22Cho stainless hlau stainless hlau stainless hlau (uns s31803 / s32203) yog ferritic- Austenitic stainless hlau tau tus kheej ntawm ntxhib hlau uas pom los ntawm micrenttructure ntawm ntxhib 50% ferrite thiab 50% austenite. Tus qauv no muab kev sib txuam zoo ntawm lub zog thiab corrosion tsis kam.
Qhov tseem ceeb kom tau txais txiaj ntsig 22cr dhau tus qauv stainless hlau (zoo li 304/316) yog nwssuperior resistance rau kev ntxhov siab corrosion tawg (SCC), pitting, thiab cov nyom corrosion, tshwj xeeb hauv chloride - muaj ib puag ncig. Nws tseem muaj kwv yees liob zaug ntxiv lub zogntawm cov pa roj tsis huv ntawm cov hlau tsis huv.
Cov Ntsiab Lus Tseem Ceeb & Cov yam ntxwv
| Parameter qeb | Kev piav txog |
|---|---|
| Cov Qauv Txheej Txheem | ASTM A790 / A928 (Seamless & Welded Kav) |
| Cov lej tsis muaj | S31803(Qauv 22cr) S32205(Niaj hnub nimno, "leaner" chemistry variant nrog lav pitting tsis kam) |
| Raug lag luam npe | 2205(Nov yog lub npe lag luam feem ntau ntawm S32205) |
| Tus yuam sij | Zoo heev rau pitting, crevice corrosion, thiab kev nyuaj siab corrosion tawg (SCC). |
| Kev tsim | Kwv yees li 50% ferrite () + 50}% Austenite () |
| Neeg Kho Tshuab Muaj Zog | High paib lub zog, feem ntau> 450 mpa (65 ksi), txog ob npaug ntawm 316L. |
Khoom Cov Lus: Cov Khoom Siv Tshuaj & Cov Khoom Siv Neeg Kho Tshuab
Cov lus 1: Tshuaj lom neeg (hnyav%)
| Lub ntsiab | Unc unic s31803 | Unc unru s32205 | Raug 2205 Yeeb Nkab |
|---|---|---|---|
| Chromium (cr) | 21.0 - 23.0 | 22.0 - 23.0 | ~22.5 |
| Npib tsib caug (ni) | 4.5 - 6.5 | 4.5 - 6.5 | ~5.5 |
| Molybdenum (mo) | 2.5 - 3.5 | 3.0 - 3.5 | ~3.2 |
| Manganese (mn) | Tsawg dua los yog sib npaug rau 2.0 | Tsawg dua los yog sib npaug rau 2.0 | ~1.2 |
| Silicon (si) | Tsawg dua los yog sib npaug rau 1.0 | Tsawg dua los yog sib npaug rau 1.0 | ~0.5 |
| Nitrogen (n) | 0.08 - 0.20 | 0.14 - 0.20 | ~0.17 |
| Carbon (c) | Tsawg dua los yog sib npaug rau 0.030 | Tsawg dua los yog sib npaug rau 0.030 | ~0.020 |
| Phosphorus (p) | Tsawg dua los yog sib npaug rau 0.030 | Tsawg dua los yog sib npaug rau 0.030 | ~0.025 |
| Sulphur (s) | Tsawg dua los yog sib npaug rau 0.020 | Tsawg dua los yog sib npaug rau 0.020 | ~0.001 |
| Hlau (FE) | Seem | Seem | Seem |
Nco tseg:S32205 muaj kev tswj hwm ntawm CR, MO, thiab N kom paub tseeb tias yog qhov zoo dua ferrite- Austenite tshuav nyiaj li cas thiab siab duaPitting tiv thaiv tus lej sib npaug (pren).
Pren calculation: Pren =% cr + 3.3 (% mo)+ 16 (% n)
Rau s32205, pren yog feem ntau33-36, ua rau nws muaj kev tiv taus pitting.
Rooj 2: Cov cuab yeej siv neeg kho mob (ntawm chav sov)
| Ntiag tug | Cov nqi raug | ASTM A790 / A928 Yam tsawg kawg nkaus yuav tsum tau ua (kwv yees li) |
|---|---|---|
| Lub zog tensile | 620 - 760 mpa mpa (90 - 110 ksi) | 620 MPA (90 KSI) |
| Tawm Zog (0.2% offset) | 450 - 550 mpa mpa (65 - 80 ksi) | 450 MPa (65 KSI) |
| Elongation (% hauv 2 ") | 25% | 25% |
| Hardness (Brinell HBW) | 220 - 290 | 290 max |
| Kev Cuam Tshuam Lub Zog (Charpy V - Itch) | >100 j @ -40 degree | Feem ntau teev los ntawm kev xaj xaj |
Cov Khoom Siv Lub Cev
Ntawj ntom:7.8 G /M³
Melting ntau yam:1380 - 1440 degree
Thermal Expansion:13.7 x 10⁻⁶ / k (20-100 Qib)
Thermal Condivity:19 W / min k (100 degree)
Corrosion Kuj Hais Lus
Zoo PITITER & CREVICE Corrosion Kuj:Vim tias muaj pren siab, outperforms 316L tseem ceeb.
Kev ntxhov siab corrosion cracking (SCC):Heev tiv tau mus rau chloride -}} indicts scc, hom tsis muaj ua hauj lwm rau 304/316 hauv kev pabcuam sov chloride sov.
GENERAL Corrosion:Tsis kam tawm tsam ntau yam ntawm cov acids, alkalis, thiab lwm yam tshuaj, zoo ib yam li lossis zoo dua 316L.
Txwv Txwv:Tsis pom zoo rau kev pabcuam kub siab tshaj ~ 300℃(570℃f) vim embrittlement los ntawm theem theem nrab nag lossis daus.
Cov Kev Siv Cov Ntawv Siv
22Cho txiv qaub yog dav siv nyob rau hauv kev sib hlub ntawm kev lag luam:
Roj & Roj:
Cov kab khiav, sib sau ua kab, thiab cov kab txhaj tshuaj.
Downhole tubing thiab casing rau corrosive Wells.
Txheej Txheem Piping hauv Rechnory thiab ntug dej platform tuav qaub qaub qaub (h -} muaj cov kua dej).
Tshuaj lom neeg & petrochemical ua:Cov kev pauv hluav taws xob tshav kub, reactor txias, thiab txheej txheem cov kav dej.
Pulp & Daim Ntawv Kev Lag Luam:Deroester thiab ua kom dawb cov kav dej piping.
Desalination:Siab - h siab ro week thiab brine rhaub tubing.
Tubrog nkoj & Davehore:Dej hiav txwv piping tshuab, tshuab hluav taws kub.
Cov Khoom Siv Muaj Cov Khoom Siv
Seamless kav (Astm A790)
Welded Kav (Astm A928){{0- feem ntau ua rau siv cov tub lim hlau thiab tag nrho lub cev} Lub cev siv anealing rau corrosion tsis kam.
Qhov ntau thiab tsawg:Muaj nyob rau hauv ntau ntawm sab nraud diameters (OD) thiab phab ntsa thicknesses (wt), teev tseg raws li ib leeg (piv txwv li, nps 2s / 80s / 80s / 80s / 80s / 80s / 80s).
Qhov kev sib xyaw ntawm cov zog siab thiab zoo dua corrosion tsis kam ua 22crule stainless hlau tus nqi ua tau zoo thiab txhim khu kev qha rau cov ntawv thov xav tau.
