1. Dab tsi yog cov khoom tseem ceeb ntawm Astm A572 Qib 55 steel yeeb nkab?
ASTM A572 Qib 55 yog qhov siab- muaj zog tsawg {} {}}}}}}}}}}}} txoj kev kawm. Qhov "55" nyob rau hauv nws lub npe sawv cev rau tsawg kawg los lub zog ntawm 55 ksi (kwv yees li 380 MPa). Nws ua tiav cov nplej ua kom zoo thiab nag lossis daus ntau zuj zus los ntawm kev sib ntxiv ntawm microalloying ntsiab xws li Niobium (NB) thiab Vanadium (V). Piv nrog rau cov pa roj carbon hlau, nws muaj lub zog siab dua {{}- qhov hnyav {{} cov khoom siv.
2. Dab tsi yog cov yam ntxwv ntawm nws cov khoom siv mechanical thiab tshuaj lom neeg? Cov Khoom Siv Neeg Kho Tshuab:
Paib lub zog ntau dua los yog sib npaug rau 380 MPa (55 ksi), tensile lub zog ntau dua los yog sib luag rau 485 mpa
Elongation ntau dua los yog sib luag rau 17% (ntsuas cua ntev 50 hli), ua kom muaj qee yam ntawm cov khoom tawg yooj yim
Yeem cuam tshuam cov kev cuam tshuam nyuaj nruj (piv txwv li, charpy v {}} notch cuam tshuam lub zog loj dua los yog sib npaug rau 20 j at -40 degree)
Raug tshuaj lom neeg muaj pes tsawg leeg:
Tsawg cov pa roj teeb (C Tsawg dua lossis sib npaug rau 0.23%), Manganese cov ntsiab lus 1.35% Max
Qhov tseem ceeb Microalloying ntsiab: Niobium (0.00-0.05%) lossis Vanadium (0.01-0.15%)
Nruj me ntsis cov leeg sulfur thiab phosphorus (s tsawg dua los yog sib npaug rau 0.030%, p tsawg dua lossis sib npaug los ntawm 0.030%) txhawm rau txhim kho weldability
Qhov kev sib xyaw no ua kom muaj zog ua kom muaj zog thaum ntsuas cov txheej txheem thiab qis {- kub nruj.
3. Dab tsi yog cov chaw thov tseem ceeb? Qib 55 steel yeeb, vim nws lub zog siab thiab lub zog zoo heev, tau siv dav hauv cov chaw hauv qab no:
Choj engineering: tseem ceeb thauj khoom - Cov kab teeb cig thiab cov pob tshab nyob rau hauv ntev {}} spail txuas ntxiv
Cov Machinery hnyav: High- zaus} zaus thauj khoom txhawb thiab chaw nres nkoj CRANE BOOMs
Cov Khoom Siv Hluav Taws Xob: Cua Turbine Ntauwd Midsections, Roj Platform Tsho, thiab lwm yam kev siv uas xav tau cov huab cua tiv tsis tau
Cov Tsheb Tshwj Xeeb: Lub teeb tsim qauv xws li lub tsheb muaj tub rog chassis thiab tsheb thauj khoom hnyav
Tsawg - Cov qauv siv cov hlau rau hauv cov tsev txias thiab siab, cov khoom siv uas muaj kev tso nyiaj rau lng kev tso tsheb hlau luam, thiab lwm yam.
4. Kuv yuav xaiv tau li cas ntawm qib 50 thiab qib 60 piv rau lwm qib? Kev sib piv sib piv thiab cov lus pom zoo:
Qib 50 (345 mpa kom muaj zog): tus nqi qis me ntsis, haum rau cov pa hnyav {{luas log qauv.
Qib 55 (380 MPA): 15% lub zog muaj zog dua, haum rau kev txo qhov hnyav lossis siab dua {3.
Qib 60 (415 MPA): lub zog siab tshaj plaws tab sis qis me ntsis qis dua, xav tau txoj kev tswj vuam nruj.
Xaiv cov ntsiab cai:
Qib 55 yog qhov xav tau rau kev hloov kho cov phiaj xwm uas xav tau kev sib npaug ntawm lub zog thiab nqi.
Thaum tus qauv tsim kev ntxhov siab tau nce qib ntawm qib 50, xaiv qib 55 ncaj qha.
Rau cov cheeb tsam txias heev (<-30°C), it is recommended to verify the low-temperature impact data for Grade 55.
5. Kev txiav txim siab tseem ceeb rau kev ua thiab tsim kho qhov tseem ceeb vuam technologies:
Vuam cov khoom sib xyaw ua ke: E80xx series cov hluav taws xob lossis er80s- g x xaim pom zoo.
Preheating yuav tsum tau: Daim phiaj ntau dua los yog sib npaug rau 16mm tuab yuav tsum preheating rau 120-180℃(kho nyob ntawm cov av noo).
Kev Ntsuas Kub Tswj Kub: Tsawg dua lossis sib npaug rau 230 Qib yog pom zoo kom tiv thaiv cov nplej coarsening.
Txias ua hauj lwm thiab kev tiv thaiv xeb:
Dab tsi yog khoov radius yuav tsum muaj ntau dua los yog sib npaug rau 4 zaug ntawm cov kab yeeb nkab (stricter tshaj Qib 50).
Laser lossis dej nres txiav yog nyiam rau kev txiav kom tsis txhob embrittlement nyob rau hauv tshav kub}}}}} cuam tshuam cheeb tsam.
Tshwj xeeb corrosion tiv thaiv: kub - dip galvanizing yuav tsum tau tswj galvanizing kub (tsawg dua los yog sib npaug rau 540 degree) los tiv thaiv lub zog ploj.
