Vim li cas Tundish Metering Nozzle Clog?

Nyob rau hauv nruam casting ntau lawm, clogging ntawm lubtundish sizing nozzleyog ib tug ntev - sawv thiab teeb meem. Thaum lub nozzle raug thaiv, molten hlau tsis tuaj yeem ntws, thiab nruam casting yuav tsum tau cuam tshuam. Qhov no tsis tsuas yog cuam tshuam rau cov zis tab sis kuj tseem tuaj yeem ua rau cov khoom tawg ntawm tag nrho cov cua sov ntawm cov hlau. Lub sizing nozzle tswj qhov ruaj khov ntws ntawm molten steel rau hauv pwm. Nws muaj ib tug meej me me bore nyob rau hauv, thiab lub bore txoj kab uas hla ncaj qha txiav txim lub casting ceev. Thaum lub qhov me me no raug thaiv los ntawm cov khoom txawv teb chaws, molten steel tsis tuaj yeem hla mus ntxiv.

 

 

Thaum lub sij hawm steelmaking, cov khoom xws li txhuas thiab silicon yog ntxiv rau deoxidation. Lawv hnov ​​​​mob nrog cov pa oxygen los ua kom siab - melting- cov ntsiab lus xws li alumina (Al₂O₃) thiab calcium silicate. Cov kev suav nrog no coj zoo li cov xuab zeb zoo hauv cov hlau molten. Ntawm lub nozzle, vim muaj kev hloov pauv hauv kev khiav ceev thiab qhov kub thiab txias, lawv maj mam ua raws li cov phab ntsa sab hauv, sib sau ua ke, thiab thaum kawg ua rau txhaws.

 

Tej yam ntxwv: Cov khoom siv clogging yog dawb los yog greyish -dawb nrog ib tug tawv zoo nkauj.

 

 

Los ntawm lub ladle mus rau tundish thiab ces mus rau pwm, molten steel yog tas li nyob rau hauv kev sib cuag nrog huab cua, slag, thiab refractory ntaub ntawv. Yog tias kev tiv thaiv casting tsis txaus, cov ntsiab lus alloying nyob rau hauv cov hlau molten yuav rov ua dua oxidized, tsim cov khoom tshiab. Cov "tshiab" oxides no muaj zog heev thiab nyiam ua kom yooj yim rau ntawm phab ntsa nozzle.

 

Yooj yim overlooked cov ntsiab lus:Tsis zoo sealing ntawm lub nozzle ntev thiab untimely ntxiv ntawm tundish npog tus neeg sawv cev tuaj yeem ua rau oxidation theem nrab.

 

 

Txhua qib steel muaj qhov tsim nyog casting kub. Yog tias qhov kub thiab txias qis dhau lawm, qhov viscosity ntawm cov hlau molten nce thiab nws cov fluidity deteriorates, ua rau cov khoom muaj feem ntau yuav tso nyiaj. Ntxiv rau, cov hlau molten tuaj yeem ua ib feem ntawm lub nozzle, ncaj qha ua rau lub nozzle rau "khov". Qhov no zoo ib yam li dej khov hauv cov kav dej hauv lub caij ntuj no.

 

Txoj kev txiav txim:Yog hais tias cov khoom siv clogging muaj ib tug metallic luster thiab dendritic crystals, nws yog feem ntau tshwm sim los ntawm solidification vim tsis kub.

 

 

Txhawm rau txhim kho cov castability ntawm molten steel, kev kho calcium yog siv rau ntau qib steel los hloov cov khoom alumina rau hauv cov kua calcium aluminate. Txawm li cas los xij, tsis txaus los yog ntau dhau ntawm calcium ntxiv yuav ua rau siab -melting-point calcium aluminates (xws li CA₂, CA₆). Cov khoom no muaj cov ntsiab lus melting saum toj no 1600 degree, siab dua molten steel kub, yog li lawv ib txwm tsim cov khoom thiab txhaws lub nozzle.

 

Kev lag luam hais tias: "Clogging tshwm sim nrog tsawg calcium, thiab kuj muaj calcium ntau dhau" - qhov no yog raws nraim li nws txhais tau.

 

 

CovTundish Meteringnozzlenws tus kheej yog ua los ntawm cov khoom siv refractory. Yog tias cov khoom siv tsis zoo thiab kev yaig tsis muaj zog, cov phab ntsa sab hauv yuav tawg thiab tawg tom qab ntev - lub sij hawm yaig los ntawm cov hlau molten. Cov fragments refractory ncaj qha thaiv lub bore, ua rau clogging. Txawm hais tias tsis tshwm sim, hom teeb meem no feem ntau hnyav thaum nws tshwm sim.

 

Yuav txheeb xyuas qhov ua li cas?

Saib xyuas qhov pom ntawm cov khoom siv clogging:

• Dawb hmoov → alumina inclusions
• Greyish-dub flaky → cov khoom oxidation theem nrab
• Metallic luster nrog dendritic zoo → molten steel solidification
• Angular lumps → refractory spalling

 

Kev daws teeb meem

• Txo kev suav nrog ntawm qhov chaw - optimize deoxidation thiab calcium kev kho cov txheej txheem.
• Tiv thaiv oxidation thaum lub sij hawm casting - ntxiv dag zog tiv thaiv kev ntsuas.
• Khaws cov khoom kom raug - kom molten steel kub txaus siab.
• Xaiv lub siab- zoo refractories - tsis txhob pheej yig, qis - zoo nozzles.

 

 

Txawm tiasTundish Metering nozzleclogging zoo li yog ib qho teeb meem nozzle, nws cov hauv paus ntsiab lus tiag tiag nyob rau hauv molten steel huv si thiab cov txheej txheem tswj. Thaum txhua kauj ruam los ntawm steelmaking mus rau nruam casting yog ua kom zoo, lub nozzle clogging tus nqi yuav ib txwm txo. Yog tias clogging tshwm sim ntau zaus ntawm koj cov kab ntau lawm, koj tuaj yeem kho qhov teeb meem raws li tsib yam uas tau hais los saum toj no - qhov laj thawj feem ntau tuaj yeem txheeb xyuas tau.

(Clogging ua rau tej zaum yuav txawv nrog cov qib steel sib txawv thiab kev ua haujlwm. Kev tshuaj xyuas raws li cov xwm txheej tiag tiag raug pom zoo.)