Kev tiv thaiv corrosion ntawm ASTM A606-2 weathering steelncaj qha los ntawm nws ua tib zoo tsim tshuaj muaj pes tsawg leeg, which promotes the formation of a dense, stable, and self‑protective surface patina that stops further atmospheric corrosion.
1. Copper (Cu): min 0.20%
Tooj yog tusqhov tseem ceeb tshaj plawsrau kev ua haujlwm huab cua. Nws accelerates tsim cov nplua, tiv thaiv oxide txheej, inhibits qhov nkag mus ntawm noo noo thiab corrosive ions, thiab tiv thaiv cov xeb txheej los ntawm xoob los yog flaking. Yog tias tsis muaj tooj liab txaus, cov hlau tsis tuaj yeem txhim kho huab cua tsis zoo.
2. Chromium (Cr): 0.40–0.65%
Chromiumntxiv dag zog thiab stabilizes patina. Nws txhim kho qhov adhesion thiab compactness ntawm oxide zaj duab xis, ua rau nws tiv taus nag, av noo, thiab cov pa phem me me. Nws kuj ua rau qeeb tus nqi corrosion hauv nroog thiab kev lag luam ib puag ncig.
3. Silicon (Si): 0.30-0.65%
Silicon pab deoxidation thaum steelmaking thiabrefines lub microstructure ntawm nto patina. Ib qho yooj yim, denser patina muab kev tiv thaiv zoo dua tiv thaiv cov pa oxygen thiab noo noo, txhim kho lub sijhawm ntev atmospheric corrosion kuj.
4. Nickel (Ni): mus txog 0.40%
Nickel txhim kho ob qho tib sitoughness thiab corrosion kuj. Nws pab cov patina nyob ruaj khov nyob rau hauv cov huab cua hloov pauv thiab txhim kho kev tiv thaiv me me corrosive industrial atmospheres.
5. Cov pa roj carbon tsawg (C): max 0.22%
Tsawg carbon ua kom ntseeg tauzoo weldability thiab formabilitytsis txo cov corrosion kuj. Cov pa roj carbon ntau dhau yuav ua rau tsis sib xws corrosion thiab txo qhov ruaj khov ntawm cov patina tiv thaiv.
6. Manganese (Mn): max 1.25%
Manganese muab lub zog thaum tswj cov ductility, thiab txhawb nqa cov qauv microstructure uas tso caitxawm patina tsimhla tag nrho saum npoo.
