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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...

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...

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!!!

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...

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...

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...

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...

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...