Q345 steel yeeb nkab yog ib qho kev xaiv rau ntau qib steel xws li 12MnV, 14MnNb, 18Nb, 16MnRE, 16Mn, thiab lwm yam. Txawm hais tias nyob rau hauv cov nqe lus ntawm keeb kwm evolution, tus thawj ntawm Q345 yog raws li 16Mn qib hauv tus qauv YB{{8} ntawm Ministry of Metallurgy (uas tuaj yeem taug qab rov qab rau ST52 ntawm tus qauv German txawm tias ua ntej), nws cov tshuaj muaj pes tsawg leeg tsis zoo ib yam nrog 16Mn steel yeeb nkab.
16Mn steel belongs rau carbon-manganese steel, cov ntsiab lus ntawm cov pa roj carbon monoxide yog li ntawm 0.16%, yield point yog sib npaug rau 345MPa (lub zog theem belongs rau qib 345MPa). 16Mn steel muaj cov ntsiab lus tsis tshua muaj alloy, weldability zoo, thiab feem ntau tsis tas yuav preheat ua ntej vuam.
Q345 steel mechanical zog muaj xws li tensile lub zog, yield zog thiab elongation. Lub teb chaws tus qauv Q345B kub dov steel kauj, piv txwv li, nws cov khoom siv kho tshuab yog: tensile zog 470-630MPa, yield zog Ntau dua los yog sib npaug rau 345MPa, elongation Ntau dua lossis sib npaug li 20%.
Feem ntau, cov khoom siv kho tshuab dav dav thiab kev ua haujlwm kub qis ntawm Q345 steel zoo dua 16Mn steel, feem ntau nws tsis pom zoo kom siv 16Mn los hloov Q345.
