DAIKOWT 657M

GTAW
  • NICKEL ALLOYS
657M

Description

Solid rod for Ni-Cr-Fe alloys
Consumable used for the overlay cladding of ferrous materials used in high temperature applications, and the welding of nickel-chromium-iron alloy to itself, and to steels, and for welding IN657. This product is enriched with Boron and Zirconium to minimize the tendency for ductility-dip cracking and oxide inclusions. Welds made with this composition are particularly resistant to high temperature oxidation, carburization, and sulfidation, as well as to reducing and metal dusting environments.
Specifications
AWS A5.14
ERNiCr-7
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
Asme qualifications
F-No (QW432)
43
A-No (QW442)
-

Pren

40.15
Chem. Comp. %
DEFAULT
C
0.03
Mn
0.5
Ni
55
Cr
38.5
Nb
0.8
Al
1
P
0.002
S
0.002
Mo
0.5
Si
0.3
Cu
0.3
Fe
1
Ti
0.7
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
740
Yield strength Rp0.2 MPa
0
500
Elongation A (L0=5d0) %
0
40
Impact Charpy ISO-V
-
130J @ 20°C
Impact Charpy ISO-V
-
110J @ -50°C
Welding Parameters
1.6 mm
2.4 mm
Ampere
80A - 120A
130A - 160A
Voltage
10V - 13V
14V - 18V
Packaging
Ø 1,0÷4,0mm
Ø 1,0÷4,0mm
Packaging Type
5kg carton tube
5kg carton tube
657M
Description

Application

Filler metal classified under this classification is employed for overlay cladding on ferrous materials in high-temperature applications. Moreover, it proves effective in welding nickel-chromium-iron alloy to itself and to steels through the GTAW and GMAW processes. Welds created with this composition exhibit exceptional resistance to high-temperature oxidation, carburization, and sulfidation. Its functional versatility extends to operations in heat exchangers, piping, vessels, including evaporators, in offshore, marine, chemical, petrochemical, and power engineering industries. Notably, DAIKO 657M wire, is tailored for customization across a diverse range of components in oil-fired furnaces and boilers. These components encompass tube sheets, tube hangers, supports, and spacers in ships, power stations, and refineries within numerous petrochemical plants.

Alloy Type

The nominal composition (wt. %) of filler metal of this classification is 60 Ni, 37.5 Cr, 0.95 Al, and 0.6 Nb plus Ta.

Microstructure

Austenitic.

Materials

For cladding of ferrous materials used in high temperature applications, and the welding of nickel-chromium-iron alloy to itself, and to steels.
ASTM: B163, B166, B167, B168.
UNS: N06690, N08810.
PROPRIETARY: Incoloy® 671 (Special Metals), Incoloy® 800H (Special Metals).

Welding & PWHT

To ensure the cleanliness of the base metal in nickel-base alloy welding or heating, be vigilant about substances like oil, grease, paint, lubricants, marking pencils, temperature-indicating materials, threading compounds, and similar items. These materials often contain S or Pb, posing a risk of cracking (embrittlement) in both the base and weld metal during these processes. Generally, preheating nickel alloys is unnecessary unless required to bring the metal in the welding area to room temperature or a standard shop temperature to prevent moisture condensation. Adhere to a low heat input, capped at a maximum of 1.5 kJ/mm, and comply with an interpass temperature limit of 150°C. In most cases, solid solution nickel alloys don't require post-weld heat treatment for corrosion-resisting service, while precipitation-hardening alloys need heat treatment after welding for full strength.

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