Kev sib piv ntawm SUS321 Thiab SUS347: Titanium-Stabilized Vs Niobium-Stabilized Austenitic Stainless Hlau

SUS321 thiab SUS347 yog cov stabilized austenitic stainless hlau, nrog rau qhov sib txawv tseem ceeb yog lub stabilizing lub ntsiab (SUS321: Ti=4 × C-0.70%; SUS347: Nb + Ta=8 × C-1.00%). Titanium thiab niobium ob leeg tiv thaiv intergranular corrosion, tab sis niobium-stabilized SUS347 muaj kev ruaj ntseg kub zoo dua, ua rau lawv tsim nyog rau cov xwm txheej kub kub sib txawv.

Core Parameter Sib piv

Parameter	SUS321 Stainless hlau	SUS347 Stainless hlau
Chemical Composition (wt%)	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 zos rau 0.045, S Less tshaj los yog sib npaug rau 0.030, Cr=17.00-19.00, Ni=9.00-12.00, Ti{=4 × Ba} {Lance 0.70,	C Less tshaj los yog sib npaug rau 0.08, Si Less tshaj los yog sib npaug zos 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=17.00-19.00, Ni=9.00-13.00, Nb+Ta{{{8}1} × C-Ba} {0.
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, 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
Kev Pabcuam Kub	-196℃txog 870℃(kev pabcuam txuas ntxiv)	-196℃txog 900℃(kev pabcuam txuas ntxiv)
Qib sib npaug	EN 1.4541, UNS S32100, AISI 321	EN 1.4550, UNS S34700, AISI 347

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv: 1. High -kub stability: SUS347's niobium carbides (NbC) ruaj khov dua SUS321's titanium carbides (TiC) ntawm qhov kub thiab txias, tsis yooj yim rau decompose saum 800 degree; SUS321's TiC decomposes me ntsis ntawm 850℃. 2. Intergranular corrosion kuj: Ob leeg muaj zoo heev intergranular corrosion kuj tom qab vuam; SUS347 yog qhov ruaj khov dua nyob rau hauv ntev -lub sij hawm siab-kev pabcuam kub. 3. Weldability: Ob leeg muaj weldability zoo, tsis muaj ncej-weld cua sov yuav tsum tau kho; SUS347 tau zoo dua vuam tawg ua haujlwm. 4. Machinability: SUS321 muaj me ntsis machinability zoo dua SUS347; SUS347's niobium cov ntsiab lus nce kev txiav tsis kam. 5. Tus nqi: SUS347 yog 15-20% kim dua SUS321.

Siv tau Scenario Distinction: SUS321 yog qhov tsim nyog rau qhov dav dav dav - qhov kub ntawm cov khoom siv vuam, xws li aero- lub cav tso cov kav dej, boiler cua kub exchanger tubes (tsawg dua lossis sib npaug li 870 degree), thiab cov hlab ntsha tshuaj lom neeg. SUS347 yog tsim rau ntev -lub sij hawm siab- qhov kub thiab txias kev pab cuam Cheebtsam, xws li nuclear fais fab nroj tsuag chav generators, siab - kub boiler superheater raj (800-900 degree), thiab aerospace structural Cheebtsam.

Tswv yim Q&A

Q1: Dab tsi yog qhov txawv ntawm titanium thiab niobium stabilization mechanisms? A1: Ob leeg nyiam ua ke nrog cov pa roj carbon monoxide kom tsis txhob Cr₂₃C₆ nag lossis daus; TiC muaj qhov tsis zoo - qhov kub thiab txias, thaum NbC muaj siab dua - qhov kub thiab txias, ua rau SUS347 zoo dua rau ntev - lub sij hawm siab - qhov kub thiab txias. Q2: Puas tuaj yeem SUS321 hloov SUS347 hauv kev siv hluav taws xob nuclear? A2: Tsis yog. Nuclear fais fab nroj tsuag chav generators yuav tsum tau ntev -lub sij hawm kev pab cuam ntawm 850-900℃; SUS321's TiC yog nquag decomposition, txo corrosion kuj, thaum SUS347's NbC tseem ruaj khov. Q3: Cov khoom siv vuam siv li cas rau SUS321 thiab SUS347? A3: SUS321 siv ER321 vuam hlau; SUS347 siv ER347 vuam hlau; ob qho tib si yuav tsum tau tswj cov khoom siv hluav taws xob tsawg dua lossis sib npaug ntawm 180J / mm kom tsis txhob muaj cua sov. Q4: Dab tsi yog qhov kev pab cuam lub neej txawv ntawm SUS321 thiab SUS347 ntawm 850 degree? A4: SUS347 lub neej kev pabcuam (Ntau dua lossis sib npaug li 15 xyoos) ntev dua SUS321 (Ntau dua lossis sib npaug rau 10 xyoo); SUS321's grain ciam teb yog yooj yim rau corrosion me ntsis tom qab ntev -lub sij hawm siab- kub kev pab cuam. Q5: Yuav ua li cas xaiv ntawm SUS321 thiab SUS347? A5: Xaiv SUS321 yog tias tus nqi muaj kev txhawj xeeb thiab kev pabcuam kub tsawg dua lossis sib npaug li 850 degree; xaiv SUS347 yog tias qhov kev pabcuam ntev ntev ntawm 850-900℃yog qhov yuav tsum tau thiab qhov kub thiab txias yog qhov tseem ceeb.