A588 Qib Ayog lub siab -lub zog, qis- alloy (HSLA) cov qauv hlau hu ua "weathering steel" (feem ntau hu ua Corten), khoom plig rau nws zoo heev atmospheric corrosion kuj, tsim ib tug ruaj khov, tiv thaiv xeb-zoo li patina, ua rau nws zoo tagnrho rau unpainted daim ntaub ntawv superior zoo li txuas hniav, vaj tse, thiab cov tsheb ciav hlau tsis tu ncua. Nws muaj qhov tsawg kawg nkaus tawm lub zog ntawm 50 ksi (345 MPa) thiab yog siv rau hauv welded, bolted, los yog riveted kev tsim kho uas durability thiab zoo nkauj tseem ceeb.
Cov yam ntxwv tseem ceeb
Corrosion Resistance: Tsim cov txheej txheem oxide tiv thaiv, ua kom qeeb ntxiv corrosion; plaub zaug tiv taus ntau dua li cov pa roj carbon steel tsis kho.
Lub zog muaj zog: Yam tsawg kawg nkaus lub zog ntawm 50 ksi (345 MPa), tso cai rau cov qauv sib dua.
Cov tsos mob: Tsim kom muaj qhov tshwj xeeb, zoo nkauj zoo nkauj xeb-zoo li ua tiav thaum raug rau cov khoom.
Daim ntawv thov: choj, vaj tse, tsheb ciav hlau, tsheb loj, tso tsheb hlau luam, thiab cov yam ntxwv ntawm vaj tse.
Qib: Muaj nyob rau hauv Qib A, B, C, thiab K, nrog Qib A feem ntau muaj cov ntsiab lus tshwj xeeb rau cov ntsiab lus xws li Manganese, Chromium, thiab tooj liab.
Puas yog A588 Qib A weldable?
Yog lawm, A588 Qib A yog nkag tau yooj yim weldable siv cov txheej txheem arc vuam, tab sis nws yuav tsum tau ceev faj tshwj xeeb los khaws nws cov corrosion-cov khoom tiv thaiv thiab tiv thaiv kev tawg.
Cov Lus Qhia Tseem Ceeb rau Welding A588 Qib A:
1.Process Compatibility: Haum rau txhua tus txheej txheem txheej txheem:
Shielded Hlau Arc Vuam (SMAW / Stick)
Gas Metal Arc Vuam (GMAW / MIG)
Flux-Cored Arc Vuam (FCAW)
Submerged Arc Welding (SAW)
2.Critical Filler Hlau Xaiv:
Txhawm rau tswj cov huab cua huab cua ntawm cov hlau vuam, koj yuav tsum siv "weathering" hom electrodes.
Common xaiv yog AWS E70xx-W series electrodes (eg, E7018-W1). Lub npe "-W" qhia tias cov hlau muab tub lim yog alloyed kom haum rau corrosion kuj thiab xim patina ntawm lub hauv paus hlau.
Siv cov txheej txheem E70xx electrodes (tsis yog- huab cua) yuav tsim cov vuam uas sib txawv ntawm tus nqi sib txawv, ua rau tsis pom kev zoo thiab muaj peev xwm nyiam corrosion.
3.Preheat & Interpass Kub:
Feem ntau tsis tas yuav tsum tau rau cov ntu nyias (< ¾ inch / 19 mm) at moderate ambient temperatures due to its relatively low carbon equivalent (~0.40-0.45%).
Pom zoo rau cov khoom tuab, cov pob qij txha nruj heev, lossis thaum qhov kub thiab txias qis dua 50℃F (10 degree).
Hom preheat ntau yam: 150-250℃F (65-120 degree).
4. Cov kev coj ua tseem ceeb:
Tsawg-Hydrogen Practice: Yuav tsum tau ua. Siv tsuas yog qhuav, qis-hydrogen (E7018) electrodes thiab khaws cov hlau thiab cov hlau hauv qab kom huv si thiab qhuav kom tsis txhob muaj hydrogen-induced cracking.
Thaum tshav kub kub Input Control: Tsis txhob muaj cov cua kub ntau dhau, uas tuaj yeem ua rau cov cua sov ntau dhau - thaj chaw cuam tshuam (HAZ).
Ncej -Wel Cleaning: Tshem tawm tag nrho cov slag thiab spatter kom huv si. Qhov kawg weld yuav tsum tau sab laug rau huab cua ib txwm; tsis txhob pleev xim tshwj tsis yog tias tag nrho cov qauv yuav tsum tau pleev xim rau.
