4130 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 lub quench 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. 4150 kuj yog corrosion resistant piv rau 4130 uas ua rau 4150 tsis tshua muaj rusting tom qab fabrication rau hauv qhov chaw. 4340 muaj cov ntsiab lus carbon ntawm .38-.43 feem pua, manganese ntawm 0.70-0.85 feem pua, phosphorus ntawm .035 feem pua . 4340 kuj muaj leej faj, uas 4130 tsis muaj. 4340 yog siv rau cov ntawv thov uas xav tau lub zog siab thiab hnav tsis kam xws li hauv cov khoom siv dav hlau, lub zog thiab cov ncej. 4340 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. 4340 kuj yog corrosion resistant piv rau 4130 uas ua rau 4150 tsis tshua muaj rusting tom qab fabrication rau hauv qhov chaw.
