Tshuaj lom neeg muaj pes tsawg leeg ntawm API 5L X52
1. PSL1 (Qib Qib)
Cov pa roj carbon (c):
Seamless steel yeeb nkab: tsawg dua los yog sib npaug rau 0. 28%
Welded Steel Yeeb: Tsawg dua los yog sib npaug rau 0. 26%
Manganese (MN): Tsawg dua lossis sib npaug rau 1.4 {2}}}}}}}}}}}}}}}}}}}}}}}}}}}}.
Phosphorus (p): tsawg dua lossis sib npaug rau 0. 030%
Sulphur (s): tsawg dua los yog sib npaug rau 0. 030%
Lwm cov ntsiab lus:
Tooj liab (Cu), npib tsib), chromium (C): Txhua tsawg dua lossis sib npaug}. 50%
Molybdenum (mo): tsawg dua lossis sib npaug rau 0. 15%
Vanadium (v) + niobium (nb) + titanium (ti): tus lej ntawm tsawg dua lossis sib npaug {2}}. 15%
2. PSL2 (Qhov Kev Xav Tau Siab, xws li X52N / L360N)
Cov pa roj carbon (c): tsawg dua lossis sib npaug rau 0. 24%
Silicon (Si): tsawg dua lossis sib npaug rau 0. 45%
Sulphur (s): tsawg dua los yog sib npaug rau 0. 015% (stricter tshaj PSL1)
Lwm cov kev txwv kev txwv tsis muaj xwm yeem nrog PSL1, tab sis qee qhov kev kuaj ntsuas yog txoj kev ntsuas ntau dua (xws li qhov cuam tshuam kub tsawg dua).
3. Cov Lus Qhia Tshwj Xeeb
Cov pa roj carbon ntawm welded steel yeeb nkab yuav tsum tau nruj dua tswj (tsawg dua lossis sib npaug}. 26%) kom txo qis kev pheej hmoo ntawm weld cracking.
Micro-aloyoying: Niobium (NB), Vanadium (V) thiab muab cov lej tsawg dua li 15%)
