TL;DR:Cov neeg yuav khoom hauv kev lag luam marine thiab chemicalstainless hlau kaujntsib qhov kev txiav txim siab rov ua dua: them tus nqi ntxiv 30–40% rau 316L lossis nyob nrog 304. Daim ntawv tshaj tawm no piv ob qib siv cov tshuaj tsuag ntsev nruab nrab (ASTM B117) thiab cov ntaub ntawv kuaj xeb los ntawm peb lub chaw soj nstuam ntawm Ningbo Stainless Steel, ntxiv rau cov ntaub ntawv xeb hauv thaj chaw los ntawm cov chaw tsim khoom ntug dej hiav txwv thiab tshuaj lom neeg. Lub moj khaum kev txiav txim siab tsom mus rau peb qhov sib txawv: chloride concentration, qhov kub ua haujlwm, thiab lub neej ua haujlwm xav tau.
Vim li cas qhov kev txiav txim siab 304 vs 316L tsis tuaj yeem ua rau tus nqi ib leeg
Hauv kuv lub luag haujlwm ua Tus Thawj Coj Kev Txawj Ntse ntawm Ningbo Stainless Steel, kuv tshuaj xyuas cov lus qhia ntawm cov khoom siv rau ntau pua tus neegtxias-kuav stainless hlau kaujkev txiav txim txhua xyoo. Lo lus nug 304 piv rau 316L yog qhov kev sib tham txog kev siv tshuab uas kuv muaj nrog cov neeg yuav khoom. Ib tug thawj coj kev yuav khoom rau lub tuam txhab tsim khoom siv hauv dej hiav txwv tau hais rau kuv tias, "Peb tau siv 304 rau kaum tsib xyoos. Nws ua haujlwm zoo - Kuv tsis pom vim li cas peb yuav tsum them ntxiv rau 316L." Rau lub hlis tom qab, nws lub tuam txhab yuav tsum tau hloov ib pawg ntawm 304 coil-formed Cheebtsam ntawm qhov project desalination ntug dej hiav txwv vim tias pitting corrosion tau tsim 0.3 hli tob qhov tom qab tsawg dua ob xyoos ntawm kev pabcuam. Qhov hloov pauv hauv 316L raug nqi ntau dua 40% upfront tab sis tsis tau qhia txog xoom pitting hauv peb xyoos ntawm kev ua haujlwm.
Qhov kev txiav txim siab ntawm 304 thiab 316L stainless hlau kauj tsis yog hais txog qib twg "zoo dua." Nws yog hais txog kev sib phim cov khoom siv tiv thaiv xeb rau qhov chaw pabcuam - thiab nkag siab tias koj xav tau lub sijhawm ntev npaum li cas rau kev teeb tsa ua ntej kev hloov pauv uas cuam tshuam nrog xeb yuav tsum tau ua. Qhov kev sib piv no muab cov ntsiab lus ntaub ntawv uas koj xav tau los txiav txim siab nrog koj lub qhov muag qhib.
Cov Tshuaj Lom Zem: Qhov Txawv ntawm Molybdenum
Qhov sib txawv tseem ceeb ntawm 304 thiab 316L yog qhov kev ntxiv 2.0–3.0% molybdenum rau hauv 316L. Molybdenum yog ib qho khoom siv ferrite-stabilizing uas txhim kho qhov kev tiv thaiv rau qhov xeb hauv zos - tshwj xeeb tshaj yog qhov xeb pitting thiab crevice hauv cov chaw muaj chloride.
