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  1. armourian78

    Caustic treatment of silver plated parts

    Hello, I need some advise. We have a rust reworking process which uses a caustic solution (20% sodium hydroxide with water) to kill the rust. In our experience this works very well to kill the rust on tool and chrome type steels we put through this process. However on one particular...
  2. armourian78

    440C, AMS 5880 vs. AMS 5630J, what is the difference?

    We use 440C per AMS 5618 (VAR), AMS 5880 (airmelt), and in the past have used AMS 5630 (airmelt) for bearing applications. The alloy composition of AMS 5880 vs AMS 5630 is almost identical: Only the Copper limit of is different - AMS 5880 0.75Cu, AMS 5630 0.5Cu. However depending on which...
  3. armourian78

    Red Rust on 316

    I love this thread. It made me chuckle. I love the idea of testing passivation on components using H&S! I am already refered to as the mad scientist within my company. I do not need information like this, it will only add fuel to the fire! Now off to find some H&S!!!
  4. armourian78

    Effect of excessive austenitizing time

    The investigation of the parts has revealed, that the grain size is ok (surprisingly is was finer than expected anyway), microstructure revealed no de-carb or carb present, and that the core hardness was within spec and consistent with the surface hardness. Just awaiting retained austenite...
  5. armourian78

    Effect of excessive austenitizing time

    Hi all, I work in the bearing industry. The steel is 52100. The parts were heat treated in a seal quench furnace, with the carbon potential matched to the alloy content to prevent carb or de-carb. The hardening time was 100 minutes, which we would class as excessive as the parts are very small...
  6. armourian78

    Effect of excessive austenitizing time

    Hi all, Our heat treatment supplier, has heat treated some parts and they have had an excessively long austentizing time, the austenitizing temp was correct. We are looking to convert the microstructure to martensite, with a fraction of retained austenite. What are the potential knock on...
  7. armourian78

    Making Matensitic SS Weldable

    I have a question: Is it possible during heat treatment in a vacuum furnace, oil or gas quench for stainless steel parts to fusion weld to one another? Could this happen at around 1070 °C? Specifically: 440C austenitized to 1070 °C. Parts seem to fusion weld to each other, worse with oil but...
  8. armourian78

    Retained Austenite

    I work for a bearing manufacturer, and we are currently doing a lot of work on retained austenite(RA). I confirm that for X-ray diffraction is a reliable method for measuring RA (however the reliably of the technique cannot measure accurately below 1% RA). It is also possible to do growth...

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