N08904 thiab S31254yog ob qho tib si super austenitic stainless hlau, uas tau ua tiav kev tiv thaiv corrosion deb tshaj li cov pa stainless hlau los ntawm kev tsim alloy siab. Lawv tau dav siv nyob rau hauv hnyav corrosive ib puag ncig xws li tshuaj lom neeg, dej hiav txwv, thiab kev tiv thaiv ib puag ncig. HT PIPE yog SS904l thiab ss254smo tus xa khoom nrog 15+ kev xa tawm.Tiv tauj pebkom paub ntau ntxiv thiab quotes dawb!
N08904 thiab s31254 tshuaj muaj pes tsawg leeg
| Element | N08904 (Mass Fraction, %) | S31254 (Mass Fraction, %) |
|---|---|---|
| Cov pa roj carbon (C) | Tsawg dua lossis sib npaug li 0.020 | Tsawg dua lossis sib npaug li 0.020 |
| Silicon (Si) | Tsawg dua los yog sib npaug li 1.00 | Tsawg dua lossis sib npaug li 0.80 |
| Manganese (Mn) | Tsawg dua lossis sib npaug li 2.00 | Tsawg dua los yog sib npaug li 1.00 |
| Phosphorus (P) | Tsawg dua lossis sib npaug li 0.045 | Tsawg dua lossis sib npaug li 0.030 |
| Sulfur (S) | Tsawg dua lossis sib npaug li 0.035 | Tsawg dua lossis sib npaug li 0.010 |
| Chromium (Cr) | 19.00-23.00 | 19.50-20.50 |
| Nickel (Ni) | 23.00-28.00 | 17.50-18.50 |
| Molybdenum (hli) | 4.00-5.00 | 6.00-6.50 |
| Nitrogen (N) | Tsawg dua lossis sib npaug li 0.10 | 0.18-0.22 |
| Copper (Cu) | 1.00-2.00 | 0.50-1.00 |
| Hlau (Fe) | Tshuav | Tshuav |
Technical Overview: Qhov txawv ntawm Core
Lub ntsiab sib txawv ntawm ob lub alloys yog lawv txoj hauj lwm ntawm cov nplai metallurgy:
UNS N08904 (904L) UAyog cov hlau alloyed austenitic stainless hlau uas muaj cov pa roj carbon tsawg thiab cov tooj liab siab, tsim los tiv thaiv qhov hnyav sulfuric acid ib puag ncig.
UNS S31254 (254 SMO)yog cais raws li ib tugsuper austenitic stainless hlau. Nws nta loj heev 6% molybdenum boost nrog rau kev txhob txwm nitrogen ntxiv, tsim tshwj xeeb rau siab -chloride seawater thiab bleaching daim ntaub ntawv.
N08904 thiab S31254 Resistance rau pitting thiab crevice corrosion
Tus nqi PREN ntawm N08904 yog hais txog 36, thiab nws ua tau zoo hauv kev txo cov kua qaub xws li dilute sulfuric acid thiab phosphoric acid. ss904l muaj qee yam tsis kam rau pitting thiab crevice corrosion, tab sis nws qhov kev ua tau zoo yog txwv nyob rau hauv qhov chaw siab chloride ion.
Tus nqi PREN ntawm S31254 yog ntau dua lossis sib npaug rau 43, thiab qee qhov khoom tuaj yeem ncav cuag 42-44, deb tshaj N08904. Cov khoom no tuaj yeem tiv taus ib puag ncig nrog chloride ion concentration Tsawg dua lossis sib npaug li 50000ppm, thiab nws cov pitting tus nqi tsuas yog 1/10 ntawm 316L stainless hlau.
UNS N08904 thiab UNS S31254 Acid thiab alkali corrosion kuj
N08904 muaj kev ua tau zoo hauv cov kua qaub hnyav, tshwj xeeb tshaj yog nyob rau hauv cov ntshiab phosphoric acid, thiab tuaj yeem tiv thaiv corrosion los ntawm cov xov xwm xws li acetic acid, ammonium phosphate, electrolyte, oxalic acid, superphosphate, zinc sulfate, thiab lwm yam.
S31254 muaj kev tiv thaiv zoo rau oxidizing acids (xws li nitric acid) thiab txo cov kua qaub (xws li sulfuric acid thiab hydrochloric acid), tab sis nws lub hom phiaj kev ua tau zoo hauv cov ntshiab phosphoric acid tsis zoo li N08904.
N08904 thiab S31254 Lwm yam kev tiv thaiv corrosion
Kev nyuaj siab corrosion cracking kuj:Ob leeg txwv txoj kev pheej hmoo ntawm kev tawg hauv cov tshuaj chloride ib puag ncig los ntawm cov ntsiab lus alloy siab, tab sis S31254 muaj kev sib tsoo zoo dua nyob rau hauv siab - kub thiab siab chloride ion ib puag ncig.
Antibacterial kev ua tau zoo:The high chromium content of S31254 can form a dense passivation film, inhibit microbial adhesion, and comply with FDA/EC1935 food grade standards. N08904 tsis muaj daim ntawv pov thawj pom zoo rau pej xeem muaj tshuaj tua kab mob.
904l thiab 254smo Kub ua tshuab
N08904:Nyob rau hauv chav tsev kub, uns n08904 muaj ib tug ntshiab austenitic qauv thiab undergoes tsis structural transformation kev nyuaj siab los ntawm cov kua theem mus rau cov khoom theem. Txawm li cas los xij, nws yooj yim rau coarsening ntawm nplej thiab intergranular enrichment ntawm cov ntaub ntawv uas tsis tshua muaj melting point, uas yuav ua rau microcracks sab hauv.
S31254:Qhov kub ua haujlwm kub yog 982-1149℃(1800-2100℃F). Tshaj qhov ntau yam no yuav ua rau muaj kev nce hauv cov khoom oxide nplai thiab txo qis hauv kev ua haujlwm. Tom qab ua haujlwm kub, annealing kev kho mob (1149-1204 degree) thiab dej quenching yuav tsum tau los kho qhov siab tshaj plaws corrosion kuj.
ss254smo thiab ss904l txias ua hauj lwm txheej txheem
N08904: Kev ua haujlwm txias yog cuam tshuam los ntawm cov qauv austenite, thiab cov yas yog qhov zoo. Txawm li cas los xij, vim muaj cov ntsiab lus ntawm cov alloy siab, lub siab loj yog xav tau rau kev ua haujlwm txias, thiab tsis muaj cov ntaub ntawv qhia meej rau pej xeem txog ntawm qhov tshwj xeeb hardening.
S31254: Kev ua haujlwm txias tuaj yeem siv cov txheej txheem ib txwm ua. Tom qab ua haujlwm txias, cov khoom siv lub zog thiab lub zog tuaj yeem txhim kho ntxiv, thiab nws cov tawv tawv tuaj yeem ua tiav los ntawm kev ua haujlwm txias, uas tsis teb rau kev kho cua sov hardening.
N08904 thiab S31254 vuam txheej txheem
N08904: 904L siv vuam cov ntaub ntawv uas phim super austenitic stainless hlau. Nws tswj cov vuam kub kom tsis txhob coarse nplej.
S31254: Cov khoom siv vuam tshwj xeeb yog xav tau rau vuam, thiab cov vuam hlau pom zoo yog AWS A5.14 ERNiCrMo-3 lossis alloy 625. Lub vuam pas nrig yuav tsum ua raws li tus qauv AWS A5.11 ENiCrMo-12, thiab lub zog tsis txaus los ntawm cov khoom siv vuam tsis zoo yuav tsum raug zam thaum lub sijhawm vuam.
