摘要
针对大电炉投产不久出现的大量钢筋屈服点消失的问题进行了分析。结果表明,屈服点消失的钢筋的显微组织中均出现较多的异常混合组织,该组织的出现增加了钢筋第一类宏观内应力,从而影响了钢筋的力学性能,导致钢的屈服点消失。而钢中氮含量偏高引起轧后冷却速度加快是出现异常组织的直接原因。提出了措施,解决了问题。
It was found that high contents of nitrogen in thread reinforcing steel leads to the disappearance of the yielding point. Through a thorough metallographic study, large amounts of mixed Widmansttten and Bainite structures were observed. It was concluded that appearance of such mixed metallographic structures increases the first class macrointernal stress, which affects the mechanical properties of the reinforcing steel and leads to the disappearance of yielding points. On the ofher hand, the abnormal high contents of nitrogen cause a rapid cooling after rooling, which is the direct cause of the appearance of the abnormal metallographic structures. Measures were taken to overcome this problem.
出处
《理化检验（物理分册）》
CAS
2003年第10期509-511,540,共4页
Physical Testing and Chemical Analysis(Part A:Physical Testing)
关键词
力学性能
螺纹钢筋
氮
屈服点消失
混合组织
宏观内应力
冷却速度
Nitrogen content
Mechanical property
Disappearance of yielding point
Mixed metallographic structures
Macro-internal stress
