Stainless steel flux cored wire

Patent metadata

Field	Value
Publication number	US-9751158-B2
Application number	US-98348611-A
Country	US
Kind code	B2
Filing date	Jan 3, 2011
Priority date	Jan 27, 2010
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

In a stainless steel flux cored wire comprising a stainless steel shell and a flux filling the shell, the amount of Si contained in the entire wire is 2.5% by mass or higher, preferably 3.0% by mass or higher in terms of SiO 2 , and the amount of at least one compound selected from the group consisting of polytetrafluoroethylene, graphite fluoride and perfluoropolyether contained in the flux is 0.005 to 0.10% by mass of the total mass of the wire in terms of F, preferably 0.020% by mass or higher. By employing such a constitution, in welding of Cr—Ni-based and Cr-based stainless steels and other materials, fume generation and hexavalent chromium leaching can be significantly reduced, and excellent welding workability can be provided.

First claim

What is claimed is:

1. A stainless steel flux cored wire comprising a stainless steel shell and a flux filling the shell,
an amount of Si contained in the entire wire being 2.5% by mass or higher in terms of SiO 2 , and
a total amount of at least one compound selected from the group consisting of polytetrafluoroethylene, graphite fluoride and perfluoropolyether contained in the flux being 0.005 to 0.10% by mass of the total mass of the wire in terms of F.

2. The stainless steel flux cored wire according to claim 1 , wherein
the amount of at least one compound selected from the group consisting of polytetrafluoroethylene, graphite fluoride and perfluoropolyether contained is 0.020% by mass or higher of the total mass of the wire in terms of F.

3. The stainless steel flux cored wire according to claim 1 , wherein
a total amount of Na, K and Li in the flux is controlled to be 0.40% by mass or lower of the total mass of the wire.

4. The stainless steel flux cored wire according to claim 1 , wherein
the amount of Cr contained in the entire wire is 17.0 to 21.0% by mass, and the amount of Ni contained is 8.0 to 11.0% by mass.

5. The stainless steel flux cored wire according to claim 1 , wherein
the amount of Si contained is 3.0% by mass or higher in terms of SiO 2 .

6. The stainless steel flux cored wire according to claim 1 , wherein
the flux contains Ti oxide in an amount of 0.80% by mass or higher in terms of TiO 2 .

7. The stainless steel flux cored wire according to claim 1 , wherein
the wire contains Zr oxide and Al oxide in a total amount of 0.05 to 3.20% by mass in terms of ZrO 2 and Al 2 O 3 .

8. The stainless steel flux cored wire according to claim 1 , wherein
the wire contains alkali metal fluoride in a total amount of 0.02 to 0.30% by mass in terms of F.

9. The stainless steel flux cored wire according to claim 1 , wherein the flux contains polytetrafluoroethylene.

10. The stainless steel flux cored wire according to claim 1 , wherein the flux contains graphite fluoride.

11. The stainless steel flux cored wire according to claim 1 , wherein the flux contains perfluoropolyether.

12. The stainless steel flux cored wire according to claim 1 , wherein the total amount of Na, K and Li is 0.06 to 0.50 by mass.

Assignees

• Ikeda Tetsunao
• Sugahara Hiroshi
• Watanabe Hirohisa
• Kobe Steel Ltd

Inventors

• Ikeda Tetsunao
• Sugahara Hiroshi
• Watanabe Hirohisa

Classifications

• B23K35/304

  with Cr as the next major constituent · CPC title

• B23K35/3607

  Silica or silicates · CPC title

• B23K35/0266

  flux-cored · CPC title

• B23K35/22

  characterised by the composition or nature of the material · CPC title

• B23K35/3033

  Ni as the principal constituent · CPC title