Forging identification
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I would like to ask the experts: how can one determine whether a fitting is forged or machined? For example, how can one distinguish between a forged flange and a flange that has been machined on a lathe? And how can one differentiate between a flange that has been semi-forged and one that has been fully forged?
Welcome to the original poster to discuss further; it’s necessary to have random data for convenience.
. . . . Lathe machining after flange forging
There isn’t much precision forging of pipe fittings; most of them are machined after forging. There’s no difference in appearance; let’s make test specimens.
It can be seen right away without any mechanical processing of the forgings – there is a layer of high-temperature oxidation on the surface of the components, as well as signs of rolling ? ? ? ? ? . . . . . . Flanges forged directly, without mechanical processing, should be difficult to use directly. If high standards are required for the flange, it needs to be forged; after forging, mechanical processing is carried out. To distinguish it from flanges that have not been forged, one can examine the microstructure – the crystals in the forged flanges are smaller and more refined. I’m not quite sure what the original poster meant