氮含量对螺纹钢夹杂物、组织及性能的影响  

Study on the effect of N content on inclusions,microstructures and mechanical properties of rebar steel

作　　者：戴雨翔 DAI Yuxiang(Metallurgical Department of Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081

出　　处：《江西冶金》2021年第6期39-49,共11页Jiangxi Metallurgy

摘　　要：运用扫描电子显微镜、高温共聚焦显微镜等检测手段,研究了不同氮含量的螺纹钢样品中的夹杂物、钢组织及性能,并通过理论计算提出螺纹钢氮控制的方法。研究结果表明,一定含量的氮会在钢中以复合状夹杂物的形式出现,夹杂物尺寸为5~10μm,主要成分为Fe、N、C、O,其中氮含量可以高达30%~40%,含氮夹杂物会引发部分应力集中并使得裂纹扩展。氮含量过高,碳氮化合物固溶的区域会形成过饱和的固溶先析铁素体,与周围的珠光体共同形成魏氏组织,对钢的质量造成不良影响。在实际生产中,应尽量避免钢液与氮接触,减少钢液增氮,控制氮含量在0.01%以内。The inclusions,microstructures and mechanical properties of three trials of rebar steel samples with different N content were studied by scanning electron microscope and high temperature confocal microscope.It is found that when the content of N is more than 0.02%,complex inclusions of N(30%~40%)are formed in the steel which can cause partial stress concentration and crack growth.When the content of N is more than 0.02%,supersaturated ferrite will be formed in the region of carbon and nitrogen solution.The Weiss structure will be formed together with the surrounding pearlite,which will have bad effect on the quality of steel.In production,it is necessary to avoid the contact of molten steel with nitrogen.Nitrogen content in steel should be controlled less than 0.01%.

关 键 词：螺纹钢 钢组织 钢性能 氮含量控制 LF精炼 

分 类 号：TF761[冶金工程—钢铁冶金]