Stainless hlau 304 (SS304) flangeyog cov kav dej uas tsim los ntawm austenitic stainless hlau alloy tsim raws li UNS S30400 lossis DIN 1.4301, tus yam ntxwv los ntawm nws cov nominal muaj pes tsawg leeg ntawm 18% chromium thiab 8% npib tsib xee, nrog qhov sib npaug feem ntau hlau.
Kab lus no qhia txog qhov muaj pes tsawg leeg ntawm SS304 flanges.
Tshuaj muaj pes tsawg leeg ntawm SS304 Flanges
Raws li ASTM A182, cov kev qhia tshwj xeeb tswj hwm forged stainless hlau flanges, cov tshuaj muaj pes tsawg leeg ntawm SS304 yuav tsum ua raws li qhov feem pua txheej txheem.
Chromium (Cr): 18.0% -20.0%
Chromium yog lub ntsiab tseem ceeb uas ua rau stainless hlau "stainless." Hauv SS304 flanges, chromium cov ntsiab lus nyob ntawm 18.0% txog 20.0% los ntawm qhov hnyav. Chromium reacts nrog oxygen los ua ib tug nyias, adherent chromium oxide passive txheej ntawm flange nto. Cov txheej no, kwv yees li 3 nanometers tuab, yog tus kheej - kho nyob rau hauv oxidizing ib puag ncig thiab muab cov flange nrog nws qhov tseem ceeb corrosion kuj. Thaum puas lawm, cov chromium nyob rau hauv lub alloy sai hloov kho qhov kev tiv thaiv zaj duab xis, muab cov pa oxygen tam sim no. Qhov tsawg kawg nkaus 18% chromium cov ntsiab lus hauv SS304 ua kom cov txheej txheem muaj zog muaj zog thoob plaws ntau qhov chaw pabcuam.
Nickel (Ni): 8.0% -11.0%
Nickel yog qhov tseem ceeb tshaj plaws alloying thib ob hauv SS304 flanges, feem ntau tam sim no ntawm 8.0% thiab 11.0%. Nickel stabilizes austenitic microstructure ntawm chav tsev kub, uas yuav hloov mus rau martensite thaum txias. Qhov no austenitic qauv muab tshwj xeeb toughness, ductility, thiab formability. Nickel kuj tseem txhim khu kev tiv thaiv corrosion hauv kev txo qhov chaw thiab txhim kho kev ua haujlwm siab - kub. 8% cov ntsiab lus npib tsib xee yam tsawg kawg nkaus yog qhov tso cai rau SS304 flanges nyob twj ywm tsis yog{10}}sib nqus nyob rau hauv cov mob annealed thiab tuav ductility ntawm cryogenic kub.
Cov pa roj carbon (C): 0.08% Max
Cov ntsiab lus carbon hauv SS304 flanges raug txwv rau qhov siab tshaj plaws ntawm 0.08%. Cov pa roj carbon tsawg tsawg no ua haujlwm tseem ceeb hauv kev ua haujlwm ntawm metallurgical: nws txo qis cov nag lossis daus ntawm chromium carbides ntawm cov ciam teb thaum lub sij hawm vuam los yog qhov kub siab. Thaum chromium carbides daim ntawv, lawv deplete thaj chaw nyob ib sab ntawm chromium hauv qab 12% qhov pib yuav tsum tau rau cov txheej txheem passive, ua rau intergranular corrosion hu ua sensitization. Qhov siab tshaj 0.08% sawv cev rau qhov sib npaug ntawm qhov yuav tsum tau muaj zog thiab rhiab heev.
Manganese (Mn): 2.00% siab tshaj
Manganese ua haujlwm ntau yam hauv SS304 flanges. Nws ua raws li deoxidizer thaum lub sij hawm steelmaking, ua ke nrog sulfur los txhim kho kev ua haujlwm kub, thiab pab txhawb rau austenite stability. Thaum manganese tsis muaj zog tshaj npib tsib xee rau kev tsim austenite, nws muab kev ruaj ntseg ntxiv thiab txhim kho lub zog. Qhov siab tshaj 2.00% ua kom cov txiaj ntsig no tsis muaj kev cuam tshuam corrosion.
Silicon (Si): 0.75% - 1.00% siab tshaj
Silicon yog tam sim no raws li tus neeg sawv cev deoxidizing residual los ntawm steelmaking, feem ntau txwv rau 0.75% siab tshaj plaws nyob rau hauv feem ntau specifications. Nws txhim kho oxidation tsis kam ntawm qhov kub thiab txias thiab nce fluidity thaum lub sij hawm casting lossis forging ua haujlwm. Qee qhov tshwj xeeb SS304 flange tso cai rau 1.00% silicon, txawm tias qhov qis dua yog ntau dua rau kev pabcuam corrosion.
