He aha ke ʻano o "Pipeline Steel"?

Ka hoʻohana ʻana i ke kila paipu

Ke kila paipuʻO nā ʻano huahana e komo pū me nā paipu kila humuhumu a me nā paipu kila i hoʻopaʻa ʻia, hiki ke puʻunaue ʻia i ʻekolu mau ʻāpana: alpine, nā wahi kiʻekiʻe-sulfur a me ke kau ʻana o ka moena kai. ʻO kēia mau pipelines me kahi hana hana ʻino he mau laina lōʻihi a ʻaʻole maʻalahi ka mālama ʻana, a he mau koi koʻikoʻi ko lākou.

ʻO nā pilikia he nui e kū nei i ke kila pipeline: aia ka hapa nui o nā kahua aila a me ke kinoea ma nā wahi polar, nā ʻāpana hau, nā wao nahele, a me nā wahi moana, a he ʻano paʻakikī nā kūlana kūlohelohe; a i ʻole i mea e hoʻomaikaʻi ai i ka pono o ka halihali, e hoʻonui mau ʻia ke anawaena o ka pipeline, a e hoʻonui mau ʻia ke kaomi lawe.

Nā Waiwai Kila Paipu

Mai ka loiloi piha ʻana o ke ʻano hoʻomohala o nā pipeline aila a me ke kinoea, nā kūlana kau ʻana o ka pipeline, nā ʻano hāʻule nui a me nā kumu hāʻule, pono ke kila pipeline i nā waiwai mechanical maikaʻi (paia mānoanoa, ikaika kiʻekiʻe, paʻakikī kiʻekiʻe, kū'ē i ke komo ʻana), a pono hoʻi ke anawaena nui, Pono hoʻi ke anawaena nui, hiki ke hoʻopili ʻia, kū'ē i ke anuanu a me ka haʻahaʻa, kū'ē i ka corrosion (CO2), kū'ē i ka wai kai a me HIC, hana SSCC, a pēlā aku.

① Ikaika kiʻekiʻe

ʻAʻole wale ka ikaika tensile kiʻekiʻe a me ka ikaika hua e pono ai ke kila pipeline, akā koi pū kekahi i ka lakio hua e noho ma ka pae o 0.85 ~ 0.93.

② Paʻakikī hopena kiʻekiʻe

hiki i ka paʻakikī hopena kiʻekiʻe ke hoʻokō i nā koi o ka pale ʻana i ka nahā.

③Haʻahaʻa ka mahana hoʻololi ductile-brittle

Pono nā wahi ʻino a me nā kūlana aniau i ke kila pipeline e loaʻa i kahi mahana hoʻololi ductile-brittle haʻahaʻa. Ua lilo ka ʻāpana shear o DWTT (Drop Weight Tear Test) i ka helu kuhikuhi mana nui e pale ai i ka hāʻule ʻana o nā pipelines. Pono ke kikoʻī laulā e ≥85% ka ʻāpana shear fracture o ka specimen ma ka mahana hana haʻahaʻa loa.

④Ke kūpaʻa maikaʻi loa i ka haki ʻana o ka hydrogen (HIC) a me ka haki ʻana o ka sulfide stress corrosion (SSCC)

⑤ Hana maikaʻi o ka hoʻoheheʻe ʻana

He mea nui loa ka maikaʻi o ka weldability o ke kila no ka hōʻoia ʻana i ka pono a me ka maikaʻi o ka welding o ka pipeline.