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Q345B steel yog ib tug Suav standardized low alloy, nruab nrab tensile lub zog steel ua nrog ib tug kub-dov txheej txheem, thiab yog siv rau ib tug xov tooj ntawm manufacturing lub hom phiaj. Nws yog cov hlau uas muaj tsawg dua 0.2 feem pua ntawm nws cov muaj pes tsawg leeg ua los ntawm carbon, tsawg dua 0.55 feem pua ntawm nws cov muaj pes tsawg leeg ua los ntawm silicon thiab ob peb impurities (feem ntau yog sulfur, chromium thiab nickel) . Cov qib tshwj xeeb ntawm cov hlau no yog 'lub hom phiaj dav dav' kev tsim cov hlau, siv rau cov ntawv hlau, lub teeb pom kev zoo ntawm cov khoom siv hauv tsev, thiab kev siv zoo sib xws uas nws yuav tsis siv los ua cov khoom siv loj.
Qhov txiaj ntsig tseem ceeb ntawm qib steel no yog nws qhov kub ntxhov. Nws yog ib qho yooj yim rau kev tsim thiab yooj yim rau welding, tso cai rau nws yuav siv tau los muab daim ntawv phaj ntawm lub qhov rooj, steel txee thiab sab nrauv ntawm cov khoom feem ntau. Muaj feem yuav yog, yog tias koj tau txais ib yam khoom nrog steel sab nrauv uas tau ua nyob rau hauv Suav teb, qhov no yog qib ntawm steel siv rau sab nraud ntawm nws. Nws yog kev sib xyaw ua ke ntawm tus nqi qis thiab kev siv yooj yim uas ua rau cov hlau no yuav luag txhua qhov chaw hauv cov khoom siv uas tsis muaj qhov hnyav tsis yog qhov kev txhawj xeeb loj.
Steel tensile zog yog qhia nyob rau hauv units ntawm quab yuam muab faib los ntawm cross sectional cheeb tsam; Hauv Metric system, chav tsev no hu ua Pascal. Ib tug Pascal yog ib tug Newton (lub zog yuav tsum tau ceev ib tug kilogram khoom mus rau ib tug ceev ntawm ib meter ib ob) ib square meter. Lub zog tensile ntawm Q345B steel yog nyob ntawm 470 txog 630 MegaPascals (qhov twg mega yog lab) thiab lub zog tawm los (qhov twg cov khoom pib nyias thiab rub zoo li taffy) ntawm 345 MegaPascals. Zoo li feem ntau steels ntawm nws qib, nws raug elongation ua ntej nws rub tawm, feem ntau ntawm 20-21 feem pua ntawm nws thawj qhov ntev.
