1. Kev faib tawm ntawm huab cua Resistance Qib
(1) Suav National Standard (GB/T 4171-2020)
Cov qib pibQ235NH, Q295NH, Q355NH, Q460NH, Q550NH
Tus lej ua ntej (piv txwv li, 235, 355) sawv cev rau qhov tsawg kawg nkaus yield zog (hauv MPa) ntawm steel phaj.
Lub ntsiab lus "NH" sawv cev rau "weathering (NaiHou) steel rau kev siv cov qauv".
Corrosion kuj grading: Txhua qib yog ntsuas ntxiv los ntawm atmospheric corrosion resistance Performance index (Icorr Ntau dua lossis sib npaug rau 6.5 rau kev ua haujlwm huab cua yooj yim; Icorr Ntau dua lossis sib npaug rau 8.0 rau kev tiv thaiv corrosion siab, haum rau qhov chaw hnyav).
(2) American Standard (ASTM)
ASTM A588 / A588M Kev Cai: High-lub zog huab cua steel (yield zog Ntau dua lossis sib npaug li 345 MPa), haum rau cov khoom siv hauv tsev (bridges, tsev thav duab) hauv cov chaw lag luam lossis cov ntug hiav txwv.
ASTM A242/A242M: Nruab nrab-lub zog huab cua steel (yield zog Ntau dua lossis sib npaug li 290 MPa), zoo tagnrho rau cov khoom siv kho kom zoo nkauj thiab lub teeb pom kev zoo (cov ntxaij vab tshaus, cov nroj tsuag) hauv thaj chaw nyob deb nroog / nroog.
ASTM A606 / A606M / ASTM A606 / ASTM A606 / ASTM A606 / ASTM A606 / ASTM A606 / ASTM A606 / ASTM A606 / A606M / ASTM A606 / ASTM A606 / ASTM A606 / ASTM A606 / A606M / ASTM A606 / ASTM A606 / A606M / ASTM A606 / A606M / ASTM A606 / A606M / ASTM A606 / A606M / ASTM A606 / A606M / ASTM A606 / ASTM A606 / A606M / ASTM A606) thiab ASTM: Tsawg- alloy weathering steel rau cov ntawv / coil cov khoom, tsom rau cov vaj tse cladding thiab cov khoom zoo nkauj.
(3) European Standard (EN 10025-5)
Qib: S235J0W, S275J0W, S355J0W, S355J2W (cov lus "W" qhia txog huab cua tsis kam).
Corrosion resistance classes: C1 (me me nyob deb nroog), C2 (urban/light industrial), C3 (heavy industrial/coastal), C4 (heavy coastal/salt-laden environments).
2. Yuav ua li cas xaiv txoj cai Weathering Steel Qib
(1) Raws li daim ntawv thov Scenario
Cov cheeb tsam nyob deb nroog / ib puag ncig hauv nroog(tsis muaj kuab paug, tsis muaj ntsev tsuag):
Xaiv Q235NH (GB / T 4171), ASTM A242, lossis S235J0W (EN 10025-5, C1 / C2 chav kawm). Haum rau cov khoom siv kho kom zoo nkauj (cov nroj tsuag, vaj edging, kos npe) thiab cov teeb pom kev zoo (me me pergolas).
Industrial / ntug hiav txwv nroog ib puag ncig(muaj kuab paug nruab nrab, qee zaus ntsev tsuag):
Xaiv Q355NH (GB/T 4171, Icorr Ntau dua lossis sib npaug rau 8.0), ASTM A588, lossis S355J2W (EN 10025-5, C3 chav kawm). Qhov zoo tshaj plaws rau cov khoom siv (fencing, toj roob hauv pes phab ntsa, sam thiaj planters) thiab cov rooj tog sab nraum zoov.
Hnyav ntug hiav txwv / hnyav kev lag luam ib puag ncig(high ntsev tsuag, kua qaub los nag, hnyav pa phem):
Xaiv rau Q460NH (GB / T 4171, siab Icorr), ASTM A588 Qib A / B, lossis S355J2W (C4 chav kawm). Rau tej yaam num tseem ceeb (seaside choj, ntug hiav txwv tsev facades), xav txog kev ntxiv anti-corrosion coatings (xws li, fluoropolymer clear coats) los txhim kho kev tiv thaiv.
(2) Raws li cov qauv Load Requirement
Kho kom zoo nkauj / tsis yog - thauj khoom - cov ntawv thov(screens, planters, signage):
Ua ntej qis- qib zog (Q235NH, ASTM A242) nrog cov tuab ntawm 1.5-5mm (lub teeb yuag thiab tus nqi- zoo).
Lub teeb- thauj khoom siv cov qauv(lub vaj fencing, me me pergolas, toj roob hauv pes edging):
Xaiv nruab nrab - qib zog (Q355NH, ASTM A588) nrog thicknesses ntawm 4–8mm (sib npaug durability thiab structural stability).
Hnyav -load cov ntawv thov kev tsim qauv(tsev facades, txuas hniav, loj loj sculptures):
Siv cov qib siab - muaj zog (Q460NH, Q550NH, ASTM A588 Qib C) nrog cov tuab ntawm 8-20mm (kom tiv thaiv kev khoov thiab deformation nyob rau hauv hnyav loads).
(3) Raws li kev ua kom zoo nkauj thiab kev xav tau
Rau natural patina aesthetics(tsis muaj ncej- ua tiav):
Xaiv cov qib nrog cov hlau tsis sib xws (Q355NH, ASTM A588) kom ntseeg tau tias kev tsim patina zoo ib yam (tsis txhob xeb tsis sib xws).
Rau kev ua haujlwm nyuaj (khoov, dov, vuam):
Xaiv cov qhab nia zoo ductility (Q235NH, ASTM A242), uas tsis tshua muaj kev tawg thaum tsim khoom; siab - qib zog (Q460NH) yuav tsum tau preheating (100–150 degree) ua ntej khoov / vuam kom txo tau brittleness.
