434 vs 436 Stainless hlau: Ferritic Molybdenum{2}}Txhim kho Alloys

 

Lub hauv paus muaj pes tsawg leeg thiab kev siv thawj zaug ntawm 434 thiab 436 yog dab tsi?
Ob qib yog raws li 17% chromium nrog li 1% molybdenum ntxiv. Qib 434 (UNS S43400) yog hom Mo-cov kabmob ferritic. Qib 436 (UNS S43600) muaj lub hauv paus zoo sib xws tab sis ntxiv titanium lossis niobium kom ruaj khov. Lawv yog siv nyob rau hauv automotive trim, architectural daim ntaub ntawv, thiab cov khoom siv uas muaj corrosion kuj ntau dua 430 xav tau, xws li nyob rau hauv ntub dej los yog ntug hiav txwv dej.

Yuav ua li cas molybdenum txhim kho lawv cov kev ua tau zoo tshaj 430?
Molybdenum ho txhim khu kev tiv thaiv rau pitting thiab crevice corrosion. Qhov no yog tshwj xeeb tshaj yog muaj txiaj ntsig nyob rau hauv ib puag ncig uas muaj cov tshuaj chlorides, xws li txoj kev ntsev los yog ntug hiav txwv cua. Ob qho tib si 434 thiab 436 yog li muab lub neej ua haujlwm ntev dua thiab zoo dua qhov kev tuav pov hwm zoo dua li 430 thaum raug rau cov kab mob corrosive.

Vim li cas qhov stabilization hauv 436 tseem ceeb rau kev tsim khoom?
Lub titanium los yog niobium hauv 436 stabilizes carbon thiab nitrogen. Qhov no tiv thaiv kev tsim cov chromium carbide ntau dhau thaum vuam lossis siab - raug kub. Yog li ntawd, 436 tuav zoo dua ductility thiab corrosion kuj nyob rau hauv lub weld cheeb tsam piv rau unstabilized 434, ua rau nws ntau haum rau fabricated Cheebtsam.

Hauv daim ntawv thov twg yuav tsum 436 nyiam dua 434?
Xaiv 436 rau txhua daim ntawv thov uas cuam tshuam nrog vuam, xws li qee yam khoom siv hauv tsheb lossis welded architectural seem. Nws ruaj khov chemistry ua kom cov welded sib koom ua ke tseem tawv thiab corrosion-resistant. Rau cov uas tsis yog-welded qhov chaw xws li luas lossis yob- tsim cov profiles, 434 muab cov txiaj ntsig molybdenum ntawm tus nqi qis dua.

Txoj kev xaiv zaum kawg rau cov qib no yog dab tsi?
Cia koj cov txheej txheem fabrication coj txoj kev xaiv. Yog tias koj cov khoom yuav tsum tau vuam, qhia 436 rau kev ua tau zoo. Rau cov khoom ua los ntawm kev txiav thiab khoov nkaus xwb, 434 yog tus nqi zoo heev - txhim kho zoo los ntawm 430 rau kev txhim kho corrosion. Ib txwm paub meej tias qhov chaw raug cuam tshuam nrog cov peev txheej txhim kho cov qib molybdenum muab.