Properties of 52100 annealed condition? - Page 4
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  1. #61
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    Quote Originally Posted by dian View Post
    imo the seggregation of impurities (sulphides, phosphates, nitrides, oxides etc.) to grain boundaries should not be the main source of embrittlement in 52100 that is usually var/esr (double)melted and often has phosphorus levers < 0.02%. the culprit are rather the proeutectoid carbide networks if they "happen" to have undesireable properties (coarse and continuous). austenite grain sizes of up 1 mm are possible.

    op, i dont doubt you spark testing proficiency (i have none) but did you compare with something more conventional like 4140/1045? imo its very unlikely such a spacer would be made of 52100.

    edit: if you grind 1095 normalized and hardened, does it look the same?
    None of the 52100 made at Timken, Asco, or Gerdau is made var/esr. It's conventional steel making with vacuum degassing. I've stood on the meltshop floor and watched.

  2. #62
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    no idea about timken etc., but first google hit:

    52100 Bar & Tube - Sullivan Steel Service

    btw, do the sparks look between this and this?

    https://youtu.be/6NI6TnA7L_Q?t=18
    https://youtu.be/UzvBPBk2e0o?t=18

  3. #63
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    Dian,
    I do not have a usb camera.

    The sparks are more like the first video, fairly short flares with a multi point burst.
    The second video had long flares with small one or two point bursts.

    I couldn't tell what steel they were grinding given the language of the video, looked like some kind of xx100 series?

  4. #64
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    C100= plain steel 1%C
    105WCr6= 1%C/1%Cr/1%W

  5. #65
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    Parts finally arrived and the diff is going back together.
    I heat treated the washers today and they came out very well.
    Should last for many years without worry.

    Thanks all for the input and information.
    One day I will finish my Practical Machinist apprenticeship and then I will be dead.
    It is truly amazing how much I have learned from the knowledgeable people that post here.

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