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Recent content by tm0284

  1. tm0284

    can anyone identify this steel chemistry

    Thanks. Do you know if there are there any other common alloys that it might fit as well?
  2. tm0284

    can anyone identify this steel chemistry

    i was wondering if anyone could help me identify the grade of this steel. spectrometer chemistry is shown below. could this be a2 tool steel? C - .94 Mn - .62 Si - .23 Cr – 4.97 Mo - .97 V - 0.17 Cu - 0.13 Ni - 0.13 Al - 0.03 trace niobium (0.002)
  3. tm0284

    Frequency of Measuring Pipe Expansion Ratio

    I was wondering how often does API 5L require calculation of the sizing ratio? Is calculation of the sizing ratio the only requirement to verify the expansion? Since the sizing ratio is determined by taking measurements on the outer diameter, do the same rules apply for validation of...
  4. tm0284

    Question regarding macro-etch pattern

    Thanks metengr. I had always suspected it was due to uneven echant application because of poor grinding /surface preparation but wasn't sure. While on this topic, do you have any reading recommendations or tips for interpreting the Mannesmann scale, particularly in cases where an image appears...
  5. tm0284

    Question regarding macro-etch pattern

    This macro is of a HSLA steel. On the left 1/3 of this macro a smooth grey surface can be seen. On the right 2/3 the surface is patterned with with white, grey, and black. I've seen numerous macros where the entire surface looks either like the left, or the right, side of this photo. I...
  6. tm0284

    Charpy Impact Testing

    Have you polished and etched a piece to look at the grain size? That should help you in determining why it didn't pass.
  7. tm0284

    Plate Cracking during torch cutting

    Just to clarify, the cut was 10foot by 10foot, not 10" by 10". Do you think the residual stress issue still applies?
  8. tm0284

    Plate Cracking during torch cutting

    I am not sure the cutting speed or conditions. Two small squares, aprox 10' x 10' was cut from the original full size plate. One had crack extending from the corner towards the center of the plate about 4inches. The other square had smaller cracks, less than 1" long, in 3 of the 4 corners...
  9. tm0284

    Plate Cracking during torch cutting

    Any ideas?
  10. tm0284

    Plate Cracking during torch cutting

    Grade is A572-65. Carbon content around 0.1 and carbon equivalent of about 0.5. It was in the as-rolled condition, no heat treatment or stress relieve of any kind performed on the plate. Thickness of plate is 5 inches.
  11. tm0284

    Plate Cracking during torch cutting

    A low alloy carbon steel plate was torch cut which resulted in cracking. This plate should of had a ferrite / pearlite structure and was not heat treated in any fashion. The plate passed ultrasound testing. What would cause this cracking to occur? The largest crack extended about 4 inches from...
  12. tm0284

    TM0284 - HiC test procedural questions

    Sorry, messed up on the previous post. I see no way to edit posts so trying this again.
  13. tm0284

    TM0284 - HiC test procedural questions

    Ah, I see. Missed that link the first time. Here is a simple drawing of the setup we have thus far. http://files.engineering.com/getfile.aspx?folder=5b3ce624-a501-41ca-aad7-645da3a0632e&file=Hic_Apparatus.JPG
  14. tm0284

    TM0284 - HiC test procedural questions

    Yes, we have installed wall mounted h2s sensors and have handheld ones for all personal. Explosion risk is also been taken into account and steps taken to avoid such a scenario. We have all the tubing installed with valves just fine. The problem is the actual test vessel itself where the...
  15. tm0284

    TM0284 - HiC test procedural questions

    I am in charge of setting up our facility to do HiC testing. We haven't done the test in over 7 years at my company and most of the equipment left over is unusable. Also many parts of the old procedure are no longer acceptable to our new safety team. I had a few questions and was wondering if...
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