SS316 stainless hlau feem ntau yog siv rau cov railings ntsia ze ntawm pas dej lossis hiav txwv.SS304 feem ntau yog cov khoom siv sab hauv tsev lossis sab nraum zoov.
Raws li American AISI qib 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% siab tshaj plaws rau 304 thiab 316 thiab 0.030% siab tshaj plaws rau 304L thiab 316L hom.
Tag nrho lwm cov ntsiab lus tseem ceeb yog tib yam (nickel ntau yam 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.Lub 1.4307 yog qhov txawv tshaj plaws uas muaj, sab nraum lub teb chaws Yelemees.1.4301 (304) thiab 1.4307 (304L) muaj cov pa roj carbon ntau ntawm 0.07% siab tshaj plaws thiab 0.030% siab tshaj, feem.Cov chromium thiab npib tsib xee ntau zoo sib xws, npib tsib xee rau ob qib muaj qhov tsawg kawg nkaus 8%.1.4306 yog qhov tseem ceeb ntawm qib German thiab muaj 10% Ni.Qhov no txo cov ntsiab lus ferrite ntawm cov hlau thiab tau pom tias tsim nyog rau qee cov txheej txheem tshuaj.
Cov qib European rau 316 thiab 316L hom, 1.4401 thiab 1.4404, phim rau txhua lub ntsiab lus nrog cov pa roj carbon ntau ntawm 0.07% siab tshaj plaws rau 1.4401 thiab 0.030% siab tshaj plaws rau 1.4404.Kuj tseem muaj Mo versions siab (2.5% tsawg kawg Ni) ntawm 316 thiab 316L hauv EN system, 1.4436 thiab 1.4432 raws li.Txhawm rau kom muaj teeb meem nyuaj ntxiv, kuj tseem muaj qib 1.4435 uas yog ob qho tib si hauv Mo (2.5% yam tsawg kawg nkaus) thiab hauv Ni (12.5% yam tsawg kawg nkaus).
Kev cuam tshuam ntawm carbon rau corrosion kuj
Cov pa roj carbon qis 'variants' (316L) tau tsim los ua lwm txoj hauv kev rau 'tus qauv' (316) carbon ntau qib kom kov yeej txoj kev pheej hmoo ntawm intercrystalline corrosion (weld decay), uas tau pom tias yog ib qho teeb meem nyob rau hauv thaum ntxov hnub ntawm daim ntawv thov ntawm cov hlau no.Qhov no tuaj yeem tshwm sim yog tias cov hlau tuav hauv qhov kub ntawm 450 txog 850 ° C rau lub sijhawm ob peb feeb, nyob ntawm qhov ntsuas kub thiab tom qab raug cuam tshuam rau cov cheeb tsam corrosive.Corrosion ces yuav tshwm sim nyob ib sab ntawm grain ciam teb.
Yog tias cov pa roj carbon qis qis dua 0.030% ces qhov kev cuam tshuam ntawm intercrystalline tsis tshwm sim tom qab raug rau qhov kub thiab txias, tshwj xeeb tshaj yog rau cov sij hawm ib txwm muaj nyob rau hauv thaj tsam kub cuam tshuam ntawm welds hauv 'thick' seem ntawm cov hlau.
Qhov cuam tshuam ntawm qib carbon ntawm weldability
Muaj kev pom tias cov pa roj carbon tsawg yog yooj yim rau vuam dua li cov qauv carbon hom.
Tsis zoo li yuav muaj qhov laj thawj meej rau qhov no thiab qhov sib txawv yog tej zaum cuam tshuam nrog lub zog qis ntawm cov pa roj carbon tsawg.Cov pa roj carbon tsawg yuav yooj yim dua rau kev tsim thiab tsim, uas nyob rau hauv lem kuj yuav cuam tshuam cov theem ntawm residual kev nyuaj siab sab laug cov hlau tom qab yog tsim thiab haum rau vuam.Qhov no yuav ua rau cov 'tus qauv' cov pa roj carbon monoxide xav tau ntau lub zog los tuav lawv nyob rau hauv txoj hauj lwm ib zaug haum rau vuam, nrog rau ntau lub caij nplooj ntoos hlav-rov qab yog tias tsis tuav hauv qhov chaw.
Lub vuam consumables rau ob hom yog raws li nyob rau hauv ib tug tsawg carbon muaj pes tsawg leeg, kom tsis txhob intercrystalline corrosion txaus nyob rau hauv lub solidified weld nugget los yog los ntawm diffusion ntawm carbon rau hauv niam txiv (ib puag ncig) hlau.
Dual-certification ntawm tsawg carbon muaj pes tsawg leeg steels
Kev lag luam tsim cov hlau, siv cov txheej txheem steelmaking tam sim no, feem ntau tsim tawm raws li cov pa roj carbon tsawg raws li qhov teeb meem ntawm kev txhim kho kev tswj hwm niaj hnub steelmaking.Yog li cov khoom siv hlau tiav feem ntau tau muab rau lub khw 'dual certified' rau ob qho kev xaiv qib raws li lawv tuaj yeem siv rau fabrications qhia txog qib twg, nyob rau hauv ib qho qauv.
304 yam
BS EN 10088-2 1.4301 / 1.4307 rau European tus qauv
ASTM A240 304 / 304L lossis ASTM A240 / ASME SA240 304 / 304L rau Asmeskas cov txheej txheem siab lub nkoj.
316 yam
BS EN 10088-2 1.4401 / 1.4404 rau European tus qauv
ASTM A240 316 / 316L lossis ASTM A240 / ASME SA240 316 / 316L, rau Asmeskas cov txheej txheem siab lub nkoj.
Post lub sij hawm: Aug-19-2020