冷轧纵肋钢筋的机械性能试验研究

Experiment research for the mechanical behaviors of cold-rolling steel rod with tandem lib

简要介绍了一种新型建筑用钢筋冷轧纵肋钢筋的加工工艺 ,通过对该新型钢筋与加工前的母材作金相对比分析 ,发现该新型钢筋的表面边缘组织晶体形态冷作变化明显的金相显微特征。又经拉伸试验验证 ,表明该新型钢筋具有与一般冷加工钢筋所不同的σ-ε曲线 ,虽然抗拉强度超过 50 0 MPa,但其最大力下总伸率 Agt仍可达到 2 %以上 ,说明该新型钢筋具有较大塑性变形能力 ,是一种较理想的强度与塑性优化品种。并对一定数量样本试验结果进行数理统计分析 ,得出了该新型钢筋品种的极限抗拉强度 Rm、拉断伸长率 A、最大力下总伸长率 Agt等一系列机械性能特征值 ,可供相关标准编制和工程应用参考。

The cold\|rolling steel rod with tandem lib, a new architecture\|structure steel bar, is studied. The microstructure and tensile properties of the rod are analyzed with optical microscope and tensile machine. The microstructure observation shows that there is cold hardening in the outside layer of rod. The tensile test shows that the \$σ\|ε\$ curve is different from that of common cold\|working steel rod. The total elongation percentage at maximum force (Agt) is obtained which is larger than 2% when the tensile strength Rm is larger than 500MPa. It is desirable for cold\|rolling steel rod. The analytical results provide reference for criteria compling and engineering applications.