Direct Kub Rolling Technology ntawm Nruam Casting Billet (CC-HDR)

Hauv theem ntxov ntawm lub 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) Tsis muaj teeb meem slab manufacturing technology;

(2) Cov cuab yeej tshawb nrhiav hauv online rau cam khwb cia qhov tsis xws luag;

(3) Siv latent cua sov ntawm solidification los tsim high-temperature nruam casting slab tshuab;

(4) On-line ceev slab dav hloov tshuab;

(5) Nruam cua sov thiab dov kub tswj tshuab;

(6) Kev tswj hwm lub computer thiab teem caij rau cov txheej txheem.

Raws li qhov sib txawv slab kub theem uas tuaj yeem tau txais, cov txheej txheem nruam casting-nruam dov-kev koom ua ke tuaj yeem muab faib ua:

(1) Tsawg-kub kub xa khoom ntawm nruam casting slab-reheating dov txheej txheem (los ntawm saum toj no);

(2) Nruam casting billet kub kub xa thiab ceev reheat dov txheej txheem (saum toj zoo heev);

(3) Nruam casting billet (plaub kaum cua sov) ncaj qha dov txheej txheem.

Lub nruam casting ncaj rolling tsim los ntawm Nippon Steel’s Sakai Plant siv electromagnetic induction ceev cua sov (ETC) kub them rau plaub fab ntawm high-temperature cam khwb cia slab, uas yuav ncaj qha dov mus rau hauv kub dov coils.

Loj-scale steel nroj tsuag nyob rau hauv kuv lub teb chaws (xws li Baosteel, thiab lwm yam.) uas tsim high-zoo daim hlau kuj ua tiav tiav ncaj kub dov ntawm nruam casting slabs.

Ze-net-shaped nruam casting (thin slab nruam casting) yog txheej txheem nruam nruam tshiab tsim nyob rau xyoo 1990. Txij li thaum nws yug los, nws tau raug tsim los ua ib txoj kab ntau lawm nrog ib lub tshuab dov tsis tu ncua. Thaum lub nruam casting billet tsis yog tag nrho solidified, lub teeb txo yuav ua tau nyob rau hauv internet, thiab qhov kub ntawm lub nruam casting billet yuav khaws cia saum toj no kab thaum nws nkag mus rau hauv lub dov zeb, uas yog, nws tsis tau undergone lub transformation ntawm austenite ( Y theem) rau ferrite (ib theem). Rolled rau hauv steel ntawv ncaj qha nyob rau hauv lub xeev ntawm thawj austenite theem. Cov kws tshawb fawb Suav tau pom tias cov hlau uas tsim los ntawm txoj kev no tsis tsim cov austenite thib ob thaum dov (a ^ 7) thiab qhov sib txuam redissolution ntawm dispersed precipitate theem, yog li cov phaj nyias ua los ntawm ze-net-puab nruam casting Precipitation hardening precipitates tau. ua nano-sized hais, uas muaj kev cuam tshuam zoo heev ntawm cov hlau zoo. kuv lub teb chaws tau tsim 12 cov kab ntau lawm rau nyias slab nruam casting, thiab cov zis txhua xyoo occupies ib tug tseem ceeb heev txoj hauj lwm nyob rau hauv lub ntiaj teb no.

Billet nruam casting yog qhov tseem ceeb ze-net-puab nruam casting. Nws tau tshawb fawb thiab tsim ua ntej, thiab tau siv tiav hauv xyoo 1960. Vim muaj kev txawj ntse thiab kev txawj ntse nyob rau hauv lub sij hawm ntawd, txias billet reheating dov feem ntau yog siv. kuv lub teb chaws tau txhawb nqa cov billet nruam casting tshuab hauv xyoo 1980s, ua ke nrog kuv lub teb chaws cov xwm txheej, ua ke nrog cov converters me me (30t) thiab high-speed hlau rods mills los tsim cov pa roj carbon steel ntev cov khoom kab, nrog cov khoom lag luam siab (ntau ntawm cov uas muaj ib xyoos ib zaug tso zis ntawm 1 lab tons los yog ntau tshaj)), nrog tsawg peev thiab muaj zog sib tw nyob rau hauv steel rau kev tsim kho. Qhov kev thov rau kev tsim steel hauv kuv lub teb chaws yog loj, thiab cov khoom lag luam ntev kuj tseem dav heev. Yog li ntawd, qhov no me me converter-billet nruam casting-high-speed hlau pas nrig zeb ntau lawm kab occupies ib tug txiav txim zoo ntawm kuv lub teb chaws cov hlau ntau lawm. Tsis tas li ntawd, billet nruam casting kuj tseem muaj qee qhov zoo hauv cov khoom siv hlau uas tsis tshua muaj hlau ntev (xws li pob bearing steel, steel rau machinery manufacturing). Txhawm rau txhim kho kev tsim khoom thiab txuag hluav taws xob, kev xa khoom kub thiab kev them nyiaj kub ntawm cam khwb cia slabs kuj tau them nyiaj ntau thiab ntau dua. Txawm li cas los xij, txwv rau tus qauv tsim, nws tsis yooj yim dua rau qhov kub thiab txias kom ncav cuag 700 RON, thiab yuav tsum tau ua ntau yam kev tiv thaiv kub. Lub reheating ntawm lub billet feem ntau yog siv roj-kub cua sov rauv. kuv lub teb chaws Zhenwu Hluav taws xob rauv Co., Ltd. npaj thiab tsim ib txoj kev rau on-line ceev cua kub ntawm cam khwb cia slabs los ntawm electromagnetic induction. Nws qhov zoo yog raws li nram no:

(1) Lub sijhawm cua sov ntawm lub tshuab hluav taws xob hauv lub tshuab hluav taws xob nruab nrab yog luv dua li lub sijhawm uas yuav tsum tau ua kom sov hauv cov nplaim taws, uas tsis tsuas yog pab txo cov hlau tsis zoo, tab sis kuj txhim kho qhov zoo ntawm cov cam khwb cia. slab thaum lub sij hawm dov txheej txheem;

(2) Siv hluav taws xob hluav taws xob induction cua sov, tsis muaj cov khoom siv hluav taws xob hauv cov cua sov, yog li ua kom tsis txhob oxidation thiab decarburization ntawm cov cam khwb cia, kom lub pob zeb huv si tuaj yeem tau los ntawm cov cua kub ceev no;

(3) Txij li thaum lub cua sov induction cua sov tsis muaj cov khoom siv hluav taws xob, nws yog ib puag ncig zoo thiab txo cov hluav taws xob hluav taws xob zoo heev;

(4) Lub tshuab cua sov induction tsis tsuas yog yooj yim dua, ceev thiab raug kom tswj tau qhov kub thiab txias, tab sis kuj tuaj yeem txuag hluav taws xob;

(5) Lub tshuab cua sov induction yog siv los ua kom sov lub billet, thiab cov khoom siv tu nqi tsawg dua li ntawm cov nplaim taws;

(6) Induction cua sov billets tuaj yeem ua kom sov super-ntev billets yooj yim dua, uas yog qhov txiaj ntsig kom paub txog qhov tsis muaj qhov kawg dov thiab txhim kho dov efficiency.