Feem ntau hais lus, pipeline steel yog hais txog coils (steel strips) thiab steel daim hlau siv los tsim cov kav dej ntau zaus welded, kauv submerged arc welded kav, thiab ncaj seam submerged arc welded kav.

Nrog rau kev nce hauv kev thauj mus los ntawm cov raj xa dej siab thiab cov yeeb nkab txoj kab uas hla, cov yeeb nkab steel muaj zog (X56, X60, X65, X70, thiab lwm yam) tau tsim los raws li cov hlau tsis tshua muaj zog hlau txij li xyoo 1960. Rolling tshuab. Los ntawm kev ntxiv cov ntsiab lus (tag nrho cov nyiaj tsis ntau tshaj 0.2%) xws li niobium (Nb), vanadium (V), titanium (Ti), thiab lwm yam alloying ntsiab rau hauv cov hlau, thiab los ntawm kev tswj cov txheej txheem dov, cov khoom siv dav dav. cov khoom ntawm cov hlau tau zoo heev. High-strength pipeline steel yog cov khoom siv high-tech, cov khoom muaj nqis ntxiv, thiab nws cov khoom siv yuav luag txhua qhov kev ua tiav tshiab hauv cov txheej txheem thev naus laus zis hauv metallurgical teb. Nws tuaj yeem pom tau tias cov ntaub ntawv siv nyob rau hauv cov kav xa hluav taws xob ntev ntev sawv cev rau theem ntawm lub teb chaws kev lag luam metallurgical rau qee yam.

Cov kav xa hluav taws xob ntev-ntev muaj teeb meem xws li kev ua haujlwm hnyav, qhov chaw geological nyuaj, cov kab ntev, kev saib xyuas nyuaj, thiab ua rau tawg thiab tsis ua haujlwm. Yog li ntawd, cov yeeb nkab steel yuav tsum muaj cov khoom zoo xws li lub zog siab, siab toughness, weldability, tsis kam mus rau qhov txias txias thiab qis kub, thiab tawg tsis kam.

Xaiv cov yeeb nkab steel hlau los yog ua kom cov phab ntsa tuab ntawm cov kav dej steel yeeb nkab tuaj yeem ua rau cov kav dej xa hluav taws xob tuaj yeem tiv taus siab dua, yog li ua kom muaj peev xwm kis tau tus mob. Txawm hais tias tus nqi ntawm micro-alloy high-strength steel rau steel kav nrog tib txoj kab uas hla yog li 5% mus rau 10% siab dua li cov hlau zoo tib yam, qhov hnyav ntawm cov yeeb nkab steel yuav raug txo los ntawm 1/3, kev tsim thiab vuam txheej txheem. yooj yim dua, thiab cov nqi tsheb thauj mus los thiab kev tso tawm kuj qis dua. Kev xyaum tau ua pov thawj tias tus nqi ntawm kev siv cov kav dej muaj zog siab tsuas yog kwv yees li 1/2 ntawm tus nqi ntawm cov kav hlau zoo tib yam nrog tib lub siab thiab txoj kab uas hla, thiab cov yeeb nkab phab ntsa yog thinned thiab muaj peev xwm ntawm kev tawg ntawm cov yeeb nkab. kuj txo. Yog li ntawd, nws yog feem ntau xaiv los ua kom lub zog ntawm cov yeeb nkab steel kom nce lub peev xwm ntawm cov kav dej, tsis yog ua kom cov phab ntsa tuab ntawm cov yeeb nkab steel.

