Karfe Za'a iya raba bakin karfe mai ƙarancin carbon, matsakaici carbon karfe da babban carbon karfe. Rashin ƙwayar carbon - abun ciki na carbon yana ƙasa da 0.25%; Matsakaici Carbon Karfe - Abun Carbon yana tsakanin 0.25 da 0.60%; Babban Carbon Karfe - Abun Carbon shine gabaɗaya 0.60%.
Standardaya mai zartarwa: Tarihi na Taiwan CNS Daidaitaccen Karfe Seces S20c, Din Jamusanci Standard Stanity Number Lambar Karfe Lambar Ck22 / C22. British BS Standard Baka IC22, Faransanci Standard Karfe Lambar Karfe Lambar C22-1, Belgium Nbn Standard Karfe Lambar Mumbin Karfe 1450, Spain UNT MID BIYU NA 1450, Spain UNeve Student Karfe No. F.112, American Aisi / Sae Standard Karfe No. 1020, Jafananci JIs Standard Karfe A'a A'a S20c / S22C.
Chemical composition: Carbon C: 0.32～0.40 Silicon Si: 0.17～0.37 Manganese Mn: 0.50～0.80 Sulfur S: ≤0.035 Phosphorus P: ≤0.035 Chromium Cr: ≤0.25 Nickel Ni: ≤0.25 Copper Cu: ≤0.25 Fourth, mechanical properties : Tenarfin ƙarfin tensil (Mpa): Girman tasiri 55 αkv (J / CM²): ≥69 (7) Hardness: Girma ≤197hb samfurin shine 25mth na fasaha na National Standard: GB699-1999
