22. Cov Khoom Siv Khoom Siv thiab Kev Ua Haujlwm Zoo
Q1: Dab tsi yog cov khoom tseem ceeb ntawm Q355B hlau?
A1: Q355B cov khoom pov thawj ntau yam khoom siv tseem ceeb uas ua rau nws haum rau cov ntawv thov kev siv. Qhov tsawg kawg nkaus los lub zog yog 355 MPa, thaum lub tensile zog ntau dua li 470 {}} 630 mpa. Elongation ntawm kev ntsuas kev ntsuas ntau dua lossis sib npaug li 22%, qhia tau qhov ductility zoo. Charpy V-Motch cuam tshuam lub zog ntawm 20℃tau loj dua los yog sib npaug ntawm 34J, kev ua kom muaj kev lom zem. Cov khoom siv muaj kev tawv ntoo muaj ntau yam ntawm 120-180 HB, ntsuas tshuab hluav taws xob thiab hnav tsis kam. Cov tub ntxhais hluas cov modulus yog kwv yees li 210 GPA, zoo ib yam li lwm cov pob roj carbon. Cov khoom no nyob ruaj khov thoob plaws ib qho dav ntau ntau, txawm hais tias cuam tshuam kev nruj me me txo qis dua hauv qab -20 degree. Qhov sib xyaw ua ke ntawm lub zog thiab ductility tso cai rau q355b kom withstand ob qho tib si zoo li qub thiab kev siv hluav taws xob hauv kev tsim kho thiab cov kev siv cov Machinery.
Q2: Yuav ua li cas Q355b ua nyob rau hauv cyclic chaw thau khoom?
A2: Q355B qhia tau zoo ua kom qaug zog zoo thaum tsim nyog tsim thiab fabricated. Qhov kev ua siab ntev rau cov qauv polished yog kwv yees li 200 - 250 mpa ntawm 2 lab mus. Welded sib koom tes feem ntau yog qhia tau txo qis zog zog (80 {}} 12 mpa) vim muaj kev ntxhov siab ntawm Weld cov ntiv taw. Kev ua phem ua raws li cov qauv s ...- i}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} Leeking ua kom cov kev ntxhov siab hauv qab no lub neej qaug zog. Nto ua tiav cuam tshuam cuam tshuam rau kev ua tau zoo- tshuab} cov khoom siv o o {16} {dov. Kev kho mob tom qab weld zoo li sib tsoo lossis peent tuaj yeem txhim kho kev ua kom qaug zog lub neej los ntawm 20-30%. Daim ntawv thov tseem ceeb yuav tsum tau cov qauv kev nkees siv cov txheej txheem xws li kev ntxhov siab ntawm nominal, kub-kub ntxhov siab rau ib tus qauv tsim tsim.
Q3: Dab tsi yog cov khoom thermal ntawm q355B kav?
A3: Q355B kav muaj cov khoom plig thermal tseem ceeb rau kev tsim cov kev suav. Cov coeffic expansion yog 12 × 10⁻⁶ /℃ntawm 20 {{{{}} 100 degree, nce me ntsis thaum siab dua. Thermal kev tsim kev ntsuas kwv yees li 50 W / (MEX KN), tso cai rau kev hloov kho cua sov hauv tshav kub. Qhov kev kub muaj peev xwm tshwj xeeb yog 465 J / (KGNACH k) ntawm chav sov. Cov ntaub ntawv khaws lub zog txog li 300 degree, nrog rau lub zog txo qis mus txog 90% ntawm chav tsev kub muaj nuj nqis ntawm 200℃thiab 75% ntawm 300 degree. Saum toj 400 degree, nkag ua qhov kev txiav txim siab rau kev pabcuam ntev. Cov khoom siv no cuam tshuam kev txiav txim siab tsim kev txiav txim siab rau cov kav dej uas muaj cov kev hloov pauv kub lossis siv rau hauv cov ntawv thov cua sov.
Q4: Npaum li cas Q355b coj cwj pwm hauv tsawg ib puag ncig?
A4: Q355B tswj hwm kev ua kom muaj kev nyuaj rau -}}}}}} Lub zog muaj kev poob qis zuj zus li qhov ntsuas kub. Hauv qab no {{{{}} 20 degree, cov khoom hloov mus rau qhov ncaj ncees nrawm dua. The ductile-to-brittle transition temperature typically falls between -30℃to -50℃depending on processing history. Rau kev pab cuam qis tsawg, qib Q355D (kuaj ntawm -20 degree) lossis Q35Se (sim ntawm -40 degree) yog cov kev xaiv ntawm -40) yog cov kev xaiv ntawm -40) yog cov kev xaiv tau zoo. Thinner seem feem ntau ua tau zoo dua li cov hlau tuab ntawm cov kub qis vim muaj kev ntxhov siab ntau dua. Welded cov pob qij txha yuav tsum muaj kev txiav txim siab tshwj xeeb raws li lub chaw sov kub-cuam tshuam ntau dua qhov kub. Tsim nyog tsim qauv thiab cov ntaubrication tuaj yeem ua kom q355555 xoos siv nyob rau hauv cov huab cua txias txias, tab sis lwm cov ntaub ntawv yuav tsum tau txiav txim siab rau Arctic cov xwm txheej.
Q5: Dab tsi yog cov corrosion tsis kam ntawm Q355B?
A5: Q355B tau mob corrosion tsis kam ntawm cov roj carbon hlau. Kev tiv thaiv tsis muaj kev tiv thaiv, nws tsim cov txheej xeb hauv cov huab cua ntawm cov nqi ntawm 0.05 {8} mm / xyoo nyob ntawm ib puag ncig. Cov khoom siv qhia cov kev ua tau zoo dua li cov roj carbon hlau vim yog cov me me tooj ntxiv (0.15-0.40%) uas txhim kho cov atmospheric corrosion tsis kam. Txawm li cas los xij, nws tseem muaj kev cuam tshuam rau pitting hauv chloride ib puag ncig thiab cov corrosion dav hauv cov acidic tej yam kev mob. Kev tiv thaiv txheej txheem los yog kev tiv thaiv Cathodic feem ntau yuav tsum tau ua haujlwm ntev. Hauv nruab nrab PH taub dej, corrosion tus nqi feem ntau hauv qab 0.1 mm / xyoo. Tshwj xeeb huab cua qib nrog kev txhim kho corrosion tsis muaj rau qee cov ntawv thov. Kev tsim qauv tsim nyog yuav tsum tsis txhob muaj cov chaw ua haujlwm thiab qhov tsis zoo uas nyob hauv cheeb tsam corrosion hauv zej zog tuaj yeem nrawm.
