1. Q355NHB vs Ordinary Carbon Steel (Q235/Q355)
Corrosion kuj zoo dua ntawm Q355NHB: Pom tseeb thiab tseem ceeb(corrosion tus nqi yog li 1/3-1/2 ntawm cov pa roj carbon zoo tib yam).
Q355NHB muaj Cu, Cr, Ni, P thiab lwm yam corrosion -cov ntsiab lus resistant alloy, uas muaj peev xwm tsim ib tug tuab tiv thaiv patina rau saum npoo tom qab kev kho mob; Txawm nyob rau hauv tej yam ntuj tso lub xeev, nws cov xeb txheej yog kuj compact thiab yuav ua rau kom lub infiltration ntawm chloride ions thiab ya raws. Cov pa roj carbon zoo tib yam tsis muaj corrosion-cov hlau tsis muaj zog, thiab cov xoob xoob xoob xoob ua rau ntawm qhov chaw tsis tuaj yeem thaiv kev yaig ntawm cov tshuaj tsuag ntsev- nws yuav raug kev txom nyem los ntawm kev xeb sai thiab dav dav thiab thaj chaw pitting nyob rau hauv ntug dej hiav txwv kev lag luam ib puag ncig, thiab cov xeb txheej yog yooj yim rau tev tawm thiab ua kom cov substrate corrosion.
Kev ua haujlwm tiag tiag: Yog tias tsis muaj kev tiv thaiv kev tiv thaiv corrosion, cov pa roj carbon zoo tib yam yuav muaj qhov pom tseeb ntawm xeb thiab thickness txo nyob rau hauv 1-2 xyoo nyob rau hauv cov ntug dej hiav txwv kev lag luam, thiab xav tau ntau repainting (txhua 2-3 xyoos); Q355NHB nrog kev kho saum npoo yooj yim tuaj yeem tswj tau qhov chaw ruaj khov rau 5-8 xyoo, thiab cov qauv kev ntseeg tau zoo dua li cov pa roj carbon zoo tib yam.
Muaj feem cuam tshuam qhov sib txawv: Cov pa roj carbon zoo tib yam tsuas yog tsim nyog rau ib ntus qis- cov qauv thauj khoom nyob rau hauv ntug dej hiav txwv kev lag luam nrog hnyav los tiv thaiv- txheej txheej; Q355NHB tuaj yeem siv tau ntev -lub sijhawm thauj khoom-cov kabmob / cov qauv zoo nkauj nrog cov qauv kev kho deg thiab kev saib xyuas tsis tu ncua.
2. Q355NHB vs. General Low-Alloy Structural Steel (Q355B/Q420B)
Corrosion kuj zoo dua ntawm Q355NHB: Pom tseeb(corrosion tus nqi yog kwv yees li 1/2–2/3 ntawm qhov tsis tshua muaj- hlau alloy).
General low- alloy structural steel tsuas yog ntxiv Mn, Si thiab lwm yam zog- txhim kho cov ntsiab lus, tsis muaj corrosion tshwj xeeb- tiv thaiv alloy configuration, thiab nws cov corrosion kuj tsuas yog me ntsis zoo dua li cov pa roj carbon zoo tib yam (tseem ceeb tib yam corrosion mechanism); cov xeb txheej tsim nyob rau hauv cov ntug dej hiav txwv kev lag luam ib puag ncig yog tseem xoob, thiab nws kuj yog nquag ntsev tsuag -induced pitting corrosion. Q355NHB optimizes alloy piv rau lub hauv paus ntawm kev ua kom lub zog siab, thiab kev tiv thaiv patina tsim los ntawm kev sib koom ua ke ntawm Cu thiab Cr yog lub hauv paus ntawm nws txoj kev txhim kho corrosion, uas tuaj yeem txo qhov kev yaig ntawm chloride ions.
Kev ua haujlwm tiag tiag: General low- alloy steel xav tau los tiv thaiv- txheej txheej corrosion los siv rau hauv cov chaw lag luam hauv ntug dej hiav txwv, thiab txheej txheej yooj yim kom poob rau hauv kev sib xyaw ua ke ntawm ntsev tsuag thiab muaj kuab paug; Q355NHB tuaj yeem paub txog "kev tiv thaiv xeb nrog xeb" tom qab patina acceleration thiab sealing kev kho mob, tsis tu ncua txheej txheej, thiab lub sij hawm ntev - corrosion kuj yog ntau ruaj khov.
3. Q355NHB vs. High-Qib Huab Cua Huab Cua (SPA-H/ASTM A606-4)
Corrosion kuj tsis zoo ntawm Q355NHB: Pom tseeb(corrosion tus nqi yog kwv yees li 2-3 npaug ntawm siab -qib huab cua hlau nyob rau hauv ib puag ncig).
