Iron-chromium based brazing filler metal

Patent metadata

Field	Value
Publication number	US-10384313-B2
Application number	US-201013395587-A
Country	US
Kind code	B2
Filing date	Sep 17, 2010
Priority date	Sep 18, 2009
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

A brazing filler metal with excellent wetting behavior on stainless steel base material is provided. The brazing filler metal produces a brazed joint with high strength and good corrosion resistance. The brazing filler metal is suitable for brazing stainless steel and other materials where corrosion resistance and high strength is required. Typical examples of applications are heat exchangers and catalytic converters.
The iron-chromium based brazing filler metal powder comprises:
11-35 wt % chromium, 0-30 wt % nickel, 2-20 wt % copper, 2-10 wt % silicon, 4-10 wt % phosphorous, 0-10 wt % manganese, and at least 20 wt % iron, and if Si is equal to or less than 6 wt % then P should be above 8 wt %, and if P is less or equal to 8 wt % then Si should be above 6 wt %.

First claim

The invention claimed is:

1. An iron-chromium based brazing filler metal powder suitable for brazing of stainless steel base material comprising:
11-35 wt % chromium,
0-30 wt % nickel,
5-20 wt % copper,
2-10 wt % silicon,
4-10 wt % phosphorous,
0-10 wt % manganese, and
trace elements in amounts less than 1 wt %
balanced with at least 20 wt % iron, and
if silicon is equal to or less than 6 wt % then phosphorous should be above 8 wt %, and
if phosphorous is less or equal to 8 wt % then silicon should be above 6 wt %,

wherein the iron based brazing filler metal powder has a mean particle size of 10-100 μm.

2. The brazing filler metal powder according to claim 1 , wherein the silicon content is above 6 wt % and below or equal to 10 wt %.

3. The brazing filler metal powder according to claim 1 , wherein the phosphorous content is above 6 wt % and below or equal to 10 wt %.

4. The brazing filler metal powder according to claim 1 , wherein the total amount of silicon and phosphorous is below or equal to 20 wt %.

5. The brazing filler metal powder according to claim 1 , wherein the nickel content is between 10 and 20 wt %.

6. The brazing filler metal powder according to claim 1 , wherein the copper content is between 5 and 15 wt %.

7. The brazing filler metal powder according to claim 1 , wherein the manganese content is below 7 wt %.

8. The brazing filler metal powder according to claim 1 , wherein the chromium content is between 20 and 30 wt %.

9. The brazing filler metal powder according to claim 1 , wherein the chromium content is between 11 and 20 wt %.

10. The brazing filler metal powder according to claim 1 , wherein the iron based brazing filler metal is converted to paste, tape, or foil by conventional methods.

11. The brazing filler metal powder according to claim 1 , wherein the phosphorous content is above 8 wt % and below or equal to 10 wt %.

12. The brazing filler metal powder according to claim 1 , wherein the nickel content is 0 and 20 wt %, wherein the phosphorous content is above 8 wt % and below or equal to 10 wt %.

13. An iron-chromium based brazing filler metal powder suitable for brazing of stainless steel base material comprising:
11-35 wt % chromium,
0-20 wt % nickel,
5-20 wt % copper,
2-10 wt % silicon,
4-10 wt % phosphorous,
0-10 wt % manganese, and
trace elements in amounts less than 1 wt %
balanced with at least 20 wt % iron, and
if silicon is equal to or less than 6 wt % then phosphorous should be above 8 wt %, and
if phosphorous is less or equal to 8 wt % then silicon should be above 6 wt %.

14. An iron-chromium based brazing filler metal powder suitable for brazing of stainless steel base material comprising:
11-35 wt % chromium,
0-30 wt % nickel,
5-20 wt % copper,
2-10 wt % silicon,
8-10 wt % phosphorous,
0-10 wt % manganese, and
trace elements in amounts less than 1 wt %
balanced with at least 20 wt % iron.

15. An iron-chromium based brazing filler metal powder suitable for brazing of stainless steel base material comprising:
11-35 wt % chromium,
0-30 wt % nickel,
5-20 wt % copper,
2-10 wt % silicon,
4-10 wt % phosphorous,
0-10 wt % manganese, and
trace elements in amounts less than 1 wt %
balanced with at least 20 wt % iron, and
if silicon is equal to or less than 6 wt % then phosphorous should be above 8 wt %, and
if phosphorous is less or equal to 8 wt % then silicon should be above 6 wt %,

wherein the iron based brazing filler metal is converted to paste, tape, or foil by conventional methods.

Assignees

• Persson Ulrika
• Hoeganaes Ab Publ

Inventors

• Persson Ulrika

Classifications

• C22C38/38

  with more than 1.5% by weight of manganese · CPC title

• C22C38/20

  with copper · CPC title

• C22C33/0285

  with Cr, Co, or Ni having a minimum content higher than 5% · CPC title

• B23K35/3086 Primary

  containing Ni or Mn · CPC title

• B23K35/025

  Pastes, creams or slurries · CPC title