30MnSi预应力PC钢棒延迟断裂成因分析及改进措施  

Analysis of Causes of Delayed Fracture in 30MnSi Pre stressed PC Steel Bars and Improvement Measures

作　　者：樊宝华 黄鹏 余博阳 Fan Baohua;Huang Peng;Yu Boyang(Shaanxi Iron and Steel Group Industrial Innovation Research Institute,Hanzhong Shaanxi 723000,China)

机构地区：[1]陕钢集团产业创新研究院,陕西汉中723000

出　　处：《山西冶金》2024年第7期52-54,共3页Shanxi Metallurgy

摘　　要：针对下游客户使用30MnSi盘条制作的预应力PC钢棒在存放、运输等过程中出现延迟断裂现象的问题,进行原因分析,以延迟断裂的PC钢棒及30MnSi盘条为研究对象,利用直读光谱仪、光学显微镜对预应力PC钢棒进行了化学成分、金相组织、断口宏观形貌和非金属夹杂物检测,借助扫描电镜对延时断裂断口进行微观形貌观察,并对钢材夹杂物进行能谱分析。经过深入研究,发现PC钢棒的延时断裂主要原因是钢材内部存在较大级别的C类夹杂物,次要原因为组织中存在马氏体。通过成因分析,针对性地优化冶炼、连铸及下游深加工的热处理工艺,有效解决了下游深加工产品PC钢棒延时断裂的问题。In response to the problem of delayed fracture of prestressed PC steel bars produced by downstream customers using 30MnSi wire rods during storage,transportation,and other processes,the causes were analyzed.The delayed fracture of PC steel bars and 30MnSi wire rods were studied,and the chemical composition,metallographic structure,macroscopic morphology of fracture surface,and non-metallic inclusions of prestressed PC steel bars were detected using a direct reading spectrometer and optical microscope.The microscopic morphology of the delayed fracture surface was observed using a scanning electron microscope,and the energy spectrum analysis of steel inclusions was conducted.After in-depth research,it was found that the main reason for the delayed fracture of PC steel bars is the presence of large levels of C-type inclusions inside the steel,and the secondary reason is the presence of martensite in the microstructure.By analyzing the causes and optimizing the heat treatment processes for smelting,continuous casting,and downstream deep processing,the problem of delayed fracture of PC steel bars in downstream deep processing products has been effectively solved.

关 键 词：PC钢棒 延迟断裂 内部夹杂、异常组织 热处理工艺 

分 类 号：TG142.33[一般工业技术—材料科学与工程]