Q345 yog ib yam ntawm cov hlau tsis tshua muaj hlau uas tau siv dav hauv cov txuas hniav, tsheb, nkoj, cov tsev, cov hlab ntsha siab, cov cuab yeej tshwj xeeb, thiab lwm yam, qhov "Q" txhais tau tias muaj zog tawm los, thiab 345 txhais tau tias lub zog ntawm cov hlau no yog 345MPa. . Kev sim ntawm q345 steel feem ntau suav nrog ...
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