Typical methods for manufacturing seamless stainless steel pipe are extrusion, gun drilling, or piercing. However, the extrusion process provides a uniform OD (outer diameter) and concentric ID (inner diameter). Additionally, extrusion is a suitable process for long lengths of seamless stainless steel coiled tubing. The raw material starts as a hot extruded seamless tube. The material is then cold reduced. At this point, the raw material is processed in a long straight form through a tubular reducer known as a pilger mill.

Cold rolling is able to maintain a uniform outer diameter and concentric inner diameter because it is a longitudinal cold rolling process that reduces the diameter and wall thickness of the steel pipe in a single operation. For certain material types, this process can achieve over 90 percent cross-section reduction in a single working cycle.

Use lubricant on the OD and ID when shrinking the tube, then degrease in preparation for annealing. This process typically produces lengths of approximately 40 feet to 160 feet after reduction. Cold shrinking is an effective method for manufacturing long lengths of seamless pipe that will be processed into coiled form.

The above is the analysis of the manufacturing process of stainless steel seamless pipes. If you want to know more, please contact us.https://www.eastern-steels.com/