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  • Users: mxracer17788
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  1. mxracer17788

    Micro Hardness of Screw Tip?

    Perfect, Thanks.
  2. mxracer17788

    Micro Hardness of Screw Tip?

    Since the screws are short, one initial thought was to mount the screw lying horizontal, and grind away until I'm left with a perfect section view of the screw. Thoughts?
  3. mxracer17788

    Micro Hardness of Screw Tip?

    I have a new prototype for a screw that doesn't seem to be performing as well as the competitors. They are self-drilling screws that are meant to drill into at least two panels of 18 gauge sheet steel. Normally, our self drilling screws have a #3 drill point at the end, but these have a sharp...
  4. mxracer17788

    410SS vs. 316SS vs. Something else?

    Thanks met and ed, huge help!
  5. mxracer17788

    410SS vs. 316SS vs. Something else?

    On another note, is 410 less susceptible to stress corrosion cracking and/or hydrogen embrittlement when compared to austenitic and ferritic stainless steels? I'm looking for good literature on this subject and can't seem to find anything...
  6. mxracer17788

    410SS vs. 316SS vs. Something else?

    Also, I guess just another question: Why use 410 stainless steel to begin with? From my understanding, the corrosion resistance is not good at all. Anyone disagree?
  7. mxracer17788

    410SS vs. 316SS vs. Something else?

    Interesting read TVP, I will definitely have our manufacturing engineers take a look at this. I'm wondering how they attach the 1040 hardened tip to the stainless steel shank? Possibly friction stir welding? Anyway, that might work but I'm assuming cost becomes an issue at that point since 300...
  8. mxracer17788

    410SS vs. 316SS vs. Something else?

    Hi all, Just a quick question for all you stainless steel experts out there. We make a special type of tapping screw from 410 stainless because of its hardening capabilities and our requirement to produce a hardened drill tip. In addition, these fasteners will be used in external environments...
  9. mxracer17788

    Test for bolt straightness?

    Hi all, It has been requested that we add a test in our quality control to assess the straightness of our bolts and screws. Is there a standard way of performing this type of test, and what kind of equipment will be need to order? Thanks a lot, Jeff
  10. mxracer17788

    Magnification to view Microstructures?

    I have a paxit cam installed. Can i achieve 1000x with this unit?
  11. mxracer17788

    Magnification to view Microstructures?

    Hi all, The scope that I have only goes up to 500x total magnification. Is it absolutely necessary to achieve 1000x magnification for analyzing microstructures? The 100x objective is another $2000. In the past, I've used 1000x, but I'm wondering if I an get away with only 500x. Thoughts?
  12. mxracer17788

    Test for Steel Composition

    What is the best test for determining the composition of an unknown steel? I have a sample that I am going to have sent out, and I'm wondering what the best/cheapest method is for determining the composition. Also, what is a good ballpark for how much a test like this will cost? Thanks, Jeff
  13. mxracer17788

    Need Help Analyzing Micrographs.

    I'm sorry it's 1022 steel. And we achieve a core hardness of 42 HRC because the fasteners have a small diameter (0.120") and they are carburized. Essentially they are through hardened but the case is made even harder than the core.
  14. mxracer17788

    Need Help Analyzing Micrographs.

    figured it out nvm.
  15. mxracer17788

    Need Help Analyzing Micrographs.

    Also need to mention this is 1021 steel.
  16. mxracer17788

    Need Help Analyzing Micrographs.

    Hi All, We had two lots of fasteners come in and we did a maximum bend angle on them as usual. One lot (Sample 2012/5/16) was capable of bending the 30 deg. requirement and well beyond in some cases. The other lot (Sample 2012/4/25) was consistently cracking prematurely. Both have a core of...
  17. mxracer17788

    Hydrogen Embrittlement

    Why can't I just use a die nut? I'm only trying to remove zinc coating so that the fixtures can screw in properly. I will leave the coating in tact on the rest of the part where failure will occur...
  18. mxracer17788

    Sending a signal long distance without internet?

    Hi all, I have various stress gauges mounted in a stationary unit and we are trying to design a monitoring system for these gauges. Is there a way to have these units send data over a couple hundred miles without the use of internet? My first thought was radio waves but we would need an awfully...
  19. mxracer17788

    Hydrogen Embrittlement

    I agree with the above and I'd rather not use chemicals to remove the zinc. The HDG is on a 5/8" section of threaded rod and I'm wondering what the best way is to remove this layer mechanically...thread chasers perhaps?
  20. mxracer17788

    Hydrogen Embrittlement

    Hey all, I have bent galvanized rods that I am going to be testing for strain-age embrittlement. I would like to first remove the zinc layer via HCL prior to testing, and I don't want to introduce any other forms of embrittlement. Since it is A36 steel, is it safe to assume that hydrogen...

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