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

Kumayambiriro kwa 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) Ukadaulo wopanga ma slab wopanda cholakwika;

(2) Ukadaulo wodziwira pa intaneti pazowonongeka za slab;

(3) Kugwiritsa ntchito kutentha kobisika kwa kulimba kuti apange ukadaulo wapamwamba kwambiri wopitilira kuponya slab;

(4) Ukadaulo wosintha mwachangu pa intaneti wa slab m’lifupi;

(5) Kutentha kosalekeza ndi ukadaulo wowongolera kutentha;

(6) Kasamalidwe ka makompyuta ndi dongosolo lokonzekera ndondomeko.

Malingana ndi kutentha kwa slab komwe kungapezeke, njira yopititsira patsogolo-yopitirizabe yophatikizana ingagawidwe:

(1) Kutentha kwapang’onopang’ono kwapang’onopang’ono kopitilirabe kuponyedwa kwa slab-reheating process (kuchokera pamwamba);

(2) mosalekeza kuponyera billet kutentha yobereka yotentha ndi mofulumira reheat ndondomeko anagubuduza (pamwamba kwambiri);

(3) mosalekeza kuponyera billet (anayi ngodya Kutentha) mwachindunji anagubuduza ndondomeko.

Kugudubuzika kosalekeza kopangidwa ndi Nippon Steel’s Sakai Plant kumagwiritsa ntchito chiwongola dzanja cha kutentha kwa electromagnetic induction rapid heat (ETC) pamakona anayi a slab yotentha kwambiri, yomwe imatha kukulungidwa mwachindunji kukhala ma coils otenthedwa.

Zomera zazikulu zazitsulo m’dziko langa (monga Baosteel, etc.) zomwe zimapanga mbale zapamwamba zakwanitsanso bwino kugubuduza kwachindunji kwa slabs mosalekeza.

Kutulutsa mosalekeza kwa mawonekedwe apafupi ndi ukonde (kuponya mosalekeza kocheperako) ndi njira yatsopano yopangira yomwe idapangidwa mu 1990s. Chiyambireni kubadwa kwake, idapangidwa ngati mzere wopanga mosalekeza wokhala ndi mphero yosalekeza. Pamene billet yosalekeza yosasunthika siimalimba kwathunthu, kuchepetsa kuwala kungathe kuchitidwa pa intaneti, ndipo kutentha kwa billet yopitirirabe kungathe kusungidwa pamwamba pa mzere pamene ikulowa mu mphero, ndiko kuti, sikunayambe kusintha kuchokera ku austenite ( Y phase) kupita ku ferrite (gawo). Adagulung’undisa mu zitsulo pepala mwachindunji mu chikhalidwe cha austenite gawo loyamba. Akatswiri achi China apeza kuti chitsulo chopangidwa motere sichimatulutsa austenite yachiwiri pakugubuduza (a ^ 7) ndi kuthanso kofananira kwa gawo lamadzi omwazika, kotero kuti mbale yopyapyala yopangidwa ndi pafupi-mawonekedwe opitilira muyeso, mpweya wowumitsa umatha. kukhala nano-kakulidwe particles, amene ali ndi zotsatira zabwino kwambiri pa khalidwe zitsulo. dziko langa lapanga mizere yopangira 12 yopangira ma slab mosalekeza, ndipo zotulutsa zapachaka zimakhala ndi malo ofunikira kwambiri padziko lapansi.

Billet mosalekeza kuponya kwenikweni kumakhala pafupi ndi mawonekedwe a ukonde mosalekeza. Idafufuzidwa ndikupangidwa kale, ndipo idagwiritsidwa ntchito bwino m’ma 1960. Chifukwa cha chidziwitso ndi luso lambiri panthawiyo, kuzizira kwa billet reheating kunkagwiritsidwa ntchito kwambiri. dziko langa mwamphamvu kulimbikitsa billet mosalekeza kuponyera luso mu 1980s, pamodzi ndi zikhalidwe dziko langa, kuphatikizapo converters ang’onoang’ono (30t) ndi mkulu-liwiro waya ndodo mphero kupanga ambiri mpweya zitsulo yaitali mankhwala mzere, ndi zokolola zambiri (zambiri mwa omwe ali ndi chiwongoladzanja chapachaka cha matani 1 miliyoni kapena kuposerapo) ), ndi ndalama zochepa komanso kupikisana kwamphamvu muzitsulo zomanga. Kufunika kwazitsulo zomanga m’dziko langa ndikwambiri, ndipo msika wamtali wazinthu umakhalanso wotakata. Chifukwa chake, chingwe chaching’ono ichi chosinthira-billet chopitilira kuponya-liwiro lopangira mphero yamawaya chimakhala ndi gawo lalikulu la kupanga zitsulo mdziko langa. Komanso, billet mosalekeza kuponyera alinso ndi ubwino otsika aloyi zitsulo structural zitsulo yaitali mankhwala (monga mpira kubala zitsulo, zitsulo kupanga makina). Pofuna kupititsa patsogolo luso la kupanga ndikupulumutsa mphamvu, kutumiza kotentha ndi kulipiritsa kotentha kwa ma slabs kumaperekedwanso kwambiri. Komabe, pongoyerekeza ndi mapangidwe apachiyambi, sikophweka kuti kutentha kwa slab kufika pa 700 RON, ndipo njira zambiri zotetezera kutentha ziyenera kuchitidwa. Kutenthetsanso kwa billet nthawi zambiri kumagwiritsa ntchito ng’anjo yoyaka moto. dziko langa Zhenwu Electric Furnace Co., Ltd. adakonza ndikupanga njira yowotchera mwachangu ma slabs pa intaneti pogwiritsa ntchito ma elekitiromagineti induction. Ubwino wake ndi motere:

(1) Kutentha nthawi ya billet mu ng’anjo yapakati pafupipafupi ndi yayifupi kwambiri kuposa nthawi yofunikira kuti itenthetsedwe mu ng’anjo yamoto, zomwe sizimangothandiza kuchepetsa kutayika kwachitsulo, komanso kumapangitsanso mawonekedwe apamwamba a chitsulo. chotupa pa nthawi ya kugubuduza;

(2) Pogwiritsa ntchito kutentha kwa magetsi opangira magetsi, palibe zinthu zoyaka moto m’malo otentha, potero zimapewa ma oxidation ndi decarburization ya slab yoponyera, kuti billet yoyera ipezeke kudzera mukuwotcha mwachangu uku;

(3) Popeza ng’anjo yotenthetsera yotenthetsera ilibe zinthu zoyaka, ndiyotetezeka komanso imachepetsa kwambiri kutentha;

(4) Kutentha kwa ng’anjo yopangira ng’anjo sikungokhala kosavuta, kwachangu komanso kolondola kuti kuzitha kuwongolera kutentha, komanso kumatha kupulumutsa mphamvu;

(5) Kutentha kwa ng’anjo yotentha kumagwiritsidwa ntchito kutenthetsa billet, ndipo mtengo wokonza zipangizo ndi wochepa kwambiri kuposa wa ng’anjo yamoto;

(6) Mabotolo otenthetsera otenthetsera amatha kutenthetsa ma billets aatali kwambiri mosavuta, zomwe zimapindulitsa kuzindikira kugudubuzika kosatha ndikuwongolera kuyendetsa bwino.