Metal pipe and method for mfg. same

Metal pipe and method for mfg. same

  • CN 1,419,976 A
  • Filed: 10/31/2002
  • Published: 05/28/2003
  • Est. Priority Date: 10/31/2001
  • Status: Active Application
First Claim
Patent Images

1. metal tube, its inner surface has the maximum height difference (Rf) that is no more than 3 microns on surface roughness, and has and be no more than 1.0 millimeters internal diameter.

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