Small Diameter Φ8-18mm Precision Tube Mill Machine ZY16 HF Welded Steel Pipe

Problem Small diameter tube makers often struggle to hold roundness and weld straightness when running Φ8-18mm pipe. A tiny cross-section amplifies any roller misalignment into visible ovality and a wandering weld seam, so the finished tube fails dimensional checks even though the mill itself is running normally. Cause The root cause is cumulative forming error. With only 8-18mm outside diameter, a 0.05mm roller offset is a far larger relative deviation than on a 50mm pipe.