(1). extrusion seamless circular pipe   Outer diameter scope: 25mm ~ 550mm   Wall thickness scope: 5mm ~ 50mm  (2). cold-drawings, roll over the circular pipe   Outer diameter scope: 6mm ~ 120mm   Wall thickness scope: 0.5mm ~ 5.0mm  (3). cold-drawings squares, rectangular tube   Length of side scope: 10mm ~ 70mm   Wall thickness scope: 1.0mm ~ 5.0mm  (4). cold-drawings ellipses tube   Major axis scope: 27mm ~ 114.5mm   Minor axis scope: 11.5mm ~ 48.5mm   Wall thickness: 1.0mm ~ 2.5mm
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