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用光镜、扫描电镜对凹螺纹钢筋热处理纵向裂纹进行了分析，研究发现钢筋热处理纵裂主要是由于钢筋中的带状组织、带状夹杂物和内裂纹缺陷引起的。要消除纵向裂纹，应尽可能地减少原材料中的夹杂物和组织缺陷。
Longitudinal cracks of concave rebar heat treatment were analyzed by light microscope and scanning electron microscope. It was found that longitudinal cracking of rebar was mainly caused by ribbon structure, ribbon inclusions and internal crack defects in rebar. To eliminate longitudinal cracks, should be as much as possible to reduce the inclusions in raw materials and tissue defects.