Q690D yog ib hom siab- lub zog steel phaj nrog lub zog zoo heev, tawv thiab hnav- cov khoom tiv taus, uas yog siv dav hauv kev tsim kho, tshuab, nkoj, tsheb thiab lwm yam haujlwm. Q690D siab zog steel phaj yuav qhia hauv qab no.
I. Q690D muaj pes tsawg leeg thiab qauv
Cov tshuaj muaj pes tsawg leeg ntawm Q690D feem ntau suav nrog carbon, silicon, manganese, phosphorus, sulfur thiab lwm yam. Ntawm lawv, cov pa roj carbon yog cov ntsiab lus tseem ceeb uas cuam tshuam rau lub zog thiab lub zog ntawm cov hlau, silicon thiab manganese tuaj yeem txhim kho lub zog thiab hardness ntawm cov hlau, thaum phosphorus thiab sulfur muaj kev cuam tshuam rau lub toughness thiab corrosion kuj ntawm hlau.
Lub microstructure ntawm Q690D feem ntau yog tsim los ntawm ferrite, pearlite thiab ib qho me me ntawm bainite. Ferrite yog lub ntsiab tseem ceeb ntawm cov hlau, nrog zoo toughness thiab plasticity; pearlite yog txheej txheej txheej txheej ntawm ferrite thiab carbide, muaj zog thiab hardness; bainite yog ib lub koom haum tshwj xeeb tsim los ntawm carbide hauv ferrite, nrog zoo toughness thiab hardness.
2, Q690D txhua yam khoom
Q690D siab- lub zog steel phaj muaj cov khoom siv zoo heev, nws lub zog tensile txog li 690MPa lossis ntau dua, cov ntsiab lus tawm ntawm 550MPa lossis ntau dua, elongation ntawm 18% lossis ntau dua. Nyob rau tib lub sijhawm, nws kuj muaj kev cuam tshuam zoo, thiab tuaj yeem raug stamped, khoov thiab lwm yam kev ua haujlwm ntawm qhov kub thiab txias. Tom qab kev kho cua sov, nws cov khoom siv kho tshuab tuaj yeem txhim kho ntxiv.
3, Q690D lub cev muaj zog
Q690D siab- lub zog steel phaj muaj qhov ntom ntom ntawm 7.85g / cm³, nrog cov thermal conductivity zoo thiab coefficient ntawm thermal expansion. Nws cov thermal conductivity yog li 15W / (m{5}}K), thiab nws coefficient ntawm thermal expansion yog li 12 × 10^-6 / K. Cov khoom no muab nws zoo seem stability ntawm qhov kub thiab txias. Tsis tas li ntawd, Q690D muaj cov hlau nplaum zoo thiab cov khoom siv hluav taws xob, uas tuaj yeem siv los tsim cov khoom uas xav tau cov khoom siv hluav taws xob siab.
