Txawv Ntawm SS304 thiab SS316 Cov Khoom Siv

SS316 stainless hlau feem ntau yog siv rau cov kev tsheb ciav hlau uas ntsia ze rau cov pas dej lossis hiav txwv. SS304 yog cov ntaub ntawv feem ntau sab hauv lossis sab nraum zoov.
 
Raws li American AISI qib kawm theem pib, qhov sib txawv ntawm 304 lossis 316 thiab 304L lossis 316L yog cov ntsiab lus carbon.
Cov pa roj carbon ntau yog 0.08% tshaj plaws rau 304 thiab 316 thiab 0.030% siab tshaj plaws rau 304L thiab 316L hom.
Tag nrho lwm cov khoom siv yog qhov tseem ceeb zoo ib yam (nickel ntau rau 304 yog 8.00-10.50% thiab rau 304L 8.00-12.00%).
Muaj ob lub European steels ntawm '304L' hom, 1.4306 thiab 1.4307. Tus 1.4307 yog qhov txawv ntawm feem ntau muaj, sab nraum lub teb chaws Yelemees. Cov 1.4301 (304) thiab 1.4307 (304L) muaj cov pa roj carbon ntim ntawm 0.07% siab tshaj plaws thiab 0.030% ntau tshaj plaws. Cov theem chromium thiab npib tsib xee zoo sib xws, nickel rau ob qib muaj qhov tsawg kawg yog 8%. 1.4306 qhov tseem ceeb yog German qib thiab muaj 10% tsawg kawg Ni. Qhov no txo ​​cov ntsiab lus ferrite ntawm cov hlau thiab tau pom tias tsim nyog rau qee cov txheej txheem tshuaj lom neeg.
Cov European qib rau 316 thiab 316L hom, 1.4401 thiab 1.4404, phim rau txhua lub ntsiab nrog cov pa roj carbon ntau ntawm 0.07% siab kawg rau 1.4401 thiab 0.030% siab tshaj plaws rau 1.4404. Tseem muaj Mo siab kawg (2.5% Yam tsawg kawg Ni) ntawm 316 thiab 316L hauv EN system, 1.4436 thiab 1.4432 feem. Txhawm rau kom muaj kev cuam tshuam cov teeb meem ntxiv, tseem muaj qib 1.4435 uas yog ob qho siab hauv Mo (2.5% yam tsawg kawg nkaus) thiab hauv Ni (12.5% ​​tsawg kawg).
 
Qhov cuam tshuam ntawm carbon rau tiv taus corrosion
 
Cov pa roj carbon tsawg dua 'kev hloov pauv' (316L) tau tsim los hloov pauv rau 'qauv' (316) carbon ntau qib kom kov yeej qhov kev pheej hmoo ntawm intercrystalline corrosion (weld lwj), uas tau txheeb pom qhov teeb meem thaum ntxov ntawm kev thov ntawm cov hlau no. Qhov no tuaj yeem ua tiav yog tias cov hlau tau tuav hauv qhov kub thiab txias li 450 txog 850 ° C rau ob peb feeb, nyob ntawm seb qhov kub thiab tom qab ntawd raug rau cov yeeb ncuab xeb ib puag ncig. Kev xeb tas ces yuav siv rau ib thaj tsam ntawm cov noob nplej.
 
Yog tias cov pa roj carbon ntau nyob hauv qis dua 0.030% tom qab no qhov kev cuam tshuam intercrystalline tsis siv qhov chaw hauv qab no raug rau cov kub no, tshwj xeeb tshaj yog rau cov sijhawm uas nquag tau ntsib nyob rau hauv qhov kub raug cuam tshuam ntawm qhov chaw ntawm welds hauv 'tuab' ntu ntawm cov hlau.
 
Cov nyhuv ntawm carbon qib ntawm weldability
 
Muaj kev pom tias cov hom pa roj carbon tsawg dua yog qhov yooj yim dua rau weld dua li cov qauv carbon hom.
 
Nws tsis zoo li qhov tseeb vim li cas rau qhov no thiab qhov sib txawv tej zaum muaj feem xyuam nrog lub zog qis ntawm cov roj carbon tsawg hom. Cov pa roj carbon tsawg hom yuav yooj yim dua rau cov duab thiab daim ntawv, uas nyob rau hauv lem kuj tseem yuav cuam tshuam txog theem ntawm kev nyuaj siab seem tshuav cov hlau tom qab tau tsim thiab haum rau vuam. Qhov no tuaj yeem ua rau 'txheem' pa roj carbon ntau qhov xav tau lub zog ntxiv los tuav lawv hauv txoj haujlwm ib zaug rau lub vuam, nrog ntau cov nyiam caij nplooj ntoos hlav rov qab yog tias tsis muaj qhov chaw zoo.
 
Lub vuam ntim khoom noj rau ob hom yog ua raws li cov pa roj carbon tsawg, kom tsis txhob cuam tshuam txog kev txhawm rau xaim hluav taws xob hauv cov khoom siv weld nugget lossis los ntawm kev sib txawv ntawm cov pa roj carbon mus rau niam txiv (puag ncig) hlau.
 
Muab ntawv pov thawj ob leeg ntawm cov pa roj carbon uas muaj cov pa roj carbon ntau tsawg
 
Kev lag luam tsim cov tub luam, siv cov kev siv cuab yeej siv hlau tam sim no, feem ntau tsim ua cov pa roj carbon monoxide qis uas yog qhov tseeb vim qhov kev tswj tau txhim kho nyob rau niaj hnub steelmaking. Thiaj li ua tiav cov khoom lag luam steel yog feem ntau muab rau kev ua lag luam 'tau ntawv pov thawj' rau ob qib kev tsim vim tias tom qab ntawd tuaj yeem siv rau cov ntaub txiav kom tseeb qib ib qho, nyob hauv tus qauv tshwj xeeb.
 
304 Cov Hom
 
BS EN 10088-2 1.4301 / 1.4307 rau cov qauv European.
ASTM A240 304 / 304L LOSSIS ASTM A240 / ASME SA240 304 / 304L rau cov qauv kev lag luam Asmeskas siab txog ntsha.
316 Cov Hom
 
BS EN 10088-2 1.4401 / 1.4404 rau cov txheej txheem European.
ASTM A240 316 / 316L LOSSIS ASTM A240 / ASME SA240 316 / 316L, rau cov qauv kev lag luam Asmeskas siab txog ntsha.

Lub sij hawm tshaj tawm: Lub Yim Hli-19-2020