Ngwa ngwa a na-ejikarị eme ihe na mgbaze na ikpo ọkụ nke ọla ndị na-adịghị ferrous na ferrous.Dị ka nkedo ígwè na smelters, nchara nchara, igwe anaghị agba nchara efere, alloy ígwè, ọla kọpa, aluminum, gold, ọlaọcha na aluminum alloy, wdg;Steel na ọla kọpa akụkụ maka diathermy forging, aluminum ingots maka ext ...
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