半圓鋼是指(zhi)截面為(wei)(wei)圓(yuan)形(xing)的實心長條鋼材。其規百格以(yi)(yi)直(zhi)徑的毫米(mi)(mi)(mi)(mi)(mi)數表示，如“50”即表示直(zhi)徑為(wei)(wei)50毫米(mi)(mi)(mi)(mi)(mi)的半(ban)圓(yuan)鋼度(du)。半(ban)圓(yuan)鋼分為(wei)(wei)熱軋，鍛(duan)制和冷(leng)拉(la)三(san)種(zhong)(zhong)。熱軋半(ban)圓(yuan)鋼的規格為(wei)(wei)毫米(mi)(mi)(mi)(mi)(mi)。其中(zhong)：毫米(mi)(mi)(mi)(mi)(mi)的小半(ban)圓(yuan)鋼大多(duo)以(yi)(yi)直(zhi)條成捆(kun)回供應，常用(yong)(yong)作(zuo)鋼筋，螺栓(shuan)及各種(zhong)(zhong)機(ji)械(xie)零件，大于(yu)(yu)25毫米(mi)(mi)(mi)(mi)(mi)的半(ban)圓(yuan)鋼，主(zhu)要(yao)用(yong)(yong)于(yu)(yu)制造機(ji)械(xie)零件或作(zuo)無縫(feng)鋼答管坯。制罐等。此外(wai)，低碳(tan)鋼也廣泛(fan)地(di)作(zuo)為(wei)(wei)滲碳(tan)鋼，用(yong)(yong)于(yu)(yu)機(ji)械(xie)制造業。為(wei)(wei)中(zhong)碳(tan)鋼，多(duo)在調質(zhi)狀(zhuang)態下使用(yong)(yong)，制作(zuo)機(ji)械(xie)制造工業的零件。