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  1. Carburize

    hardness values

    Correct concerning the sphere. The non martensitic product will most likely be bainite rather than austenite.
  2. Carburize

    9310 carb

    Without a deep freeze option you are always going to have a hardness problem. For a sample of 9310 with a chemistry in the middle of the specification range at a case carbon of 0.8% the martensite transformation will not be even theorotically complete until the case is cooled to below minus 20C...
  3. Carburize

    hardness values

    The "ideal diameter" is a term developed by Grossman in the late 30's to describe the hardenability of an alloy and represents the diameter of an infinitely long bar which will quench to 50% martensite in the center.
  4. Carburize

    4130 flame hardening

    If it is a severe erosion problem you might want to consider ceramic sleeves and some kind of locking nut to hold them in place.
  5. Carburize

    Narrow Groove welding technical details.

    There are lots of details in Chapter 5 of "Developments in Pressure Vessel Technology-3" Edited by R W Nichols - Applied Science Publishers - London
  6. Carburize

    hardness values

    At mid range of the analysis for these two alloys the ideal diameter is about 85-mm for 100Cr6 and about 230-mm for 100CrMn6 resulting from higher silicon and manganese. For a 64-mm ball therefore I would expect to see approximately the same hardness profile for both alloys which would be...
  7. Carburize

    Stress test in steel pipes

    Vfigueroa - do you mean pressure tests??
  8. Carburize

    NDE Before or After PWHT?

    Agree fully with metengr - depending on the size and shape of the vessel and the uniformity of the PWHT fairly severe thermal stresses can be set-up during this "final" operation which have been observed on numerous occasions to cause cracking.
  9. Carburize

    Shaft fracturing

    I think you need to go in the other direction and try to find the source of the torsional exitation and eliminate it.
  10. Carburize

    Electrolatic Corrosion?

    I think you mean galvanic corrosion due to the connection of a more noble (more corrosion resistant) material. Generally the galvanic couple tends to cause the less noble material to corrode more rapidly but the effect is dependent on the surface area of the two materials and a small area of...
  11. Carburize

    Shaft fracturing

    RUFUS2K - It has all the hallmarks of a torsional fatigue failure.
  12. Carburize

    Shaft fracturing

    RUFUS2K - can you post a side view of one of the fracture and perhaps try one from just a little further back from the fracture face to get a better focus?
  13. Carburize

    Duplicating a Gear...?

    Gear repair shops are now beginning to use sophisticated CMM machines to get the required data, eliminating the need for measurements over pins.
  14. Carburize

    Shear strength of EN24T (817M40T)

    Both EN 16T and EN 24T have tensile stengths of: Yield 98560 psi min Ultimate 123200 - 145600 psi. Perhaps someone can suggest a reasonable relationship between this data and shear properties.
  15. Carburize

    Shaft fracturing

    The "star shaped" pattern of crack growth is characteristic of torsional fatigue - reference ASM Handbook Vol 10 8th Edition page 379 figure 7
  16. Carburize

    Brake rotors cryogenically treated

    The thermal conductivity of flake grey iron is actually only 2/3 that of steel!
  17. Carburize

    Pipe Pressure Ratings

    Is there a minimum pressure in ASME B31.1 below which the piping is not considered "pressurised"?
  18. Carburize

    Recommended temperature of the material to test for hardness

    I searched E 10 but can find no reference to test temperature - logic says ambient
  19. Carburize

    Iron Dilution?

    There does not appear to be great deal of logic however, I would think that you would have no problem meeting the 10% iron level in the 625 weld metal on top of 825. Typical dilution levels of base material into the weld deposit should be well less than 20% so that is only a maximum of 5.5%...
  20. Carburize

    Al content in low alloy steel forging

    In your application I would specify an 0.035% max aluminum level this is typical of the value from other oil field users.

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