Tsawg npaum li cas yog qhov siab tshaj qhov ntsuas kub ntawm 1.4404 dua li ntawm 310S?

Cov Lus Teb luv luv: Qhov txawv ntawm Txog 230 degree

1.4404 (lub npe EN ntawm UNS S31603, dav hu ua 316L) thiab 310S (UNS S31008, EN 1.4845) yog ob qho tib si austenitic stainless hlau, tab sis lawv yog engineered rau qhov sib txawv kub qhov rais. Hauv kev pabcuam huab cua tas mus li, 1.4404 feem ntau yog ntsuas rau qhov siab tshaj plaws ntawm 870 degree, thaum 310S raug ntsuas txog li 1100℃- qhov sib txawv ntawm kwv yees li 230℃. Qhov sib txawv yog tswj hwm los ntawm cov ntsiab lus chromium thiab npib tsib xee, uas txiav txim siab seb yuav tiv thaiv qhov ntsuas oxide li cas ntawm qhov kub thiab txias.

Tshuaj muaj pes tsawg leeg: Vim li cas 310S kav ntev dua hauv tshav kub

Both grades are chromium-nickel austenitic alloys. 310S carries much more chromium (24.00-26.00%) and nickel (19.00-22.00%), which form a dense and stable chromium-oxide scale that slows further oxidation. 1.4404 adds 2.00-3.00% molybdenum, uas txhim khu kev tiv thaiv rau pitting thiab crevice corrosion nyob rau hauv chlorides, tab sis molybdenum plays me ntsis nyob rau hauv oxidation kuj siab tshaj 800 degree.

Kev muaj pes tsawg leeg ntawm ASTM A240 (wt%):

Element	1.4404 / UNS S31603	310S / UNS S31008
Cov pa roj carbon, max	0.030	0.08
Silicon, max	0.75	1.50
Manganese, max	2.00	2.00
Phosphorus, max	0.045	0.045
Sulfur, max	0.030	0.030
Chromium	16.00-18.00	24.00-26.00
Nickel	10.00-14.00	19.00-22.00
Molybdenum	2.00-3.00	Tsis tau teev tseg
Nitrogen, max	0.10	Tsis tau teev tseg

Mechanical Properties (Annealed Phaj, ASTM A240)

Khoom	1.4404 / S31603	310S / S31008
Tensile zog, min (MPa)	485	515
Yield zog, min (MPa)	170	205
Elongation, min (%)	40	40

Nyob rau hauv chav tsev kub, ob qib yog ze rau lub zog. Qhov sib cais tiag tiag tshwm sim ntawm qhov kub thiab txias: 310S khaws lub zog muaj txiaj ntsig thiab tiv thaiv qhov ntsuas qhov twg 1.4404 yuav oxidize sai thiab poob load-cov kabmob muaj peev xwm nkag mus. Tshaj li ntawm 550 degree, creep - tsis oxidation - feem ntau dhau los ua qhov txwv kev tsim qauv rau ob qib.

Kev txwv qhov kub thiab txias: Kev pabcuam tsis tu ncua thiab sib cuam tshuam

Cov ntawv tshaj tawm kev ntaus nqi rau kev pabcuam huab cua: 1.4404 - txog 870℃nruam thiab 815℃sib tshuam; 310S - txog 1100℃nruam thiab 1035℃intermittent. Cov kev ntsuas no xav tias oxidizing cua thiab tsis muaj qhov tsis txaus ntseeg. Hauv kev txo qis lossis sulfidizing huab cua qhov kev txwv siv tau qis dua, thiab hauv lub tshuab nqus tsev lossis inert- pa roj oxidation tsis yog qhov kev txhawj xeeb ntxiv lawm.

Daim ntawv qhia kev

1.4404: Khoom noj khoom haus thiab dej haus, tshuaj cia, tshuaj cog, tshav kub exchangers thiab marine Cheebtsam uas chloride pitting kuj tseem ceeb thiab cov kev pab cuam nyob rau hauv roughly 500-550℃rau load-bearing qhov chaw.

310S: rauv qhov chaw, cov raj radiant, muffles, cov khoom siv hauv tsev, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab cov khoom siv petrochemical uas qhov kev pab cuam ncav cuag 900-1100℃thiab scaling kuj yog qhov tseem ceeb.

Yog tias ib qho kev tivthaiv yuav pom qhov ntsuas kub siab tshaj li ntawm 900 degree, 1.4404 tsis yog qhov hloov tau rau 310S.

Cov lus nug nquag

Qhov kev pabcuam siab tshaj plaws ntawm 1.4404 yog dab tsi?

Txog 870℃rau kev pabcuam txuas ntxiv hauv huab cua thiab txog 815℃rau kev pabcuam cuam tshuam, raws li tus cwj pwm oxidation. Rau siab-cov kabmob qhov ntsuas qhov ntsuas kub feem ntau yog qis dua vim tias lub zog creep poob siab tshaj li 550℃.

Vim li cas 310S zam qhov kub siab tshaj 1.4404?

310S muaj 24.00-26.00% chromium thiab 19.00-22.00% npib tsib xee, kwv yees li 8 feem pua ​​​​cov ntsiab lus ntau dua ntawm 1.4404. Cov ntsiab lus no tsim ib qho kev loj hlob qeeb, ntau adherent chromium-oxide nplai thiab ua kom cov qauv austenitic ruaj khov ntawm qhov kub thiab txias.

1.4404 puas tuaj yeem hloov 310S hauv qhov cub ua haujlwm ntawm 1000 degree?

Tsis yog. Ntawm 1000℃, 1.4404 oxidizes sai sai thiab poob txhua yam lub zog . 310S yog nyob rau ntawm 1100℃hauv huab cua thiab yog qhov kev xaiv tsim nyog rau cov kev pabcuam zoo li no.

Puas yog 1.4404 zoo dua 310S rau chloride ib puag ncig?

Nyob rau nruab nrab kub, yog. Lub 2.00-3.00% molybdenum hauv 1.4404 muab qhov zoo dua pitting thiab crevice corrosion kuj nyob rau hauv chlorides. Hauv cov kev pabcuam kub chloride, txawm li cas los xij, ob qib yog qhov yooj yim rau kev ntxhov siab corrosion cracking thiab duplex lossis siab dua-alloy qib yuav tsum tau txiav txim siab.

Dab tsi yog EN thiab UNS sib npaug ntawm cov qib no?

1.4404 sib raug rau UNS S31603 thiab EN X2CrNiMo17-12-2 (EN 10088); 310S sib raug rau UNS S31008 thiab EN 1.4845 (X8CrNi25-21).

Qib twg yuav tsum tau siv rau lub siab -kub kub exchanger?

Yog tias cov hlau kub nyob qis dua li 550-600 degree, 1.4404 tuaj yeem tsim nyog thiab muaj kev tiv thaiv corrosion zoo dua hauv cov txheej txheem dej. Tshaj li qhov ntau, 310S - lossis creep- qib ruaj khov xws li 321 lossis 347 rau kev pabcuam ncig 800-900℃- yog qhov kev xaiv nyab xeeb dua.