Q1: Dab tsi ua rau Q460 welded yeeb nkab qhov "siab- zog" xaiv hauv Q-series, thiab nws lub zog qis kawg nkaus yog dab tsi?
A1:Q460 sawv cev rau qhov txwv siab tshaj ntawm lub zog hauv cov koob no, nrog kev lees paub qhov tsawg kawg nkaus tawm lub zog ntawm460 MPa rau. Nws ua tiav qhov no los ntawm kev sib xyaw ua ke ntawm cov ntsiab lus ntawm cov pa roj carbon zoo thiab microalloying nrog vanadium (V) thiab niobium (Nb), uas txhawb nqa cov nag lossis daus zoo. Nws yog tsim los rau cov qauv kev thauj khoom hnyav tshaj plaws.
Q2: Rau Q460 welded yeeb nkab nrog ib txoj kab uas hla ntawm 600mm thiab phab ntsa thickness ntawm 20mm, nws kwv yees li axial load yog dab tsi?
A2:Lub axial load-cov kabmob muaj peev xwm (P) tuaj yeem kwv yees siv cov qauv P=σ_y * A, qhov twg σ_y yog lub zog tawm los (460 MPa) thiab A yog hla- ntu ntu. Rau 600 hli txoj kab uas hla cov yeeb nkab nrog 20 hli phab ntsa thickness, tus ntoo khaub lig-sectional cheeb tsam A ≈ 36,442 mm². Yog li, P ≈ 460 MPa * 36,442 mm² ≈16,763 kN (16.76 MN). Qhov no yog ib qho kev thauj khoom siab heev, ua kom pom tias nws haum rau thawj qhov chaw thauj khoom -cov kab kabmob.
Q3: Hauv kev ua haujlwm ntawm ntug dej hiav txwv, vim li cas Q460 welded yeeb nkab yog cov khoom siv zoo tshaj plaws rau lub platform tsho ob txhais ceg?
A3:Offshore platforms ntsib qhov hnyav hnyav los ntawm cua, nthwv dej, thiab dej ntws. Q460 lub zog siab tso cai rau me me txoj kab uas hla, nyias nyias- cov kav dej, uas txo cov cab thiab nthwv dej ntawm cov qauv. Nws zoo heev toughness thiab corrosion kuj (thaum coated zoo) ua kom ntev -lub sij hawm kev cia siab nyob rau hauv hnyav marine ib puag ncig, txawm nyob rau hauv lub zoo dej tob.
Q4: Tus nqi li cas -kev ua tau zoo ntawm Q460 welded yeeb nkab piv rau kev siv ntau txheej ntawm Q345 lossis Q390 steel rau tib daim ntawv thov?
A4:Thaum Q460 muaj cov khoom siv ntau dua tus nqi ib tuj, nws feem ntau yog tus nqi ntau dua -zoo tag nrho. Los ntawm kev siv Q460, koj tuaj yeem txo tus ntoo khaub lig- ntu txog li 30% piv rau Q345. Qhov no ua rau kev txuag nyiaj tseem ceeb hauv cov khoom siv raw, kev thauj mus los, kev tsim kho hauv paus, thiab cov nqi erection. Tus nqi tag nrho ntawm lub neej yog feem ntau qis dua txawm tias tus nqi pib ntau dua.
Q5: Dab tsi yog cov kev cai tshwj xeeb rau tom qab-weld heat treatment (PWHT) ntawm Q460 welded kav, thiab nws muab cov txiaj ntsig dab tsi?
A5:PWHT rau Q460 feem ntau suav nrog atempering txheej txheem ntawm 550℃rau 650 degree. Cov kauj ruam tseem ceeb no txo qis cov kev ntxhov siab seem uas tau tsim thaum lub sij hawm vuam thiab softens qhov nyuaj, brittle martensite hauv HAZ. Qhov tshwm sim yog ib qho kev txhim kho tseem ceeb hauv toughness thiab qaug zog tiv thaiv, ua kom muaj kev ncaj ncees ntawm kev sib koom ua ke ntawm nws lub neej kev pab cuam.
