Dab tsi stainless hlau yog qhov zoo tshaj plaws rau kev kub siab?

Yuav ua li cas xaiv lub tshav kub-Resistant Stainless Steel

Xaiv cov cua sov kom raug-cov hlau tsis muaj zog yog qhov tseem ceeb rau lub sijhawm ntev - cov khoom siv kev ntseeg siab, kev tswj xyuas tus nqi thiab kev nyab xeeb ntawm kev ua haujlwm. Hauv petrochemical ua, tsim hluav taws xob, hluav taws xob hloov hluav taws xob, lub tshuab hluav taws xob thiab cov pa tawm, cov khoom raug oxidation, thermal cycling, creep stress thiab corrosive media ib txhij. Rau cov thawj coj thiab cov neeg yuav khoom engineering, cov lus nug tsis yog tsuas yog qib twg muaj kev kub ntxhov, tab sis qhov uas muaj qhov zoo tshaj plaws ntawm kev sib npaug ntawm oxidation tsis kam, creep zog, weldability, thermal- qaug zog tus cwj pwm thiab lub neej voj voog tus nqi ntawm cov kev ua haujlwm tiag tiag. Cov lus hauv qab no qhia txog cov txheej txheem qeb duas, nrog cov ntaub ntawv rau kev pabcuam hauv huab cua qhuav.

Kev sib piv ntsuas kub

Qib	Max. Nruam (C)	Max. Kev sib tshuam (C)	Kev ntsuas kub (C)	Cov yam ntxwv tseem ceeb
304 (S30400)	800	870	850	Ua raws li carbide nag lossis daus
316L (S31603)	800	870	850	Zoo dua 304 hauv chlorides
321 (S32100)	815	900	850	Titanium{0}}stabilized, tso pa tawm
309S (S30908)	1000	1050	1000	High Cr / Ni rau cyclic cua sov
310S (S31008)	1100	1150	1100	25Cr-20Ni, zoo heev rau qhov cub
UNS S30815	1150	1150	1150	Siab N + Si + tsawg ntiaj teb, creep zog
446 (S44600)	1100	1150	1150	Ferritic, tsis muaj Ni, zoo nyob rau hauv sulfur gases

Siab siab -Tsuas Kub (1000-1150 C)

Thaum cov khoom siv yuav tsum tiv taus qhov kub thiab txias nyob rau hauv cov khoom siv thauj khoom lossis tsis tshua muaj thermal shock, UNS S30815 thiab 310S yog qhov zoo tshaj plaws -tsim xaiv. UNS S30815 yog qib siab -nitrogen austenitic qib ntxiv dag zog nrog nitrogen, silicon thiab tsis tshua muaj - ntiaj teb ntxiv xws li cerium. Nws tuav lub zog siab txog li 1150 C, thiab nws cov nplai oxide yog qhov ruaj khov thiab tiv taus kev sib kis, uas haum rau cov khoom siv hluav taws xob, cov raj xa hluav taws xob, cov khoom siv hluav taws xob thiab cov khoom siv cua sov uas nquag pib - nres cycles. Saum toj no 900 C nws lub zog creep yog ho superior rau 310S, thiab nws cov nqi alloy feem ntau yog qis dua . 310S (25Cr{17}}}20Ni) muaj oxidation zoo heev thiab carburisation kuj, zoo weldability thiab formability, thiab yog ntsuas rau kev pab tas mus li 1150 C; nws yog tus qauv rau cov khoom siv hluav taws xob, lub tshuab hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, cov khoom siv hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob, hluav taws xob

Nruab nrab- rau- Qib Kub Kub (870-1000 C)

309S yog qhov qis- carbon siab- qib austenitic alloy nrog kev ua haujlwm tsis tu ncua- muaj peev xwm ua haujlwm txog li 1038 C (1900 F). Nws cov ntsiab lus siab chromium thiab npib tsib xee txhawb kev rov ua kom sov dua, thiab qis -carbon variant minimizes carbide nag lossis daus, yog li nws tau siv dav hauv cov khoom siv hluav taws xob thiab cov khoom siv hluav taws xob hloov pauv raws li kev hloov kho dua tshiab rau 304. Titanium-stabilized 321 yog lub workhorse rau kev khiav hauj lwm tsis tu ncua thiab cyclic. 815-870 C (txog 925 C hauv qee qhov kev ntsuas), thiab cov titanium ntxiv tiv thaiv chromium carbide nag lossis daus ntawm 425 thiab 816 C, yog li nws ua rau corrosion kuj nyob rau hauv dav hlau- cav tso pa tawm ducts, bellows, thermal-expansion Cheebtsam thiab boiler qhov chaw uas loads.

