L485 pipeline steel yog siab -kev ua tau zoo, qis- alloy, siab- lub zog steel, feem ntau yog siv rau hauv kev tsim kho cov kav ntev - deb ntawm cov roj thiab cov nkev. Nws nta muaj zog, siab toughness, zoo weldability, thiab corrosion kuj.
L485 Kev piav qhia
L: Sawv rau "Linepipe".
485: Qhia qhov tsawg kawg nkaus tawm lub zog (SMYS) ntawm cov hlau, ntsuas hauv megapascals (MPa). Ntawd yog, qhov qis qis ntawm cov khoom siv zog ntawm cov yeeb nkab steel yog 485 MPa.
Kev sib txuas lus: L485 yog tag nrho sib npaug rau X70 hauv API 5L (X sawv cev rau lub zog, 70 sawv cev rau qhov tsawg kawg nkaus yield zog ntawm 70 klb / sq. inch, kwv yees li 483 MPa, feem ntau suav hais tias yog qib tib yam).
Cov qauv: Feem ntau ua raws li ISO 3183 "Cov kav hlau rau cov kav xa dej hauv kev lag luam roj thiab roj" lossis API Spec 5L "Linepipe Specification".
Tshuaj muaj pes tsawg leeg
Cov khoom tseem ceeb ntawm L485 pipeline steel muaj xws li carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), thiab lwm yam alloying ntsiab xws li chromium (Cr), npib tsib xee (Ni), molybdenum (Mo), tooj liab (Cu), niobium (Nb), vanadium (V), thiab titanium (V). Cov ntsiab lus tshwj xeeb yog raws li hauv qab no:
Carbon (C): Tsawg dua lossis sib npaug rau 0.18%
Silicon (Si): Tsawg dua lossis sib npaug li 0.40%
Manganese (Mn): Tsawg dua lossis sib npaug li 1.65%
Phosphorus (P): Tsawg dua lossis sib npaug rau 0.025%
Sulfur (S): Tsawg dua lossis sib npaug li 0.015% (qee qhov qauv yuav tsum Tsawg dua lossis sib npaug li 0.005% txhawm rau txhim kho corrosion kuj)
Chromium (Cr), Nickel (Ni), Molybdenum (Mo), tooj liab (Cu): tag nrho Less tshaj los yog sib npaug rau 0.30%
Niobium (Nb), Vanadium (V), Titanium (Ti): tag nrho Less tshaj los yog sib npaug rau 0.05%
Mechanical Properties
L485 pipeline steel muaj cov cuab yeej zoo heev, suav nrog:
Tawm Zog: 485 ~ 605MPa
Tensile Strength: Ntau dua lossis sib npaug rau 570MPa (qee cov ntaub ntawv qhia Ntau dua lossis sib npaug ntawm 485MPa, tab sis feem ntau nws yog siab dua kom ua tau raws li qhov yuav tsum tau muaj ntawm siab - cov kav dej siab)
Elongation tom qab Fracture: Ntau dua lossis sib npaug li 16%
Tsawg Kub Toughness: Impact Zog ntawm -20℃Ntau dua los yog sib npaug rau 150J (transverse), haum rau polar lossis dej hiav txwv ib puag ncig.
Cov cheeb tsam thov
L485 pipeline yeeb nkab yog dav siv hauv cov teb hauv qab no vim nws qhov kev ua tau zoo heev:
Roj thiab Roj Kev Thauj Khoom: Siv dav hauv - cov kav dej hiav txwv (piv txwv li, dej tob tshaj 2000m) thiab ntev - thaj av cov kav dej (piv txwv li, Sab Hnub Poob-Tebchaws Gas Pipeline project), ua tau raws li qhov yuav tsum tau muaj ntawm - siab thiab siab - lim dej.
Marine Engineering: Tsim nyog rau cov hlab ntsha siab thiab cov kav dej hauv cov dej hiav txwv corrosive ib puag ncig.
Lwm cov teb: Kuj tseem siv rau hauv kev tsim cov choj, siab - lub zog ntawm cov khoom siv hauv tsev thiab tshuab tsim khoom, thiab cov khoom siv thauj mus los hauv kev lag luam tshuaj.
Qhov zoo thiab qhov tsis zoo tsom xam
Qhov zoo:
Lub zog muaj zog: Yield zog Ntau dua los yog sib npaug rau 485MPa, tso cai rau txo cov yeeb nkab phab ntsa tuab thiab txo nqi tsim kho.
Siab Toughness: Zoo heev qis-kub toughness, haum rau polar lossis tob - hiav txwv ib puag ncig.
Zoo Weldability: Carbon sib npaug (CEⅡW) Tsawg dua los yog sib npaug rau 0.43, qis preheating yuav tsum, yooj yim rau ntawm - qhov chaw vuam.
Corrosion Resistance: Los ntawm kev tswj hwm cov ntsiab lus ntawm sulfur thiab ntxiv cov ntsiab lus xws li Cr thiab Ni, nws muaj qee yam tsis kam tiv thaiv hydrogen -induced cracking (HIC) thiab sulfide stress corrosion (SSC), ua tau raws li cov cai ntawm NACE MR0175 tus qauv.
Qhov tsis zoo:
Tus nqi siab dua: Piv rau cov pa roj carbon zoo tib yam, L485 pipeline yeeb nkab muaj cov txheej txheem tsim khoom thiab cov nqi ntau dua.
Kev xav tau siab rau cov txheej txheem vuam: Txawm hais tias weldability yog qhov zoo, kev tswj xyuas nruj ntawm cov txheej txheem vuam tseem tsim nyog los xyuas kom muaj kev sib koom ua ke.
