20 # belongs rau cov pa roj carbon zoo tsawg, txias extrusion, carburizing hardened hlau. Cov hlau tsis muaj zog, zoo toughness, plasticity thiab weldability. Tensile zog ntawm 253-500MPa, elongation Ntau dua los yog sib npaug li 24%.
No. 20 steel ntawm 20 yog hais txog cov ntsiab lus carbon ntawm 0.2%, belongs rau cov pa roj carbon tsawg. Cov hlau tuaj yeem muab faib ua cov pa roj carbon tsawg, nruab nrab carbon steel thiab siab carbon steel.
Cov ntsiab lus carbon: qis carbon steel feem ntau tsawg dua {{0}}.25%; nruab nrab carbon steel feem ntau yog nyob nruab nrab ntawm 0.25 thiab 0.60%; siab carbon steel feem ntau ntau dua 0.60%.
Hlau ntxiv rau carbon (C) cov ntsiab lus thiab rau deoxidation thiab muaj qee qhov nyiaj ntawm silicon (Si) (feem ntau tsis ntau tshaj {{0}}}.40%), manganese (Mn) (feem ntau tsis ntau tshaj 0.80%, siab dua tuaj yeem ncav cuag 1.20%) alloying ntsiab lus, tsis muaj lwm yam alloying ntsiab (tshwj tsis yog cov khoom seem).
20# steel phaj siv cov qauv: kev ua raws li GB/T711-2017 tus qauv.
Siv: haum rau kev tsim cov tsheb, tsheb laij teb thiab kev lag luam kev lag luam dav dav hauv kev tsim kho ntawm qhov tseem ceeb me me thiab nruab nrab carburizing carbonitriding thiab lwm qhov chaw, xws li tsheb tes nres khau, qib ncej, kis ceev diav rawg, kis tau tus mob passive zog thiab tsheb laij teb camshafts, ncua kev kawm ntawv equalizer shafts, equalizers sab hauv thiab sab nraum lub bushings, thiab lwm yam.; nyob rau hauv lub kub dov los yog normalized lub xeev rau kev tsim khoom ntawm lub zog tsis loj, tab sis yuav tsum muaj siab toughness ntawm ntau yam mechanical qhov chaw; nyob rau hauv hnyav, hnyav machinery manufacturing kev lag luam, xws li forged los yog nias khi rods, hooks thiab rings, levers, tes tsho, fixtures thiab thiaj li nyob. Nyob rau hauv lub turbine thiab boiler manufacturing kev lag luam rau siab Less tshaj los yog sib npaug zos rau 6N / square, kub tsawg dua los yog sib npaug zos rau 450 degree non-corrosive xov xwm ua hauj lwm nyob rau hauv cov yeeb nkab, flange, coupling box thiab ntau yam fasteners; nyob rau hauv txoj kev tsheb ciav hlau, dov Tshuag siv nyob rau hauv kev tsim cov crossheads, pistons thiab lwm yam castings.
