DAIKOWT 602

GTAW
  • NICKEL ALLOYS
602

Description

Nickel-based rod for high-temperature alloys
Rod designed for joining materials of similar composition, with excellent creep resistance and oxidation resistance up to about 1200 °C. Ideal for welding nickel-chromium-iron alloys to steel and other nickel-based alloys, it is typically used in radiant tubes, hydrogen production, reformers for the chemical and petrochemical industry, and furnace components. It is recommended not to oscillate the bead and not to exceed 120 °C as the interpass temperature.
Specifications
EN ISO 18274
S Ni 6025
AWS A5.14
ERNiCrFe-12
Werkstoff Number
2.4649
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

25
Chem. Comp. %
DEFAULT
C
0.17
Mn
0.07
Ni
62
Cr
25
Al
2.3
P
0.005
S
0.002
Si
0.05
Cu
0.01
Fe
9.8
Ti
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
660*
720
Yield strength Rp0.2 MPa
0
500
Elongation A (L0=5d0) %
0
25
Impact Charpy ISO-V
-
50J @ 20°C
Impact Charpy ISO-V
-
-
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
602
Description

Application

Mainly used for joining similar materials, offering excellent creep and oxidation resistance up to around 1200 °C, thanks to the addition of aluminum. It demonstrates exceptional fatigue resistance in both HCF (high cycle fatigue) and LCF (low cycle fatigue) modes. It also possesses excellent high-temperature corrosion resistance in environments undergoing carburization and oxidation/oxychlorination, as well as in 'metal dusting' conditions. Typical applications include radiant tubes, furnace muffles, rotary and vertical furnaces, rolls and other furnace components, methanol and ammonia synthesis, hydrogen production, reformers in the chemical and petrochemical industries, as well as in exhaust systems for automobiles.

Alloy Type

The nominal composition (wt. %) of filler metal of this classification is 63 Ni, 25 Cr, 9.5 Fe, and 2.1 Al.

Microstructure

High-carbon Ni-Cr-Fe alloy with a face-centered cubic microstructure.

Materials

Nickel-chromium-iron-aluminum alloy type UNS N6025 to itself and Nickel chromium-iron to steel and to other nickel base alloys.
  • EN W.Nr.: 2.4633 (NiCr25FeAlY)
  • UNS: N06025
  • PROPRIETARY: Nicrofer 6025 HT (VDM)

Welding & PWHT

Before welding or heating any nickel-based alloy, it is essential that the base metal is thoroughly cleaned. Oil, grease, paints, lubricants, marking pencils, temperature-indicating materials, thread compounds, and similar often contain sulfur or lead, which can cause cracking (embrittlement) in the base or filler metal if present during welding or heating. It is recommended to clean the weld area (on both sides) and the filler material (welding rods) with acetone. The application of a non-weaving technique is preferable to ensure low heat input (max < 1 kJ/mm) and the interpass temperature should be maintained below 120 °C. Normally, pre- or post-weld heat treatments are not required. However, to reduce the risk of stress relaxation cracking in materials exposed to operating temperatures between 600 and 725 °C, following cold work and/or repair welding, an annealing treatment can be considered.

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