DAIKOWT 657M

GTAW
  • NICKEL ALLOYS
657M

Description

Rod for Ni-Cr-Fe alloys
Rod designed for plating of ferrous materials in high-temperature applications and for similar welds of nickel-chromium-iron alloys or with steel. Enriched with boron and zirconium to minimize solidification cracking and oxide inclusions. Ensures welds resistant to oxidation, carburization, sulfidation, and reducing environments with metal powders, also ideal for processing on IN657 and in aggressive chemical 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

The filler metal belonging to this classification is specifically designed for cladding ferrous materials intended for high-temperature applications and for homogeneous welding of nickel-chromium-iron alloys with steel, using GTAW and GMAW processes. The resulting welds offer excellent resistance to high-temperature oxidation, as well as carburization and sulfidation. This product is particularly suitable for use in heat exchangers, piping, vessels, and evaporators in sectors such as offshore, marine, chemical, petrochemical, and power engineering. The DAIKO 657M wire is applied in a wide range of components for oil furnaces and boilers, such as tube sheets, pipe supports, and spacers used in ships, power plants, refineries, and 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

Before proceeding with the welding or heating of any nickel-based alloy, it is essential to thoroughly clean the base metal. Components such as oil, grease, paint, lubricants, marking pencil graphite, temperature indicators, and threading compounds often contain sulfur or lead, which, if present during welding or heating processes, can cause cracking or embrittlement of the base or filler metal. Nickel alloys do not require preheating, except to bring the metal in the welding zone to room temperature or typical shop temperature to prevent moisture condensation. It is essential to maintain low heat input, maximum 1.5 kJ/mm, along with an interpass temperature not exceeding 150 °C. In most cases, solid solution nickel alloys do not require post-weld heat treatment for corrosion-resistant service. However, precipitation-hardened alloys do require heat treatment after welding to develop their maximum strength.

DO YOU NEED HELP?

Go to our dedicated section or contact us
Contact us
DAIKO supporting the environment
Questo sito si avvale di cookie necessari al suo funzionamento ed utili alle finalità illustrate nella cookie policy.

Carrello

Il carrello è vuoto