Low-alloy high-strength steel yeeb nkab (GB/T8162-2008)
Ntxiv rau qee qhov ntawm cov ntsiab lus ntawm silicon lossis manganese, cov kav dej zoo li no kuj muaj lwm cov ntsiab lus tsim nyog rau kuv lub teb chaws cov peev txheej. Xws li vanadium (V), niobium (Nb), titanium (Ti), txhuas (Al), molybdenum (Mo), nitrogen (N), thiab tsis tshua muaj ntiaj teb (RE) thiab lwm yam kab kawm. Raws li cov tshuaj muaj pes tsawg leeg thiab kev ua tau zoo, nws cov qib yog Q295A, B, Q345A, B, C, D, E, Q390A, B, C, D, E, Q420A, B, C, D, E, Q460C, D, E , thiab lwm yam steel qib txhais tau hais tias tib lub ntsiab lus raws li carbon structural steel yeeb nkab.
V, Nb, Ti, Al thiab lwm yam zoo-grained kab kawm. Nyob rau hauv xws li cov qauv steel kav, ntxiv rau qib A thiab B, tsawg kawg ib ntawm lawv yuav tsum muaj nyob rau hauv qib C, D, thiab E; txhawm rau txhim kho steel kev ua tau zoo, A thiab B qib steel kuj tuaj yeem muab ntxiv rau ib qho ntawm lawv. Tsis tas li ntawd, cov ntsiab lus seem ntawm Cr, Ni, thiab Cu ntawm cov hlau no tsis ntau tshaj 0.30%. Q345A, B, C, D, thiab E yog cov qib sawv cev ntawm cov hlau no, ntawm cov qib A thiab B feem ntau hu ua 16Mn; Cov yeeb nkab steel hlau saum toj no qib C yuav tsum tau ntxiv ntau tshaj ib txoj kab, thiab nws cov khoom siv kho tshuab ntxiv ib qho khoom siv hluav taws xob qis.
Hom qauv steel yeeb nkab yog piv nrog carbon structural steel. Nws muaj qhov zoo ntawm lub zog siab, kev ua haujlwm zoo, kev ua haujlwm ntev, kev siv ntau yam, thiab kev lag luam. Cov hlau feem ntau yog dov rau hauv daim hlau, ntu, seamless steel kav, thiab lwm yam, thiab yog dav siv nyob rau hauv txuas hniav, nkoj, boilers, tsheb thiab lub tsev tseem ceeb.
