I-Direct Hot Rolling Technology ye-Continuous Casting Billet (CC-HDR)

Esigabeni sokuqala se- 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) Ubuchwepheshe bokukhiqiza ama-slab angenasici;

(2) Ubuchwepheshe bokubona ku-inthanethi bokulimala kwe-cast slab;

(3) Ukusebenzisa ukushisa okucashile kokuqiniswa ukukhiqiza ubuchwepheshe be-slab obusezingeni eliphezulu obuqhubekayo;

(4) Ubuchwepheshe bokulungiswa kobubanzi be-slab ngokushesha ku-inthanethi;

(5) Ukushisa okuqhubekayo nobuchwepheshe bokulawula izinga lokushisa;

(6) Ukuphathwa kwekhompyutha kanye nohlelo lokuhlela lwenqubo.

Ngokwamazinga okushisa e-slab ahlukene angatholakala, inqubo eqhubekayo yokuhlanganisa-yokuhlanganisa ingahlukaniswa ibe:

(1) Ukulethwa okushisayo okunezinga lokushisa eliphansi kwenqubo eqhubekayo yokuginqika ye-slab-reheating (kusuka phezulu);

(2) Ukusakaza okuqhubekayo kwe-billet izinga lokushisa eliphezulu lokulethwa kokushisa kanye nenqubo yokuginqika yokushisisa kabusha (ngenhla okuhle kakhulu);

(3) Ukusakaza i-billet eqhubekayo (ukushisisa kwamakhona amane) inqubo yokugoqa eqondile.

Ukujikijela okuqondile okuqhubekayo okuthuthukiswe i-Nippon Steel’s Sakai Plant kusebenzisa isinxephezelo sezinga lokushisa lokungeniswa kwe-electromagnetic induction faster (ETC) kumakhona amane e-high-temperature cast slab, engagoqelwa ngokuqondile ibe amakhoyili agingqiwe ashisayo.

Izitshalo zensimbi ezinkulu ezweni lami (ezifana ne-Baosteel, njll.) ezikhiqiza amapuleti ekhwalithi ephezulu nazo zizuze ngempumelelo ukugoqa okuqondile okushisayo kwama-slabs asakazayo aqhubekayo.

Ukusakaza okuqhubekayo komumo we-Near-net-net (ukusakazwa kwe-slab emincane ngokuqhubekayo) kuyinqubo entsha eqhubekayo yokulingisa eyakhiwa ngeminyaka yawo-1990s. Selokhu yazalwa, iklanywe njengomugqa wokukhiqiza oqhubekayo onesigayo esigoqayo. Uma i-billet eqhubekayo yokuphonsa ingaqinisiwe ngokuphelele, ukunciphisa ukukhanya kungenziwa ku-intanethi, futhi izinga lokushisa le-billet eqhubekayo lingagcinwa ngaphezu komugqa lapho lingena emshinini wokugoqa, okungukuthi, alizange lenze ukuguqulwa kusuka ku-austenite ( Y isigaba) ukuya ku-ferrite (isigaba). Igingqelwe eshidini lensimbi ngqo esimweni sesigaba sokuqala se-austenite. Izazi zaseShayina zithole ukuthi insimbi ekhiqizwa ngale ndlela ayikhiqizi i-austenite yesibili ngesikhathi sokuginqika (a ^7) kanye nokuchithwa kabusha okuhambisanayo kwesigaba semvula esihlakazekile, ukuze ipuleti elincanyana elikhiqizwa ukuphonsa okuqhubekayo komumo oseduze nenetha babe yizinhlayiya ezinosayizi we-nano, ezinomthelela omuhle kakhulu kwikhwalithi yensimbi. izwe lami lakhe imigqa yokukhiqiza engu-12 yokusakazwa kwe-slab emincane eqhubekayo, futhi okuphumayo konyaka kunesikhundla esibaluleke kakhulu emhlabeni.

