Kub Rolled, Cold Rolled & Pickled

Kub dov

Kub dov yog txheeb ze rau txias dov, uas yog dov hauv qab qhov kub ntawm recrystallisation, thaum kub dov yog dov saum toj no lub recrystallisation kub.

Qhov zoo:

Muaj peev xwm rhuav tshem cov casting ntawm steel ingots, refining lub grain ntawm steel, thiab tshem tawm microstructural defects, thiaj li hais tias lub koom haum steel yog ntom, mechanical zog yog zoo dua.Qhov kev txhim kho no feem ntau yog nyob rau hauv cov kev taw qhia ntawm dov, kom cov hlau tsis muaj isotropic rau ib yam twg;npuas, tawg thiab looseness tsim thaum lub sij hawm casting kuj yuav welded ua ke nyob rau hauv kub thiab siab.

Qhov tsis zoo:

1. Tom qab kub dov, cov non-metallic inclusions nyob rau hauv cov hlau (tsuas yog sulphides thiab oxides, thiab silicates) yog nias rau hauv nyias daim ntawv thiab delamination (lamination) tshwm sim.Delamination zoo heev deteriorates cov khoom ntawm cov hlau nyob rau hauv nro raws thickness kev taw qhia, thiab muaj kev pheej hmoo ntawm interlaminar tearing thaum weld shrinkage.Cov kab mob hauv zos uas raug cuam tshuam los ntawm weld shrinkage feem ntau ncav cuag ob peb zaug ntawm qhov taw tes tawm los thiab muaj ntau dua li qhov cuam tshuam los ntawm kev thauj khoom.

2. Cov kev ntxhov siab uas tshwm sim los ntawm qhov tsis sib xws.Residual stresses yog nyob rau hauv tus kheej-ntsuas kev nyuaj siab nyob rau hauv tsis muaj lwm yam quab yuam, ntau seem ntawm kub dov steel muaj xws li residual stresses, feem ntau qhov loj ntawm seem loj ntawm cov hlau, qhov ntau dua cov residual stresses.Txawm hais tias cov kev ntxhov siab uas seem yog qhov ntsuas tus kheej, lawv tseem muaj kev cuam tshuam rau kev ua haujlwm ntawm cov tswv cuab steel nyob rau hauv sab nraud rog.Xws li deformation, stability, qaug zog tiv thaiv thiab lwm yam yuav muaj kev cuam tshuam tsis zoo.

3. Cov khoom kub-kuav los tiag steel tsis yooj yim rau kev tswj ntawm cov thickness thiab ntug dav.Peb paub txog thermal expansion thiab contraction, raws li qhov pib ntawm qhov kub dov tawm txawm tias qhov ntev thiab tuab yog raws li tus qauv, qhov kawg txias yuav tseem tshwm sim qhov txawv tsis zoo, qhov dav ntawm qhov tsis zoo ntawm qhov dav, qhov tuab ntawm qhov kev ua tau zoo. ntawm qhov pom tseeb dua.Qhov no yog vim li cas nws tsis yooj yim sua kom meej meej txog qhov dav, thickness, ntev, lub kaum sab xis thiab ntug kab ntawm cov hlau loj.

 

Txias dov

Dov hauv qab qhov ntsuas kub recrystallisation yog hu ua txias dov, feem ntau yog siv cov kub dov steel coils raws li raw khoom, tom qab pickling kom tshem tawm oxidation ntawm daim tawv nqaij rau txias tas mus li dov, cov khoom tiav yog dov hard coil, vim tsis tu ncua txias deformation los ntawm txias ua hauj lwm hardening dov. nyuaj coil lub zog, hardness, toughness thiab yas ntsuas poob, yog li cov stamping kev ua tau zoo yuav deteriorate, tsuas yog siv tau yooj yim deformation ntawm qhov chaw.Cold dov feem ntau yog annealed.

Hard dov coils yuav siv tau raws li raw khoom nyob rau hauv kub dip galvanizing nroj tsuag, raws li kub dip galvanizing units yog nruab nrog annealing kab.

