44130 muaj cov ntsiab lus carbon ntawm .28-.33 feem pua, manganese ntawm 0.70-0.85 feem pua, phosphorus ntawm 0.{{16} }35 feem pua. 4130 kuj muaj chromium thiab molybdenum, uas yog ob qho tib si siv nyob rau hauv quenching thiab temper txheej txheem muab 4130 nrog nws lub zog thiab toughness. 4150 muaj cov ntsiab lus carbon ntawm .28-.33 feem pua, manganese ntawm 0.70-0.85 feem pua, phosphorus ntawm 0.035 feem pua . 4150 kuj muaj leej faj, uas 4130 tsis muaj. 4150 yog siv rau cov ntawv thov uas xav tau lub zog siab thiab qhov hnyav tsawg xws li hauv cov khoom siv dav hlau, lub zog thiab cov ncej. 4150 muaj qhov toughness ntau dua li 4130 yog li nws tuaj yeem siv los ua cov khoom uas yuav tsum tau ua kom muaj zog ntau dua.
