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  1. ornerynorsk

    Porous Gold

    Passive diffusion of metal atoms through other metal atoms? at room temperature? It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
  2. ornerynorsk

    Cast iron for gears

    With a cast iron or cast steel gear, you really must plan to do final machining on it. An as-cast surface is not acceptable for accuracy and surface finish. If you could get a gear set to run as-cast, your clearances and backlash would have to be set too far open, it would be very noisy, and...
  3. ornerynorsk

    Cheap, Ferrous Spring Steel?

    Any corrosion resistance or other properties that would eliminate certain choices? Many plain carbon steels can be made into springs easily and cheaply. It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
  4. ornerynorsk

    Can automotive part casted with pure zinc??

    First of all it would be worthwhile to calibrate any instruments you are using for analysis. In my mind, there would be no advantage to use pure zinc for anything except plating anodes. The alloys all have superior properties, as others have stated. Any reason to do so would have likely been...
  5. ornerynorsk

    Is 17-4 PH, aged at H900 Suitable for a Wrench like Tool? Or is H1025 Better Suited

    Wow this must be some kind of wrench. 200-300 ksi ??? 4140 has been my go-to for almost any kind of a special tool. If you need localized hardness to prevent wear/fretting, it can be further flame or induction hardened. It's "mildly" corrosion resistant, depending on what your notion of...
  6. ornerynorsk

    Hardening of carbon steel with time

    Subtle changes can be observed in drawing quality steels over months-to-years. Nippon/Sumitomo, for one, makes reference to this in one of their catalogs. We've also experienced this with AKDQ tube in severe bending applications where we cannot store material more then several months without...
  7. ornerynorsk

    cracks in malleable iron threaded 90° elbow

    Do not think these are dryseal (NPTF), just common NPT. It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
  8. ornerynorsk

    cracks in malleable iron threaded 90° elbow

    "Overtightening will most typically either induce circumferential cracking at the base of the threads or angled cracking from the resolved shear stress." Hmmm, I've seen a lot of "popped" fittings in my day, and the ones that get over-tightened look exactly like the example shown. An analysis...
  9. ornerynorsk

    cracks in malleable iron threaded 90° elbow

    Also, some perspective in the scope of things would be helpful. Judging by the woodgrain pattern of the table this is lying on, it does not look like a large fitting. Class 150 is a relatively cheap fitting. Is it cheaper just to spend the money to replace them instead of spending a couple...
  10. ornerynorsk

    cracks in malleable iron threaded 90° elbow

    Yes, understood, thank you. Do you have any new fittings from the same lot that you could benchtest yourself to gain some foreknowledge before tensile and metallurgical analysis? Short of the supplier being able to provide better certs or documentation, labwork is probably the only way to...
  11. ornerynorsk

    cracks in malleable iron threaded 90° elbow

    Have seen this before and assumed it was from massive over-tightening. Good lord some of those monkeys don't know when to quit turning the wrench. It's either that or they forget the pipe dope and figure they can "make" it seal by giving it an extra half-turn. Curious as to whether you found...
  12. ornerynorsk

    washed out linseed oil after leak test

    Dawn dishwashing soap It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
  13. ornerynorsk

    Who else is seeing price gouging in metals?

    With the tariffs a month on, I'm curious if anyone else is seeing blatant price gouging in ferrous and non-ferrous materials? I'm presuming that at least some on this forum are involved in purchasing and supply contracts. The Coalition for a Prosperous America, a group that I must admit that...
  14. ornerynorsk

    What alloys are covered in Trumps "steel and aluminum" tariffs?

    Nice to see how the domestic producers are already taking full opportunity and raising their prices by 30 to 50% on many commodities. Just giving us more reason to buy from China. Idiots. In a pissing contest, everyone gets wet. It is better to have enough ideas for some of them to be wrong...
  15. ornerynorsk

    AR steel resistant to grinder attack?

    Strategically placed tungsten carbide rods will slow down the would-be thief. Also, along the lines of the layering/sandwich idea. Some thick natural rubber or other elastomeric product sandwiched into the steel would not only gum up the grinding disc, but it's going to stink and smoke...
  16. ornerynorsk

    Steel alloy choice for wood fire service?

    Galvanized would be a waste of money, it'll burn off with the first fire and produce a not-so-pleasant smoke. It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
  17. ornerynorsk

    Steel Slabs

    Well that's the allure of buying offshore, everything is cheaper. But you can't go selling bloom and slab out of the trunk of your Buick in the South Bronx and expect to make a decent living out of it. Like Ed said, you have to find the market, and the market probably isn't there. It's much...
  18. ornerynorsk

    Casting within a casting

    Btrueblood, yes. I used to do a bit of both cold and hot flame spraying back in the '80's. Just a thought. It's a nice way to add hardness and abrasion resistance on a cheap substrate. An amazing variety of materials is available. It is better to have enough ideas for some of them to be...
  19. ornerynorsk

    Casting within a casting

    Eutectic coating? It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.
  20. ornerynorsk

    Hardenability of different raw materials.+

    In addition to the material, process controls are also critical. It is better to have enough ideas for some of them to be wrong, than to be always right by having no ideas at all.

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