Abstract: Described here in the essay are the main aspects of a certain domestic heat treatment production line for the Φ180 mm seamless steel pipe,including the heat treatment process flow,the layout,functions of the major equipment units and their technical parameters,and a summary of what learnt from the equipment type determination,etc. When determining the equipment type,all the three aspects have to be considered,i.e.,the technology,the economy,and the suitability;the production capacity of each individual critical equipment unit has to be comprehensively accounted,and the equipment configuration is made as per the production line capacity requirement;and finally emphasis has to be laid to such factors as energy-saving,environment protection and the maintainability of the equipment.