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Recent content by mrfailure

  1. mrfailure

    What is meaning of TS B7

    Are you in China? Search engines may be restricted in that case. As for the "Tensile Strength" you saw in AI, this is a great illustration of why you should not believe everything it comes up with. Know that quality dictates every fastener manufacturer put their mark on the head.
  2. mrfailure

    Unknown steel

    It is possible that the plant constructor is referring to their own material designations within their system. For example, Westinghouse and GE used their own designations in drawings even if the material used was nonpropriatary. In the case of Westinghouse those designations continue in all of...
  3. mrfailure

    Determining the Fracture Mode: Brittle Fracture vs. Fatigue in a Pump Shaft

    ASM publishes a handy fatigue fracture chart in the Fractography volume of ASM handbook that has been printed many places. Here is one of the links to Fastenal that printed it: https://www.fastenal.com/fast/services-and-solutions/engineering/fatigue Fatigue zones lead from origin to the final...
  4. mrfailure

    What type of Corrosion

    Have you eliminated the possibility of microbiologically-induced corrosion? This seems a localized area that was attacked that would not make me think of general pitting corrosion.
  5. mrfailure

    Determining the Fracture Mode: Brittle Fracture vs. Fatigue in a Pump Shaft

    Your should pay attention to Ed's comment. There are definite beachmarks at the 2:30 position that indicate a fatigue origin. This is at the outer edge of a feature that may have once been a keyway though it may have distorted over time or from the failure. Most of the fracture looks like...
  6. mrfailure

    Determining the Fracture Mode: Brittle Fracture vs. Fatigue in a Pump Shaft

    Your should pay attention to Ed's comment. There are definite beachmarks at the 2:30 position that indicate a fatigue origin. This is at the outer edge of a feature that may have once been a keyway though it may have distorted over time or from the failure. Most of the fracture looks like...
  7. mrfailure

    Positive Material Identification (PMI)

    You cannot put the PMI probe on an unprepared surface - results will be nonsense. You have to grind away surface contaminants and oxides first.
  8. mrfailure

    Carbon Content

    There is not a need to post a minimum carbon provided it is a sufficient amount to meet mechanical property requirements. You did not say whether you also met yield and elongation requirements but if you did, then you can be assured there is sufficient carbon in the steel
  9. mrfailure

    CT Corrosion

    I wonder if real world environmental conditions are simply too harsh to use unpainted stainless steel as on Cybertruck. It easily shows up dings and imperfections as compared with painted/coated surfaces, and as this thread notes corrosion can occur if conditions are not perfect. (Personally, I...
  10. mrfailure

    Hardness Values - API

    ASTM A370 only reports equivalent tensile strength for steel hardness, not yield strength. There may well be some proprietary equivalency but I do not think it is reported in any standards. This is the standard of your customer so you have to make sure you meet it.
  11. mrfailure

    11SMnPb30 Material equıvalent and heat treatment about.

    This steel is not intended for heat treatment. You probably should first google before asking the question. Your answer is in the attached link https://www.steelnumber.com/en/steel_composition_eu.php?name_id=156
  12. mrfailure

    Aluminum Tested at 100ksi UTS

    When you cut a strip out, it then has to be flattened to pull the tensile unless your wall is thick enough to machine a flat. This can skew results. With a tube like this, I prefer to test it full cross-section if possible.
  13. mrfailure

    EN 10025 S235JR Plate in US

    ASTM A36 is equivalent to S235JR. Make sure you are meeting all your requirements if you use this.
  14. mrfailure

    Axle failure, thoughts

    The failure point where the shaft diameter has stepped down is typical and expected in shaft failures, especially fatigue. This is the point where stress is highest, and not in the corner itself. Visually it looks like fatigue with multiple ratchet marks at5 the OD indicating multiple origins...
  15. mrfailure

    Failure of Wind Fence due to corrosion

    Dave, I can see how the scenario you paint can work. Galvanizing is a sacrificial layer. Once it is eaten away, you will get corrosion of the steel substrate. Is the environment this particular fence sees any harsher than the other fences you installed? I suggest looking at why the screw heads...
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