzle on a steam machine. The steam is superheated, but inevitably some liquid condensates. The current solution is cast iron with a nickel coating. I see other steam machines using 316L, but I'm having a hard time finding repair...
  9. awhicker84

    Cast Iron pipe tap

    Service temps are below 300 F. The PMI was done with: PMI Master Plus / Niton XLt 898 XRF. Carbon content was found to be >1.8%, Fe ~86%, Si ~1.35% Those are interesting ways to check for CI. Thanks for the info. The holes are most definitely NOT high stress.
  10. awhicker84

    Cast Iron pipe tap

    Yeah, I have seen nickel on nickel (probably all of us have) galling to the point where no amt of torque will remove the bolt. I wonder if something like that is possible with CI. I'm assuming by friction welding, you mean galling or do you mean actual welding of the materials? I'll look for...
  11. awhicker84

    Cast Iron pipe tap

    I can't find the exact type of material. The engr dwg states cast steel, but the actual part PMI'd as CI
  12. awhicker84

    Cast Iron pipe tap

    The part is big, but the area is of error is in a small space. It is a bolt circle around a bore. The bore size is within .0005" and is aligned to another bore within .001" about 25 inches away. PWHT is not an option.
  13. awhicker84

    Cast Iron pipe tap

    Ladies and gents, I have a cast iron part that was mis machined. There were thru holes drilled into the part that need to be 'removed'. So we are going to pipe tap the part and install plugs. My question: What is the best type of material to use for the plugs to create a seal? The plugs...
  14. awhicker84

    Rotating Equipment - Polyethylene erosion on steel shaft

    As far as PWHT, I'm trying to pull the mat'l certs and see what temperature we tempered at. We will base the PWHT off of that if we weld repair with a WPS for carbon steel. I will have to talk with weld engineering if we do anything that inconel overlay. I'm not sure what type of heat treat...
  15. awhicker84

    Rotating Equipment - Polyethylene erosion on steel shaft

    It is A-668 Class D. It's an interesting choice of steel given that nothing is specified on the chemical req's except: Mn, P, S. However, we limit our carbon content to 0.35% per S4 of the ASTM spec.
  16. awhicker84

    Rotating Equipment - Polyethylene erosion on steel shaft

    It should be noted that we have an aluminum laby seal (non-rotating) that has a small clearances against the vertical wall (rotating). I did not design this, but I'm assuming this exists to reduce the chances of our erosion issues. This design is non-std. I do not know what the aluminum seal...
  17. awhicker84

    Rotating Equipment - Polyethylene erosion on steel shaft

    Hi all, Reference thread: http://www.eng-tips.com/viewthread.cfm?qid=63814 We have a machine that is eroding in one area of the shaft. The process is mostly ethylene. The erosion caused a radius cut in a step area of the shaft such that material is being taken away in a J shape and the...

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