Lub zog ntsuas ntawm pipeline steel feem ntau suav nrog lub zog tensile thiab lub zog tawm los. Cov yeeb nkab steel nrog lub zog muaj zog ntau dua tuaj yeem txo cov hlau siv hauv cov kav dej, tab sis siab dhau lawm, lub zog tawm los yuav txo qhov tawv ntawm cov yeeb nkab steel, ua rau cov yeeb nkab steel tawg, tawg, thiab lwm yam, thiab ua rau muaj kev nyab xeeb. Thaum xav tau lub zog siab, qhov sib piv ntawm lub zog tawm los rau lub zog tensile (yield-strength ratio) ntawm cov kav dej steel yuav tsum tau txiav txim siab. Ib qho piv txwv zoo-rau-lub zog tuaj yeem ua kom ntseeg tau tias cov yeeb nkab steel muaj lub zog txaus thiab muaj zog txaus, yog li txhim kho kev nyab xeeb ntawm cov kav dej.

Thaum ib lub raj xa hluav taws xob siab siab tawg thiab ua tsis tiav, cov pa roj compressed yuav nthuav dav thiab tso tawm ntau lub zog, ua rau muaj kev cuam tshuam loj xws li tawg thiab hluav taws. Txhawm rau txo qhov tshwm sim ntawm cov xwm txheej zoo li no, kev tsim cov kav dej yuav tsum ua tib zoo xav txog cov phiaj xwm kev puas tsuaj los ntawm ob yam hauv qab no: Ua ntej, cov yeeb nkab steel yuav tsum ua haujlwm ib txwm nyob rau hauv lub xeev tawv, uas yog, qhov kub thiab txias ntawm cov yeeb nkab yuav tsum yog. qis dua qhov kev pabcuam ambient kub ntawm cov raj xa dej kom ntseeg tau tias Tsis muaj kev sib tsoo tawg tshwm sim hauv cov kav hlau. Qhov thib ob, tom qab cov pob txha tawg tau tshwm sim, qhov tawg yuav tsum tau nres tsis pub dhau 1 mus rau 2 cov yeeb nkab ntev kom tsis txhob poob ntau dua los ntawm kev tawg mus ntev. Cov kav dej ntev ntev siv cov txheej txheem girth vuam los txuas cov kav hlau ib los ntawm ib qho. Qhov kev tsim kho hnyav hauv thaj chaw muaj kev cuam tshuam ntau dua rau qhov zoo ntawm girth welding, yooj yim ua rau tawg ntawm lub vuam, txo qhov tawv ntawm qhov vuam thiab qhov chaw kub-tshuaj, thiab ua rau muaj kev cuam tshuam ntawm cov kav dej. Yog li ntawd, cov yeeb nkab steel nws tus kheej muaj qhov zoo tshaj plaws weldability, uas yog ib qho tseem ceeb los xyuas kom meej qhov vuam zoo thiab tag nrho kev nyab xeeb ntawm cov kav dej.

Nyob rau hauv xyoo tas los no, nrog rau kev txhim kho thiab kev tsim cov roj av txuas ntxiv mus rau cov suab puam, thaj chaw roob, thaj tsam polar, thiab dej hiav txwv, cov kav dej nyob deb feem ntau yuav tsum dhau los ntawm cov cheeb tsam uas muaj kev nyuaj geological thiab climatic tej yam kev mob xws li permafrost zones, landslide zones, thiab thaj av qeeg. Txhawm rau tiv thaiv cov yeeb nkab steel los ntawm deforming vim av tawg thiab txav mus los thaum lub sijhawm ua haujlwm, cov kav dej xa hluav taws xob nyob hauv thaj chaw uas muaj av qeeg thiab kev puas tsuaj ntawm geological yuav tsum siv strain-based design-resistant pipeline steel kav uas tiv taus loj deformation. Cov kav dej uas tsis yog faus rau hauv qhov chaw hla mus, cov av khov, qhov chaw siab siab, lossis qhov chaw siab-latitude low-temperature yog raug rau qhov ntsuas kub txias txhua xyoo. Cov yeeb nkab steel yeeb nkab uas muaj qhov kub thiab txias tsis zoo yuav tsum raug xaiv; faus cov kav dej uas muaj corroded los ntawm cov dej hauv av thiab cov av muaj zog heev Rau cov kav xa dej, kev kho tiv thaiv corrosion sab hauv thiab sab nraum cov kav dej yuav tsum muaj zog.