API 5Lyog tus qauv rau cov yeeb nkab hlau siv los thauj roj, roj av, thiab dej. Tus qauv no suav nrog ntau qib sib txawv ntawm cov hlau, uas X42 thiab X52 yog ob qib sib xws. Qhov sib txawv tseem ceeb ntawm X42 thiab X52 yog lawv cov khoom siv kho tshuab, tshwj xeeb tshaj yog lub zog tso zis thiab lub zog tensile.

X42Lub zog tsawg kawg nkaus ntawm X42 steel yeeb nkab yog 42,000 psi (290 MPa), thiab nws lub zog tensile yog txij li 60,000-75,000 psi (415-520 MPa). X42 qib steel yeeb nkab feem ntau yog siv rau hauv cov kav dej nrog qhov nruab nrab siab thiab lub zog xav tau, tsim nyog rau kev thauj cov xov xwm xws li roj, roj av, thiab dej.

X52Lub zog tsawg kawg nkaus ntawm X52 steel yeeb nkab yog 52,000 psi (360 MPa), thiab lub zog tensile yog txij li 66,000-95,000 psi (455-655 MPa). Piv nrog X42, X52 qib steel yeeb nkab muaj lub zog siab dua thiab tsim nyog rau cov kav dej uas muaj qhov siab dua thiab lub zog xav tau.

Nyob rau hauv cov nqe lus ntawm tus me nyuam txoj kev xa khoom,API 5L tus qauvqhia txog cov xwm txheej xa khoom sib txawv rau cov kav hlau tsis muaj seamless thiab cov kav hlau welded:

Cov yeeb nkab hlau tsis muaj qhov sib xyaw (N xeev): N xeev yog hais txog lub xeev kho kom zoo. Cov yeeb nkab hlau tsis muaj qhov sib xyaw raug kho kom zoo ua ntej xa khoom kom homogenize cov qauv me me ntawm cov yeeb nkab hlau, yog li txhim kho nws cov khoom siv kho tshuab thiab kev tawv. Kev kho kom zoo tuaj yeem tshem tawm cov kev ntxhov siab seem thiab txhim kho qhov ruaj khov ntawm cov yeeb nkab hlau.

Cov yeeb nkab vuam (M xeev): M xeev hais txog kev kho cua sov ntawm cov yeeb nkab vuam tom qab tsim thiab vuam. Los ntawm kev kho cua sov, cov qauv me me ntawm cov yeeb nkab vuam tau zoo dua, kev ua haujlwm ntawm thaj chaw vuam tau zoo dua, thiab lub zog thiab kev ntseeg siab ntawm cov yeeb nkab vuam thaum siv tau ua kom ntseeg tau.

API 5L tus qauvqhia meej txog cov tshuaj lom neeg sib xyaw, cov khoom siv kho tshuab, cov txheej txheem tsim khoom, kev tshuaj xyuas thiab kev sim cov kav hlau kav dej. Kev siv tus qauv ua kom muaj kev nyab xeeb thiab kev ntseeg siab ntawm cov kav hlau kav dej thaum thauj roj, roj av thiab lwm yam kua dej. Kev xaiv cov qib tsim nyog ntawm cov kav hlau thiab cov xwm txheej xa khoom tuaj yeem ua tau raws li qhov xav tau tshwj xeeb ntawm cov haujlwm engineering sib txawv thiab xyuas kom meej tias kev ua haujlwm ruaj khov ntawm lub kaw lus kav dej.