Phosphorus (P): 0.045% Qhov siab tshaj plaws thiab Sulfur (S): 0.030% Qhov siab tshaj plaws
Phosphorus thiab sulfur yog impurity ntsiab nyob rau hauv SS304 flanges. Phosphorus tuaj yeem ua rau txias luv thiab txo cov weldability, thaum leej faj ua cov sulfide inclusions uas txo cov corrosion kuj thiab kub workability. Qhov siab tshaj plaws ntawm 0.045% rau phosphorus thiab 0.030% rau sulfur kom pom kev fabricability thiab corrosion kev ua tau zoo.
Hlau (Fe): Sib npaug
Hlau tsim cov feem pua ntawm cov alloy, feem ntau 66% mus rau 74% ntawm tag nrho cov muaj pes tsawg leeg. Thaum hlau muab lub hauv paus hlau matrix, nws cov khoom tau hloov pauv tag nrho los ntawm kev sib xyaw ua ke ntawm chromium thiab npib tsib xee. Cov hlau -chromium-nickel solid tov forms austenitic qauv uas muab SS304 flanges lawv cov yam ntxwv ua ke ntawm lub zog, toughness, thiab corrosion kuj.
Dab tsi yog SS304 Flange Ua Los Ntawm?
SS304 flanges yog tsim los rau cov qauv nruj nruj uas tswj tsis tau tsuas yog tshuaj lom neeg muaj pes tsawg leeg, tab sis kuj muaj cov khoom siv kho tshuab thiab kev kho cua sov. Thawj qhov tshwj xeeb rau wrought SS304 flanges yog ASTM A182 / ASME SA-182, uas npog forged lossis dov alloy thiab stainless hlau yeeb nkab flanges npaj rau kev pabcuam kub.
Qhov kev qhia tshwj xeeb no xav kom SS304 flanges tau txais kev daws teeb meem kev kho cua sov. Cov flanges yuav tsum tau muab tso rau qhov kub ntawm qhov tsawg kawg nkaus ntawm 1900℃F (1040 degree) kom yaj cov carbide precipitated thiab ua kom tiav austenitization, ua raws li ceev ceev quenching hauv dej los yog lwm yam ntaub ntawv tsim nyog kom khaws cov pa roj carbon monoxide. Qhov kev kho cua sov no ua rau cov yam ntxwv zoo li austenitic microstructure thiab optimizes corrosion kuj.
Cov tshuaj muaj pes tsawg leeg yuav tsum muaj nyob rau hauv ASTM A182 ua raws li cov kev txwv uas tau tham saum toj no tab sis yuav txawv me ntsis ntawm cov kev hloov kho sib txawv lossis cov kev xav tau ntxiv. Rau cov ntawv thov tseem ceeb, cov neeg yuav khoom tuaj yeem hais qhia ntxiv txog kev tswj hwm, xws li cov pa roj carbon tsawg dua rau kev txhim kho weldability lossis nruj dua sulfur ntau rau kev txhim kho machinability.
Cov npe sib npaug rau SS304 flange cov khoom suav nrog:
|
Txuj |
Lub npe |
|
UNS |
S30400 |
|
DIN |
1.4301 |
|
EN |
X5CrNi18-10 |
|
JIS |
TIAB SA 304 |
|
BS |
304S31 |
SS304 Flange Mechanical Properties
Cov tshuaj muaj pes tsawg leeg ntawm SS304 flanges txhais ncaj qha mus rau hauv cov cuab yeej ntsuas ntsuas uas txiav txim siab qhov kev ua tau zoo. Yam tsawg kawg uas yuav tsum tau muaj rau ASTM A182 suav nrog:
- Tensile zog: 515 MPa (75,000 psi) yam tsawg kawg nkaus
- Yield zog (0.2% offset): 205 MPa (30,000 psi) yam tsawg kawg nkaus
- Elongation: 30% -40% yam tsawg kawg nkaus hauv 50mm
- Hardness: Rockwell B 92 siab tshaj (Brinell 201 siab tshaj)
Cov qauv austenitic imparted los ntawm chromium-nickel ua ke muab cov ductility zoo heev thiab toughness nyob rau hauv ntau qhov kub thiab txias, los ntawm kev pabcuam cryogenic mus rau qhov kub siab mus txog 800℃hauv kev pabcuam txuas ntxiv. Qhov ntom ntawm SS304 flanges yog kwv yees li 8.0 g / cm³, nrog rau qhov sib txawv ntawm 1400℃- 1450 degree.
Xaus
SS304 flanges yog tsim los ntawm kev tswj hwm austenitic stainless hlau alloy uas muaj 18% - 20% chromium, 8% - 11% nickel, siab tshaj 0.08% carbon, thiab hlau raws li qhov sib npaug.
Txawm hais tias tau teev tseg hauv nws daim ntawv qauv lossis qis dua -carbon 304L rau kev txhim kho weldability, SS304 flange tseem yog cov khoom siv ua haujlwm thoob plaws kev lag luam xws li kev ua zaub mov mus rau kev tsim tshuaj lom neeg thiab tsim hluav taws xob.
