Rectangular paipu mea he 'ano o ka huinaha huinahalike malamalama thin-walled kila paipu, no hoi i ike ia me ke kila anuanu-hana profiles.Hana ʻia ʻo Q235 i ʻōwili wela a i ʻole i ʻōwili ʻia a i ʻole coil e like me ke kumu metala, i hana ʻia e ke kuʻi anu a laila welded e ke alapine kiʻekiʻe.ʻO ka nui o ke kihi a me ka pololei o ka ʻaoʻao o ka paipu huinahā ʻōwili wela me ka hiki ʻana o ka paia mānoanoa a ʻoi aku paha ma mua o ke kiʻekiʻe o ke kūʻē ʻana i ka wiliwili ʻana i ka paipu huinahā i hana ʻia koe wale no ka mānoanoa o ka pā.