A.0.1% B.0.5% C.1% D.2%
A.HRB B.HRBF C.HFB D.HPB
A.HRB400為其牌號 B.HRB400為其等級 C.屈服強度特征值為400Mpa D.交貨檢驗屈服強度的最小值為400MPa