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Recent content by Grelling

  1. Grelling

    Gas formation at Grade C12A steel casting

    Re thread408-73462, I would like to know how this gas formation appeared. It may have many causes. Melting, desoxydation, paint, sand binder, fines, sand, humidity of sand.
  2. Grelling

    Low temperature impact testing - 13/4 stainless

    You should take care that the retained austenite will be still present when testing. The retained austenite brings the toughness.
  3. Grelling

    Engine Block Question

    Hi, regarding dirt in iron foundries. I worked in several iron foundries many years, the job is dirty but people are friendlier, because the white collar types stay outside. And if they try to enter with "management games", the foundry will show red figures because quality depends on...
  4. Grelling

    Smith diagram for 3CR12 steel

    Hello, I suggest to investigate the metallographic structure of the T joint. The family of 13% Cr-steel do not have the same stability in structure like a normal carbon steel, mainly because of presence of more or less retained austenite. regards P. Grelling
  5. Grelling

    The amount of Inoculant use per weight of Nodular Iron poured.

    Generally, inoculation is really the best if applied as late as possible. If you add it to the gate, the first iron passing will not react because the inoculant must melt before it will act. That means, this makes only sense for larger castings where the uninoculated prime iron will lateron be...
  6. Grelling

    The amount of Inoculant use per weight of Nodular Iron poured.

    The effect of inoculation is fading with the time between the inoculation and the moment of pouring. If you have a device that adds the inoculant to the pouring jet of liquid iron, an addition of 0.2 % of inoculant should be sufficient *) to avoid carbides provided the analysis shows no Cr-level...
  7. Grelling

    Engine Block Question

    Flake graphite cast iron can be cast very thin walled which reduces weight of the motor block close to motor blocks made of aluminum, because the composition and metallurgy of flake grey iron can be adjusted to be nearly no need of risering. This can't be done with steel castings nor with...
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