ERW ashiselwe steel pipe: high-imvamisa ukumelana ashiselwe ipayipi, eyenziwe hot-iphuma steel plate, ngokusebenzisa okuqhubekayo ukwakha, ukugoba, Welding, ukwelashwa ukushisa, sizing, ukuqondisa, ukusika kanye nezinye izinqubo. Izici: Uma kuqhathaniswa ne-spiral seam engaphansi kwe-arc eshiselwe insimbi ...
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