Kub-kuav los tiag puag ncig cov hlau muaj ntau qhov zoo xws li zoo hardenability, siab hardness, zoo hnav tsis kam, thiab kev kho cua sov me me deformation. Nws feem ntau siv los ua cov pwm txias ua haujlwm nrog lub nra hnyav, cov khoom loj loj ntau lawm, thiab cov duab duab tsis yooj yim. Txawm li cas los xij, Q345B tsawg-alloy round steel yog nquag rau cov teeb meem xws li siab tawg thaum lub sijhawm siv. Cov kev tshawb fawb pom tau tias kev txhim kho ntawm morphology thiab faib cov carbides hauv Q345B tsawg-alloy round steel tuaj yeem txhim kho cov khoom siv tawv.
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