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...
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.
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
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.
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...
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...
I used such software way back (in the 90s!) but the library was not very extensive and often took me in the wrong direction. You really do best using reference books. I always first start with the ASM Handbook (Desktop Edition will suffice) to narrow down my alloy type and see what alloys match...
RolMec is correct: You should not be reusing the bolts in the first place. Always install new ones instead as they will not have experienced any degradation of mechanical properties from previous tightening or service. This is your likely root cause of failure no matter the mechanism.
Regarding...
Given the operating temperature, I wonder if graphitization might be an issue for your application in using P1. Though not too likely, graphitization is expected to occur at temperatures above 425 deg. C. Chrome-moly steels like P11 or P22 are not prone to this mechanism as the Cr ties up the...
This is another advantage to using EDS from a mounted cross-section. You can measure coating thickness in the SEM at the same time you are collecting your EDS data.
Ed, is 0.0005" a feasible distance for an accurate OES quantification?
The advantage of using EDS in cross-section is penetration depth becomes irrelevant so you can select the energy you need to identify plating.
With field XRF (aka PMI) you would need toc clean the surface thoroughly of oxides and contaminants that would throw the results off, and also make sure the beam does not penetrate to the substrate, which may also may throw off results. I question whether OES is really viable as well for such a...
There are caveats in the analysis approach I mentioned that I left out to streamline the general approach. Beside OES, ICP (Inductively Coupled Plasma) is often used for quantifying some or all of the elements. Carbon/Sulfur analysis (commercially called Leco analysis) may also be needed in...
When I don't know what I have, I start with energy dispersive spectroscopy (EDS) in a scanning electron microscope. It tells what elements are present in identifiable quantities and will give a rough idea of the quantities, especially if you look at a polished surface in a mount. Once you have...
This question appeared in this forum almost 20 years ago Link. The V does indicate hardened rather than vanadium like I thought; this seems to be equivalent to the H prefix for UNS alloys as the designation does not define mechanical properties itself.
An aside: Why are you assuming only "Gents" are involved in this forum? I really hope women are an active part of our community as well as a large number make up the metallurgical engineering population.
Is the diameter too large to cold roll? Is this product form for this diameter available anywhere in the world? If not, it is clear the material specified is really Unobtainium and you should look for an alternate material as hot rolled 1215 will not cut it.
I need to say explicitly that SA-187 does not exist (equivalent ASTM A187 for heat exchanger/condenser tubes with Grade 5 similar composition was deactivated in 1940). I think this is a typo and you meant SA-182 "Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and...
