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  1. Dyskolos

    Tensile Test Variability and Load-Time Curve Discontinuity

    We've decided to look for an alternate supplier, and I'll be tightening up our testing requirements for future qualifications. Thanks all for the info and assistance!
  2. Dyskolos

    Tensile Test Variability and Load-Time Curve Discontinuity

    Got some answers, but they don't make much sense. I'm setting up a call with the vendor to clear some of this up; it appears e-mail is insufficient. They stated that they were unable to provide a stress-strain curve because the machine only provides L-T. The machine is listed on the cert. as...
  3. Dyskolos

    Tensile Test Variability and Load-Time Curve Discontinuity

    Thanks for more good info! I'm reaching our for more info from the vendor, but they've not been particularly responsive so far, so it could be a day or two. MagBen, I know I would expect a straight line in the elastic zone of either stress-strain or load-elongation diagrams, but is this true in...
  4. Dyskolos

    Tensile Test Variability and Load-Time Curve Discontinuity

    Ed, Thanks for the information, that helps a great deal. I can see I need to spend some quality time with ASTM E8 to better specify our procedures. I unfortunately do not have the strain rate or the modulus on the provided cert, but I can certainly ask for them. Thanks again!
  5. Dyskolos

    Tensile Test Variability and Load-Time Curve Discontinuity

    Hello, I am reviewing testing certs from a potential new vendor for metallurgical testing, and have identified a potential issue. The material is 4130, approximately 21 HRC. I have two questions on which I would very much appreciate any assistance y'all would be willing to give: 1) The yield...
  6. Dyskolos

    Parallelism to cast surface designated as datum

    Pylfrm, -Looking back, I am confused my own self what I was thinking regarding the interaction of the datums. Please write that off as nonsense. -Regarding C as primary datum; what about the drawing marks it as such? -The original drawing carries a note to interpret the drawing in accordance...
  7. Dyskolos

    Parallelism to cast surface designated as datum

    I think I may have answered my own question regarding datum A possibly being convex; I would have to apply flat planar datum simulators to all three datum features specified on the drawing (may end up somewhat different depending on how the customer wants me to handle datum C, but I think I've...
  8. Dyskolos

    Parallelism to cast surface designated as datum

    pmarc, That makes sense. I will ask the customer to clarify. Chez311, I agree datum C is suspect; will ask the customer to clarify. Regarding datum A: Ok, using a flat planar datum simulator (such as a surface plate) makes sense. Question: Hypothetically, if the surface ends up irregular in a...
  9. Dyskolos

    Parallelism to cast surface designated as datum

    To clarify, this is not my design, nor that of my company; we are a contract manufacturer, and thus have only a limited ability to effect drawing changes. I don't have castings as yet to see what the surface will be like; I am in the preliminary stages of this project, but I am near-certain...
  10. Dyskolos

    Parallelism to cast surface designated as datum

    I appear to be having trouble uploading the attachment. Trying again here. Edit to add: Attachment shows up for me now. I think I failed to click the "insert link into your post" button on my initial...
  11. Dyskolos

    Parallelism to cast surface designated as datum

    All, I have a part that my company is manufacturing for a customer, and have a question regarding the GD&T that appears on the print. I have prepared a drawing showing a similar setup to the part we are making; please see attached. This drawing is not fully dimensioned; I have only included...
  12. Dyskolos

    Nitronic 50 HS stress relief?

    Ed, Thank you for confirming my suspicion that this is likely not an acceptable practice, at least not without prior customer approval. You are correct; the spec does not specifically allow for stress-relief. It does not explicitly prohibit it, but I figured there was a reason for the lack of...
  13. Dyskolos

    Nitronic 50 HS stress relief?

    Hello, The company I work for is manufacturing (on contract; we do not own the design) several components from Nitronic 50 HS (120 ksi yield). To ease our machining operations, it has been proposed that a stress relief (900F, 1 hr/inch of thickness) be performed partway through the machining. I...
  14. Dyskolos

    316/316L EBW difficulties and MTR discrepancies

    TW already no-quoted us, but that was asking for .005 to .017%. We will amend our RFQ to see if they have <.005 Thanks
  15. Dyskolos

    316/316L EBW difficulties and MTR discrepancies

    Ed, The only place I can even find restricted sulfur 316 online is with Carpenter. Can you advise any specific suppliers? Perhaps we are looking in the wrong places. Our industry is Oil and Gas and this seems to be an unusual requirement in this industry.
  16. Dyskolos

    316/316L EBW difficulties and MTR discrepancies

    All, Thank you for your assistance so far; can I trouble you with some additional questions? We are unable to source material with the sulfur content in the required range. We have tried all of our usual suppliers, as well as anyone else we could think of. Carpenter was the only company to...
  17. Dyskolos

    316/316L EBW difficulties and MTR discrepancies

    I would not mind doing that at all, but it would require a concession from our customer. In my experience they are reluctant to do so for established product lines.
  18. Dyskolos

    316/316L EBW difficulties and MTR discrepancies

    Ed, We are at .026% (max allowable is .03%)on the sulfur for this heat, so I think you may have nailed it. I don't see any obvious inclusions, but perhaps the "depressions" or "pits" are a result of inclusions? I will source some material with a sulfur content in the .01 range and see if our...
  19. Dyskolos

    316/316L EBW difficulties and MTR discrepancies

    Ed, I'm not sure what you mean by annealed meaning that it meets spec. The spec requirement is for annealed bar, but I have what I suspect to be annealed and cold-worked bar. Tensile properties from MTR: 39.3ksi YS, 87.2 UTS This is in line with what I would expect for annealed bar, but it is...
  20. Dyskolos

    True position interpretation

    Mkski, I understand your comment, but it is not my (or my company's) design and I can only make educated guesses about the part's function. My inquiry was limited strictly to interpretation. Please also note that this is a severely abbreviated drawing; I included only the dimensions and features...

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