| Khoom | 304 (UNS S30400) | 316L (UNS S31603) | Nws Cuam Tshuam Li Cas Rau Kev Ua Haujlwm |
|---|---|---|---|
| Chromium (Cr) | 18.0–20.0% | 16.0–18.0% | Kev tsim zaj duab xis tsis siv neeg - ob qib txaus |
| Nickel (Ni) | 8.0–10.5% | 10.0–14.0% | Austenite stabilization, formability |
| Molybdenum (Mo) | — | 2.0–3.0% | Qhov tseem ceeb ntawm lub qhov (earth resistance) - lub qhov (hole) |
| Cov pa roj carbon (C, siab tshaj) | 0.08% | 0.030% | Cov pa roj carbon tsawg dua hauv 316L txo qhov kev hnov mob thaum lub sijhawm vuam |
| PREN (Pitting Resistance Equivalent) | ~19 | ~24–26 | PREN = %Cr + 3.3 ×%Mo + 16 ×%N; siab dua = zoo dua |
Tus nqi PREN yog tus lej sib txawv ib leeg. PREN ntawm 19 txhais tau tias 304 yog qhov tsim nyog rau cov chaw uas muaj cov chloride concentration txog li 200 ppm ntawm qhov kub thiab txias. 316L nrog PREN ntawm 24–26 txuas ntxiv qhov txwv ntawd mus txog li 1,000 ppm chlorides. Tus lej no txiav txim siab qhov twg txhua qib tuaj yeem siv yam tsis muaj kev xeb sai hauv zos.
Kev Ntsuas Tshuaj Tsuag Ntshav Tsis Muaj Qhov Ntsuas (ASTM B117) - Kev Sib Piv Hauv Chaw Kuaj Mob
Peb lub chaw kuaj mob tau ua qhov kev sim tshuaj tsuag ntsev tsis muaj zog li 1,000 teev raws li ASTM B117 rau ntawm 304 thiab 316L cov qauv kauj txias (2B tiav, tuab 1.0 hli). Cov kev ntsuas kev sim: 5% NaCl kua, 35 ° C chav kub, tsuag tas mus li. Cov txiaj ntsig tau raug soj ntsuam ntawm 100 teev.
| Lub sij hawm nphav raug | 304 — Kev Soj Ntsuam Kev Xeb | 316L — Kev Soj Ntsuam Kev Xeb |
|---|---|---|
| 100 teev | Cov xim me me ntawm ntug | Tsis pom kev hloov pauv |
| 300 teev | 5–8% thaj chaw nrog cov xim xeb me me | Tsis pom kev hloov pauv |
| 500 teev | 15–20% thaj chaw xeb, pom cov xim av | Tsuas yog muaj cov xim pleev xim ntawm cov npoo txiav xwb |
| 750 teev | 40%+ xeb ntawm qhov chaw, qee qhov ua qhov | Pom tsuas yog ntawm ntug, tsawg dua 1% thaj chaw |
| 1,000 teev | >60% xeb ntawm qhov chaw, 0.05–0.15 hli qhov tob | Kev pleev xim rau ntug, tsis muaj qhov rau ntawm cov chaw tiaj tiaj |
Hauv qhov chaw tswj hwm ntsev tsuag, 304 tau qhia txog kev pib xeb zoo sib xws tom qab 300 teev thiab qhov ntsuas tau tom qab 750 teev. 316L tau dim 1,000 teev nrog tsuas yog xim ntug - tsis muaj qhov pitting ntawm qhov chaw tiaj tus. Lub sijhawm "pitting pib" rau 304 yog kwv yees li 300 teev piv rau >1,000 teev rau 316L - ntau dua 3 × kev txhim kho.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias ASTM B117 tshuaj tsuag ntsev yog kev sim sib piv, tsis yog kev kwv yees lub neej ua haujlwm. Cov xwm txheej ceev ceev tsim cov txiaj ntsig uas cuam tshuam nrog - tab sis tsis txhais ncaj qha rau - kev ua haujlwm hauv thaj teb. Txawm li cas los xij, qhov sib txawv ntawm ob qib yog qhov ntseeg tau.
