Nyob rau hauv cov txheej txheem smelting, vim yog siv tsis zoo los yog them nyiaj thiab ntau decarbonization thiab lwm yam laj thawj, tej zaum cov ntsiab lus carbon nyob rau hauv steel los yog hlau tsis tau raws li qhov yuav tsum tau, ces nws yog tsim nyog los carburize cov hlau los yog kua hlau.Cov khoom tseem ceeb uas siv rau carburizing yog anthracite hmoov, carburized npua hlau, electrode hmoov, roj av coke hmoov, asphalt coke, charcoal hmoov thiab coke hmoov.Cov kev xav tau ntawm lub carburizer yog tias qhov siab dua cov ntsiab lus ntawm cov pa roj carbon monoxide, qhov zoo dua, thiab qis dua cov ntsiab lus ntawm cov khoom tsis zoo xws li cov tshauv, cov teeb meem tsis zoo thiab cov leej faj, qhov zoo dua, yog li tsis txhob ua phem rau cov hlau.
Lub smelting ntawm castings siv high-zoo recarburizer tom qab kub kub roasting roj av coke nrog ob peb impurities, uas yog qhov tseem ceeb tshaj txuas nyob rau hauv cov txheej txheem carburizing.Qhov zoo ntawm cov recarburizer txiav txim siab qhov zoo ntawm cov kua hlau, thiab tseem txiav txim siab seb cov nyhuv graphitization puas tuaj yeem tau txais.Hauv luv luv, txo cov hlau shrinkage recarburizer plays lub luag haujlwm tseem ceeb.
Thaum tag nrho cov seem hlau yog melted nyob rau hauv hluav taws xob rauv, lub recarburizer uas tau graphitized yog nyiam, thiab cov recarburizer uas tau raug graphitized ntawm qhov kub thiab txias tuaj yeem hloov cov pa roj carbon atoms los ntawm qhov qub kev tsis sib haum xeeb rau daim ntawv, thiab daim ntawv graphite tuaj yeem ua qhov zoo tshaj plaws. core ntawm graphite nucleation los txhawb graphitization.Yog li ntawd, peb yuav tsum xaiv lub recarburizer uas tau kho nrog kub graphitization.Vim tias qhov kub siab graphitization kev kho mob, cov ntsiab lus sulfur yog tsim tawm SO2 roj khiav thiab txo.Yog li ntawd, cov ntsiab lus sulfur ntawm high-zoo recarburizer yog tsawg heev, feem ntau tsawg dua 0.05%, thiab qhov zoo dua yog tsawg dua 0.03%.Nyob rau tib lub sijhawm, qhov no kuj yog qhov qhia tsis ncaj ntawm seb nws puas tau kho nrog kub graphitization thiab seb graphitization puas zoo.Yog hais tias tus xaiv recarburizer tsis graphitized ntawm qhov kub thiab txias, lub peev xwm nucleation ntawm graphite txo qis heev, thiab lub peev xwm graphitization tsis muaj zog, txawm tias tib cov pa roj carbon ntau tuaj yeem ua tiav, tab sis cov txiaj ntsig sib txawv kiag li.
Lub npe hu ua recarburizer yog txhawm rau ua kom cov pa roj carbon ntau hauv cov kua hlau tom qab ntxiv, yog li cov ntsiab lus ruaj khov ntawm cov recarburizer yuav tsum tsis txhob qis dhau, txwv tsis pub kom ua tiav qee cov ntsiab lus carbon, koj yuav tsum tau ntxiv cov khoom ntau tshaj qhov siab. -carbon recarburizer, uas undoubtedly tsub kom tus nqi ntawm lwm yam unfavorable ntsiab nyob rau hauv lub carburizer, thiaj li hais tias cov kua hlau yuav tsis tau zoo rov qab.
Tsawg leej faj, nitrogen thiab hydrogen ntsiab yog qhov tseem ceeb los tiv thaiv kev tsim cov nitrogen pores hauv castings, yog li cov ntsiab lus nitrogen ntawm recarburizer yuav tsum tsawg li tsawg tau.
Lwm qhov ntsuas ntawm lub recarburizer, xws li cov dej noo, tshauv, volatiles, qis dua cov pa roj carbon monoxide, qhov siab dua cov pa roj carbon monoxide, yog li cov pa roj carbon ntau, cov ntsiab lus ntawm cov khoom tsis zoo no yuav tsum tsis txhob muaj. siab.
Rau cov txheej txheem melting sib txawv, hom rauv thiab qhov luaj li cas ntawm lub qhov cub melting, nws tseem ceeb heev uas yuav tau xaiv txoj cai recarburizer particle loj, uas tuaj yeem txhim kho qhov nqus thiab nqus tus nqi ntawm cov recarburizer hauv cov kua hlau, thiab tsis txhob oxidation thiab hlawv poob ntawm lub carburizer tshwm sim los ntawm qhov me me heev.Nws qhov loj me yog qhov zoo tshaj plaws: 100kg rauv yog tsawg dua 10mm, 500kg rauv yog tsawg dua 15mm, 1.5 tuj rauv yog tsawg dua 20mm, 20 tuj rauv yog tsawg dua 30mm.Nyob rau hauv converter smelting, thaum high carbon steel yog siv, recarburizer uas muaj ob peb impurities yog siv.Cov kev cai rau cov recarburizer siv nyob rau hauv lub sab saum toj cua tshuab converter steelmaking yog siab taag carbon, tsawg cov ntsiab lus ntawm tshauv, volatile thiab sulfur, phosphorus, nitrogen thiab lwm yam impurities, thiab qhuav, huv si, nruab nrab particle loj.Nws ruaj ruaj carbon C≥96%, volatile cov ntsiab lus ≤1.0%, S≤0.5%, noo noo ≤0.5%, particle loj nyob rau hauv 1-5 hli.Yog tias qhov loj me me dhau lawm, nws yooj yim rau hlawv, thiab yog tias nws ntxhib dhau lawm, nws ntab rau saum npoo ntawm cov kua hlau thiab tsis yooj yim rau absorbed los ntawm cov hlau molten.Rau qhov induction rauv particle loj nyob rau hauv 0.2-6 hli, ntawm cov hlau thiab lwm yam dub hlau particle loj nyob rau hauv 1.4-9.5 hli, siab carbon steel yuav tsum tsis muaj nitrogen, particle loj nyob rau hauv 0.5-5 hli thiab hais txog.Qhov tshwj xeeb xav tau raws li qhov tshwj xeeb rauv hom smelting workpiece hom thiab lwm yam ntsiab lus tshwj xeeb kev txiav txim siab thiab xaiv.
Post lub sij hawm: Aug-25-2023