Q690 yog ib qho qis-alloy high-strength steel qauv tsim los ntawm Q + tus lej + zoo qib cim + deoxidation qauv cim.
Lub "Q" hauv Q690 sawv cev rau cov ntsiab lus ntawm cov hlau, thiab "690" sawv cev rau cov txiaj ntsig taw tes tus nqi hauv MPa. Piv txwv li, Q690D sawv cev rau cov qauv hlau uas muaj kev ntxhov siab (σs) ntawm 690 MPa thiab qib D. Feem ntau siv qib Q690 yog D thiab E.
Txoj kev xa khoom muaj xws li kub dov, kub mechanical dov (TMCP), thiab quenching thiab tempering.
