Is é comhdhéanamh ceimiceach an t-innéacs is bunúsaí de millíní cruach agus gaineamh cruach, a chinnfidh microstructure millíní cruach agus gaineamh cruach agus éifeacht na cóireála teasa ina dhiaidh sin. Cinneann Carbón (C) cruas agus cáilíocht an lámhaigh cruach, agus ba cheart go mbeadh an t-ábhar measartha. Má tá an carbóin ard, níl an cruas go leor chun an éifeacht chuí a bhaint amach. Má tá an carbóin ard, tá an cruas ró-mhór, agus is furasta an lámhaigh cruach a bhriseadh. Is féidir le Sileacan (Si) feabhas mór a chur ar an teorainn leaisteacha, an pointe toraidh agus neart teanntachta cruach, is féidir le mangainéis (Mn) neart agus cruas millíní cruach a fheabhsú, feidhmíocht oibre teirmeach cruach a fheabhsú, agus is féidir le mangainéis an dochar sulfair a laghdú freisin. , feabhas a chur ar fhriotaíocht chaitheamh millíní cruach. Is eilimintí díobhálacha iad sulfair (S) agus fosfar (P), atá éasca le lámhaigh cruach a bhriseadh agus go dtiocfaidh réabfaidh roimh am, agus ba cheart go mbeadh siad chomh híseal agus is féidir (<0.05% is the best). Chemical composition is the most basic index of steel pellets and steel sand, which will determine the microstructure of steel pellets and steel sand and the effect of subsequent heat treatment. Carbon (C) determines the hardness and quality of the steel shot, and the content should be moderate. If the carbon is high, the hardness is not enough to achieve the due effect. If the carbon is high, the hardness is too large, and the steel shot is easy to be broken. Silicon (Si) can significantly improve the elastic limit, yield point and tensile strength of steel, manganese (Mn) can improve the strength and hardness of steel pellets, improve the thermal working performance of steel, and manganese can also reduce the harm of sulfur, improve the wear resistance of steel pellets. Sulfur (S) and phosphorus (P) are harmful elements, which are easy to brittle the steel shot and lead to premature rupture, and should be as low as possible (<0.05% is the best).
