Ffurf hydwyth ac edafeddog ar haearn sydd fel arfer yn cynnwys llai na 0.1 y cant carbon ac 1–2 y cant sorod (slag) yw haearn gyr, haearn gyrru, neu haearn gwaith. Hwn yw un o'r ddau fath o haearn a geir o'i fwyndoddi; y llall yw haearn bwrw.[1]
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