Kev Ntsuas Kev Sib Tsoo Cyclic - Ua Piv Txwv Cov Chaw Nyob Ntug Dej Hiav Txwv thiab Kev Lag Luam
Yuav kom sawv cev tau zoo dua qhov kev raug mob hauv ntiaj teb tiag tiag, peb tau khiav qhov kev sim xeb ib puag ncig (hloov kho ASTM G85-A5, 24-teev voj voog: 2 teev ntsev tsuag + 22 teev 95% RH ntawm 35 ° C) dhau 500 voj voog ntawm ob qib nrog rau qhov xwm txheej milled-edge simulating coil-processed qhov chaw. Cov txiaj ntsig yog siv tau ncaj qha rau cov chaw ua haujlwm hauv dej hiav txwv thiab tshuaj lom neeg:
- 304 kauj:Pib ua qhov pitting ntawm 120 lub voj voog, sib sau ua ke ntawm cov npoo txiav. Qhov nruab nrab ntawm kev loj hlob ntawm qhov av yog 0.008 hli ib lub voj voog ntawm 120–300 lub voj voog, qeeb qeeb mus rau 0.003 hli ib lub voj voog tom qab 300 lub voj voog (txwv los ntawm anodic polarization). Tom qab 500 lub voj voog, qhov tob tshaj plaws ntawm qhov av yog 0.28 hli, nrog rau 15–20 qhov av ib 100 cm² tshaj qhov tob 0.1 hli.
- 316L kauj:Thawj qhov pib ntawm 380 lub voj voog - kuj tseem nyob ntawm cov npoo txiav tab sis tsis yog ntawm qhov chaw tiaj tiaj. Qhov nruab nrab ntawm kev loj hlob ntawm qhov av yog 0.002 hli ib lub voj voog. Tom qab 500 lub voj voog, qhov tob tshaj plaws ntawm qhov av yog 0.06 hli, nrog tsawg dua 3 qhov av ib 100 cm² tshaj qhov tob 0.05 hli.
Cov ntaub ntawv kuaj xyuas ib puag ncig lees paub tias qhov sib txawv tseem ceeb ntawm 304 thiab 316L yog lub sijhawm pib pitting. 316L ncua qhov pib ntawm pitting los ntawm kwv yees li 3 × piv rau 304. Rau kev teeb tsa hauv hiav txwv uas xav tias yuav kav ntev 10 xyoo, 304 yuav pib qhia xeb ntawm cov npoo txiav hauv 2-3 xyoos, thaum 316L yuav tseem tsis cuam tshuam rau 8-10 xyoo ua ntej qhov me me ntawm ntug pitting pom.
Cov kev tshawb pom no sib haum nrog cov kev tshawb fawb hauv thaj teb uas tau tshaj tawm txog kev xeb ntawm cov hlau tsis xeb hauv cov chaw ua haujlwm thiab dej hiav txwv. Kev tshawb fawb ywj pheej piv rau 304 thiab 316L raug rau cov xwm txheej sib xyaw ua ke ntawm kev lag luam-dej hiav txwv-hauv nroog lees paub tias 316L ua pov thawjzoo dua qhov tsis kam rau pitting hauv chloride ib puag ncig vim nws cov ntsiab lus molybdenumRau cov neeg yuav khoom uas tsis tuaj yeem khiav lawv tus kheej cov kev ntsuam xyuas xeb cyclic, cov kev sib piv luam tawm no los ntawm kev lag luam hlau muab cov ntaub ntawv siv tau zoo.
Tsis tas li ntawd xwb, qhov cuam tshuam ntawm ntug txiav uas pom hauv peb qhov kev sim - qhov twg qhov pib pib feem ntau ntawm cov npoo milled lossis sheared - muaj cov txiaj ntsig zoo rau cov neeg yuav khoom coil. Coil uas raug txiav kom dav hauv qhov chaw faib khoom tsim cov npoo txiav tshiab ntawm ob sab ntawm txhua daim kab xev. Cov npoo no tsis muaj zaj duab xis tiv thaiv chromium oxide passive uas muaj nyob rau ntawm qhov chaw dov ntawm lub coil thiab yog li ntawd sawv cev rau qhov tsis muaj zog tshaj plaws hauv cov saw hlau xeb. Thaum teev cov coil rau kev siv hauv dej hiav txwv lossis tshuaj lom neeg, kuv xav kom thov kom muaj xwm txheej ntawm ntug zeb (qhov twg ua tau) lossis teev cov kev kho mob ntug passivation - nitric acid lossis citric acid passivation ib ASTM A967 - ua kauj ruam tom qab shearing.
