Puas yog cov tshuaj lom neeg muaj pes tsawg leeg ntawm Q345 hlau cuam tshuam nws kev ua haujlwm?
Cov tshuaj lom neeg muaj kuab lom ntawm Q345 steel muaj qhov ncaj qha thiab kev ua haujlwm tseem ceeb (suav nrog vuam, ua haujlwm txias, txiav, thiab lwm yam). Cov ntsiab lus ntawm cov ntsiab lus sib txawv pauv hloov cov txheej txheem hauv sab hauv (xws li cov khoom siv ua kom muaj zog, thiab cov khoom siv tshuab ua kom zoo dua qub (xws li tawg thiab deformation). Cov tshuaj txuas ntxiv hauv qab no Qhov kev cuam tshuam rau kev nkag raws cov ntsiab lus tseem ceeb ntawm Q345 los ntawm kev ua cov xwm txheej:
1. Kev cuam tshuam ntawm Vuam Kev Kawm (ib qho ntawm cov kev ua tseem ceeb tshaj plaws rau Q345)
Tus yuam sij rau kev ua tau zoo vuam yog kom tsis txhob tawg (txias tawg / kub tawg) thaum vuam thiab xyuas kom meej ntawm welded sib koom tes. Cov ntsiab lus tseem ceeb yog C, MN, P, S, V / TI / NB.
Cov pa roj carbon (c): ib lub ntsiab "rhiab" rau Weldability
Cov pa roj carbon yog ib qho tseem ceeb uas txhim kho cov txheej txheem hlau, tab sis cov peev txheej ntau dua rau cov ntsiab lus weldability.
Thaum lub sij hawm vuam, carbon ua ke nrog hydrogen nyob rau hauv weld ntawm held ntawm hydrogen {{0} {} backing cracking "(txias tawg). Nws tseem ua rau muaj kev nyuaj ntawm Weld thiab kub- hajection cheeb tsam (Haz), uas ua rau brittleness cuam tshuam (ua rau tawg tom qab vuam.
Q345 txheem nruj me ntsis cov pa roj carbon kom tsawg dua lossis sib npaug rau 0.20% (tuab tsawg dua lossis sib npaug rau kev sib npaug lub zog thiab weldability. Yog tias cov pa roj carbon ntau tshaj 0.20%, kev pheej hmoo ntawm Weld tawg nce ntau, txawm tias muaj cov txheej txheem preheating thiab qeeb qeeb.
Manganese (MN): Ib "ob npaug {{{}}}}}} edged rab ntaj" rau Weldability.
Ib tus nqi me me ntawm MN (1.00-} 1.60%) tuaj yeem txhim kho weldability. MN Deagidizes (txo cov ntsiab lus pa oxygen hauv weld thiab txo qhov kev pheej hmoo ntawm kub tawg thiab txhim kho kev sib tsoo weld thiab txhim kho kev sib koom ua ke. Ntau tshaj plaws MN (ntau dua li 1.60%) yog qhov muaj teeb meem: nws nce cov nplej "overheat rhiab," ua kom sov-cuam tshuam nrog kev sib koom ua ke. Yog tias ua ke nrog kev siab c, qhov tawv hnyav yog compounded, ntxiv rau kev puas tsuaj loj.
Phosphorus (p) thiab Sulphur (s): Kev ncaj qha rau Weld tawg
Phosphorus (p): nws nyhav swm ntawm cov ciaj ciam weld nyob rau hauv weld cua sov "}} weld txias (tshwj xeeb}} kub vuam ib puag ncig). Yog li ntawd, siab -}} qib Q345 (xws li tswj hwm d / e sib npaug lossis 0.025%, 0.025%, 0.025%, 0.025%, 0.025%, (0.025% Sulphur (s): nws tsim tsawg {{10} melting {{}} Lub ntsej muag sulfides (xws li fes, melting point kwv yees li 1190 degree) nrog hlau. Thaum lub sij hawm vuam, cov sulfides hauv qhov siab- qhov kub ntawm weld (1300-1500℃" Q345 Qib C / D / E muaj tsawg dua lossis sib npaug rau 0.035%, ua rau lawv muaj ntau dua vuas A / B (tsawg dua lossis sib npaug rau 0.040%).
MicroalyLying ntsiab (V / TI / NB): Txhim kho Weld Sib Koom Tes Ua Haujlwm
Tsim nyog ntxiv v (tsawg dua los yog sib npaug ntawm kev ua ke ntawm cov qoob loo uas tsis muaj sib luag, thiab muaj kev sib npaug los yog sib npaug kev ntseeg tau.
Txawm li cas los xij, ntau ntxiv ntxiv (piv txwv li, v> 0.15%) nce kev tawv tawv ntawm lub haz, ua kom muaj kev nyuaj ntau ntxiv).