Kodi "Pipeline Steel" ndi chiyani?

Kugwiritsa ntchito chitsulo chapaipi

Chitsulo cha bombamafomu opangira mankhwala akuphatikizapo mipope yachitsulo yopanda msoko ndi mipope yachitsulo yowotcherera, yomwe ingagawidwe m'magulu atatu: mapiri a alpine, madera a sulfure ndi malo ozungulira nyanja. .

Mavuto ambiri omwe amakumana nawo ndi zitsulo zamapaipi akuphatikizapo: madera ambiri a mafuta ndi gasi ali m'madera a polar, madzi oundana, zipululu, ndi nyanja, ndipo zachilengedwe zimakhala zovuta kwambiri;kapena pofuna kupititsa patsogolo kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe ka kayendetsedwe kake, kukula kwa payipi kumakulitsidwa nthawi zonse, ndipo mphamvu yobweretsera ikuwonjezeka nthawi zonse.

Mtengo wa Pipeline Steel Properties

Kuchokera pakuwunika kokwanira kwa kakulidwe ka mapaipi amafuta ndi gasi, kuyika mapaipi, njira zazikulu zolephereka komanso zolephereka, zitsulo zamapaipi ziyenera kukhala ndi zida zamakina abwino (khoma lakuda, mphamvu yayikulu, kulimba kwambiri, kukana), komanso kuyenera kukhala lalikulu m'mimba mwake, Iyeneranso kukhala ndi awiri lalikulu, weldability, kuzizira ndi otsika kutentha kukana, dzimbiri kukana (CO2), kukana madzi a m'nyanja ndi HIC, SSCC ntchito, etc.

①Kulimba mtima

Chitsulo cha chitoliro sichimangofuna mphamvu zolimba kwambiri komanso mphamvu zokolola, komanso zimafuna kuti chiŵerengero cha zokolola chikhale mumtundu wa 0,85 ~ 0,93.

② Kukhazikika kwakukulu

kulimba kwamphamvu kumatha kukwaniritsa zofunikira zopewera kusweka.

③Kutentha kotsika kwa ductile-brittle transition

Madera ovuta komanso nyengo zimafunikira chitsulo chapaipi kuti chikhale ndi kutentha kocheperako kocheperako. Dera lometa ubweya la DWTT (Drop Weight Tear Test) lakhala chilozera chachikulu choletsa kulephera kwa mapaipi. malo ometa ubweya wa ng'ombeyo akhale ≥85% pa kutentha kochepa kwambiri.

④Kukana kwabwino kwa hydrogen-induced cracking (HIC) ndi sulfide stress corrosion cracking (SSCC)

⑤ Kuchita bwino kwa kuwotcherera

Weldability wabwino wa zitsulo n'kofunika kwambiri kuonetsetsa umphumphu ndi kuwotcherera khalidwe payipi.