Pitting Potential — Kev Ntsuas Hluav Taws Xob
Peb lub chaw kuaj mob tau ua qhov kev ntsuas polarization potentiodynamic (ASTM G61) ntawm ob qib hauv 3.5% NaCl kua (kwv yees li ntawm dej hiav txwv salinity) ntawm 25 ° C thiab 50 ° C. Lub peev xwm pitting (Epit) yog lub zog uas cov zaj duab xis passive tawg thiab kev loj hlob ntawm qhov chaw ruaj khov pib - cov nqi siab dua qhia txog kev tiv thaiv zoo dua.
| Cov Qauv | 304 hauv 3.5% NaCl | 316L hauv 3.5% NaCl |
|---|---|---|
| Kub ntawm 25 ° C | +0.28 V (piv rau SCE) | +0.45 V (piv rau SCE) |
| Kub ntawm 50 ° C | +0.12 V (piv rau SCE) | +0.33 V (piv rau SCE) |
| Qhov kub tseem ceeb ntawm qhov pitting (CPT) | ~35°C | ~55°C |
| Qhov ceev tam sim no tsis tu ncua | 0.8 µA/cm² | 0.4 µA/cm² |
Qhov kub thiab txias tseem ceeb (CPT) yog qhov ntsuas tau zoo: qis dua qhov kub thiab txias no, zaj duab xis passive tseem ruaj khov txawm tias nyob hauv ib puag ncig chloride. Saum toj no nws, pitting pib spontaneously. 304 muaj CPT ntawm kwv yees li 35 ° C hauv dej hiav txwv - txhais tau tias nws muaj kev pheej hmoo hauv txhua daim ntawv thov marine qhov twg cov khoom nto tshaj 35 ° C (ntug dej hiav txwv ncaj qha rau ntawm cov ntu nyias nyias, piv txwv li). 316L nrog CPT ntawm 55 ° C npog yuav luag txhua daim ntawv thov marine-kub ambient yam tsis muaj kev pheej hmoo pitting.
Cov Khoom Siv Kho Tshuab - Lub Zog Tensile thiab Kev Tsim Kho
Ob qho tib si 304 thiab 316L muaj nyob rau hauv tib qib temper (annealed los ntawm tag nrho cov tawv), thiab qhov sib txawv ntawm cov khoom siv kho tshuab yog me me. PebCov khoom siv coil tshwj xeebsuav nrog ob qib hauv cov tuab ntawm 0.3 hli txog 4.0 hli, nrog rau 2B, BA, No. 4, thiab HL qhov chaw tiav muaj. Rau cov tempers zoo sib xws hauv daim ntawv txias-rolled coil:
| Vaj tse | 304 (Annealed) | 316L (Kub hnyiab) |
|---|---|---|
| Lub zog tensile (MPa) | 515–690 | 485–690 |
| Lub zog tawm los 0.2% (MPa) | 205–345 | 170–345 |
| Kev ntev% | 40–60% | 40–60% |
| Qhov nyuaj (HRB) | 82–92 | 79–92 |
| Modulus ntawm elasticity (GPa) | 193 | 193 |
316L muaj zog qis dua me ntsis hauv qhov xwm txheej annealed vim yog cov pa roj carbon tsawg dua, tab sis qhov sib txawv tsis tseem ceeb hauv kev ua cov kauj vuam. Ob qib tsim, khoov, stamp, thiab weld zoo sib xws. Kev txiav txim siab txog kev kho tshuab ntawm lawv yeej tsis yog qhov tsav tsheb - qhov chaw xeb txiav txim siab qhov kev xaiv. Rau cov ntawv thov uas xav tau cov qib kub tshwj xeeb hauv daim ntawv kauj vuam, ob qho tib si 304 thiab 316L muaj nyob rau hauv cov kub zoo sib xws - annealed, 1 / 4H, 1 / 2H, thiab tag nrho tawv - los ntawm peb cov kab ntau lawm. Yog li ntawd, tus neeg yuav khoom xaiv ntawm ob qib tuaj yeem teev tib lub kub rau ob qho khoom siv yam tsis muaj kev txhawj xeeb txog cov khoom siv kho tshuab.
