Nws yog ib qho tseem ceeb kom paub qhov txawv ntawm thawj txoj kev tsim khoom rau cov qauv duab thiab cov txheej txheem tsim khoom thib ob. Rau A572 H- kab teeb, qhov sib txawv tseem ceeb yog raws li hauv qab no:
Kub-Rolled A572 H-Beams (Tus Qauv): Qhov no yog qhov tshwj xeeb, universal txoj kev tsim cov duab W, S, thiab HP tau tham ntawm no. Cov txheej txheem yuav tsum tau cua kub ib tug loj steel billet (xws li, los ntawm lub nruam caster) mus rau ib tug yas lub xeev saum toj no 1700℃F (925 degree)-zoo tshaj nws recrystallization kub. Qhov no incandescent billet yog tom qab ntawd dhau mus dhau los ntawm cov txheej txheem ntawm contoured yob hauv cov qauv zeb, uas nyem thiab elongate nws mus rau qhov kawg H-profile. Qhov kub- txheej txheem dov no yog qhov tseem ceeb rau kev ua tiav cov khoom tshwj xeeb ntawm A572:
Grain Refinement: Kev sib xyaw ua ke ntawm deformation thiab recrystallization thaum lub sij hawm dov ua rau cov ntxhib xws li - nrum grain qauv, tsim kom zoo, zoo ib yam lis. Qhov no yog qhov tseem ceeb rau ob qho tib si lub zog thiab toughness.
Microalloy Activation: Qhov kub siab tso cai rau Columbium thiab Vanadium nyob twj ywm hauv kev daws. Thaum lub sij hawm tom qab tswj cov cua txias, lawv precipitate zoo li carbides / nitrides, muab cov dej nag tseem ceeb heev uas txhais tau tias A572.
Economy & Size: Tso cai rau kev tsim cov khoom loj heev, hnyav (xws li, W36 kab teeb) uas yuav tsis tuaj yeem ua kom txias.
Nto: Tawm tus yam ntxwv xiav -grey zeb nplai.
Txias-Formed/Cold-Ua Haujlwm Steel Tshooj (Ib yam khoom sib txawv): Cov no yog tsim los ntawm cov ntawv lossis cov khoom siv strip (xws li A1008 lossis A1011), feem ntau nyias nyias (xws li 0.06 txog 0.25 ntiv tes), ntawm chav sov. Daim ntawv tau dhau los ntawm ntau cov yob hauv yob- ua tshuab los khoov rau hauv cov duab xws li C- ntu, Z- ntu, thiab ntu kaus mom. Cov no tsis yog A572 H- kab teeb.
Khoom siv: Feem ntau ua los ntawm cov hlau sib txawv (piv txwv li, ASTM A1003 rau cov qauv CFS).
Cov txheej txheem cuam tshuam: Qhov txias- ua haujlwm (strain hardening) ua rau kom cov khoom muaj zog ntawm cov khoom tab sis txo nws cov ductility. Cov duab kawg muaj cov ces kaum ntse thiab du, nplai -dawb nto.
Daim ntawv thov: Siv rau lub teeb framing (studs, joists), purlins, girts, thiab hlau tsev -tsis yog rau thawj lub ntiajteb txawj nqus los yog lateral thav duab nyob rau hauv nruab nrab / siab- nce kev tsim kho.
Lub ntsiab lus tsis meej meej meej: Ib tus tsis xaj "txias- dov A572 W- nqaj." A572 cov duab yog kub- dov. Txias- ua hauj lwm tej zaum yuav tshwm sim raws li ib tug thib ob fabrication kauj ruam ntawm akub- dovA572 beam-piv txwv li, txias-bending beam rau lub camber, los yog xuas nrig ntaus qhov. Qhov txias hauv zos no- ua hauj lwm tsim ib qho nyuaj, tsis tshua muaj ductile cheeb tsam nyob rau hauv qhov chaw ua hauj lwm, uas yog suav rau hauv cov qauv tsim. Cov khoom siv hauv paus, txawm li cas los xij, tseem yog cov khoom kub- dov nrog cov as- dov A572 microstructure thiab cov khoom hauv thaj chaw tsis muaj kev cuam tshuam.