Fasahar Motsa Wuta ta Kai tsaye na Ci gaba da Casting Billet (CC-HDR)

A farkon matakin na continuous casting process, the section of the cast slab is small, the temperature drops quickly, and the quality of the cast slab is poor. Therefore, surface finishing is required before rolling, so cold billet reheating is used. This wastes a lot of energy. In the 1980s, after long-term research, Nippon Steel Corporation successfully developed wide-section continuous casting slab hot delivery and hot charging and even hot direct rolling processes, which greatly improved the compactness of continuous casting and continuous rolling. Significantly save energy. In order to realize the hot delivery and direct rolling of continuous casting billets, the following complete sets of technologies are required as a guarantee, namely:

(1) Fasahar masana’anta mara lahani;

(2) Fasahar gano kan layi don lahani na simintin gyare-gyare;

(3) Yin amfani da latent zafi na solidification don samar da high-zazzabi ci gaba da simintin simintin fasahar;

(4) Fasahar daidaita saurin slab nisa akan layi;

(5) Ci gaba da dumama da mirgina fasahar sarrafa zafin jiki;

(6) Gudanar da kwamfuta da tsarin tsarawa don aiwatarwa.

Dangane da matakan zafin jiki daban-daban waɗanda za’a iya samu, ci gaba da aikin simintin gyare-gyare-cigaba da mirgina-haɗin kai za a iya raba zuwa:

(1) Ƙananan zafi isar da zafi na ci gaba da yin simintin gyare-gyaren dumamar yanayi (daga sama);

(2) Ci gaba da yin simintin simintin gyare-gyare mai zafi mai zafi da isarwa mai zafi da saurin jujjuyawar zafi (sama da kyau);

(3) Cigaban simintin simintin gyare-gyare ( dumama kusurwa huɗu) tsarin mirgina kai tsaye.

Ci gaba da yin mirgina kai tsaye wanda Nippon Steel’s Sakai Plant ya ƙera yana amfani da ramuwa mai zafi na induction dumamar yanayi (ETC) don kusurwoyi huɗu na babban simintin simintin simintin, wanda za’a iya jujjuya shi kai tsaye cikin coils masu zafi.

Manyan masana’antar karfe a cikin ƙasata (kamar Baosteel, da sauransu) waɗanda ke samar da faranti masu inganci suma sun sami nasarar yin mirgina mai zafi kai tsaye na ci gaba da ɗorawa.

Ci gaba da simintin simintin kusa-net (sihirin simintin simintin gyare-gyare) sabon tsarin simintin gyare-gyaren da aka haɓaka a cikin 1990s. Tun lokacin da aka haife shi, an tsara shi azaman layin samar da ci gaba tare da ci gaba da birgima. Lokacin da ci gaba da simintin simintin ɗin bai inganta gaba ɗaya ba, ana iya yin raguwar haske akan layi, kuma ana iya kiyaye yanayin zafin billet ɗin ci gaba da yin simintin sama da layin lokacin da ya shiga injin birgima, wato, bai sami canji daga austenite ba ( Y phase) zuwa ferrite (wani lokaci). Birgima a cikin takardar karfe kai tsaye a cikin yanayin matakin austenite na farko. Masanan kasar Sin sun gano cewa karfen da aka samar ta wannan hanya ba ya samar da austenite na biyu a yayin da ake birgima (a ^7) da kuma sake rushewar lokacin hazo da ya tarwatse, don haka farantin bakin ciki da aka samar ta hanyar simintin da ke kusa da siffa mai ci gaba da yin hazo mai taurin ruwa na iya hazo. zama nano-sized barbashi, wanda ke da kyakkyawan sakamako a kan ingancin karfe. kasata ta gina layin samarwa guda 12 don simintin simintin gyare-gyare na ci gaba da yin simintin gyare-gyare, kuma abin da ake fitarwa na shekara-shekara yana da matsayi mai mahimmanci a duniya.

Billet ci gaba da yin simintin gyare-gyare shine ainihin ci gaba da simintin siffa kusa-net. An yi bincike kuma an haɓaka shi a baya, kuma an yi amfani da shi cikin nasara a cikin 1960s. Saboda ilimi da cikakkiyar matakin fasaha a wancan lokacin, an yi amfani da injin billet mai sanyi. Ƙasata ta himmatu wajen inganta fasahar simintin gyare-gyare na billet a cikin shekarun 1980, haɗe da yanayin ƙasata, haɗe da ƙananan masu juyawa (30t) da manyan igiyoyin igiya mai sauri don samar da layin samfurin gaba ɗaya na carbon karfe, tare da yawan aiki (yawanci mai yawa). daga cikin waɗanda ke da fitarwa na shekara-shekara na ton miliyan 1 ko fiye)), tare da ƙarancin saka hannun jari da ƙarfi mai ƙarfi a cikin ƙarfe don gini. Bukatar karafa na gini a kasata yana da yawa, kuma doguwar kasuwar kayayyakin ma tana da fadi sosai. Sabili da haka, wannan ƙaramin juzu’i-billet ci gaba da yin simintin simintin gyare-gyare mai sauri-sauri da layin samar da sandar igiyar waya ya mamaye kaso mai yawa na samar da ƙarfe na ƙasata. Bugu da kari, billet ci gaba da simintin gyaran kafa shima yana da wasu fa’idodi a cikin samfuran dogayen samfura masu ƙarancin ƙarfe na ƙarfe (kamar ƙarfe mai ɗaukar ƙwallon ƙafa, ƙarfe don masana’anta). Domin inganta ingantaccen samarwa da adana makamashi, isar da zafi da caji mai zafi na simintin gyare-gyare an kuma ƙara kulawa. Koyaya, iyakance ga yanayin ƙira na asali, ba shi da sauƙi ga zafin jiki na slab don isa 700 RON, kuma ana buƙatar ɗaukar matakan kiyaye zafi da yawa. Maimaita billet galibi yana amfani da tanderun dumama mai ƙonewa. kasata Zhenwu Electric Furnace Co., Ltd. ta ba da shawara kuma ta tsara hanya don saurin kan layi don dumama simintin gyare-gyare ta hanyar shigar da wutar lantarki. Amfaninsa sune kamar haka:

(1) Lokacin dumama billet a cikin tanderun mitar matsakaici ya fi guntu fiye da lokacin da ake buƙata don yin zafi a cikin tanderun wuta, wanda ba wai kawai yana taimakawa wajen rage asarar ƙarfe ba, har ma yana haɓaka ingancin simintin. slab a lokacin aikin mirgina;

(2) Yin amfani da dumama shigar da wutar lantarki, babu samfuran konewa a cikin yankin dumama, ta yadda za a guje wa oxidation da decarburization na simintin simintin gyare-gyare, ta yadda za a iya samun billet mai tsabta ta wannan saurin dumama;

(3) Tun da induction dumama tanderun ba shi da kayayyakin konewa, yana da alaƙa da muhalli kuma yana rage zafin zafi sosai;

(4) Induction dumama tanderun ba kawai ya fi dacewa ba, mai sauri da daidai don sarrafa zafin jiki ta atomatik, amma kuma yana iya adana makamashi;

(5) Ana amfani da tanderun dumama induction don dumama billet, kuma farashin kayan aikin ya yi ƙasa da na tanderun harshen wuta;

(6) Induction dumama billlets na iya ɗora manyan billet ɗin da suka fi dacewa, wanda ke da fa’ida don gane mirgina mara iyaka da haɓaka ingantaccen mirgina.