元素指標(%):[C]≥3.3%、[Si]0.4-0.7%、[Ti]≤0.03%、[Mn]≤0.05%、[P]≤0.02%、[S]≤0.02%;
1級品11種微量元素總量≤0.046%,2級品11種微量元素總量≤0.06%