Cov qauv kev lag luam xws liqhov sib piv 304 vs 316 los ntawm cov chaw pabcuam hlau lojqhia txog tib qho xaus lus: thaum daim ntawv thov cuam tshuam nrog dej ntsev, kev ua tshuaj lom neeg, lossis kev raug dej hiav txwv sab nraum zoov, 316L yog qhov tsim nyog txawm tias nws cov nqi siab dua.
Kev Tshawb Fawb Txog Tus Nqi Sib Txawv - Puas Yog 316L Premium Tsim Nyog?
Tus nqi sib txawv ntawm 304 thiab 316L txias-kuav kauj hloov pauv nrog nickel thiab molybdenum nqi. Txij li nruab nrab-2026, raws li FOB Ningbo tus nqi rau Qib 304 thiab 316L hauv 2B tiav, 1.0–3.0 hli tuab, hauv qhov dav ntawm kauj txheem:
- 304 kauj (2B, dov txias):$2,800–$3,200 ib metric tonne
- 316L kauj (2B, txias dov):$3,800–$4,400 ib metric tonne
- Qib Siab:35–40% dhau 304
Tus nqi them no yuav tsum tau soj ntsuam nrog tus nqi ntawm kev hloov pauv uas cuam tshuam nrog xeb. Raws li peb cov kev sib tham nrog cov neeg siv khoom hauv kev lag luam marine thiab tshuaj lom neeg, ib qho kev hloov pauv uas tsav los ntawm xeb suav nrog:
- Tus nqi khoom siv:Cov kauj hloov pauv ntawm tus nqi lag luam tam sim no (feem ntau siab dua 15–25% piv rau qhov yuav thawj zaug vim yog lub sijhawm ua khoom xa tuaj)
- Tus nqi tsim khoom:Kev txiav, kev tsim, kev vuam, thiab kev ua tiav ntawm qhov chaw ntawm cov khoom hloov pauv - feem ntau yog 50–100% ntawm tus nqi tsim khoom thawj zaug
- Lub sijhawm teeb tsa tsis ua haujlwm:Rau cov kav dej tshuaj lom neeg lossis cov khoom siv hauv dej hiav txwv, lub sijhawm tsim khoom tsis ua haujlwm thaum lub sijhawm hloov pauv yog qhov khoom kim tshaj plaws - feem ntau 2–5 × tus nqi khoom siv thiab kev tsim khoom ua ke.
- Kev pheej hmoo ntawm kev lav phib xaub:Lub luag haujlwm txuas ntxiv yog tias xeb ua rau tsis ua haujlwm ua ntej lub sijhawm hauv kev teeb tsa ntawm cov neeg siv khoom
Kev xam tus nqi yooj yim rau lub neej voj voog rau cov khoom siv hauv dej hiav txwv: 5 tons ntawm 2.0 hli 304 kauj raug nqi $ 15,000. Lub neej xav tau hauv ib puag ncig ntug dej hiav txwv: 4-6 xyoo ua ntej pom qhov pitting xav tau hloov. 316L kauj rau tib daim ntawv thov raug nqi $ 21,000 (tus nqi 40%). Lub neej xav tau ua ntej pitting: 12-15 xyoo. Tshaj li 15-xyoo, qhov kev xaiv 304 xav tau 2-3 qhov hloov pauv, tag nrho $ 30,000- $ 45,000 hauv cov nqi khoom siv ntxiv rau kev ua haujlwm teeb tsa. Qhov kev xaiv 316L xav tau ib qho kev yuav khoom ntawm $ 21,000 thiab xoom hloov pauv. Ntawm 10+ xyoo kev pabcuam xav tau, 316L yog qhov pheej yig dua.
