Raws li cov txheej txheem tsim, seamless yeeb nkab yuav muab faib ua kub dov seamless steel raj thiab txias-draw seamless steel yeeb nkab ob yam. Cold drawn tube kuj muab faib ua cov yeeb nkab thiab cov yeeb nkab zoo li tus.
Kub dov yog txheeb ze rau qhov txias-dov, txias dov yog qis dua qhov kub ntawm recrystallization ntawm dov, thiab kub dov yog nqa tawm ntawm qhov kub ntawm recrystallization ntawm dov.
Kub dov seamless steel yeeb nkab tuaj yeem ua rau cov cam khwb cia microstructure ntawm steel ingot, refinement ntawm cov khoom siv lead ua ntawm cov hlau, thiab tshem tawm qhov tsis xws ntawm microstructure, kom lub koom haum steel compacting, txhim kho cov khoom siv kho tshuab. Qhov kev txhim kho no tau pom nyob rau hauv cov kev taw qhia dov, yog li ntawd cov hlau tsis yog nyob rau qee yam isotropic; nchuav cov tsim npuas, tawg, thiab pob txha pob txha, nyob rau hauv qhov kub thiab txias kuj tseem tuaj yeem welded ua ke.
1. Tom qab kub dov, cov nonmetallic inclusions nyob rau hauv lub sab hauv ntawm ib tug hlau (tsuas yog sulfides thiab oxides, raws li zoo raws li cov silicate) raug nias rau hauv ib daim ntawv, stratified (laminated) tshwm sim. Cov txheej txheem ntawm cov hlau nyob rau hauv thickness kev taw qhia los ntawm kev rub kev ua tau zoo heev, thiab tej zaum yuav tshwm sim nyob rau hauv lub weld shrinkage interlayer tsim kua muag. Weld shrinkage induced hauv zos strain feem ntau ncav cuag ob peb lub sij hawm lub yield point strain, lub strain yog ntau ntau tshaj qhov load tshwm sim;
2. Kev ntxhov siab uas tshwm sim los ntawm qhov tsis sib xws. Qhov seem kev ntxhov siab yog qhov kev ntxhov siab ntawm sab hauv tus kheej-theem equilibrium nyob rau hauv qhov tsis muaj kev quab yuam sab nraud, cov kub dov steel ntawm ntau yam ntoo khaub lig-sectional muaj ib qho kev ntxhov siab seem xws li feem ntau steel sectional dimension yog qhov ntau dua, qhov ntau dua qhov residual stresses. Residual stress yog tus kheej-theem equilibrium, tab sis cov tswv cuab steel nyob rau hauv kev ua tau zoo sab nraud quab yuam los yog muaj tej yam kev cuam tshuam. Xws li deformation, stability, los tiv thaiv qaug zog yuav adversely.
3. Cov khoom kub-kuav los tiag steel, tsis zoo tswj cov thickness thiab ntug dav. Peb paub txog cov thermal expansion thiab contraction, txawm tias qhov pib ntawm qhov kub-dov tawm yog cov qauv ntev, tuab, los yog yuav muaj qee qhov tsis zoo kawg tom qab txias, qhov kev sib txawv tsis zoo ntawm ntug dav dav ntawm qhov nce thickness ntawm kev ua tau zoo pom tseeb dua.
Cold dov seamless kav yog txias los yog txias dov precision seamless steel kav nrog cov neeg siab ntawm qhov ntev thiab zoo tiav ntawm qhov chaw siv rau cov tshuab thiab cov khoom siv hydraulic. Cov txheej txheem txias dov yog hais txog cov txheej txheem tau txais los ua cov ntawv hlau lossis cov hlua khi rau hauv ntau hom steel khoom los ntawm cov txheej txheem ua haujlwm txias xws li txias khoov thiab cov txheej txheem txias. Cov kav dej txias seamless tsis tsuas yog suav nrog cov kav hlau dav dav, qis thiab nruab nrab siab boiler steel kav, siab siab boiler steel kav, alloy steel kav, stainless hlau kav, roj av cracking steel kav, tab sis kuj muaj xws li carbon steel kav nrog nyias phab ntsa, hlau alloy steel. cov kav dej nrog cov phab ntsa nyias, cov kav hlau tsis muaj steel nrog cov phab ntsa nyias thiab cov kav hlau tshwj xeeb zoo li cov kav dej. Cov kav dej kub dov seamless feem ntau muaj cov kab uas hla sab nraud loj dua 32 hli thiab phab ntsa tuab ntawm 2.5mm txog 75mm; cov kav dej txias txias seamless feem ntau muaj cov kab sab nraud tsawg dua 6 hli thiab phab ntsa thickness tsawg dua 0.25 hli; cov kav dej nyias-phab ntsa feem ntau muaj cov kab sab nraud tsawg dua 5mm thiab phab ntsa thickness tsawg dua 0.25mm. Cov kav dej txias txias feem ntau muaj qhov tseeb qhov tseeb dua li cov kav dej kub dov.
