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  1. geoffriong

    Core Hardness of 5120 Steel

    Anyone have a rough estimate of what an expected core hardness would be of a 3/8" section 5120 or 5120H steel carburized then quenched and held at 480-500 F? Tried an online search but couldn't find good info. Thanks in adavnce.
  2. geoffriong

    Semi-Processed Electrical Steel Properties

    Here is some more general info: It is M-47 Semi-processed non-oriented electrical steel. Gage: 0.0185" +/-0.0020. I think the 26M47 is a supplier part number in place of an actual standard, my mistake. ASTM 26S200 is also reference for this material but all of the data I have found for Core...
  3. geoffriong

    Semi-Processed Electrical Steel Properties

    Thanks for the reply and info. I downloaded the spec and it only contains data after the quality anneal. I am particularly interested in an estimate for Core Loss before annealing. Everything I have read states, very, very clearly that when using a semi-processed steel a post-process anneal...
  4. geoffriong

    Semi-processed Electrical Steel

    Thanks for the fast reply. I am particularly interested in an estimate for Core Loss. Everything I have read states, very, very clearly that when using a semi-processed steel a post-process anneal is required to achieve full magnetic properties. I am dealing with a situation where we are...
  5. geoffriong

    Semi-processed Electrical Steel

    I've tried a search on the internet and do not have access to any technical manuals (I'm away on business). Does anyone know where I can find technical data on semi-processed electrical steel BEFORE the quality anneal? The material is specifically 26M47. I emphasize the 'before' because there...
  6. geoffriong

    Semi-processed Electrical Steel

    I'm not sure this is the correct forum and I've tried a search on the internet and do not have access to any technical manuals (I'm away on business). Does anyone know where I can find technical data on semi-processed electrical steel BEFORE the quality anneal? The material is specifically...
  7. geoffriong

    Semi-Processed Electrical Steel Properties

    I've tried a search on the internet and do not have access to any technical manuals (I'm away on business). Does anyone know where I can find technical data on semi-processed electrical steel BEFORE the quality anneal? The material is specifically 26M47. I emphasize the 'before' because there...
  8. geoffriong

    Carburizing Atmospheres

    The endo would be from a standard generator. Thanks, Geoffrion
  9. geoffriong

    Carburizing Atmospheres

    I am looking for a study with supporting data that compares heat treat results between nitrogen-methanol systems vs. endo-gas atmospheres. Other than operating cost advantages/disadvantages, is there a process control benefit to one system over the other? I appreciate anyone with experience...
  10. geoffriong

    Retained Austenite

    Maui, Actually, no speculation is needed and the group has answered my question perfectly. My question was more for general knowledge than for an actual process. Thanks again to those that posted info!
  11. geoffriong

    Retained Austenite

    What are the principle causes of retained austenite of Q&T steel and what are the normal process adjustments that can be made to eliminate it? Thank you in advance.
  12. geoffriong

    Thin Section Heat Treating

    I am interested in a standard process for the carburizing and oil quenching of a thin section steel (10B21). The part is a pinion with section sizes varying from 2.1mm to 4mm. Other than part geometry, what else can be done to avoid cracking in the quench? Thanks in advance for any information.
  13. geoffriong

    Vacuum Nitriding Soft Spots

    I am interested in possible solutions to soft spots that appear after a vacuum-nitriding process. What types of chemical or pre-treatments should be considered and/or avoided? What are other process failure modes that could cause soft spot? Assume that the base metal is within spec before...
  14. geoffriong

    10B21 Steel Hardening

    We cold form, carburize and austemper pinions for automotive starters with great success using 10B21. Carburized, austempered surface hardnesses are typically in the 54-56 HRC range, while core hardness is 41-46 HRC. The parts have excellent wear resistance and great impact properties. Our...
  15. geoffriong

    10B21 Steel TTT curve

    Does anyone know where I can find a 10B21 steel TTT curve? Thanks in advance.

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