Non-magnetic stainless steel wire as an armouring wire for power cables

Patent metadata

Field	Value
Publication number	US-9997278-B2
Application number	US-201214375752-A
Country	US
Kind code	B2
Filing date	Dec 12, 2012
Priority date	Feb 6, 2012
Publication date	Jun 12, 2018
Grant date	Jun 12, 2018

Abstract

A non-magnetic stainless steel wire with an adherent corrosion resistant coating is disclosed. The surface of the non-magnetic stainless steel is pre-treated so as to be sufficiently free from oxides and form a good adhesion with the above corrosion resistant coating. The non-magnetic stainless steel wire is used as a armoring wire for a power cable for transmitting electrical power.

First claim

The invention claimed is:

1. A power cable for transmitting electrical power, comprising:
an armouring layer comprising non-magnetic stainless steel wire and magnetic low-carbon steel wire,
said non-magnetic stainless steel wire comprising a corrosion resistant coating on the surface of the non-magnetic stainless steel, wherein said surface is pre-treated, the pre-treated surface being sufficiently free from oxides and adhering to said corrosion resistant coating, said corrosion resistant coating is zinc and/or zinc alloy, and said corrosion resistant coating is present in an amount of 20 g/m 2 to 600 g/m 2 , and
said magnetic low-carbon steel wire comprising a corrosion resistant coating.

2. A power cable for transmitting electrical power as in claim 1 , wherein said corrosion resistant coating on the surface of the non-magnetic stainless steel is a hot dipped zinc and/or zinc alloy coating.

3. A power cable for transmitting electrical power as in claim 1 , wherein an intermediate layer of electroplated nickel is present between the non-magnetic stainless steel wire and said corrosion resistant coating on the surface of the non-magnetic stainless steel.

4. A power cable for transmitting electrical power as in claim 1 , wherein said surface of the non-magnetic stainless steel wire is obtainable by a pre-treatment of electroplating with zinc and/or zinc alloy.

5. A power cable for transmitting electrical power as in claim 1 , wherein said surface of the non-magnetic stainless steel is obtainable by a pre-treatment of being held in inert and/or reduction atmosphere before the corrosion resistant coating is formed thereon.

6. A power cable for transmitting electrical power as in claim 1 , wherein said non-magnetic stainless steel wire has a round diameter ranging between 1.0 mm to 10.0 mm.

7. A power cable for transmitting electrical power according to claim 1 , wherein the power cable is a tri-phase submarine power cable.

8. A power cable for transmitting electrical power according to claim 1 , wherein said power cable is a high voltage cable of more than 110 kV.

9. A power cable for transmitting electrical power according to claim 1 , wherein said non-magnetic stainless steel wire is wound around at least part of said power cable.

10. A power cable for transmitting electrical power according to claim 1 , wherein said armouring layer is an annular armouring layer.

11. A power cable for transmitting electrical power according to claim 1 , wherein said non-magnetic stainless steel wire and said magnetic low-carbon steel wire are arranged parallel to each other in the armouring layer.

12. A power cable for transmitting electrical power according to claim 1 , wherein said non-magnetic stainless steel wire and said magnetic low-carbon steel wire alternate in the armouring layer.

13. A power cable for transmitting electrical power according to claim 1 , wherein said non-magnetic stainless steel wire and said magnetic low-carbon steel wire are interspersed in the armouring layer.

14. A power cable for transmitting electrical power according to claim 1 , wherein said magnetic low-carbon steel wire renders the location of the power cable detectable.

Assignees

• Bekaert Sa Nv

Inventors

• Verhoeven Flip
• Hejcman David
• Lagae Geert
• Gogola Peter

Classifications

• H01B7/14

  Submarine cables · CPC title

• C23C2/38

  Wires; Tubes · CPC title

• H01B7/22 Primary

  Metal wires or tapes, e.g. made of steel · CPC title

• H01B13/227

  Pretreatment · CPC title

• C23C2/02

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas (C23C2/30 takes precedence) · CPC title