Chemical Composition Qhov txawv
Raws li cov lus sib xyaw tshuaj, qhov sib txawv tseem ceeb ntawm 304 thiab 316 stainless hlau tubing yog tias 316 muaj kwv yees li 2-3% molybdenum, thaum 304 tsis muaj.
| Lub ntsiab | Chromium | Nickel | Molybdenum | Cov pa roj carbon | Manganese | Silicon |
| 304 | 18.0 – 20.0 | 8.0 – 10.5 | 0 | Tsawg dua los yog sib npaug li 0.08 | Tsawg dua lossis sib npaug li 2.0 | Tsawg dua los yog sib npaug rau 1.0 |
| 316 | 16.0 – 18.0 | 10.0 – 14.0 | 2.0 – 3.0 | Tsawg dua los yog sib npaug li 0.08 | Tsawg dua lossis sib npaug li 2.0 | Tsawg dua los yog sib npaug rau 1.0 |
Kev sib piv tseem ceeb
Corrosion Resistance
- 304: Nws muaj kev tiv thaiv zoo heev rau huab cua hauv huab cua, dej tshiab, thiab qhov chaw corrosive. Nws tiv taus feem ntau cov organic thiab inorganic acids (xws li dilute sulfuric acid). Txawm li cas los xij, nws muaj peev xwm ua rau xeb hauv siab - ntsev, siab - chloride ib puag ncig (xws li ntawm ntug hiav txwv lossis hauv pas dej da dej).
- 316: Vim nws cov ntsiab lus molybdenum, nws muaj kev tiv thaiv corrosion zoo dua li 304, tshwj xeeb tshaj yog tiv thaiv pitting thiab crevice corrosion los ntawm chloride ions (Cl⁻). Nws yog tsim rau cov corrosive ib puag ncig xws li seawater thiab tshuaj industries.
Kub Kub Resistance
- 304: Qhov siab tshaj plaws ua haujlwm tsis tu ncua yog kwv yees li 800℃(1470℃F). Tshaj qhov kub no, cov oxide zaj duab xis yuav tsis ruaj khov, thiab flaking yuav tshwm sim nrog ntev - siv sijhawm. Creep kuj yog nruab nrab.
- 316: Vim tias molybdenum txhim kho oxidation thiab creep tsis kam ntawm qhov kub thiab txias, qhov siab tshaj plaws ua haujlwm kub yog kwv yees li 870℃(1600℃F). Nws ua tau zoo tshwj xeeb tshaj yog nyob rau hauv siab -kub cua uas muaj leej faj thiab chlorine.
Mechanical Properties
- 304 thiab 316 muaj lub zog tensile zoo sib xws thiab lub zog tawm los hauv lub xeev annealed.
- 316 yog me ntsis nyuaj dua 304, tab sis ob qho tib si tseem suav tias yog mos thiab tsim tau hauv lub xeev annealed.
Daim ntawv thov teb sib piv
| Hom ntawv thov | 304 | 316 |
| Kev siv txhua hnub | Cov khoom siv hauv tsev (dej, dab ntxuav tais diav), cov kav dej hauv tsev, cov khoom siv kho kom zoo nkauj, thiab lwm yam. | High -kawm sab nraum zoov cov khoom (xws li ntug hiav txwv railings), cov khoom siv dej hauv hiav txwv |
| Kev lag luam | General chemical pipelines, cov khoom siv kho dej tshiab, khoom noj khoom haus ua tshuab | Cov tshuaj corrosive siab heev, cov khoom siv seawater desalination, cov khoom siv tshuaj |
| Kev kho mob / Khoom noj khoom haus | Cov khoom noj khoom haus sib cuag (xws li lub tank cia) | High -cov cuab yeej kho mob muaj tseeb, cov cuab yeej cog tau, thiab qhov chaw ua zaub mov hnyav |
Xaus
Vim nws cov molybdenum thiab ntau dua nickel cov ntsiab lus, 316 yog kim dua 304. Kev xaiv yuav tsum yog raws li cov kev khiav hauj lwm tshwj xeeb (corrosion siv, kub, thiab nyiaj txiag). Yog tias qhov chaw ua haujlwm yog huab cua ib txwm, dej tshiab, lossis qis dua - cov xwm txheej corrosion, 304 yog tus nqi ntau dua - zoo. Yog tias ib puag ncig cuam tshuam nrog dej hiav txwv, cov ntsiab lus ntsev siab, tshuaj lom neeg corrosion, lossis siab - qhov kub thiab txias, 316 yog qhov kev xaiv zoo dua.