Rolled hard coils feem ntau hnyav 20-40 tonnes thiab cov coils txuas ntxiv dov nyob rau hauv chav tsev kub tiv thaiv kub dov pickled coils.

Cov yam ntxwv ntawm cov khoom: Vim nws tsis yog annealed, nws hardness yog heev thiab nws machinability yog tsis tshua muaj neeg pluag, yog li nws tsuas yog bent nyob rau hauv ib tug yooj yim kev taw qhia tsawg tshaj li 90 degrees (perpendicular mus rau lub yob orientation).Nyob rau hauv cov ntsiab lus yooj yim, txias dov yog txheej txheem ntawm dov los ntawm lub hauv paus ntawm kub dov coils, uas feem ntau yog txheej txheem ntawm kub dov - pickling - phosphating - saponification - txias dov.

Cold-dov yog ua tiav los ntawm cov ntawv kub-dov nyob rau hauv chav tsev kub, txawm hais tias nyob rau hauv cov txheej txheem vim dov kuj yuav ua rau cov hlau phaj sov, tab sis txawm li cas los xij hu ua txias-dov.Raws li cov kub dov tom qab tas li txias deformation thiab txias dov nyob rau hauv lub mechanical zog ntawm cov neeg pluag, nyuaj heev, yog li yuav tsum tau annealed los kho nws cov neeg kho tshuab zog, tsis muaj annealing hu ua dov nyuaj ntim.Rolled hard rolls feem ntau yog siv los ua yam tsis muaj dabtsi yog khoov, ncab cov khoom, 1.0 hauv qab lub thickness ntawm dov nyuaj hmoov zoo dabtsi yog khoov ntawm ob sab los yog plaub sab.

Hauv cov txheej txheem txias dov yuav tsum siv cov roj dov txias, cov txiaj ntsig ntawm kev siv cov roj dov txias yog:

1.Ua kom txo tau cov coefficient ntawm kev sib txhuam, muab qhov sib thooj dov quab yuam, dov qis zog noj, kom tau txais kev txaus siab dov tsis;

2. Muab qhov ci ntsa iab siab, dov qeeb thickness uniform;

3.Cov nyhuv txias txias, tuaj yeem tshem tawm cov cua sov sai sai, tiv thaiv cov yob thiab dov qhov chaw.Kev ua haujlwm zoo annealing, yuav tsis tsim cov roj hlawv tshwm sim;

4.Nws muaj lub sijhawm luv luv los tiv thaiv xeb, tuaj yeem muab kev tiv thaiv xeb ib ntus rau dov qhov chaw.

Qhov txawv ntawm txias-kuav los tiag thiab kub-kuav los tiag:

1.Cqub dov tsim steel tso cai rau lub zos buckling ntawm tus ntoo khaub lig-section kom lub load-bearing muaj peev xwm ntawm lub bar tom qab buckling yuav siv tau tag nrho;whereas kub dov seem tsis pub lub zos buckling ntawm tus ntoo khaub lig-section tshwm sim.

2. Hot-rolled seem thiab txias-dov seem ntawm steel residual kev nyuaj siab generated los ntawm txawv yog vim li cas, yog li qhov kev faib ntawm tus ntoo khaub lig-section kuj txawv heev.Kev faib tawm ntawm cov kev ntxhov siab nyob rau hauv qhov sib txawv ntawm qhov sib txawv ntawm qhov txias-tsim nyias-walled seem yog dabtsi yog khoov hom, thaum qhov kev faib tawm ntawm qhov seem ntawm qhov kev ntxhov siab nyob rau hauv cross-section ntawm kub dov los yog welded seem yog hom zaj duab xis.

3.Tnws dawb torsional nruj ntawm cov khoom kub-kuav los tiag yog siab dua li ntawm cov khoom txias-kuav los tiag, yog li qhov torsional tsis kam ntawm cov khoom kub-kuav los tiag yog zoo dua li cov khoom txias-dov.