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  1. songshun

    Black oxidize carbon steel

    I've done cold black oxide (same as Caswell), hot black oxide (outsourced), parkerized, cerakote (outsourced), and powdercoat (outsourced). The cold black oxide looks pretty good and is very easy. What I've found is this; the appearance/color-tone of the cold black ox and parkerized finishes are...
  2. songshun

    Weathering steel

    what grade it is? If you know the grade of material, you can google it and find the answer.
  3. songshun

    Die and Tool Design Dimension Tolerance

    the tolerance depends on the request of products
  4. songshun

    Pump shaft material

    316 is good material at this part

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