1. Cov khoom siv tseem ceeb rau huab cua tiv thaiv
Ob qho tib si steels muaj tooj liab (Cu), chromium (cr), thiab phosphorus (p), tab sisQ355Snh muaj ntau dua ntawm cov ntsiab lus, ua rau kom zoo dua corrosion tsis kam. Hauv qab no yog kev txheeb xyuas kev sib piv rawsGB / T 4171-2008:
| Lub ntsiab | Q295NH(Cov ntsiab lus ntau yam) | Q355NH(Cov ntsiab lus ntau yam) | Lub luag haujlwm hauv huab cua tiv thaiv |
|---|---|---|---|
| CU (Tooj) | 0.25–0.55% | 0.25–0.55% (zoo ib yam) | Cov foos insoluble cu - rich nplua nuj compounds (piv txwv li, teo, cufeo₂) uas ntsees ntawm txheej xeb. |
| CR (chromium) | 0.40–1.25% | 0.40–1.25% (zoo ib yam) | Txhim kho corrosion tsis kam los ntawm kev tsim crao₃ thiab spinel oxides (fecr₂o₄) uas thaiv chloride / so a nkag. |
| P (phosphorus) | 0.07–0.12% | 0.07–0.15% (siab dua) | Ua kom muaj Patina tsim los ntawm catalyzing qhov hloov mus rau ruaj khov . feeethite). |
| Ni (npib tsib) | Tsawg dua los yog sib npaug rau 0.65% | Tsawg dua los yog sib npaug rau 0.65% (zoo ib yam) | Txhim kho kev nruj thiab corrosion tsis kam nyob rau hauv ib puag ncig hnyav (piv txwv li thaj chaw ntug hiav txwv). |
| C (carbon) | Tsawg dua los yog sib npaug rau 0.15% | Tsawg dua los yog sib npaug rau 0.18% (me ntsis siab dua) | C C yuav txo qis weldability tab sis tau tsawg ncaj qha rau huab cua tiv thaiv. |
2. Qhov sib txawv tseem ceeb cuam tshuam kev ua tau zoo
A. phosphorus (p) cov ntsiab lus
Q355NH: Tso cai rau0.15% P(vs . 0.12% hauv Q295NH), uas nrawm nrawm nrawm nrawm nrawm, ua rau muaj tseeb.
Ua rau: Q355Nh Stabilizes Laster (1.5-2 xyoo vs . 2}} - - 3 xyoos rau Q295NH hauv qhov huab cua sov).
B. Lub zog thiab microstructure
Q355NHMuaj ntau dua cov txiaj ntsig lub zog (ntau dua lossis sib npaug zos rau 355 MPa vs. ntau dua lossis sib npaug los ntawm Microalloying (piv txwv li V, NB) thiab tswj dov.
Indirect Pab: Finer grain qauv hauv Q355NH txhim kho cov xeb txheej thiab cov kev sib dhos.
C. Corrosion Cov Ntaub Ntawv
Q295NH: Corrosion tus nqi ruaj khov ntawm0.05-0.08 mm / xyootom qab patina tsim.
Q355NH: Ua tiav tus nqi qis dua0.03-0.05 mm / xyooVim nws qhov kev ua tau zoo tag nrho.
3. Cov tswv yim cuam tshuam
| Xwm txheej | Q295nd | Q355Nhu Lub Cev |
|---|---|---|
| Inland / Huab Cua Huab Cua | Kev tiv thaiv nruab nrab; Haum rau tsis - tseem ceeb qauv (piv txwv li cov khoom siv ua liaj ua teb). | Superior kev ua haujlwm; Qhov zoo tshaj plaws rau choj, lub tsev facades. |
| Nqaum / Muaj Chaw Nyob | Tej zaum yuav tsum muaj kev tiv thaiv kev tiv thaiv lossis kev saib xyuas ntau zaus. | Resusions pitting zoo dua; Kev xaiv cov raj ntses rau cov kab txaws zones. |
| Tus nqi vs. kev ua haujlwm | Tus nqi qis dua tab sis luv dua lub neej nyob rau hauv kev ua kom muaj zog. | Ntau dua upfront tus nqi tab sis 30-50% ntev kev pab cuam lub neej. |
4. Kev Pom Zoo
Xaiv Q355NHRau cov phiaj xwm yuav tsum muaj ntev - lo durability tsis muaj txij nkawm tsis tau txij nkawm (piv txwv, iconic architecture, tseemceeb artrastructure).
Siv Q295NHRau cov ntawv thov tsawg uas tus nqi yog qhov tseem ceeb (piv txwv li, cov qauv sab hauv, cov qauv ib ntus).
