Best type of finish for an MP5 clone? - Page 3
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Thread: Best type of finish for an MP5 clone?

  1. #21
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    It would be about $250 for just one single gun. We would need more to reduce the cost.

  2. #22
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    How many more?

  3. #23
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    Over 4 would start seeing price breaks.

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  5. #24
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    So, dumb question I know, I looked up nitriding---how durable is it? And is there an industry standard process?

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    I could come up with 4-5 but depends on the break. Good question Cjude! How durable is it?

  7. #26
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    Black Nitride hardens the surface of the steel. How deep and how hard (LOL) depends on the steel alloys and the process temperature and time. You could expect over 45RC to a minimum depth of .0004". Most cases its over 50 and a couple thou deep. The black process is the second step, and is darker than bluing and phosphating. The harder steel and chemical change in the surface leads to increased corrosion resistance.

  8. #27
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    so then it couldn't be done on an A3 stock with plastic at the end?

  9. #28
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    The process happens in a liquid salt bath between 900 and 1200 degrees Fahrenheit. No plastic or aluminum is compatible.

  10. #29
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    Quote Originally Posted by NoScoE30 View Post
    The process happens in a liquid salt bath between 900 and 1200 degrees Fahrenheit. No plastic or aluminum is compatible.
    If parts like the trunnion are supposed to be as hard as 60 HRC, how can correct tempers be maintained in a 900-1200° salt bath?

  11. #30
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    Quote Originally Posted by Handy View Post
    If parts like the trunnion are supposed to be as hard as 60 HRC, how can correct tempers be maintained in a 900-1200° salt bath?

    This is quoting H&M Metal Processing. I am waiting on the heat treat spec for the trunnion.

    "Q: What is the effect on the core hardness?
    A: If the core region's depth is not influenced by diffused nitrogen, the degree of tempering associated with time and temperature during the Black Nitriding cycle determines change in core hardness as follows:

    1. Additional tempering occurs during Black Nitriding if the pre-hardened component has been pre-tempered below the subsequent Black Nitriding temperature. Reduction in core hardness depends primarily on the steel grade used and attendant-tempering characteristics.

    2. If the pre-hardened component is pre-tempered, or non-pre-hardened above subsequent temperature, core hardness will not change significantly as a result of the Black Nitriding process."

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