309 vs 310 Stainless Hlau: Siab - Kub Oxidation Resistant Alloys

 

Dab tsi yog qhov tseem ceeb ntawm kev sib xyaw ua ke thiab kev siv ib txwm siv?
Ob lub alloys muaj siab chromium thiab npib tsib xee los tiv thaiv oxidation. Qib 309 feem ntau muaj 22-24% Cr thiab 12-15% Ni. Qib 310 muaj ntau dua: 24-26% Cr thiab 19-22% Ni. Qhov no ua rau 310 muaj peev xwm tiv taus qhov kub thiab txias. Lawv feem ntau yog siv rau cov khoom siv rau cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob.

Lawv cov siab -kub oxidation kuj piv li cas?
Qhov siab dua chromium hauv 310 ua rau muaj kev ruaj khov thiab tiv thaiv oxide nplai (Cr₂O₃) ntawm qhov kub thiab txias. Thaum 309 zoo heev txog li 980℃(1800℃F), 310 tuaj yeem siv txuas ntxiv mus txog li 1150℃(2100℃F) hauv oxidizing atmospheres. Rau cyclic cua sov thiab cua txias, 310's scale kuj yog ntau adherent thiab spalls tsawg yooj yim.

Nyob rau hauv qhov tshwj xeeb cua sov cua yog ib qib nyiam dua lwm tus?
Xaiv 310 kom muaj zog oxidizing cov huab cua (cua dhau cua) ntawm qhov kub siab tshaj plaws thiab qhov chaw tiv thaiv carburization (carbon pickup) yog qhov tseem ceeb. Qib 309 feem ntau yog xaiv rau cov oxidizing nruab nrab kom txo cov cua thiab qhov twg cov tshuaj sulfur muaj nyob, vim nws tswj tau qhov zoo ntawm tus nqi qis. Nws kuj ua hauj lwm zoo raws li tus nqi qis dua - cov khoom siv rov qab rau 310 ntawv nyiaj.

Dab tsi yog qhov tseem ceeb ntawm kev txiav txim siab rau cov qib no?
Ob leeg muaj kev ua haujlwm siab hardening tus nqi, xav tau ntau lub zog rau kev sib sau. Lawv tuaj yeem raug welded siv qhov sib txuam lossis ntau dua -cov hlau muab tub lim (xws li 309 rau 309, 310 rau 310). Tom qab-weld annealing yog pom zoo kom rov zoo corrosion thiab kub tsis kam. Lawv cov ntsiab lus siab alloy kuj ua rau lawv kim dua rau lub tshuab dua li cov qauv qib xws li 304.

Dab tsi yog cov lus qhia kawg rau kev xaiv ntawm 309 thiab 310?
Ua raws li qhov kev txiav txim siab ntawm qhov siab tshaj plaws ua haujlwm kub thiab cua. Rau qhov hnyav tshaj plaws, qhov siab tsis tu ncua -kub oxidizing tej yam kev mob siab tshaj 1000 degree, qhia 310. Rau kev pab cuam sib tshuam, qis ncov kub, lossis qhov twg tus nqi yog qhov tseem ceeb, 309 muab kev ua haujlwm zoo. Ib txwm paub meej tias qhov tseeb ntawm qhov cub cua muaj pes tsawg leeg nrog cov khoom tsim khoom.