Line Pipes Steels
Melemo: Matla a phahameng, boima ba 'mele le bokhoni ba ho boloka thepa
Tšebeliso e tloaelehileng: liphaephe tse kholo tsa bophara bakeng sa ho tsamaisa oli le khase
Phello ea molybdenum: e thibela ho thehoa ha perlite ka mor'a ho roala ha ho qetela, ho khothalletsa motsoako o motle oa matla le ho tšoarella ha mocheso o tlaase.
Ka lilemo tse fetang mashome a mahlano, mokhoa o atlehang ka ho fetisisa oa ho tsamaisa khase ea tlhaho le oli e tala libakeng tse telele ke ka liphaephe tse entsoeng ka tšepe ea bophara bo boholo. Liphaephe tsena tse kholo li na le bophara ba 20" ho isa ho 56" (51 cm ho isa ho 142 cm), empa hangata li fapana ho tloha ho 24" ho isa ho 48" (61 cm ho isa ho 122 cm).
Ha tlhoko ea matla a lefats'e e ntse e eketseha le libaka tse ncha tsa khase li sibolloa libakeng tse ntseng li thatafala le tse hole, tlhokahalo ea matla a lipalangoang le ho eketseha ha polokeho ea liphaephe ho tsamaisa litlhaloso le litšenyehelo tsa ho qetela. Meruo e ntseng e hola ka potlako joalo ka China, Brazil le India e ekelitse tlhoko ea lipeipi le ho feta.
Tlhokahalo ea liphaephe tse bophara bo boholo e fetisitse phepelo e fumanehang mecheng ea khale ea tlhahiso e sebelisang lipoleiti tse boima ka liphaephe tsa UOE (U-forming O-forming E-expansion), e leng se lebisang ho putlama nakong ea ts'ebetso. Ka hona, bohlokoa ba li-spiral tubes tse nang le bophara bo boholo le tse kholo tse hlahisoang ho tloha marapeng a chesang li eketsehile haholo.
Tšebeliso ea matla a phahameng a tšepe e tlaase ea alloy (HSLA) e thehiloe lilemong tsa bo-1970 ka ho kenngoa ha mokhoa oa ho roala ha thermomechanical, o neng o kopanya micro-alloying le niobium (Nb), vanadium (V). le / kapa titanium (Ti), e lumellang ts'ebetso e phahameng ea matla. tšepe e matla e phahameng e ka hlahisoa ntle le tlhokahalo ea mekhoa e theko e boima e eketsehileng ea phekolo ea mocheso. Ka tloaelo, litšepe tsena tsa pele tsa HSLA li ne li thehiloe holim'a li-microstructures tsa pearlite-ferrite ho hlahisa litšepe tsa tubula ho fihla ho X65 (matla a fokolang a 65 ksi).
Ha nako e ntse e ea, tlhokahalo ea liphaephe tse matla a holimo e ile ea lebisa lipatlisisong tse pharaletseng lilemong tsa bo-1970 le mathoasong a lilemo tsa bo-1980 ho hlahisa matla a X70 kapa ho feta a sebelisa meralo ea tšepe e tlaase ea carbon, eo bongata ba eona e sebelisang khopolo ea molybdenum-niobium alloy. Leha ho le joalo, ka ho hlahisoa ha theknoloji e ncha ea ts'ebetso joalo ka pholiso e potlakileng, ho ile ha khonahala ho nts'etsapele matla a holimo ka meralo e menyenyane ea alloy.
Leha ho le joalo, neng kapa neng ha litsila li sa khone ho sebelisa litekanyetso tse hlokahalang tsa ho pholisa tafoleng ea ho tsoa, ​​​​kapa li se na lisebelisoa tsa ho pholisa tse potlakileng, tharollo e le 'ngoe feela e sebetsang ke ho sebelisa litlatsetso tse khethiloeng tsa likarolo tsa alloying ho nts'etsapele thepa e lakatsehang ea tšepe. . Ha X70 e se e le sehlohlolong sa merero ea sejoale-joale ea lipeipi le botumo bo ntseng bo eketseha ba lipeipi tsa spiral line, tlhokahalo ea lipoleiti tse boima tse theko e boima le li-coil tse kolobisitsoeng ka mocheso tse hlahisoang ka bobeli litsing tsa Steckel le tse tloaelehileng tsa hot-strip li eketsehile haholo nakong e fetileng. lilemo.
Haufinyane tjena, merero ea pele e meholo e sebelisang thepa ea X80-grade bakeng sa pipe e telele ea bophara bo boholo e ile ea etsoa Chaena. Bongata ba litsi tse fanang ka merero ena li sebelisa likhopolo tsa alloying tse kenyelletsang litlatsetso tsa molybdenum tse thehiloeng ho nts'etsopele ea metallurgic e entsoeng lilemong tsa bo-1970. Meetso ea alloy e thehiloeng ho molybdenum le eona e bonts'itse bohlokoa ba eona bakeng sa li-tubing tsa bophara bo bohareng. Matla a ho khanna mona ke ho kenya liphaephe tse sebetsang hantle le ts'epo e phahameng ea ts'ebetso.
Ho tloha khoebong, khatello ea ts'ebetso ea liphaephe tsa khase e eketsehile ho tloha ho 10 ho isa ho 120 bar. Ka nts'etsopele ea mofuta oa X120, khatello ea ts'ebetso e ka eketsoa ho isa ho 150 bar. Likhatello tse ntseng li eketseha li hloka tšebeliso ea liphaephe tsa tšepe tse nang le marako a teteaneng le / kapa matla a phahameng. Kaha litšenyehelo tsohle tsa thepa li ka ikarabella ho feta 30% ea litšenyehelo tsohle tsa lipeipi bakeng sa morero oa lebōpong la leoatle, ho fokotsa palo ea tšepe e sebelisoang ka matla a phahameng ho ka fella ka ho boloka chelete e ngata.