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Machubu achitsulo opanda msoko a ASTM A 106 Black Carbon Seamless Steel omwe amagwiritsidwa ntchito pa ntchito zosiyanasiyana zotentha kwambiri
Ku Botop, ndife olemekezeka kukhala nthambi yapadziko lonse ya Hebei allland Steel Tube Group, ndipo tilinso ndi machubu achitsulo osiyanasiyana osasunthika kuti tikwaniritse zosowa za makasitomala....Werengani zambiri