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  1. davidmoul

    Fe Ni 48 (supra - 50): magnetic annealing

    Many thanks for your help, In fact, we use these laminations in stack, and we have a very tight tolerances on the inner diameter (35 mm diameter). What kind of dimensionnal variation should I expect on such diameter, for a Magnetic annealing (1100°C) and oxydation. I will check the tolerances...
  2. davidmoul

    Fe Ni 48 (supra - 50): magnetic annealing

    Hi guys, just a simple question: during the magnetic annealing of Fe-Ni 48, Do I have to expect some dimensionnal variation on thin laminations (heat treatment at 1100°C under controlled atmosphere). I'd like to know if I need to adapted the tooling to prevent a deformation of the lamination...
  3. davidmoul

    Resistivity of 35CD4 and 30NC11steel

    Hi, everything is in the title: I'm looking for the resistivity of a 35 CD4 and 30NC11 steel? Does anyone know one reference where I can find this data? I have to say that I spent quite a long time to get this information, without any success... Many thanks in advance for your kind help!
  4. davidmoul

    316L Nace specification

    Thank you. I as not sure for this. I've seen that the martensite content "should be" limited. I was not sure about the martensite content that could be found into the 316L. Schaeffler diagramm indicate that 316L is far 100% austenitic, I was wondering when can martensite appears. Many thanks...
  5. davidmoul

    316L Nace specification

    Hi guys, I'm writting a specification in order to get some 316L material for NACE application. In the norm MR0175, it is specified that martensite content of this grade has to be kept under a certain amount. I'm trying to fix the value, but I'm not finding any information about this. Does...
  6. davidmoul

    CO2 Corrosion test

    Many thanks for your help, I will see with this ASTM doc what I can do..
  7. davidmoul

    CO2 Corrosion test

    Hi guys, does anyone know a way to do a wet environement CO2 corrosion test? Seems that Carbonic acid (formed into the water by the CO2) is not stable and that there is no way to qualify the compatibility of some material with wet environnement + CO2... any clue?
  8. davidmoul

    NACE and Inconel

    Hi guys, just a quick question to poweruser of the NACE MR0175 norm, as I would like to be sure of that: In case of using an Inconel 625 in annealed condition, there is no hardness requirement for the base material and for the welds? For the base material, paragraph 6.2.2 says that the limit...
  9. davidmoul

    Availability of Carpenter electrical iron and various stainelss alloys

    I was (I am actually but I lost hope...) looking for some 430FR in large dimensions to make large electromagnet, but it was impossible someone that can provide quantities for testing... The only way to get some would have been to order a complete batch (20 tons!). If you find some, I would be...
  10. davidmoul

    CO2 Corrosion testing

    Hi guys, does anyone know a normative test (like salt brine) which could be used to evaluate the resistance of some polymers to CO2 corrosive (=humid) environnement? I'd like to qualify some electrical insulation in such environment, but I don't find any standard test procedure. Does someone...
  11. davidmoul

    Tangent Modulus

    In fact the tangent modulus is E(epsilon). It changes for every value of epsilon. If you want to do a significant simulation, you need to get the practical tensile curves with the right parameters of your material.
  12. davidmoul

    Need help selecting a high temp plastic

    I don't really understand the need, cause such rest are existing in the archery industry. You can find some cheap one in plastic, and some more sofisticated with a moveable part. What do you want to improve this way?
  13. davidmoul

    CO2 corrosion

    Thank you, I will order this norm. In fact having a look on the internet on this norm, it seems to be exactly what I need (used by some of our customers). Once again, many thanks for this really helpful information. David
  14. davidmoul

    Compatibility of polymers with Carbonic acids

    Thank you for your help, in fact, it is for a CO2 application (99% of CO2, <1ppm of water) at relatively low temperature (40°C) and pressure (3 bar), so there should not be liquid water, so no acid. Anyway, during the tests phases, the machine can be open for inspection a couple of time...
  15. davidmoul

    Compatibility of polymers with Carbonic acids

    In fact I'm looking for the polyesterimide, which is considerer as a modified polyimide by the manufacturer, and as similar properties in terms of corrosion. Thank you for your help.
  16. davidmoul

    Compatibility of polymers with Carbonic acids

    High guys, I'm looking for some compatibility charts for some polymers with carbonic acid (to use these polymers in a wet CO2 environment). Where can I found these data for: Polyesterimide? Epoxys? Polyimide? You will certainly tell me it depends of the exact polymer (especially for...
  17. davidmoul

    CO2 corrosion

    thank you for your answer... The fact is that our spec indicate that the treated gaz will be pure CO2 without any water (less than 1ppm). No ris of CO2 corrosion during the process... However, what we know really wel is that the spec is never representing reality, especially in the oil and...
  18. davidmoul

    Polymer compatibe with Carbonic acid

    Thanks guys, In fact I'm checking if our actual technology is compatibe with CO2 compressing application. That mean, in case of water, formation of Carbonic acid. So in a first approach, I tried to check data about carbonic acid compliance for all material used into the machine. I'm looking...
  19. davidmoul

    Polymer compatibe with Carbonic acid

    Many thanks for your help, Concerning the 200 bars, we are still dealing with that problem. Here we will change the gaz environment, and want to be sure that there is no major problem with our machines. I will check the charts. many thanks for your help
  20. davidmoul

    Polymer compatibe with Carbonic acid

    Hi guys, all is in the titel: I'm looking for polymers compatible with carbonic acid, at temperature up to 100°C, and pressure up to 200 bar. Do you have any clues where I can find litterature on this topic?

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