High-qib huab cua steels xws li SPA-H thiab ASTM A606-4 muaj cov ntsiab lus siab dua thiab kev ua kom zoo dua ntawm corrosion-cov ntsiab lus resistant alloy (Cu Ntau dua los yog sib npaug rau 0.20%, Cr Ntau dua lossis sib npaug li 1.00%, Ni Greater dua lossis sib npaug rau 0.50 daim ntawv tiv thaiv thiab patina ntau dua), nplaum-nws patina tuaj yeem tiv thaiv kev nkag mus ntawm qhov nruab nrab-cov tshuaj chloride ions txawm tias nyob hauv lub xeev ntuj, thiab muaj kev tiv thaiv zoo dua rau kev lag luam muaj kuab paug yaig. Q355NHB muaj cov ntsiab lus qis dua ntawm corrosion{15}}cov ntsiab lus resistant alloy (Cu Tsawg dua lossis sib npaug rau 0.50%, Cr Tsawg dua lossis sib npaug li 0.65%, Ni Tsawg dua lossis sib npaug li 0.50%), thiab patina compactness yog deb qis dua siab -qib huab cua hlau; tsis muaj kev tiv thaiv nruj, nws patina yog ib qho yooj yim rau kev puas tsuaj los ntawm high-concentration ntsev tsuag, ua rau kom ceev corrosion.
Kev ua haujlwm tiag tiag: High-qib huab cua hlau tuaj yeem siv rau hauv thaj chaw me me ntug dej hiav txwv (tsawg dua lossis sib npaug li 3km ntawm hiav txwv) nrog tsuas yog kev kho sandblasting yooj yim; Q355NHB xav tau ntau- kauj ruam kho deg (acceleration + sealing + reinforcement) siv nyob rau hauv ib puag ncig ib puag ncig, thiab kev tu lub voj voog luv dua (2-3 xyoos vs. 5-8 xyoo siab-qib huab cua hlau).
Muaj feem cuam tshuam qhov sib txawv: High-qib huab cua hlau yog tsim rau nruab nrab- ntsev tsuag cov ntug dej hiav txwv kev lag luam (1-3km ntawm hiav txwv) tsis hnyav los tiv thaiv-corrosion; Q355NHB tsuas yog haum rau qis- ntsev tsuag cov ntug dej hiav txwv kev lag luam (Ntau dua lossis sib npaug li 3km ntawm hiav txwv) nrog kev tiv thaiv tus qauv, thiab tsis pom zoo rau nruab nrab -cov tshuaj tsuag ntsev tsis muaj kev tiv thaiv zoo dua.
4. Q355NHB vs Stainless hlau (304/316L)
Corrosion kuj tsis zoo ntawm Q355NHB: Tseem ceeb heev(corrosion tus nqi yog 5-10 npaug ntau dua li cov hlau tsis muaj steel, thiab qhov sib txawv yog qhov loj hauv qhov chaw hnyav).
Stainless steel relies on high content of Cr (18–20% for 304, 16–18% for 316L) and Ni (8–10% for 304, 10–14% for 316L) to form a dense and stable chromium oxide passive film on the surface, which is insoluble in chloride ions and industrial acid mist, and can realizetsis muaj xeb nyob rau hauv natural statenyob rau hauv ntug dej hiav txwv muaj ib puag ncig; 316L kuj ntxiv Mo (2-3%), uas ntxiv dag zog rau pitting corrosion tshwm sim los ntawm chloride ions. Q355NHB tsis muaj kev tiv thaiv zaj duab xis passive, thiab patina tsuas tuaj yeem ua kom qeeb corrosion ntau dua li thaiv nws tag nrho -txawm tias muaj qhov zoo tshaj plaws kev kho mob saum npoo av, nws tseem ua rau muaj kev cuam tshuam hauv cheeb tsam hauv siab - ntsev tsuag / hnyav hnyav ntawm ntug dej hiav txwv kev lag luam, thiab cov yeeb yaj kiab tsis zoo ntawm stainless hlau tseem tuaj yeem ua tiav kev tiv thaiv hauv ib puag ncig zoo li no.
Kev ua haujlwm tiag tiag: 304 stainless hlau tuaj yeem siv rau hauv me me / nruab nrab ntsev tsuag cov ntug dej hiav txwv kev lag luam rau lub sijhawm ntev yam tsis muaj kev kho deg; 316L tuaj yeem siv ncaj qha rau hauv cov tshuaj ntsev ntsev loj ntawm ntug dej hiav txwv kev lag luam (tsawg dua lossis sib npaug li 1km ntawm hiav txwv) thiab thaj chaw muaj kuab paug hnyav, nrog rau kev pab cuam lub neej ntau dua 30 xyoo. Q355NHB tsuas yog siv tau rau hauv qis -cov tshuaj tsuag ntsev ntawm ntug dej hiav txwv muaj kev tiv thaiv nruj, thiab kev pabcuam lub neej yog 15-20 xyoo nrog kev saib xyuas tsis tu ncua; nws yuav ntsib teeb meem corrosion loj nyob rau hauv ib puag ncig hnyav txawm tias muaj kev tiv thaiv.
Muaj feem cuam tshuam qhov sib txawv: Stainless hlau yog thawj qhov kev xaiv rau cov ntug dej hiav txwv kev lag luam nrog cov ntsev ntsev ntau ntau, hnyav kev lag luam muaj kuab paug los yog siab zoo nkauj (tsis muaj xeb); Q355NHB yog tus nqi - kev xaiv zoo rau qis - ntsev tsuag cov ntug dej hiav txwv kev lag luam nrog cov kev xav tau kev tiv thaiv corrosion thiab siv nyiaj tsawg.