Yog vim li cas 316L tsis haum saum 900 C

316L tsis tuaj yeem tsim qhov ntom ntom, ruaj khov tiv thaiv oxide saum toj li 850 C vim tias nws cov ntsiab lus chromium tsawg dhau rau txoj cai ntawd; siab tshaj 600 C nws lub zog txhua yam poob qis, thiab ntev - kev pabcuam ua rau sagging thiab deformation nyob rau hauv nws tus kheej qhov hnyav. Qhov ntsuas 800-870 C hauv lub rooj qhia txog kev coj tus cwj pwm oxidation ntawm cov khoom me me, tsis thauj khoom-cov kabmob tsim. Rau ib lub luag hauj lwm yam ntxwv saum toj no roughly 800 C, txav mus rau 309S, 310S, UNS S30815 los yog cam khwb cia tshav kub-resistant alloy validated los ntawm creep cov ntaub ntawv los ntawm cov qauv siv.

Nruam vs Intermittent Service Ratings

Kev ntsuas kev pabcuam txuas ntxiv siv tau thaum cov khoom nyob ntawm qhov ntsuas kub tsis tu ncua rau lub sijhawm ntev; Tom qab ntawd oxidation thiab creep yog qhov kev tswj hwm. Ib qho kev ntsuam xyuas tsis tu ncua siv rau kev rov ua cua sov thiab cua txias, qhov twg oxide nplai tawg thiab spalls nyob rau hauv thermal expansion thiab contraction thiab thermal qaug zog ua qhov kev txhawj xeeb. Cov kev txwv tsis sib xws feem ntau qis dua qhov txwv tsis tu ncua rau tib qib, thiab qhov ua tau zoo tshaj plaws yog nyob ntawm ntu tuab, huab cua thiab qib kev ntxhov siab. Rau kev pab cuam cyclic, qib nrog spall- tiv taus oxide nplai - UNS S30815, 310S thiab 309S - yog nyiam tshaj 304 thiab 316L.

Cov lus nug nquag

Q1. Dab tsi stainless hlau tuaj yeem tiv taus 1000 C?
309S tuaj yeem ua haujlwm tsis tu ncua txog li 1000 C; 310S thiab UNS S30815 raug ntsuas rau 1100-1150 C. Tshaj 900 C, creep zog thiab oxidation yuav tsum tau kuaj xyuas cov ntaub ntawv tsim los ntawm cov qauv siv tau.

Q2. UNS S30815 yog dab tsi?
UNS S30815 yog qhov nruab nrab ntawm qhov siab -nitrogen austenitic stainless hlau alloyed nrog silicon thiab tsis tshua muaj - ntiaj teb cov ntsiab lus xws li cerium, tsim rau kev nkag siab thiab thermal- qaug zog tiv taus txog li 1150 C.

Q3. Puas yog 310S zoo dua UNS S30815?
310S tau zoo dua weldability, formability thiab oxidation kuj nyob rau hauv complex atmospheres; UNS S30815 muaj qhov ua tau zoo dua ntawm kev nkag siab siab tshaj 900 C thiab feem ntau qis dua cov nqi hlau. Qhov kev xaiv nyob ntawm seb qhov load lossis huab cua tswj.

Q4. Vim li cas 321 siv nyob rau hauv lub tshuab pa?
Titanium stabilization tiv thaiv rhiab heev nyob rau hauv 425-816 C ntau yam, yog li welded thiab tsim cov khoom ua kom lawv cov corrosion kuj thaum rov ua cua sov thiab txias, nrog rau kev ntsuam xyuas txog li 815-900 C.

Q5. Dab tsi yog qhov kub siab tshaj plaws rau 304 stainless hlau?
Rau oxidation kuj nyob rau hauv qhuav huab cua, txog 800 C tas mus li thiab 870 C intermittent. Saum toj no, nplai spalling nrawm, thiab qib xws li 309S lossis 310S yuav tsum tau ua.