Q345NH yog ame me-rau-moderate weathering steelnyob rau hauv GB / T 4171, tsim rauatmospheric corrosion kuj- tsis yog rau dej hiav txwv, muaj zog acid/alkali, los yog immersion mus ntev. Hauv qab no yog nws cov txheeb ze kev ua tau zoo vs. cov khoom siv sib xyaw.
1. vs Ordinary carbon steel (Q235, Q355 yam tsis muaj huab cua)
Corrosion tus nqi: Q345NH corrodestsuas yog 1/3 mus rau 1/6 sairaws li cov pa roj carbon monoxide dawb hauv cov chaw nyob deb nroog / nroog.
Cov cwj pwm xeb:
Carbon steel: xoob, hmoov xeb uas ua rau poob; nkag mus tob rau xyoo los ntawm xyoo.
Q345NH: forms a dense, self‑sealing patina; corrosion slows mus ze-nres tom qab 1-2 xyoos.
Xaus: Q345NH yog qhov zoo heevnyob rau hauv tej huab cua sab nraum zoov.
2. vs. Higher-grade weathering steels (Q355NH, Q460NH, S355J0WP, Corten-B)
Corrosion kuj qib: zoo sib xws, yuav luagtsis muaj ntsiab lus txawvnyob rau hauv cov xwm txheej atmospheric.
Txhua tus tsim tib yam kev tiv thaiv -FeOOH patina.
Qhov sib txawv me ntsis tshwm sim hauvhnyav kev lag luam / ntug dej hiav txwv ntsev-nplua ib puag ncig, qhov twg Q355NH / S355J0WP / Corten-B tuaj yeem ua tau zoo dua vim tias me ntsis Cr, Ni, lossis Cu.
Xausq345n: uaze li sib npaugrau feem ntau cov haujlwm sab nraum zoov; Qhov sib txawv tsuas yog lub zog, tsis yog corrosion.
3. vs . 09CuPCrNi-A (cov khoom siv high-phosphorus weathering steel)
Hauv huab cua huv nyob deb nroog: kev ua haujlwm corrosion yogzoo sib xws.
Nyob rau hauv cov av noo, acidic, los yog chloride-muaj ib puag ncig:
09CuPCrNi-A tso siab rau siab P, uas ua rau nws patina nkig thiab tsis ruaj khov.
Q345NH muaj ntau qhov sib npaug ntawm cov hlau nplaum (Cu-Cr-Ni-low P) →ntau ruaj ntev-lub sij hawm corrosion kuj.
Xausq345n: uantau txhim khu kev qha nyob rau hauv hnyav atmospheric tej yam kev mob.
4. Stainless hlau (304, 316L)
Atmospheric ib puag ncig: Stainless hlau tseem zoo dua, tab sis Q345NH yogzoo txausrau feem ntau siv sab nraum zoov ntawm tus nqi qis dua.
Dej hiav txwv / chloride / acid:
Q345NH: pluag; patina ua tsis tiav, xeb sai sai.
316L stainless: zoo heev; yuav luag tsis muaj corrosion.
Xaus: Stainless hlau yog qhov zoo tshaj plaws hauv kev tawm tsam hnyav; Q345NH yog kev lag luam rau huab cua ib txwm.
5. vs. Aluminium alloy & galvanized hlau
Aluminium: ib txwm corrosion-resistant nyob rau hauv huab cua, tab sis mos, kim, thiab tsis rau hnyav load-bearing lug.
Galvanized hlau: kev tiv thaiv zoo thaum ntxov, tab sis zinc txheej hnav tawm; Tom qab ntawd, xeb zoo li cov hlau zoo tib yam.
Q345 NH:outlass galvanized steel tshaj 10+ xyoo; raug nqi ntau dua li aluminium rau cov khoom siv.
Xaus: Q345NH muabzoo dua lub sij hawm ntev dua galvanized steelthiab lub zog zoo dua li aluminium.
6. vs. Painted carbon hlau
Painted steel cia siab rau tag nrho cov txheej; ib zaug khawb, xeb kis hauv qab.
Q345NH: kho tus kheej patina; nto khawb tsis ua rau kev txhim kho corrosion.
Xausq345n: uantau tu-dawb thiab kav ntevtshaj cov xim pleev xim.
