Through designing for finishing pass and ana lysing for rolling shaped of round bar,puts forward reasonable determining metho d for out of roundness of round bar produced by national standard and the devel oping trend of round bar finishing pass design.

• 通过对圆钢成品孔型成熟设计和轧制成型的分析,提出了国标圆钢不圆度较合理的测定方法以及圆钢成品孔型设计的发展趋势。