ERW pipe teknuzu chọrọ Nka na ụzụ chọrọ maka mmanụ na gas na-ebufe mmiri mmiri dị ala na-ebufe ihe Gr.b Gr.b Pipe ahu dayameta D<508mm, ± 0.75%;D≥508mm, ± 0.75% D≤168.3, ± 1.0%;168.3<D≤508,±0.75%;Ọkpụrụkpụ mgbidi D 508mm+15.0%:12.5%;D≥508mm, +17.5%, -10% ...
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