Vim li cas thiaj xav tau kev saib xyuas tshwj xeeb:
A588 Qib A yog weldable vim nws tswj, qis -carbon chemistry. Txawm li cas los xij, nws cov huab cua kev ua tau zoo nyob ntawm cov ntsiab lus alloy (Cu, Cr, Ni, thiab lwm yam). Yog tias cov hlau vuam tsis sib haum nrog cov khoom sib xyaw no, nws yuav dhau los ua qhov tsis muaj zog hauv qhov corrosion- tiv thaiv kab mob. Tsis tas li ntawd, nws cov alloying tuaj yeem nce hardenability me ntsis, ua qhov kev coj ua zoo tseem ceeb kom tsis txhob HAZ tawg hauv cov ntu tuab.
Cov ntsiab lus:
Yog lawm, nws yog weldable, tab sis kev vam meej yuav tsum tau siv cov huab cua kom raug- qib muab tub lim hlau (E70xx-W series) thiab ua raws li cov txheej txheem hydrogen tsawg. Rau cov khoom tuab los yog nyob rau hauv huab cua txias, siv me ntsis preheat. Nco ntsoov sab laj AWS D1.1/D1.5 thiab cov chaw tsim khoom hlau cov lus pom zoo.
1. A588 Qib A steel siv rau dab tsi?
A588 Qib A feem ntau yog siv rau cov qauv siv xws li txuas hniav, cov tsev, thiab kev tsim kho sab nraum zoov qhov twg nws cov atmospheric corrosion kuj (weathering steel) muaj txiaj ntsig.
2. Lub zog tawm ntawm A588 Qib A yog dab tsi?
Qhov tsawg kawg nkaus yield zog ntawm A588 Qib A yog 50 ksi (345 MPa) rau ntu txog li 4 ntiv tes (100 hli) tuab.
3. A588 Qib A txawv li cas A572 Qib 50?
Qhov sib txawv tseem ceeb yog kev tiv thaiv corrosion: A588 Qib A yog cov hlau huab cua uas tsim cov patina tiv thaiv, thaum A572 Qib 50 yog tus qauv siab - zog qis- alloy (HSLA) hlau xav tau xim lossis txheej rau kev tiv thaiv corrosion.
4. Puas yog A588 Qib A weldable?
Yog lawm, nws yog yooj yim weldable siv cov txheej txheem xws li SMAW, GMAW, thiab FCAW, txawm hais tias nws yuav tsum muaj tsawg tsawg -hydrogen kev coj ua thiab tej zaum yuav xav tau cov hlau muab tub lim kom haum rau cov huab cua.
5. Dab tsi yog qhov corrosion kuj ntawm A588 Qib A?
Nws muaj kwv yees li 4-6 npaug ntawm atmospheric corrosion kuj zoo dua li cov pa roj carbon steel vim nws cov alloying ntsiab (xws li Cu, Cr, Ni), uas tsim ib tug ruaj khov, adherent xeb patina.
6. Puas yog A588 Qib A hlau yuav tsum tau pleev xim?
Tsis yog, pleev xim tsis tas yuav tsum muaj kev tiv thaiv corrosion; nws yog tsim los siv liab qab (tsis pleev xim) los ua ib qho kev tiv thaiv patina. Xim tuaj yeem siv rau kev zoo nkauj.
7. Cov tshuaj muaj pes tsawg leeg ntawm A588 Qib A yog dab tsi?
Nws muaj cov ntsiab lus alloying xws li tooj liab (Cu), chromium (Cr), thiab npib tsib xee (Ni) rau huab cua tsis kam. Cov ntsiab lus tseem ceeb: Carbon max 0.19%, Phosphorus max 0.04%, Copper 0.25-0.40%.
8. Cov European sib npaug ntawm A588 Qib A yog dab tsi?
Qhov ze tshaj plaws nyob sab Europe huab cua sib npaug yog S355J0W lossis S355J2W raws li EN 10025-5, uas muaj qhov zoo sib xws corrosion thiab lub zog.
9. A588 Qib A puas tuaj yeem siv rau hauv thaj chaw ntug dej hiav txwv?
Nws tuaj yeem siv tau, tab sis kev ua haujlwm yuav raug txo qis hauv cov ntug hiav txwv loj (ntsev -} nplua nuj) lossis muaj huab cua zoo heev. Cov qib tshwj xeeb xws li A588 Qib C lossis ntau dua resistant alloys feem ntau pom zoo rau cov xwm txheej zoo li no.
10. Dab tsi yog qhov tsis zoo ntawm A588 Qib A?
Tej zaum qhov tsis zoo muaj xws li: tus nqi pib siab dua li cov qauv hlau, muaj peev xwm ua rau cov dej ntws tawm ntawm cov chaw nyob ib puag ncig thaum tsim patina, thiab txo cov kev tiv thaiv corrosion nyob rau hauv ib puag ncig ntub dej los yog saline heev.
Tag nrho cov specification thiab cov ntsiab lus muaj nyob rau ntawm kev thov. Cov ntaub ntawv saum toj no yog muab rau kev taw qhia nkaus xwb. Rau kev tsim tshwj xeeb thov hu rau peb cov neeg ua haujlwm muag khoom.
