结构用管 meaning in Chinese

mechanical tube
structural tube

Mechanical tube , automobile semi - axle sleeve tube
结构用管汽车半轴套管
In addition , the author describes how to set up the basic process parameters of heat treatment with protective atmosphere , and gives us case analysis concerning protective atmosphere heat treatment of automobile tube , precision structural tube and power station boiler tube
介绍了保护气氛热处理主要工艺参数的确定及汽车用管、精密结构用管、电站锅炉用管的保护气氛热处理实例分析。