Hauv lub ntiaj teb niaj hnub nim no ntawm kev tsim kho vaj tse thiab kev tsim kho, kev xaiv hlau tsis yog qhov tsis muaj kev txwv. Ob ntawm cov hlau kub dov feem ntau yog cov hlau uas tau teev tseg -ASTM A572 Qib 50thiabASTM A992—tau tsim lawv tus kheej ua cov qauv kev lag luam rau cov haujlwm uas xav tau qhov sib npaug ntawm lub zog, ductility, thiab kev ntseeg tau.
ASTM A572 Qib 50 Cov Hlau Kub Dovyog ib lub phaj hlau uas muaj zog heev, tsis tshua muaj hlau sib xyaw uas siv dav hauv cov qauv siv, choj, thiab kev tsim khoom dav dav. Nws lub zog tso zis ntawm 50 ksi (345 MPa) thiab lub zog tensile xws li65–80 ksi (450–550 MPa)ua rau nws yog ib qho kev xaiv ntau yam rau cov engineers uas tab tom nrhiav kev ua tau zoo thiab kev siv nyiaj tsawg. Tsis tas li ntawd, ASTM A572 Qib 50 qhia tau tias muaj kev sib txuas zoo heev thiab kev ua tau zoo, uas ua rau muaj kev tsim khoom nyuaj yam tsis muaj kev cuam tshuam rau cov hlau txoj kev ncaj ncees. Kev sib xyaw ua ke ntawm lub zog, kev tawv, thiab kev tiv thaiv corrosion ua rau nws haum rau cov qauv hnyav, suav nrog cov tsev lag luam, cov tshuab platform, thiab cov khoom siv thauj mus los.
Nyob rau sab tes tod,ASTM A992 Cov Hlau Kub Dovtau dhau los ua cov khoom siv nyiam rau cov duab dav dav, tshwj xeeb tshaj yog hauv North America. Chiv thawj tsim los hloov ASTM A36 hauv cov duab qauv, A992 muaj qhov tsawg kawg nkaus ntawm 50 ksi (345 MPa), ua ke nrog kev tawv thiab ductility siab dua, ua rau nws zoo tagnrho rau cov qauv tiv taus av qeeg. A992 hlau kuj tseem muaj qhov zoo dua ntawm kev khoov thiab weldability, uas tso cai rau cov neeg tsim khoom kom ua tau raws li cov qauv tsim qauv nruj. Nws txoj kev siv dav hauv cov tsev lag luam, choj, thiab cov qauv kev lag luam yog qhov pov thawj rau nws qhov kev ua tau zoo tshaj plaws hauv ob qho tib si static thiab dynamic loading mob.
Txawm hais tias ob hom hlau sib koom ua ke lub zog nominal zoo sib xws, lawv tsis tuaj yeem hloov pauv tau hauv txhua daim ntawv thov. ASTM A572 Qib 50 feem ntau raug xaiv rau cov ntawv thov phaj uas xav tau kev txiav kev cai, kev siv tshuab, lossis kev hnav tsis kam hnyav, thaum ASTM A992 yog qhov zoo tshaj plaws rau cov duab qauv xws liI-beamsthiabH-beams, qhov twg qhov ruaj khov siab thiab ductility nyob rau hauv load yog qhov tseem ceeb. Kev xaiv cov hlau zoo yuav tsum xav txog qhov project qhov yuav tsum tau load, cov txheej txheem tsim khoom, thiab cov xwm txheej ib puag ncig.
Dhau li ntawm lawv cov khoom siv kho tshuab, ob qho tib siASTM A572 Qib 50 hlau phajthiabASTM A992 cov hlau phajyog tsim los ntawm cov txheej txheem dov kub siab heev. Kev dov kub ua rau cov hlau tuab sib npaug thiab du thaum ua kom cov hlau sab hauv zoo nkauj dua. Cov chaw tsim khoom niaj hnub siv cov tshuab dov uas tswj hwm los ntawm lub khoos phis tawj kom ntseeg tau tias muaj qhov ntev raug, ua rau cov phaj no sib xws nrog cov haujlwm tsim kho thiab kev tsim kho vaj tse siab.
Los ntawm qhov kev xav ua tau tiag tiag, cov engineers, cov neeg tsim khoom, thiab cov thawj coj saib xyuas qhov project feem ntau xav txog kev ntseeg tau thiab kev muaj nyob ntawm cov khoom xa tuaj thaum teev cov qib hlau. Cov neeg muag khoom loj muab cov phaj no rau ntau qhov tuab, dav, thiab ntev kom haum rau cov qauv tsim tshwj xeeb. Tsis tas li ntawd, ntau lub tuam txhab tsim khoom muab cov khoom txiav-rau-loj, ua ntej-drilled, lossis welded sib dhos, txo cov neeg ua haujlwm hauv qhov chaw thiab ua kom cov sijhawm ua haujlwm sai dua.
Xaus lus,ASTM A572 Qib 50Cov phaj hlau kub dovthiabASTM A992 Cov Hlau Kub Dovtxuas ntxiv mus ua tus txha nraub qaum ntawm kev tsim kho vaj tse niaj hnub. Txhua lub phaj muaj kev sib xyaw ua ke ntawm lub zog, kev ywj pheej, thiab kev ua haujlwm tau zoo, tsim rau kev tsim kho thiab kev tsim khoom tshwj xeeb. Txawm siv rau hauv cov choj, cov tsev lag luam, lossis cov platforms kev lag luam, kev xaiv cov hlau zoo ua kom muaj kev nyab xeeb, kev ruaj khov, thiab kev ua haujlwm ntev. Hauv kev lag luam uas qhov kev ua tau zoo thiab kev ua tau zoo tseem ceeb, ob lub phaj hlau no tseem yog cov kev daws teeb meem ntseeg siab rau cov engineers thoob ntiaj teb.
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