Qhov cuam tshuam ntawm cov khoom siv tshuaj rau cov khoom ntawm cov hlau phaj
Hlau-carbon alloy nrog cov ntsiab lus carbon tsawg dua 2.11% yog hu ua hlau.Sib nrug los ntawm cov khoom siv tshuaj xws li hlau (Fe) thiab carbon (C), hlau kuj tseem muaj me me ntawm silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), oxygen (O), nitrogen ( N), niobium (Nb) thiab titanium (Ti) Kev cuam tshuam ntawm cov tshuaj lom neeg ntawm cov khoom steel yog raws li hauv qab no:
1. Cov pa roj carbon (C): Nrog kev nce ntawm cov ntsiab lus carbon hauv cov hlau, cov khoom muaj zog thiab tensile zog nce, tab sis cov yas thiab qhov cuam tshuam lub zog txo;Txawm li cas los xij, thaum cov ntsiab lus carbon ntau tshaj 0.23%, qhov vuam-muaj peev xwm ntawm steel deteriorates.Yog li ntawd, cov ntsiab lus ntawm cov hlau tsis tshua muaj hlau siv rau vuam feem ntau tsis tshaj 0.20%.Qhov nce ntawm cov ntsiab lus carbon yuav kuj txo cov atmospheric corrosion kuj ntawm hlau, thiab siab carbon steel yog yooj yim rau corrode nyob rau hauv qhib cua.Tsis tas li ntawd, carbon tuaj yeem ua rau kom txias brittleness thiab aging rhiab heev ntawm steel.
2. Silicon (Si): Silicon yog lub zog deoxidizer hauv cov txheej txheem steel, thiab cov ntsiab lus ntawm silicon hauv cov hlau tua feem ntau yog 0.12% -0.37%.Yog tias cov ntsiab lus ntawm silicon hauv cov hlau ntau tshaj 0.50%, silicon hu ua alloying element.Silicon tuaj yeem txhim kho qhov kev txwv tsis pub muaj zog, tawm dag zog thiab lub zog tensile ntawm cov hlau, thiab tau dav siv los ua lub caij nplooj ntoos hlav steel.Ntxiv 1.0-1.2% silicon rau hauv cov quenched thiab tempered structural steel tuaj yeem ua kom lub zog los ntawm 15-20%.Ua ke nrog silicon, molybdenum, tungsten thiab chromium, nws tuaj yeem txhim kho corrosion thiab oxidation tsis kam, thiab tuaj yeem siv los tsim cov hlau tsis muaj cua sov.Cov pa roj carbon tsawg uas muaj 1.0-4.0% silicon, nrog kev sib nqus permeability siab heev, yog siv los ua hluav taws xob hlau hauv kev lag luam hluav taws xob.Qhov nce ntawm cov ntsiab lus ntawm silicon yuav txo qhov vuam-muaj peev xwm ntawm cov hlau.
3. Manganese (Mn): Manganese yog ib qho zoo deoxidizer thiab desulfurizer.Feem ntau, hlau muaj 0.30-0.50% manganese.Thaum ntau tshaj 0.70% manganese ntxiv rau carbon steel, nws hu ua "manganese steel".Piv nrog rau cov hlau zoo tib yam, nws tsis tsuas yog muaj zog txaus, tab sis kuj muaj zog dua thiab hardness, uas txhim kho harden-muaj peev xwm thiab kub ua hauj lwm-muaj peev xwm ntawm steel.Cov hlau uas muaj 11-14% manganese muaj qhov hnav tsis kam, thiab feem ntau yog siv rau hauv excavator thoob, pob zeb liner, thiab lwm yam. Nrog rau qhov nce ntawm manganese cov ntsiab lus, corrosion kuj ntawm hlau tsis muaj zog thiab vuam kev ua tau zoo yog txo.
4. Phosphorus (P): Feem ntau hais lus, phosphorus yog ib qho teeb meem hauv cov hlau, uas txhim kho lub zog ntawm cov hlau, tab sis txo cov plasticity thiab toughness ntawm hlau, ua rau kom txias brittleness ntawm hlau, thiab deteriorates lub vuam kev ua tau zoo thiab txias dabtsi yog khoov kev ua tau zoo. .Yog li ntawd, nws yog feem ntau yuav tsum tau phosphorus cov ntsiab lus nyob rau hauv steel yog tsawg tshaj li 0.045%, thiab qhov yuav tsum tau ntawm high-zoo steel yog tsawg.
5. Sulfur (S): Sulfur kuj yog ib qho teeb meem nyob rau hauv ib txwm muaj xwm txheej.Ua kom cov hlau kub nkig, txo cov ductility thiab toughness ntawm cov hlau, thiab ua rau tawg thaum lub sij hawm forging thiab dov.Sulfur kuj tseem cuam tshuam rau vuam kev ua tau zoo thiab txo corrosion kuj.Yog li, cov ntsiab lus sulfur feem ntau tsawg dua 0.055%, thiab cov hlau zoo yog tsawg dua 0.040%.Ntxiv 0.08-0.20% sulfur rau hlau tuaj yeem txhim kho mach-inability, uas feem ntau hu ua dawb-txiav steel.
6. Aluminium (Al): Aluminium yog ib qho kev siv deoxidizer hauv cov hlau.Ntxiv ib qho me me ntawm txhuas rau cov hlau tuaj yeem ua kom zoo dua cov nplej loj thiab txhim kho kev cuam tshuam toughness;Aluminium kuj muaj oxidation kuj thiab corrosion kuj.Kev sib xyaw ua ke ntawm txhuas nrog chromium thiab silicon tuaj yeem txhim kho qhov kub-kub tev kev ua tau zoo thiab kub-kub corrosion tsis kam ntawm hlau.Qhov tsis zoo ntawm txhuas yog tias nws cuam tshuam rau kev ua haujlwm kub, kev ua haujlwm vuam thiab kev ua haujlwm ntawm cov hlau.
7. Cov pa oxygen (O) thiab nitrogen (N): Cov pa oxygen thiab nitrogen yog cov khoom tsim kev puas tsuaj uas tuaj yeem nkag tau los ntawm lub cub tawg thaum cov hlau yaj.Oxygen tuaj yeem ua rau cov hlau kub nkig, thiab nws cov nyhuv yog qhov hnyav dua li cov sulfur.Nitrogen tuaj yeem ua kom txias brittleness ntawm hlau zoo ib yam li cov phosphorus.Cov nyhuv laus ntawm nitrogen tuaj yeem ua rau muaj zog thiab lub zog ntawm cov hlau, tab sis txo cov ductility thiab toughness, tshwj xeeb tshaj yog nyob rau hauv cov ntaub ntawv ntawm deformation laus.
8. Niobium (Nb), vanadium (V) thiab titanium (Ti): Niobium, vanadium thiab titanium yog tag nrho cov nplej refining.Ntxiv cov ntsiab lus tsim nyog tuaj yeem txhim kho cov qauv hlau, ua kom zoo dua cov nplej thiab txhim kho lub zog thiab tawv ntawm cov hlau.
