ASTM A588 qib A phaj yog lub zog siab qis alloy qauv steel specification nrog txhim kho atmospheric corrosion kuj. ASTM A588 qib A phaj muaj 50ksi yam tsawg kawg nkaus yield zog thiab 70ksi yam tsawg tensile zog. A242 phaj yog cov hlau tsis tshua muaj cov qauv hlau rau cov tswv cuab cov qauv uas qhov hnyav txuag thiab atmospheric corrosion kuj tseem ceeb.
ASTM A588 qib A phaj yog sib npaug rau Corten A steel phaj. A242 phaj yog sib npaug rau Corten B steel phaj. Piv nrog rau cov tsis tshua muaj alloy siab zog steel xws li A572 gr 50, qhov zoo ntawm ASTM A588 qib A phaj thiab A242 phaj yog lawv cov huab cua muaj peev xwm.
Phosphorus (P) Cov ntsiab lus:
A242 (Corten A): Tso cai rau cov ntsiab lus phosphorus ntau dua (keeb kwm txog li 0.15%, tab sis cov qauv niaj hnub no feem ntau qis dua). Phosphorus ho boosts atmospheric corrosion kuj.
A588 (Corten B): nruj me ntsis txwv phosphorus (feem ntau max 0.03-0.04%). Qhov no txhim kho weldability thiab tawg toughness, tshwj xeeb tshaj yog nyob rau hauv thicker seem, ntawm tus nqi ntawm ib co corrosion kuj.
Tensile zog:
A242 (Corten A): Qhia txog lub zog tensile yam tsawg kawg nkaus ntawm 63 ksi (435 MPa) rau Qib 1 & 3, thiab 70 ksi (485 MPa) rau Qib K (ib qho tshiab, muaj zog sib txawv).
A588 (Corten B): Qhia qhov muaj zog tensile yam tsawg kawg nkaus ntawm 70 ksi (485 MPa) rau txhua qib. Qhov no yog qhov tseem ceeb tshaj qhov sib txawv ntawm cov tshuab.
Yield zog:
A242 (Corten A): Yam tsawg kawg nkaus yield zog ntawm 50 ksi (345 MPa) rau cov khoom thicknesses mus txog 0.75 nti (19 mm) nyob rau hauv Qib 1 / Qib 3, thiab siab dua rau Qib K (65 ksi min).
A588 (Corten B): Yam tsawg kawg nkaus yield zog ntawm 50 ksi (345 MPa) rau tag nrho cov khoom thicknesses them los ntawm tus qauv (txog 8 nti / 200mm rau qee qib). Nco ntsoov qhov no siv rau cov ntu nyias; yield zog yuav tsum tau txo qis me ntsis rau cov ntu tuab heev ntawm ob tus qauv.
Weldability & Toughness:
A588 (Corten B): Feem ntau suav hais tias muaj qhov zoo tshaj plaws weldability thiab cuam tshuam toughness (tshwj xeeb tshaj yog nyob rau hauv qis kub thiab nyob rau hauv thicker seem), feem ntau vim nws qis phosphorus thiab carbon cov ntsiab lus.
A242 (Corten A): Thaum weldable, nws cov ntsiab lus P siab dua tuaj yeem ua rau nws yooj yim dua rau kev siv vuam tseem ceeb, tshwj xeeb tshaj yog cov thickness nce ntxiv, yuav tsum tau ua raws li cov txheej txheem vuam tsim nyog.
Lub Hom Phiaj Daim Ntawv Thov Kev Pom Zoo:
A588 (Corten B): Tsim los rau cov qauv siv xws li txuas hniav, tsev, thiab cov khoom siv uas xav tau lub zog siab - rau - qhov hnyav piv, weldability, thiab toughness nyob rau hauv thicker seem thaum tuav zoo atmospheric corrosion kuj. Cov kev xaiv tseem ceeb rau kev xav tau kev tsim qauv.
A242 (Corten A): Tsim pib los muab kev txhim kho atmospheric corrosion kuj. Feem ntau siv tau zoo nyob rau hauv cov ntu nyias rau kev siv vaj tse xws li cladding, fascia, ru tsev, thiab duab puab. Qib K tau ntxiv tom qab sib tw zoo dua nrog A588 ntawm lub zog. Feem ntau cuam tshuam nrog kev zoo nkauj thiab nruab nrab siv cov qauv siv hauv Tebchaws Europe.
Ductility (Elongation):
A588 (Corten B): me ntsis siab dua qhov yuav tsum tau elongation (21% min hauv 8 ntiv tes / 20% hauv 2 ntiv tes) piv rau cov qib A242 ib txwm muaj.
A242 (Corten A): Tsawg kawg elongation rau Qib 1 / Qib 3 yog 18% hauv 8 ntiv tes (15% hauv 2 ntiv tes). Qib K sib tw A588 ntawm 21% hauv 8 ntiv tes.
Khoom siv & Thickness Suitability:
A588 (Corten B): Optimized thiab feem ntau siv rau cov txheej txheem tuab (phaj, duab, tuav txog 8 ntiv tes tuab / 200mm nyob ntawm qib).
A242 (Corten A): Feem ntau txuam nrog cov ntaub ntawv nyias nyias xws li daim ntawv, sawb, thiab daim hlau (tshwj xeeb yog Qib K).
Hauv cov ntsiab lus yooj yim:
A588 (Corten B) yog qhov mus - rau tus qauv rau kev thov cov qauv siv. Qhov twg muaj zog, zoo weldability, thiab toughness (tshwj xeeb tshaj yog nyob rau hauv thicker seem thiab nyob rau hauv qis kub) yog qhov tseem ceeb ntawm corrosion kuj, siv A588 / ASTM A588 / Corten B.
A242 (Corten A) feem ntau xaiv rau kev siv vaj tse lossis siv cov qauv siv hauv cov ntu nyias. Qhov siab tshaj plaws corrosion kuj nyob rau hauv nyias seem yog qhov tseem ceeb thiab lub siab tshaj plaws tensile zog yuav tsum tau ntawm A588 yog tsis xav tau (tshwj xeeb tshaj yog rau Qib 1/3), A242 / ASTM A242 / Corten A yog haum. Qib K ntawm A242 txuas lub zog sib txawv rau cov ntu nyias.
