Kev sib piv ntawm SUS304 Thiab SUS316: General-Lub Hom Phiaj Vs Molybdenum- Muaj Corrosion-Resistant Austenitic Stainless Hlau

SUS304 thiab SUS316 yog tus sawv cev dav dav -lub hom phiaj thiab molybdenum- muaj cov austenitic stainless hlau, nrog rau qhov sib txawv tseem ceeb yog qhov sib ntxiv ntawm molybdenum (2.00-3.00%) hauv SUS316 thiab cov ntsiab lus ntau dua nickel. Molybdenum ho txhim kho pitting thiab crevice corrosion kuj nyob rau hauv chloride ib puag ncig, ua rau lawv haum rau txawv corrosion ib puag ncig theem.

Core Parameter Sib piv

Parameter	SUS304 Stainless hlau	SUS316 Stainless hlau
Chemical Composition (wt%)	C Tsawg dua lossis sib npaug 0.08, Si Less dua lossis sib npaug rau 1.00, Mn Tsawg dua lossis sib npaug 2.00, P Tsawg dua lossis sib npaug 0.045, S Less dua lossis sib npaug 0.030, Cr=18.00-20.00, Ni=8.00-10.50, Fe=Sib npaug	C Less tshaj los yog sib npaug rau 0.08, Si Less tshaj los yog sib npaug rau 1.00, Mn Less tshaj los yog sib npaug rau 2.00, P Less tshaj los yog sib npaug rau 0.045, S Less tshaj los yog sib npaug rau 0.030, Cr=16.00-18.00, Ni=10.00-14.00, Mo=2.00-3.00, Fe=
Mechanical Properties (Annealed)	Tensile Strength Ntau dua los yog sib npaug rau 515MPa, Tawm Zog Ntau dua lossis sib npaug ntawm 205MPa, Elongation Ntau dua lossis sib npaug li 40%, Hardness Tsawg dua lossis sib npaug rau 201HB	Tensile Strength Ntau dua los yog sib npaug rau 515MPa, Yield Strength Ntau dua lossis sib npaug rau 205MPa, Elongation Ntau dua lossis sib npaug li 40%, Hardness Tsawg dua lossis sib npaug rau 217HB
Kev Pabcuam Kub	-196℃txog 870℃(kev pabcuam txuas ntxiv)	-196℃txog 870℃(kev pabcuam txuas ntxiv)
Qib sib npaug	EN 1.4301, UNS S30400, AISI 304	EN 1.4401, UNS S31600, AISI 316

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv: 1. Corrosion resistance: SUS316's molybdenum ntxiv txhim khu kev tiv thaiv rau pitting, crevice corrosion thiab chloride corrosion (pitting kuj sib npaug PREN≈25), thaum SUS304's PREN≈18, tsis zoo nyob rau hauv chloride ib puag ncig. 2. Tsawg- ob qho tib si qhov kub thiab txias: SUS316 cov ntsiab lus ntau dua nickel txhim kho qis-kub toughness me ntsis. 3. Siab- kev ua haujlwm kub: SUS316's molybdenum ntxiv txhim kho siab-kub oxidation kuj nyob rau hauv cov huab cua corrosive, zoo dua rau high-temperature corrosive: 15} ib puag ncig corrosive{6} 30-40% kim dua SUS304. 5. Formability: Ob leeg muaj formability zoo heev, tab sis SUS316 cov ntsiab lus siab dua cov alloy ua rau deformation kuj me ntsis.

Siv tau Scenario Distinction: SUS304 yog qhov tsim nyog rau qhov chaw qis qis, xws li cov kav dej tshiab, cov khoom siv hauv tsev, cov khoom siv ua zaub mov (qhuav lossis qis- ntsev), thiab cov khoom siv kho mob. SUS316 yog qhov tsim nyog rau nruab nrab- ib puag ncig corrosion, xws li marine hardware, khoom siv tshuaj (tsis muaj zog acid/alkali), seawater pipelines, thiab cov khoom noj khoom haus (saline zaub mov).

Tswv yim Q&A

Q1: Vim li cas SUS316 tsim nyog rau thaj chaw ntug dej hiav txwv tshaj SUS304? A1: Ntug hiav txwv atmospheric ib puag ncig muaj chloride ions siab; SUS316's molybdenum tsim cov yeeb yaj kiab ruaj khov dua, uas tuaj yeem tiv taus cov tshuaj chloride ion yaig, nrog lub neej ua haujlwm ntawm 5-8 xyoo; SUS304 yuav xeb tsis pub dhau 1-2 xyoos nyob rau hauv ntug dej hiav txwv.

Q2: Puas tuaj yeem SUS304 hloov SUS316 hauv kev ua zaub mov? A2: Tsuas yog tsim nyog rau qhuav lossis qis -kev ua zaub mov ntsev (xws li hmoov nplej, nplej); tsis haum rau cov khoom noj ntsev los yog acidic (xws li cov nqaij nruab deg, pickles) ua, vim nws yooj yim rau xeb thiab paug cov zaub mov; SUS316 yog cov khoom siv rau corrosive food contact scenarios.

Q3: Qhov txawv ntawm cov khoom siv vuam ntawm SUS304 thiab SUS316 yog dab tsi? A3: SUS304 siv ER308L vuam hlau, thaum SUS316 siv ER316L vuam hlau; tom kawg muaj cov ntsiab lus molybdenum los xyuas kom meej corrosion tsis kam ntawm weld cheeb tsam.

Q4: What is the corrosion rate difference between SUS304 and SUS316 in seawater? A4: In static seawater, SUS304's corrosion rate is >0.5mm / xyoo, thaum SUS316 tus nqi corrosion yog<0.1mm/year, which can meet long-term service requirements in seawater environments.

Q5: Yuav ua li cas xaiv ntawm SUS304 thiab SUS316? A5: Xaiv SUS304 yog tias tus nqi yog qhov tseem ceeb thiab ib puag ncig tsawg - corrosion (qhuav, dej tshiab); xaiv SUS316 yog tias xav tau chloride corrosion kuj, txawm tias tus nqi siab dua.