Kev Txiav Txim Siab: Thaum Twg Yuav Tsum Qhia 304 vs 316L Coil
| Ib puag ncig kev pabcuam | Qib Chloride | Kub | Lub Neej Pabcuam | Cov Lus Pom Zoo |
|---|---|---|---|---|
| Kev tsim vaj tsev sab hauv tsev, HVAC | < 50 ppm | < 35°C | 10–20 xyoo | 304 - txaus |
| Sab nraum zoov ntawm lub tsev ntug dej hiav txwv | 100–500 ppm | < 35°C | 5–10 xyoo | 304 (txais tau), 316L (nyiam dua) |
| Cov qauv dej hiav txwv (nthuav dej ntsev ncaj qha) | > 1,000 ppm | < 40°C | 10+ xyoo | 316L - yuav tsum muaj |
| Cov nroj tsuag tshuaj lom neeg, tsis muaj chloride | < 50 ppm | < 100°C | 5–15 xyoos | 304 - txaus |
| Hoobkas tshuaj lom neeg, cov txheej txheem chloride | 500–5,000 ppm | 30–80°C | 5+ xyoo | 316L - yuav tsum muaj |
| Kev ua zaub mov, thaj chaw ntxuav | < 200 ppm | < 50°C | 5–10 xyoo | 304 - txaus |
| Offshore platform, cov khoom siv sab saum toj | > 10,000 ppm | Ib puag ncig | 15+ xyoo | 316L - yuav tsum muaj; xav txog duplex rau qhov kub heev |
Xaus lus
Qhov kev xaiv ntawm 304 thiab 316L stainless hlau kauj rau kev siv hauv marine thiab tshuaj lom neeg yog txhais los ntawm peb qhov sib txawv: chloride concentration, kub ua haujlwm piv rau CPT, thiab lub neej ua haujlwm xav tau. 304 yog txaus rau sab hauv tsev, qis-chloride, thiab nruab nrab-kub ib puag ncig uas hloov tau hauv 5-8 xyoo. 316L yog qhov yuav tsum tau rau txhua daim ntawv thov uas cuam tshuam nrog kev raug dej ntsev ncaj qha, cov txheej txheem chloride ntws siab dua 200 ppm ntawm qhov kub siab, lossis kev ua haujlwm xav tau ntau dua 10 xyoo hauv cov chaw ntug dej hiav txwv. Tus nqi them ntxiv ntawm 35-40% rau 316L tau rov qab los hauv thawj lub voj voog hloov pauv zam. NtawmNingbo Stainless Hlau, peb muab ob qib nrog kev taug qab tag nrho ntawm lub zeb, daim ntawv pov thawj tshuaj lom neeg thiab tshuab, thiab cov ntaub ntawv kuaj xeb thaum thov. Rau tus nqi tam sim no thiab muaj khoom lag luam ntawm304 thiab 316L stainless hlau kauj, tiv tauj peb pab neeg muag khoom nrog koj qhov dav, tuab, thiab qhov chaw tiav.
Cov Lus Nug Feem Ntau
Qhov txawv tseem ceeb ntawm 304 thiab 316L stainless hlau kauj yog dab tsi?
316L muaj 2.0–3.0% molybdenum, uas 304 tsis muaj. Molybdenum txhim kho qhov tiv taus rau qhov xeb pitting thiab crevice hauv cov chaw chloride. Qhov no muab 316L PREN (Pitting Resistance Equivalent Number) ntawm ~ 24–26 piv rau ~ 19 rau 304.
316L raug nqi ntau npaum li cas piv rau 304?
Txij li nruab nrab xyoo 2026, 316L cov hlau txias dov muaj tus nqi siab dua 35–40% piv rau 304 hauv kev lag luam xa khoom hauv Suav teb. Qhov sib txawv tseeb hloov pauv nrog tus nqi khoom nickel thiab molybdenum. Rau lub hom phiaj kev npaj nyiaj txiag, cia siab tias $ 3,800–$ 4,400 ib metric ton rau 316L piv rau $ 2,800–$ 3,200 rau 304.
