Phello ea pickling le passivation nakong ea prefabrication, welding, test, and heat treatment will cause iron oxide, welding slag, grease, le litšila tse ling ho bokella holim'a phala (peipi ea carbon steel, pipe ea koporo ea carbon, pipe ea tšepe e sa hloekang) , e tla fokotsa ho bola hape ...
Bala haholoanyane