904L vs 304L Stainless hlau - Dab tsi yog qhov txawv
904L vs 304L Stainless hlau - Dab tsi yog qhov txawv
Ob leeg 904L thiab 304L stainless hlau yog austenitic stainless hlau, tab sis 904L, vim nws cov nickel ntau dua, molybdenum, thiab tooj liab cov ntsiab lus, muaj superior corrosion kuj, ua rau nws zoo tagnrho rau corrosive heev corrosive ib puag ncig thiab seawater daim ntaub ntawv . 304L (ib tug general- lub hom phiaj yog tsis muaj cov ntsiab lus tsis muaj copper stainless hlau) tus nqi- ua tau zoo nyob rau hauv cov mob me me xws li kev ua zaub mov, tab sis nws muaj qhov tsis zoo rau cov tshuaj chloride corrosion. Qhov sib txawv tseem ceeb ntawm ob qhov lus dag hauv lawv cov muaj pes tsawg leeg (904L muaj ntau cov npib tsib xee, molybdenum, thiab tooj liab, thiab muaj cov ntsiab lus qis dua), uas muab 904L siab zog thiab zoo heev tiv thaiv pitting thiab crevice corrosion, thaum 304L paub txog nws cov nqi{10}}effectiveness thiab formability zoo.
Dab tsi yog "L" hauv 304L stainless hlau sawv rau?
Tsab ntawv L tom qab tus lej lej, xws li 304L, qhia tias cov ntsiab lus carbon tsuas yog qis dua 0.03% (qhov feem ntau cov pa roj carbon ntau yog 0.08%, thiab qee qib tuaj yeem muaj cov ntsiab lus siab tshaj plaws ntawm 0.15%).
Dab tsi yog 904L stainless hlau?
904L stainless hlau yog tsawg-carbon, tsis yog{2}}stabilized austenitic stainless hlau. Piv rau lwm cov hlau hauv kev ua lag luam, cov hlau no nthuav tawm zoo heev formability, weldability, thiab toughness. Vim nws cov ntsiab lus tsis tshua muaj carbon thiab siab nickel cov ntsiab lus, nws kuj muaj zog tiv thaiv corrosion thiab kev nyuaj siab corrosion cracking . 904L stainless hlau yog dav siv nyob rau hauv cov khoom siv tshuaj, khoom noj khoom haus, khoom siv kho mob, tshuaj cia tank, tshav kub exchangers, siab hlab ntsha, li qub, twj, thiab nuclear reactors.
Dab tsi yog 304L stainless hlau?
304L stainless hlau yog austenitic stainless hlau nrog hlau ua lub ntsiab alloying, muaj 18-20% chromium thiab 8-10% npib tsib xee. Piv nrog rau lwm cov hlau hauv kev ua lag luam, cov hlau no nthuav tawm zoo heev formability thiab weldability. Nws qhov kev tiv thaiv oxidation siab ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov ntawv thov uas oxidation yuav muaj teeb meem, xws li kev siv dej hiav txwv lossis chaw ua tshuaj lom neeg uas muaj chlorine lossis sulfur compounds tuaj yeem nyob hauv ib puag ncig. Tsis tas li ntawd, nws muaj cov tshuaj tiv thaiv zoo heev rau cov tshuaj chloride, ua rau nws zoo tagnrho rau cov khoom siv ua zaub mov lossis cov khoom siv kho mob uas nquag tuaj rau hauv kev sib cuag nrog cov dej ntsev los yog cov tshuaj brine.
Qhov sib txawv ntawm 904L thiab 304L stainless hlau:
904L yog kim dua 304L.
904L muaj corrosion kuj zoo dua li 304L.
904L muaj kev tiv thaiv zoo rau pitting thiab crevice corrosion tshaj 304L.
904L muaj weldability zoo dua 304L.
904L tsis tshua muaj kev ntxhov siab corrosion tawg dua 304L.
Tshuaj muaj pes tsawg leeg
| Qib | Chromium | Nickel | Cov pa roj carbon | Manganese | Phosphorus | Sulfer | Silicon | Nitrogen |
| 304L | 18.0-20.0 | 8.0 .-12.0 | 0.030 | 2.00 | 0.045 | 0.030 | 0.75 | 0.10 |
| Qib | Chromium | Nickel | Molybdenum | Silicon | Manganese | Phosphorus | Tooj | Sulfur |
| 904L | 19.00-23.00 | 23.00-28.00 | 4.0-5.0 | 1.00 | max 2.00 Nws | 0.045 max | 1.0-2.0 | 0.03 max |
Mechanical Properties
Qib | Tensile zog (MPa) min | Yield Strength 0.2% Pov thawj (MPa) min | Elongation (% hauv 50mm) min | Hardness | |
Rockwell IB (HR B) | Brinell (HB) | ||||
904L | 490 | 220 | 36 | 70-90 Nws | 150 |
| 304L | 485 | 170 | 40 | 92 | 201 |
Qhov txawv ntawm 304L thiab 904L Stainless Hlau
Corrosion Resistance:
304L: Haum rau cov huab cua puag ncig / kev siv zaub mov; susceptible rau corrosion los ntawm chlorides thiab muaj zog acids.
904L: Muaj kev tiv thaiv corrosion zoo heev rau corrosive media xws li sulfuric acid, phosphoric acid, thiab siab -chloride / dej hiav txwv ib puag ncig, tiv thaiv pitting thiab kev ntxhov siab corrosion tawg.
Daim ntawv thov:
304L: Chav ua noj, khoom noj khoom haus, kev tsim kho dav dav.
904L: Kev ua tshuaj lom neeg, cov khoom siv hluav taws xob, cov khoom siv tshuaj, cov tshuab dej hiav txwv, siab -chloride ib puag ncig.
Nqi thiab Machinability:
304L: Nqi - zoo thiab yooj yim rau tshuab.
904L: Tus nqi siab dua vim muaj cov ntsiab lus alloy ntau dua; nws cov ductility siab txhais tau tias ntau dua txiav quab yuam thiab cov cuab yeej hnav, tab sis nws muaj qhov zoo formability.
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