API 5Lyog tus qauv rau steel kab yeeb nkab siv los thauj cov roj, nkev, thiab dej. Tus qauv npog ntau qib sib txawv ntawm cov hlau, uas X42 thiab X52 yog ob qib sib txawv. Qhov sib txawv tseem ceeb ntawm X42 thiab X52 yog lawv cov khoom siv kho tshuab, tshwj xeeb tshaj yog tawm lub zog thiab lub zog tensile.

X42: Qhov tsawg kawg nkaus yield zog ntawm X42 steel yeeb nkab yog 42,000 psi (290 MPa), thiab nws lub zog tensile ranges ntawm 60,000-75,000 psi (415-520 MPa). X42 qib steel yeeb nkab feem ntau yog siv rau hauv cov kav dej nrog cov kev xav tau nruab nrab thiab lub zog, haum rau kev thauj khoom xws li roj, roj, thiab dej.

X52: Qhov tsawg kawg nkaus yield zog ntawm X52 steel yeeb nkab yog 52,000 psi (360 MPa), thiab lub zog tensile ranges ntawm 66,000-95,000 psi (455-655 MPa). Piv nrog rau X42, X52 qib steel yeeb nkab muaj lub zog ntau dua thiab tsim nyog rau cov kav dej uas muaj siab dua thiab muaj zog.

Hais txog kev xa khoom,API 5L tus qauvQhia txog cov xwm txheej sib txawv rau cov kav dej seamless thiab cov kav dej welded:

Seamless steel yeeb nkab (N xeev): N lub xeev yog hais txog lub xeev kev kho mob normalizing. Seamless steel kav yog normalized ua ntej xa mus rau homogenize microstructure ntawm cov yeeb nkab steel, yog li txhim kho nws cov khoom siv kho tshuab thiab toughness. Normalizing tuaj yeem tshem tawm cov kev ntxhov siab seem thiab txhim kho qhov ruaj khov ntawm cov yeeb nkab steel.

Welded yeeb nkab (M xeev): M xeev hais txog kev kho thermomechanical ntawm cov yeeb nkab welded tom qab tsim thiab vuam. Los ntawm kev kho cov thermomechanical, microstructure ntawm cov yeeb nkab welded yog optimized, qhov kev ua tau zoo ntawm qhov chaw vuam yog txhim kho, thiab lub zog thiab kev ntseeg siab ntawm cov yeeb nkab welded thaum siv yog guaranteed.

API 5L tus qauvqhia meej txog cov tshuaj lom neeg muaj pes tsawg leeg, cov khoom siv kho tshuab, kev tsim khoom, kev tshuaj xyuas thiab kev sim ntawm cov kav dej steel kav. Kev ua raws li tus qauv ua kom muaj kev nyab xeeb thiab kev ntseeg siab ntawm cov kav dej steel kav thaum thauj cov roj, roj thiab lwm yam dej. Kev xaiv cov qib tsim nyog ntawm cov kav dej steel thiab kev xa khoom tuaj yeem ua tau raws li cov kev xav tau tshwj xeeb ntawm cov haujlwm engineering sib txawv thiab ua kom muaj kev ruaj ntseg ntawm cov kav dej.