ʻOi aku ka nui o ke anawaena o waho o ka paipu wela ʻole ma mua o 32mm, a ʻo ka mānoanoa o ka pā he 2.5-200mm. ʻO ke anawaena o waho o ka paipu kila liʻiliʻi i ʻōwili ʻia e hiki ke hiki i 6mm, a hiki i ka mānoanoa o ka paia ke hiki i 0.25mm. Hiki ke hiki i ka 5mm ke anawaena o waho o ka paipu paia lahilahi a emi iho ka manoanoa o ka paia ma mua o 0.25mm.

Hoʻohana maʻamau ʻia ka paipu kila maʻemaʻe ʻole i hana ʻia me 10, 20, 30, 35, 45 a me nā mea kiʻekiʻe kiʻekiʻe carbon i hoʻopaʻa ʻia i ke kila 16Mn, 5MnV a me nā mea haʻahaʻa haʻahaʻa structural steel a i ʻole 40Cr, 30CrMnSi, 45Mn2, 40MnB a me nā mea hana ʻē aʻe i hoʻopaʻa ʻia i ke kila 2am ʻole. Hoʻohana nui ʻia no ka pipeline wai.45, 40Cr a me nā mea hao kalapona ʻē aʻe i hana ʻia me ka paipu ʻole e hana i nā ʻāpana mechanical, e like me nā kaʻa, nā tractors stressed parts.The general use of seamless steel pipe to ensure the strength and flattening test.Hot rolled steel pipes are delivered in hot rolled or heat treated condition.Cold rolled delivery is heat - treated.