Isitimela sensimbi siyingxenye eyinhloko yomzila wesitimela.Ingxenye kajantshi ngokuvamile inomumo ongu-I, yakhiwa ojantshi ababili abahambisanayo, futhi kunezigaba ezingaphezu kuka-35 zikaloliwe.Izinto eziyinhloko zihlanganisa i-carbon C, i-manganese Mn, i-silicon Si, i-sulphur S, i-phosphorus P. Ubude obujwayelekile besitimela sensimbi yaseChina buyi-12.5m no-25m, futhi imininingwane yesitimela yensimbi ingu-75kg/m, 90kg/m, 120kg/m .