Cov khoom tseem ceeb ntawm Q690D steel phaj yog hlau, carbon, silicon, manganese, phosphorus, sulfur thiab lwm yam khoom. Ntawm lawv, cov ntsiab lus carbon yog siab, txog 0.12%-0.20%, uas ua rau Q690D muaj zog thiab hardness. Tsis tas li ntawd, Q690D kuj muaj qee yam ntawm cov ntsiab lus alloying, xws li silicon thiab manganese, uas tuaj yeem txhim kho lub zog thiab tawv ntawm cov phaj steel.
Q690D steel phaj muaj lub zog siab thiab hardness, nws lub zog tensile thiab lub zog tawm los tuaj yeem ncav cuag ntau dua 1000MPa thiab 800MPa feem. Nyob rau tib lub sijhawm, Q690D kuj muaj qhov zoo toughness thiab ductility, thiab nws elongation thiab cuam tshuam toughness siab. Cov khoom siv kho tshuab zoo heev no pab Q690D kom tau raws li ntau yam kev ua haujlwm nyuaj thiab xav tau.
Q690D steel phaj muaj qhov ntom ntawm li 7.85g / cm³ thiab qis thermal conductivity ntawm li 15W / (mK). Cov khoom siv lub cev no pab Q690D kom muaj kev ruaj ntseg zoo thiab nkag mus rau qhov kub thiab txias. Tsis tas li ntawd, Q690D muaj cov khoom siv hluav taws xob zoo thiab cov khoom ua haujlwm kub.
Q690D steel phaj muaj qhov zoo weldability thiab tuaj yeem txuas tau los ntawm ntau txoj kev vuam. Piv txwv li, cov txheej txheem welding muaj xws li hluav taws xob arc vuam, roj shielded vuam, laser vuam, thiab lwm yam.
