Kev sib piv ntawm SUS304 Thiab SUS304H: General-Lub Hom Phiaj Vs Siab-Carbon Siab-Tub kub Austenitic Stainless Hlau

SUS304 thiab SUS304H yog nyob rau hauv 304 series, nrog rau qhov sib txawv tseem ceeb yog cov ntsiab lus carbon (SUS304: C Tsawg dua lossis sib npaug li 0.08%, SUS304H: C=0.04-0.10%). Kev tswj hwm cov ntsiab lus siab ntawm SUS304H txhim kho nws qhov siab -kub creep zog thiab cov qauv kev ruaj ntseg, ua rau lawv haum rau qhov sib txawv ntawm qhov kub thiab txias kev pabcuam.

Core Parameter Sib piv

Parameter	SUS304 Stainless hlau	SUS304H 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=0.04-0.10, Si Less dua lossis sib npaug rau 1.00, Mn Tsawg dua lossis sib npaug 2.00, P Tsawg dua lossis sib npaug rau 0.045, S Less dua lossis sib npaug 0.030, Cr=18.00-20.00, Ni=8.00-10.50, Fe=Sib npaug
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
Siab -Tub kub Creep Strength (700 degree)	Creep rupture zog (1000h) Ntau dua los yog sib npaug rau 55MPa	Creep rupture zog (1000h) Ntau dua los yog sib npaug rau 75MPa
Kev Pabcuam Kub	-196℃txog 870℃(kev pabcuam txuas ntxiv)	-196℃txog 870℃(kev pabcuam txuas ntxiv, nyiam rau 600-870℃kev ntxhov siab-kev coj tus kheej)
Qib sib npaug	EN 1.4301, UNS S30400, AISI 304	EN 1.4307, UNS S30409, AISI 304H

Qhov tseem ceeb ntawm kev ua tau zoo sib txawv: 1. High-kub kev ua haujlwm: SUS304H cov ntsiab lus tswj cov pa roj carbon monoxide tsim cov carbides ruaj khov ntawm qhov kub thiab txias, uas pin cov ciam teb thiab txhim kho creep tsis kam; nws 1000h creep rupture lub zog ntawm 700℃yog 36% siab dua SUS 304. 2. Intergranular corrosion kuj: SUS304H yog ntau yooj yim rau intergranular corrosion tom qab vuam tshaj SUS304, yuav tsum tau yuav tsum tau post-weld annealing. 3. Weldability qis dua: SUS 304, SUS 304 zoo dua stability tswv yim kom tsis txhob nplej coarsening cuam tshuam rau siab -kub kev ua haujlwm. 4. Machinability: Ob leeg muaj qhov sib xws, tsis muaj qhov sib txawv . 5. Tus nqi: SUS304H yog 8-12% kim dua SUS304.

Siv tau Scenario Distinction: SUS304 yog haum rau nruab nrab -kub (tsawg dua lossis sib npaug li 600 degree) tsis yog- kev ntxhov siab- cov khoom siv, xws li cov khoom siv ua zaub mov, cov kav dej zoo nkauj, thiab cov khoom siv hluav taws xob sab hauv tsev. SUS304H yog qhov tsim nyog rau siab- qhov kub thiab txias- cov kabmob, xws li boiler superheater raj, siab - kub exchanger tubes (600-870 degree), thiab roj turbine auxiliary Cheebtsam.

Tswv yim Q&A

Q1: Vim li cas SUS304H thiaj li haum rau siab - qhov kub thiab txias - cov khoom siv bearing? A1: Nws tswj cov ntsiab lus carbon (0.04-0.10%) ua kom muaj cov carbides txaus ntawm qhov kub thiab txias, uas tuaj yeem tiv taus cov yas deformation nyob rau hauv ntev - lub sij hawm siab - qhov kub thiab txias siab, zam kev tiv thaiv tsis ua hauj lwm vim creep.

Q2: Dab tsi yog qhov yuav tsum tau tshaj tawm -weld kev kho cua sov rau SUS304H? A2: Yuav tsum ua ncej-weld annealing ntawm 850-900 degree, cua txias; Cov txheej txheem no tshem tawm cov kev ntxhov siab seem, dissolves precipitated carbides, thiab restores high-temperature creep kev ua tau zoo thiab corrosion kuj.

Q3: SUS304 puas tuaj yeem hloov SUS304H hauv siab- qhov kub thiab txias qhov xwm txheej? A3: Tsis yog. Ntawm qhov kub siab tshaj 600 degree, SUS304's creep resistance yog tsis txaus, thiab nws yuav undergo pom tseeb yas deformation tom qab ntev - kev pab cuam lub sij hawm; SUS304H yog cov khoom yuav tsum tau ua rau siab - qhov kub thiab txias - bearing Cheebtsam hauv qhov kub thiab txias.

Q4: Dab tsi yog qhov sib txawv ntawm cov ntsiab lus ntawm cov ntsiab lus ntawm SUS304 thiab SUS304H? A4: SUS304 tsuas yog txwv cov ntsiab lus ntawm cov pa roj carbon monoxide (tsawg dua lossis sib npaug li 0.08%) kom sib npaug tiv thaiv corrosion thiab formability, thaum SUS304H tswj ob sab sauv thiab qis qis (0.04-0.10%) kom ntseeg tau tias carbides txaus rau kev kub siab creep kuj.

Q5: Yuav ua li cas xaiv ntawm SUS304 thiab SUS304H? A5: Xaiv SUS304 yog tias qhov kev pabcuam kub tsawg dua lossis sib npaug li 600℃thiab tsis siv sijhawm ntev -kev ntxhov siab; xaiv SUS304H yog tias qhov kev pabcuam kub yog 600-870℃thiab cov khoom tivthaiv tau ntev -lub sijhawm kub ntxhov siab.