Q355D yog ib hom uas tsis muaj alloy high-strength structural steel phaj, uas yog tsuas yog siv rau kev tsim ntau yam engineering lug thiab mechanical khoom.
Cov tshuaj muaj pes tsawg leeg ntawm Q355D steel phaj feem ntau suav nrog carbon, silicon, manganese, phosphorus, sulfur, chromium, tooj liab, molybdenum thiab lwm yam khoom. Ntawm lawv, cov ntsiab lus ntawm C, Si, Mn, P thiab S yog 0.18% rau 0.28%, 0.15% rau 0.5 0%, 1.20% rau 1.60%, Tsawg dua lossis sib npaug rau 0.030% thiab Tsawg dua lossis sib npaug rau 0.030%, thiab cov ntsiab lus ntawm Cr, Cu thiab Mo yog 0.20% mus rau 0.30%, 0.20% rau 0.50%, 0.15% rau 0.30% feem. Kev sib koom ua ke ntawm cov ntsiab lus no ua rau Q355D steel phaj muaj cov khoom siv zoo thiab corrosion kuj.
Q355D steel phaj muaj cov khoom siv zoo heev, nrog cov khoom muaj zog thiab lub zog tensile, nrog rau zoo plasticity thiab toughness. Feem ntau, lub zog tawm ntawm Q355D steel phaj yog li ntawm 270 txog 380 MPa, lub zog tensile thaj tsam ntawm 420 txog 550 MPa, qhov elongation Ntau dua lossis sib npaug li 21%, thiab qhov cuam tshuam toughness Ntau dua lossis sib npaug li 47 J / cm. ^2. Cov cuab yeej cuab tam no ua kom muaj kev ntseeg siab ntawm Q355D steel phaj hauv ntau daim ntawv thov engineering.
Q355D steel phaj muaj qhov zoo corrosion kuj thiab tuaj yeem siv rau ntau qhov chaw corrosive. Nws qhov kev tiv thaiv corrosion feem ntau yog nyob ntawm cov tshuaj muaj pes tsawg leeg thiab kev kho saum npoo ntawm cov hlau phaj. Txij li Q355D steel phaj muaj qee qhov nyiaj ntawm chromium, qhov no yuav pab txhim kho nws cov corrosion kuj hauv oxidising media. Tsis tas li ntawd, yog tias yuav tsum muaj kev tiv thaiv corrosion ntau dua, kev kho deg xws li galvanization thiab chromium plating tuaj yeem siv rau cov phaj steel los txhim kho nws cov corrosion kuj.
Q355D steel phaj yog dav siv nyob rau hauv ntau yam engineering lug, xws li txuas hniav, siab hlab ntsha, cia tank, pipelines thiab thiaj li nyob. Vim nws lub zog siab thiab zoo corrosion kuj, Q355D steel phaj tau dhau los ua ib qho ntawm cov khoom tseem ceeb hauv petrochemical, lub zog thiab lub zog, kev thauj mus los thiab lwm yam. Tsis tas li ntawd, nws kuj tau siv dav hauv kev tsim vaj tsev, xws li cov tsev siab siab, txuas hniav, thiab lwm yam, kom ua tau raws li qhov xav tau ntawm lub zog siab thiab corrosion kuj.
