Qhov Ultra-High Power Grade txhais li cas
Graphite electrodes raug ntsuas los ntawm qhov ceev tam sim no lawv tuaj yeem nqa. Hauv kev faib tawm ntawm GB / T 3072, lub zog hluav taws xob tsis tu ncua ua haujlwm qis dua 17 A / cm2, lub zog hluav taws xob siab hauv 18 -25 A / cm2 band, thiab ultra-siab zog (UHP) electrodes saum 25 A / cm2. UHP electrodes yog tsim los ntawm cov nplua nplej koob coke nrog cov hmoov tshauv tsawg, yog li ib txoj kab uas hla muab tam sim no ntau dua ua ntej thaj tsam qaum teb overheats. Cov khoom siv ib txwm npog 300-700 mm txoj kab uas hla ntawm qhov ntev ntawm 1800 mm thiab 2100 mm.
Qhov zoo ntawm UHP Graphite Electrodes
High hluav taws xob conductivity- UHP resistivity feem ntau yog 5.5-6.5 micro-ohm meter, yog li joule poob raws kab nyob qis.
Thermal shock resistance- rab koob coke qauv zam lub tshav kub ceev- nce thiab txias - nqes ntawm ib lub voj voog ntawm lub cub tawg.
Kub muaj peev xwm- lub taub hau ciaj sia arc kub nyob rau hauv qhov kev txiav txim ntawm 3000 C thiab siab dua.
Tsawg tshauv thiab tsis muaj sulfur- tsis muaj kev sib kis ntxiv rau hauv chav da dej steel.
Machinability thiab recyclability- nruj thread kam rau ua yuav raug txiav, thiab stubs thiab seem rov qab mus rau cov khoom siv carbon.
Qhov tsis zoo thiab kev txwv kev ua haujlwm
Oxidation- graphite oxidises nyob rau hauv huab cua los ntawm kwv yees li 450-500 C, yog li cov kab sab phab ntsa thiab cov cheeb tsam sib koom ua ke, tsis yog arc taub, teeb tsa lub neej kev pab cuam.
Brittleness- sab loading los ntawm seem qhov tsua- nyob rau hauv tawg ntawm lub cev, yog li them nqi xyaum cuam tshuam tus nqi ntau npaum li qib xaiv.
Kev sib koom tes rhiab heev- cov xov qias neeg los yog tsis raug ua rau- nce torque tawg lub txiv mis tapered.
Nqi thiab khoom siv- koob coke dominates tus nqi raw khoom thiab nws tus nqi yog volatile.
Qib Kev Sib Piv los ntawm Tam Sim No Ceev
| Qib | Tam sim no ceev | Hom kab | Lub ntsiab rauv hom |
|---|---|---|---|
| RP, lub zog tsis tu ncua | qis dua 17 A / cm2 | 75-500 hli | Ordinary fais fab steelmaking, silicon thiab daj phosphorus refining |
| HP, siab zog | 18-25 A / cm2 | 200-600 hli | High-power hluav taws xob arc rauv |
| UHP, ultra- lub zog siab | siab tshaj 25 A / cm2 | 300-700 hli | Ultra{0}}siab zog EAF thiab ladle rauv |
Test Methods thiab Qib Xaiv
Qhov ntom ntom yog txiav txim siab rau ASTM C559, hluav taws xob tiv taus rau ASTM C611 ntawm chav tsev kub, flexural zog rau ASTM C651 hauv plaub- taw tes loading, thiab elastic modulus rau ASTM C747 los ntawm sonic tshaj tawm; Qib kev faib tawm, qhov ntev thiab qhov kam rau ua tau teev tseg hauv GB / T 3072. Cov ntawv thov qib sib piv tsuas yog thaum daim ntawv teev cov ntaub ntawv qhia txog qhov ntom ntom, tiv taus, flexural zog thiab coefficient ntawm thermal expansion rau qhov tseeb ntau lawm. Kev xaiv ua raws li lub zog hluav taws xob: ib zaug ua haujlwm tam sim no dhau li ntawm 25 A / cm2 tsuas yog UHP electrode tuav nws cov duab thiab kev sib koom ua ke, thaum UHP electrode ntawm lub cub tawg me dhau - tau qhia thiab nce nqi ib tonne ntawm cov hlau.
Cov lus nug nquag
Q:Dab tsi yog qhov ceev tam sim no txhais tau tias UHP graphite electrode?
A: Tshaj li 25 A / cm2 hauv kev muab qhab nia siv los ntawm GB / T 3072. RP qib ua haujlwm qis dua 17 A / cm2 thiab qib HP hauv 18-25 A / cm2 band.
Q:Dab tsi yog qhov tsis zoo ntawm UHP graphite electrodes?
A: Oxidation. Graphite reacts nrog huab cua los ntawm li 450-500 C, yog li ntawm sab phab ntsa thiab lub txiv mis ob leeg tau noj sai dua li qhov arc taub.
Q:Puas yog UHP electrodes ntau dua li HP electrodes?
A: Yog. Hom UHP resistivity yog 5.5-6.5 micro-ohm meter tiv thaiv tus lej siab dua rau qib HP thiab RP, uas txo qis hauv kab.
Q:Cov qauv twg npog cov qib electrode thiab kuaj?
A: GB / T 3072 suav nrog qib kev faib tawm thiab qhov ntev, thaum ASTM C559, C611, C651 thiab C747 npog ntom ntom, tiv taus, flexural zog thiab elastic modulus.
Q:Vim li cas UHP electrodes tawg ntawm qhov sib koom ua ke ntau dua li qhov ntxeev?
A: Lub tapered sib koom ua ke yog ib tug neeg kho tshuab discontinuity, yog li torque yuam kev, xov puas los yog thermal cycling concentrates muaj kev ntxhov siab thiab ua rau tsis ua hauj lwm.