热浸渗铝X70管线钢扩渗工艺研究  

Research on Hot Diffusion Aluminizing Process of X70 Pipe Line Steel

作　　者：黄敦伟 胡爱萍[1] 张宏伟 孔德军[1] 

机构地区：[1]常州大学机械工程学院,常州213016 [2]常州阳光渗铝钢有限公司,常州213104

出　　处：《表面技术》2013年第4期72-75,109,共5页Surface Technology

摘　　要：采用二次正交回归试验方法,研究了X70管线钢热扩渗铝保温温度、扩渗时间与渗铝层厚度的关系,建立了渗层回归方程,得到X70管线钢最优的热扩渗铝工艺参数。观察了X70管线钢热浸渗铝处理后的表面、界面微观形貌,分析了Fe和Al的含量沿渗层的变化情况,并对热浸渗铝过程中的元素扩散机理进行了探讨。结果表明:渗铝层厚度随保温温度的升高和扩渗时间的延长而增大,适宜的保温温度为950℃,扩渗时间为6 h。The relationship between hot diffusion aluminizing temperature,infiltration time and thickness of aluminized coating of X70 pipe line steel was researched by quadratic orthogonal regression testing method.The regression equation of the alloying layer thickness was established.The optimum process for hot diffusion aluminizing treatment was gotten.The surface and interface morphologies of X70 pipeline steel after the aluminizing treatment were observed,and Fe and Al content change by the carbonitride layer were analyzed.The element diffusion mechanism of hot dipping alumetizing process was discussed.The results show that alloying layer thickness is increased with the rising of insulation temperture and the extending of diffusion time.The ideal inoulation temperature is 950 ℃ and time is insulation 6 h.

关 键 词：X70管线钢 热扩渗铝 二次正交回归 工艺参数 

分 类 号：TG174.445[金属学及工艺—金属表面处理]