Claims
- 1. A filler wire or gas-shielded arc welding of high Cr steels containing 7.5 wt % or more Cr, characterized in that:
- the filler wire has a ratio of Cr equivalent/Ni equivalent of 1.8 to 2.8 and a product of Cr equivalent.times.Ni equivalent of 100 to 140, where Cr equivalent=Cr+Mo+1.5Si and Ni equivalent=Ni+0.5Mn+30C; and forms a weld metal having a ternary phase microstructure composed of austenite, ferrite and martensite phases during gas-shielded arc welding.
- 2. A filler wire for high Cr steels according to claim 1, characterized in that the filler wire consists essentially of:
- 0.005-0.12 wt % C,
- 0.01-1.0 wt % Si,
- 0.02-2.0 wt % Mn,
- 12.0-17.0 wt % Cr,
- 5.0-8.0 wt % Ni,
- 1.0-3.0 wt % Mo, and
- the balance of Fe and unavoidable impurities including 0.03 wt % or less P and 0.01 wt % or less S.
- 3. A filler wire for high Cr steels according to claim 2, which further contains 0.1 to 2.0 wt % Cu.
- 4. A filler wire for high Cr steels according to claim 1, which further contains at least one of 0.005 to 0.05 wt % Ti and 0.005 to 0.05 wt % Al.
- 5. A filler wire for high Cr steels according to claims 1, characterized in that the high Cr steels have a Cr content of 13 wt % or less.
- 6. A filler wire for high Cr steels according to claim 1, characterized in that the high Cr steels consist of:
- 0.035 wt % or less C,
- 0.50 wt % or less Si,
- 0.1 to 1.5 wt % Mn,
- 9 to 13 wt % Cr,
- 1.5 to 6.5 wt % Ni,
- 1.0 to 3.0 wt % Mo,
- 0.05 wt % or less Al,
- 0.02 wt % or less N, and
- the balance of Fe and unavoidable impurities including 0.03 wt % or less P and 0.005 wt % or less S,
- the high Cr steels being in the form of a weldable martensitic stainless steel pipe having a microstructure mainly composed of a tempered martensite.
- 7. A filler wire according to claim 6, characterized in that the weldable martensitic stainless steel pipe further contains 0.3 to 1.8 wt % Cu.
- 8. A filler wire for high Cr steels according to claim 1, characterized in that the high Cr steels contains 12 wt % or less Cr and has a microstructure composed either of a single martensite phase or 50% or more martensite phase and the balance of ferrite.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8-321210 |
Nov 1996 |
JPX |
|
Parent Case Info
This application is a 371 of PCT/JP97/04190 filed Nov. 18, 1997.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/JP97/04190 |
11/18/1997 |
|
|
5/17/1999 |
5/17/1999 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO98/22255 |
5/28/1998 |
|
|
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3769003 |
Kenyon |
Oct 1973 |
|
5944921 |
Cumino et al. |
Aug 1999 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
51-32449 |
Mar 1976 |
JPX |
7-185879 |
Jul 1995 |
JPX |