X65 yog cov kav dej hlau ua raws li API 5L cov qauv, feem ntau yog siv hauv cov kav dej rau kev thauj cov khoom siv hluav taws xob xws li roj thiab roj. Hauv nws lub npe:
"X" qhia cov raj xa dej;
"65" sawv cev rau qhov tsawg kawg nkaus tawm lub zog ntawm 65 ksi (kwv yees li 448 MPa), txawm hais tias qee cov qauv yuav qhia txog 460 MPa.
Cov qib steel no yuav tsum ua tau raws li PSL2 (Cov Khoom Specification Theem 2), hais txog lub zog siab, qis- kub toughness, thiab corrosion kuj.
Tshuaj muaj pes tsawg leeg
X65 yog ib qho qis-carbon, qis- alloy steel nrog cov hauv qab no muaj pes tsawg leeg (los ntawm qhov hnyav):
Cov pa roj carbon (C): Tsawg dua lossis sib npaug li 0.09% (tswj cov ciam teb carbide nag lossis daus, txhim kho weldability)
Manganese (Mn): 1.00 ~ 1.70% (txhim kho hardenability, nce zog)
Phosphorus (P), Sulfur (S): Tsawg dua lossis sib npaug li 0.02% (txo qis impurities, txhim kho toughness)
Niobium (Nb), Vanadium (V), titanium (Ti): Ntxiv rau hauv cov lej txhawm rau txhim kho cov nplej thiab ua kom muaj zog
Chromium (Cr), Nickel (Ni): Ntxiv rau qhov tsim nyog los txhim kho corrosion (tshwj xeeb tshaj yog tiv taus hydrogen sulfide corrosion)
Mechanical Properties
Yield Strength (ReL): Ntau dua lossis sib npaug rau 448 MPa (los yog 460 MPa raws li tus qauv)
Tensile zog (Rm): 535 ~ 760 MPa
Elongation (A): Ntau dua lossis sib npaug li 18% (gauge ntev 50mm)
Impact Toughness: Charpy cuam tshuam lub zog ntawm -20℃Ntau dua los yog sib npaug rau 40 J (ua kom muaj zog tiv thaiv kev tawg ntawm qhov kub thiab txias);
Hardness: Tsawg dua los yog sib npaug rau 250 HB (thaum tseem xav txog machinability)
Cov yam ntxwv tseem ceeb ntawm kev ua haujlwm
Lub zog muaj zog thiab lub teeb yuag: Lub zog muaj zog yog 40% siab dua li cov pa roj carbon zoo tib yam, tso cai rau cov phab ntsa nyias nyias thiab txo cov nqi khoom.
Kev tiv thaiv corrosion zoo heev: Los ntawm qis- tswj cov sulfur thiab phosphorus thiab ntxiv ntawm Cr thiab Ni, nws tiv taus hydrogen sulfide stress corrosion (SSC) thiab seawater corrosion, ua rau nws haum rau cov kav dej hauv qab dej.
Weldability zoo heev: Carbon sib npaug (Ceq) Tsawg dua lossis sib npaug li 0.42%, nws tuaj yeem ua tiav los ntawm submerged arc vuam, siab - zaus vuam, thiab lwm yam, yuav tsum tsis muaj kev kho cua sov tom qab vuam.
Kev Ruaj Ntseg Tsawg-Temperature Toughness: Los ntawm kev tswj dov thiab tswj cov cua txias (TMCP) txheej txheem los ua kom cov nplej zoo dua, nws muaj zog heev txawm tias ntawm -30℃.
