Lub koom haum ntawm low-carbon steel ntawm chav tsev kub deformation ntawm ferrite thiab pearlite, yog hais tias muaj band qauv ntawm ferrite thiab pearlite alternating kab txaij lub koom haum.Tsawg carbon steel seamless yeeb nkab band qauv, los ntawm chav tsev kub mus rau normalizing kub, thaum lub kub ntawm Ac1, lub eutectoid transformation tshwm sim, pearlite transformation ntawm austenite.Nyob rau hauv cov ntaub ntawv no, lub Cheebtsam tsis homogeneous austenite, nrog rau cov cua kub kub tshaj Ac3, ferrite khoom tov tiav, ces cov qauv ntawm cov hlau yog hloov mus rau ib theem austenite, raws li qhov kub thiab txias mus rau normalizing kub incubation. austenite kiag li uniform.

Tso tawm los ntawm qhov normalizing kub txias Tom qab incubation, thaum lub txias npaum li cas ntawm cov hlau kom tshem tawm cov loj banded qauv nrog ib qho tseem ceeb txias tus nqi (xws li, suppression ferrite precipitate los ntawm lub austenite txias npaum li cas), cov steel yeeb nkab eutectoid ferrite lub cev yog suppressed, yog li ntawd lub ferrite tsis precipitate thiab tshem tawm cov kuab tshuaj nyob rau hauv lub austenite, thiab raws li qhov kub thiab txias txo los ntawm kev nce qib ntawm supercooling, thiab yuav tsis tshwm sim dua precipitated pro-eutectoid ferrite, los ntawm ncaj qha supercooled austenite decomposition khoom rau hauv eutectoid ferrite + cementite, tab sis tsis zoo li eutectoid. steel muaj pes tsawg leeg, hu ua "pseudo-eutectoid" vim hais tias "pseudo-eutectoid" tsis muaj eutectoid ferrite lub neej ntawm lub cev, yog li lub microstructure ntawm steel banded qauv tsis muaj nyob.Cov yeeb nkab rwb thaiv tsev los ntawm ci tom qab normalizing kub, qhov cua txias yog tsawg dua cov qauv ntawm cov hlau kom tshem tawm qhov tseem ceeb ntawm cov cua txias qeeb, thaum qhov kub thiab txias yog txo rau Ac3, thawj depleted carbon steel austenitic ferritic nag lossis daus ua ntej (Cov pa roj carbon. -Cov cheeb tsam tsis zoo ntawm cov niam txiv theem txog cov qauv band), nrog rau qhov qis qis qis thiab qhov kub thiab txias eutectoid ferrite ntim tau maj mam nce mus txog qhov txias rau Ac1 thaum austenite rau hauv pearlite, nyob rau hauv chav tsev kub Lub microstructure ntawm cov hlau, nws tshwm ferrite thiab pearlite bands. banded tib lub koom haum.