4140 asye wonn (ASTM A29) gen yon konpozisyon nan 0.38-0.43% kabòn (C), 0.75-1.00% Manganèz (MN), 0.15-0.30% Silisyòm (SI), 0.80-1.10% CHROMIUM (CR), 0.15-0.25% MOLYBDEN (MON. (P), ak mwens pase oswa egal a 0.040% souf (s).
42CRMO4 wonn asye (EN 10083-3) se prèske ki idantik men li gen ajisteman minè: 0.38-0.45% kabòn (C), 0.60-0.90% Manganèz (MN), 0.15-0.35% Silisyòm (SI), 0.90-1.20% Chromium (Cr), 0.15-0-0-0-0-0- fosfò (P), ak mwens pase oswa egal a 0.035% souf (yo).
Resanblans yo vle di tou de asye gen karakteristik chimik ki konparab: CHROMIUM (0.80-1.20%) amelyore hardenability ak fòm karbid CHROMIUM pou rezistans mete, pandan y ap molibden (0.15-0.30%) amelyore segondè - estabilite chimik tanperati pa ralanti carbure coarsening. Diferans yo se sibtil men impactful: 42Crmo4 a pi wo CHROMIUM (0.90-1.20% vs . 0.80 - 1.10%) yon ti kras ranfòse rezistans oksidasyon, pandan y ap pi ba souf li yo (mwens pase oswa egal a 0.035% vs. (0.75-1.00% vs . 0.60 - 0.90%) Marginal amelyore deoxidation men li gen ti efè sou long - tèm pèfòmans chimik. Tou de klas yo konte sou kabòn (0.38-0.45%) pou ranfòse, ak nivo balanse pou fè pou evite twòp fragilite.