Kev sib piv ntawm 904L Thiab 316 Stainless Hlau: Ultra-High Corrosion-Resistant Vs Standard Corrosion-Resistant Austenitic Qib

904L thiab 316 yog ob qho tib si austenitic stainless hlau, nrog rau qhov sib txawv ntawm qhov tseem ceeb yog corrosion kuj theem (ultra- siab vs standard) txiav txim siab los ntawm alloying ntsiab (high nickel- tooj liab- molybdenum vs standard nickel- molybdenum). 904L yog haum rau qhov muaj zog acid hnyav ib puag ncig, thaum 316 haum rau nruab nrab corrosion ib puag ncig. Qhov kev sib piv no qhia meej txog kev xaiv qhov sib npaug ntawm cov kev xav tau ntawm corrosion thiab tus nqi.

Core Parameter Sib piv

Parameter	904L Stainless hlau	316 Stainless hlau
Chemical Composition (wt%)	C Less tshaj los yog sib npaug rau 0.02, 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=19.00-23.00, Ni=23.00-28.00, Mo=4.00-5.00, Cu{=1.00-2.00,	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 490MPa, Yield Strength Ntau dua lossis sib npaug rau 215MPa, Elongation Ntau dua lossis sib npaug li 35%, Hardness Tsawg dua lossis sib npaug rau 250HB	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℃rau 450℃(kev pabcuam txuas ntxiv)	-196℃txog 870℃(kev pabcuam txuas ntxiv)
Qib sib npaug	SUS904L (JIS), EN 1.4539, UNS N08904	SUS316 (JIS), EN 1.4401, UNS S31600

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv: 1. Corrosion resistance: 904L muaj npib tsib xee siab (23{9}}28%), molybdenum (4-}5%) thiab tooj liab (1-2%), PREN Ntau dua lossis sib npaug rau 32, zoo heev tiv thaiv cov acids muaj zog (sulfuric acid, phosphoric acid) thiab sib xyaw acids 316's PREN ≈25, haum rau nruab nrab corrosion ib puag ncig. 2. Siab- kev ua haujlwm kub: 316 qhov kev pabcuam kub (870 degree) yog 420℃siab dua 904L (450 degree), zoo dua kub kub oxidation tsis kam. 3. Tus nqi ntau dua: 2304L high-end corrosion-resistant Cov ntaub ntawv. 4. Formability: Ob leeg muaj qhov zoo formability, tab sis 904L cov ntsiab lus siab alloy nce deformation tsis kam, yuav tsum muaj zog stamping ntau dua . 5. Weldability: Ob leeg muaj weldability zoo, tab sis 904L yuav tsum nruj tswj ntawm cov cua sov input kom tsis txhob muaj kev sib txhuam.

Siv tau Scenario Distinction: 904L yog tsim rau muaj zog acid hnyav corrosion ib puag ncig, xws li sulfuric acid ntau lawm cov khoom (10-80% concentration), phosphoric acid cia tso tsheb hlau luam, tshuaj chiv nroj tsuag, thiab pickling khoom . 316 yog haum rau nruab nrab corrosion ib puag ncig, xws li tshuaj pipelines (tsis muaj zog acid / alkali), marine hardware, zaub mov ua machinery (dej kub exchangers).

Tswv yim Q&A

Q1: Vim li cas 904L haum rau sulfuric acid ib puag ncig? A1: Nws cov ntsiab lus siab nickel thiab tooj liab tuaj yeem tsim cov zaj duab xis passivation ruaj khov hauv sulfuric acid (concentration 10-80%, kub tsawg dua lossis sib npaug li 80 degree); tooj liab tuaj yeem txhawb kev tawg ntawm cov hlau ions, inhibiting cov tshuaj tiv thaiv anodic corrosion, uas 316 tsis tuaj yeem ua tiav.

Q2: Puas tuaj yeem 316 hloov 904L hauv qhov chaw tsis muaj zog acid? A2: Yog. Nyob rau hauv ib puag ncig acid tsis muaj zog (xws li 5% hydrochloric acid, chav tsev kub), 316 tuaj yeem ua tau raws li qhov yuav tsum tau muaj corrosion, thiab nws cov nqi qis dua 904L; 904L tsuas yog tsim nyog nyob rau hauv qhov chaw muaj zog acid.

Q3: Cov khoom siv vuam siv li cas rau 904L? A3: Siv ERNiCrMo-4 vuam hlau; tswj welding tshav kub input Tsawg dua los yog sib npaug rau 150J / mm kom tsis txhob overheating; post-weld passivation kev kho mob nrog nitric acid yuav tsum tau txhim kho corrosion kuj.

Q4: What is the service life difference between 904L and 316 in sulfuric acid environments? A4: In 50% sulfuric acid (60℃), 904L's service life is ≥10 years, while 316 will be severely corroded (corrosion rate >1mm / xyoo) thiab tsuas yog siv tau tsawg dua lossis sib npaug li 6 lub hlis.

Q5: Yuav ua li cas xaiv ntawm 904L thiab 316? A5: Xaiv 316 yog tias ib puag ncig yog qhov nruab nrab corrosion (tsis muaj zog acid / alkali, chloride) thiab tus nqi yog qhov kev txhawj xeeb; xaiv 904L tsuas yog tias muaj zog acid (sulfuric acid, phosphoric acid) hnyav corrosion kuj yuav tsum tau, tsis hais tus nqi.