Puas yog 316L tuaj yeem vuam tau tib yam li 304?
Yog — ob qib yog cov hlau tsis xeb austenitic uas muaj kev sib txuas zoo heev siv TIG, MIG, lossis cov txheej txheem vuam tsis kam. 316L cov pa roj carbon tsawg dua (0.030% max) muab qhov zoo dua: nws tiv taus kev hloov pauv (chromium carbide precipitation ntawm cov ciam teb ntawm cov noob) hauv thaj chaw kub-cuam tshuam thaum lub sijhawm vuam, uas txhais tau tias nws tswj tau qhov kev tiv thaiv corrosion tom qab vuam yam tsis tas yuav tsum tau annealing tom qab-weld kua.
Puas yog 316L yeej ib txwm zoo dua li 304 rau kev siv hauv dej hiav txwv?
Yog, rau txhua yam khoom siv lossis khoom thauj uas sib chwv ncaj qha nrog dej hiav txwv lossis dej hiav txwv tsuag. 304 nyob rau hauv ib puag ncig dej hiav txwv yuav pib pitting hauv 2-4 xyoos ntawm cov npoo txiav thiab thaj chaw vuam. 316L txuas ntxiv pitting pib mus rau 8-12 xyoos. Rau cov ntawv thov saum toj no thaj chaw splash (piv txwv li, 50+ meters hauv av ntawm ntug dej hiav txwv), 304 tuaj yeem txaus yog tias qhov chaw tuaj yeem tswj hwm thiab tshuaj xyuas tsis tu ncua.
Puas yog qhov ua tiav ntawm qhov chaw cuam tshuam rau kev tiv thaiv corrosion ntawm 304 vs 316L kauj?
Yog - qhov chaw du dua (2B, No. 4, lossis BA) muab kev tiv thaiv xeb zoo dua li qhov chaw ntxhib (No. 1 kub-dov, lossis pickled) vim tias muaj tsawg dua qhov chaw nucleation rau qhov pib qhov. Txawm li cas los xij, qhov sib txawv ntawm 304 thiab 316L tseem zoo li qub tsis hais qhov tiav: 316L ntawm 2B tiav tseem ua tau zoo dua 304 ntawm 2B tiav los ntawm tib qhov npoo.
Qhov kub tseem ceeb ntawm 304 vs 316L yog dab tsi?
Hauv cov kua NaCl 3.5% (ua piv txwv rau dej hiav txwv), 304 muaj qhov kub thiab txias tseem ceeb (CPT) kwv yees li 35 ° C, thaum 316L muaj CPT kwv yees li 55 ° C. Qhov no txhais tau tias 316L tuaj yeem siv tau zoo hauv dej hiav txwv ntawm qhov kub txog li 55 ° C ua ntej qhov pib ntawm qhov pib, thaum 304 twb nkag mus rau thaj chaw muaj kev pheej hmoo ntawm qhov siab tshaj 35 ° C.
Kuv puas siv tau 304 kauj rau kev siv tshuaj lom neeg?
Yog - tab sis tsuas yog nyob rau hauv cov chaw tsis muaj chloride xwb. 304 yog siv dav hauv cov kav dej tshuaj lom neeg, cov hlab dej, thiab cov khoom siv rau sulfuric acid (txog li 50%), nitric acid, thiab cov tshuaj organic. Rau txhua txoj kev ua haujlwm uas muaj chlorides - txawm tias cov nyiaj me me saum toj no 50 ppm - 316L yog qhov tsawg kawg nkaus.
Sau los ntawm Mr. Chen — Tus Thawj Coj Kev Txawj Ntse ntawm Ningbo Stainless Steel Co., Ltd. Tshwj xeeb hauv kev xaiv cov khoom siv hlau tsis xeb, daim ntawv thov dov txias, thiab kev daws teeb meem kev xa khoom hauv kev lag luam. Txuas:Instagram | Facebook
Lub sijhawm tshaj tawm: Lub Xya Hli-15-2026