Ukusakaza okuqhubekayo kwe-billet empeleni kuwukusakazwa okuqhubekayo komumo we-net-net. Yacwaningwa futhi yathuthukiswa ngaphambili, futhi yasetshenziswa ngempumelelo ngawo-1960. Ngenxa yolwazi kanye nezinga lobuchwepheshe elibanzi ngaleso sikhathi, ukugoqa kabusha kwe-billet okubandayo kwakusetshenziswa kakhulu. Izwe lami likhuthaze ngamandla ubuchwepheshe bokusakaza obuqhubekayo be-billet ngeminyaka yawo-1980, kuhlanganiswe nezimo zezwe lami, kuhlanganiswe neziguquli ezincane (30t) kanye nezigayo zezintambo ezinesivinini esikhulu ukuze kwakhiwe umugqa womkhiqizo omude we-carbon steel, nokukhiqiza okuphezulu (okuningi yalabo abanomphumela wonyaka wamathani ayizigidi ezingu-1 noma ngaphezulu) ), ngokutshalwa kwezimali okuphansi kanye nokuncintisana okuqinile kwensimbi yokwakha. Isidingo sensimbi yokwakha ezweni lami sikhulu, futhi imakethe yemikhiqizo ende nayo ibanzi kakhulu. Ngakho-ke, lo mugqa omncane wokukhiqiza we-converter-billet oqhubekayo wokukhiqiza induku yesigayo socingo uthatha ingxenye enkulu yokukhiqizwa kwensimbi yezwe lami. Ngaphezu kwalokho, ukusakaza okuqhubekayo kwe-billet nakho kunezinzuzo ezithile emikhiqizweni emide yensimbi yesakhiwo esinengxubevange ephansi (njengensimbi enebhola, insimbi yokukhiqiza imishini). Ukuze kuthuthukiswe ukusebenza kahle kokukhiqiza nokonga amandla, ukulethwa okushisayo nokushaja okushisayo kwama-cast slabs nakho kuye kwanakwa kakhulu. Kodwa-ke, kunqunyelwe ezimweni zokuqala zokuklama, akuselula ukuthi izinga lokushisa le-slab lifinyelele ku-700 RON, futhi izinyathelo eziningi zokulondoloza ukushisa zidinga ukuthathwa. Ukushisisa kabusha kwe-billet ikakhulukazi kusebenzisa isithando somlilo esishisa uphethiloli. izwe lami i-Zhenwu Electric Furnace Co., Ltd. yahlongoza futhi yaklama indlela yokushisisa ngokushesha ku-inthanethi kwama-cast slabs ngokungenisa ngozibuthe. Izinzuzo zayo zimi kanje:

(1) Isikhathi sokushisa se-billet esithandweni somlilo esiphakathi sifushane kakhulu kunesikhathi esidingekayo ukuze sishiswe esithandweni somlilo, esingasizi nje ukunciphisa ukulahlekelwa kwensimbi, kodwa futhi sithuthukisa izinga eliphezulu le-cast. i-slab ngesikhathi sokugoqa;

(2) Ngokusebenzisa ukushisisa kokufakelwa kwe-electromagnetic, ayikho imikhiqizo evuthayo endaweni yokushisa, ngaleyo ndlela igwema ngempumelelo i-oxidation kanye nokukhishwa kwe-cast slab, ukuze kutholakale i-billet ehlanzekile ngalokhu kufudumeza okusheshayo;

(3) Njengoba isithando somlilo sokungeniswa singenayo imikhiqizo evuthayo, sinobungani bemvelo futhi sinciphisa kakhulu imisebe yokushisa;

(4) Isithando sokushisa sokungeniswa asigcini nje ngokufaneleka kakhudlwana, sishesha futhi sinembile ukulawula izinga lokushisa ngokuzenzakalelayo, kodwa futhi singonga amandla;

(5) Isithando somlilo se-induction sisetshenziselwa ukushisisa i-billet, futhi izindleko zokugcinwa kwempahla zincane kakhulu kunalezo zesithando somlilo;

(6) Amabhilidi okushisa angeniswayo angashisisa amabhilidi amade kakhulu ngokufaneleka kakhudlwana, okunenzuzo ukubona ukugingqika okungapheli nokuthuthukisa ukusebenza kahle kokugingqika.