Birta waxaa loo qaybin karaa birta kaarboonka yar, birta kaarboonka dhexdhexaadka ah iyo birta kaarboonka sare. Birta kaarboonka ee hooseeya - Waxyaabaha kaarboonku guud ahaan waa ka yar yahay 0.25%; Birta kaarboon dhexdhexaadka ah - Waxyaabaha kaarboonku guud ahaan waa inta u dhaxaysa 0.25 iyo 0.60%; Birta kaarboonka sare - Waxyaabaha kaarboonku guud ahaan waa ka weyn yahay 0.60%.
Heerka fulinta: dalkayga Taiwan CNS nambarka birta caadiga ah S20C, Jarmal DIN walxaha caadiga ah 1.0402, Jarmal DIN lambarka birta caadiga ah CK22/C22. British BS heerka birta nambarka IC22, Faransiiska AFNOR nambarka birta caadiga ah CC20, Faransiiska NF heerka birta C22, Talyaani UNI lambarka birta caadiga ah C20/C21, Belgium NBN lambarka birta caadiga ah C25-1, Sweden SS lambarka birta caadiga ah 1450, Spain UNE birta caadiga ah No. F.112, American AISI/SAE birta caadiga ah No. 1020, Japanese JIS birta caadiga ah No. S20C/S22C.
Kaarboon C: 0.32～0.40 Silicon Si: 0.17～0.37 Manganese Mn: 0.50 , sifooyinka farsamada : Xoog xajin σb (MPa): ≥530 (54) Tamarta wax-soosaarka σs (MPa): ≥315 (32) Kordhinta δ5 (%): ≥20 Meesha hoos u dhaca 55 qiimaha adkaanta saamaynta αkv (J/cm²): ≥69 (7) Adag: kulayl la'aan
