DAIKOWT X

GTAW
  • NICKEL ALLOYS
ALLOY X

Description

Solid rod for Hastelloy® X
The deposited weld metal, matching Alloy X, has an exceptional combination of oxidation resistance, fabricability and high-temperature strength and is very resistant to stress-corrosion cracking in petrochemical applications. X alloy exhibits good ductility after prolonged exposure at high temperatures up to 870°C. The filler metal is also a good candidate for dissimilar welding between solid solution nickel based alloys and Ni-Fe-Cr alloys. The sector of greatest application is the aeronautical one where it is used on exhaust pipes, blades and turbine afterburners.
Specifications
AWS A5.14
ERNiCrMo-2
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

50.175
Chem. Comp. %
DEFAULT
C
0.05
Mn
0.5
Ni
48
Cr
21.3
P
0.01
S
0.001
Mo
8.5
Si
1
Cu
0.5
Fe
18.5
W
0.5
Co
1
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
ALLOY X
Description

Application

Consumables tailored for welding Hastelloy X base metal and executing dissimilar welding between this alloy and nickel base alloys, stainless steel, carbon steel, and low alloy steels are adept at cladding steel with nickel-chromium-molybdenum weld metal through both Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW). These consumables exhibit remarkable strength and oxidation resistance, particularly notable in environments with temperatures reaching up to 1200°C. The filler metal in question presents an outstanding amalgamation of oxidation, corrosion, and thermal shock resistance. Weld deposits formed with this consumable showcase elevated temperature strength and effectively resist weld metal fatigue at temperatures up to 1200°C. Widely employed in the aerospace sector, this consumable plays a pivotal role in fabricating engine tailpipes, turbine blades, nozzle vanes, and afterburner components. Additionally, its utility extends to petrochemical applications where it serves to counteract stress corrosion cracking.

Alloy Type

The nominal composition (wt. %) of filler metal of this classification is 47 Ni, 22 Cr, 18 Fe, 9 Mo, and 1.5 Co.

Microstructure

Austenitic.

Materials

Ni-Cr-Mo high temperature strength nickel alloy used for welding similar base metals such as Hastelloy X and Inconel Alloy HX to itself or to Stainless Steels, Carbon Steels or low-alloy Steels.
ASTM: B 366, B 435, B 572.
UNS: N06002.
PROPRIETARY: Hastelloy® X Alloy (Haynes International Inc).

Welding & PWHT

Prior to welding or heating nickel-base alloys, ensuring base metal cleanliness is crucial. Common contaminants like oil, grease, paint, lubricants, and marking pencils can contain sulfur or lead, posing a risk of embrittlement in both the base metal and weld metal. Typically, preheating nickel alloys is unnecessary, except to bring the metal in the welding area to room temperature. Adhering to a low heat input, capped at 1.5 kJ/mm, and observing an interpass temperature limit of 150°C is critical. In most cases, solid solution nickel alloys do not require post-weld heat treatment for corrosion resistance.

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