Hiki i nā mea hana paʻa ke hana i nā paipu kukui pololei
ʻO ka manaʻo o ke kiʻekiʻe kiʻekiʻe o ka hoʻoheheʻe ʻana i ka brittleness o ka puʻupuʻu kukui pololei i manaʻo ʻia ʻo ia ka hopena o ka hoʻokaʻawale ʻana o nā mea haumia e like me ka phosphorus, tin, antimony a me arsenic ma ka palena o ka palaoa austenite kumu, ka hopena i ka embrittlement palena o ka palaoa. Hoʻokaʻawale ʻia nā mea hoʻohui e like me ka manganese, nickel a me ka chromium me nā mea haumia i luna ma ka palena o ka palaoa, e hāpai ana i ka hoʻonui ʻana i nā mea haumia a hoʻoikaika i ka embrittlement. ʻO ka mea ʻē aʻe, ʻoi aku ka ikaika o ka molybdenum me ka phosphorus a me nā mea haumia ʻē aʻe, hiki ke hoʻohua i ka pae o ka ua i loko o ke aniani a keʻakeʻa i ka hoʻokaʻawale ʻana i ka palena o ka phosphorus, hiki ke hōʻemi i ka brittleness o ka wela wela. He like ka hopena like me ka molybdenum. Hiki i ka Titanium ke hoʻoikaika maikaʻi i ka ua o ka phosphorus a me nā mea haumia ʻē aʻe i loko o ka aniani, i mea e hoʻonāwaliwali ai i ka palena o ka palaoa i hoʻokaʻawale ʻia o nā mea haumia a hoʻolohi i ka brittleness wela wela.
ʻO nā mea e hoʻemi ai i ka brittleness o ka wela wela o nā paipu kukui pololei penei: (1) ma hope o ka hoʻoheheʻe ʻana i ka wela kiʻekiʻe, hoʻohana ʻia ka ʻaila ʻaila a i ʻole ka wai hoʻoheheʻe wikiwiki e pale i ka hoʻokaʻawale ʻana o nā mea haumia ma ka palena o ka palaoa (2) Ke hoʻohana ʻia ka molybdenum. maʻiʻo i loko o ke kila piʻi i 0.7%, ka embrittlement tendency o kiʻekiʻe-mehana tempering ua hoemi loa. Ma waho aʻe o kēia palena, 20 # ʻo nā paipu kila pololei e hana i nā carbide kūikawā i waiwai i ka molybdenum, e emi ana ka ʻike molybdenum i loko o ka matrix, a piʻi ka embrittlement o nā paipu kukui pololei (3) E hoʻemi i ka 20 # i ka ʻike o nā mea haumia i ka paipu kila pololei (4 ) He mea paʻakikī ke pale aku i ka embrittlement o nā ʻāpana e hana ana i kahi embrittlement hoʻomehana wela kiʻekiʻe no ka manawa lōʻihi ma ka hoʻohui ʻana i ka molybdenum wale nō. Ma ka hōʻemi wale ʻana i ka 20 # impurity element content in precision steel pipe, hoʻomaikaʻi i ka maʻemaʻe o ka pololei o ka paipu ʻālohilohi, i hoʻohui ʻia e ka hui ʻana o ka alumini a me nā mea ʻene honua, hiki ke pale maikaʻi i ka embrittlement wela wela.
I kēia manawa, aia ma mua o 5100 mau mea kanu hana ma lalo o 1850 mau ʻoihana ma mua o 110 mau ʻāina, me ka ʻoi aku o 260 mau mea kanu ma lalo o 170 mau hui ma 44 mau ʻāina. I ka makahiki 2000, ʻo ka ʻai ʻana o ka paipu liʻiliʻi ma Kina he 4.18 miliona tons, me 3.821 miliona tons o ka lako hale, ʻo ia ka 91.4% o ka nui o ka noi home. ʻO 359000 tons ka lawe ʻia mai, ʻo ia ka 8.59% o ka nui o ka noi kūloko. I ka makahiki hoʻokahi, ʻo ka hoʻohana ʻana i nā paipu aila ma kahi o 910000 tons. ʻO ka lawe ʻana mai ma kahi o 252000 tons. ʻO nā paipu i lawe ʻia mai ma kahi o 70% o ka nui o ka hoʻohana ʻana i ka home, a ʻo nā paipu i lawe ʻia mai he 27.69% o ka nui o ka hoʻohana ʻana i ka home, a ʻo nā paipu aila ma kahi o 70% o ka nui o ka lawe ʻia ʻana mai o nā paipu seamless. ʻO nā paipu aila i lawe ʻia mai Iapana mai ka hapa nui o ka nui o nā mea i lawe ʻia mai. ʻO ka hui paipu kila ʻo Tianjin, ʻo Kina ka nui loa o ka ʻaila casing production base, i hana i 522000 tons o nā huahana paipu kila ma 2000, me 364100 tons o ka pahu aila. ʻOi aku ka hapalua o ka hana aila ʻāina i Casing. ʻO ia ka mea mua ma ka mākeke casing o Kina e pili ana i ka hoʻopuka a me ka nui o ke kūʻai aku.
Mai nā mākeke honua a me ka home, ua ʻoi aku ka nui o ka hana o nā paipu seamless (me nā paipu aila kūikawā) i ka koi. No laila, i ka wā e hiki mai ana, ʻo ka manaʻo nui e hāʻawi i ka pāʻani piha i ka hiki o nā ʻāpana e kū nei a me ka hoʻomohala ʻana i nā huahana e like me nā paipu aila, nā paipu paila kīʻaha kiʻekiʻe a me nā paipu cylinder gas me ka ikaika kiʻekiʻe, ke kūpaʻa ʻino kiʻekiʻe a me ke kūpaʻa corrosion kiʻekiʻe. ʻO ia hoʻi ka ʻike o ka hoʻonui ʻana i ka hoʻolālā huahana no ka mākeke kila o Kina. ʻO kēia hoʻi ke kī e hoʻonui ai i ka hoʻokūkū o nā huahana ma ka home a ma waho a hoʻonui i ka māhele mākeke. ʻO ia hoʻi, ʻo ka hoʻomaikaʻi ʻana i ka mākeke hoʻokūkū o nā ʻoihana paipu kila hale ka hana lōʻihi a me ke kī i ka holomua holomua o nā ʻoihana kūloko ma hope o ke komo ʻana o Kina i ka WTO.
