G-TECH 25.24Nb

SMAW
  • HIGH TEMPERATURE ALLOYS
4830

Description

Basic coated electrode
This basic coated high recovery electrode deposits a weld metal with a fully austenitic structure with carbide precipitations and scaling resistant up to 1000°C. Product for welding and cladding of heat resistant fully austenitic steels and similar alloyed steel casts for high temperature applications. Its basic coating ensures excellent positional welding characteristics with good gap bridging ability. Ease of slag removal reduces post-welding cleaning operations to a minimum.
Specifications
ISO 3581-A
E Z 25 24 Nb 32
Shielding
-
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+;
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
5
A-No (QW442)
-

Pren

25
Chem. Comp. %
DEFAULT
C
0.25
Mn
0.8
Ni
24
Cr
25
Nb
1.2
P
0.008
S
0.008
Si
0.3
Mechanical Properties
min
variant
Tensile strength Rm MPa
510
590
Yield strength Rp0.2 MPa
350
440
Elongation A (L0=5d0) %
10
12
Impact Charpy ISO-V
-
-
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
Ampere
60A - 90A
80A - 110A
100A - 150A
Voltage
-
-
-
Packaging
55 pcs/kg
30 pcs/kg
19 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Description

Application

This specialized product is meticulously developed for the purpose of welding and cladding heat-resistant, fully austenitic steels, along with similar alloyed steel casts. It stands out by providing a weld deposit that not only maintains its scale resistance but also exhibits remarkable durability up to temperatures as high as 1000°C. Noteworthy features include robust resistance to thermal shock and fatigue. Originating from the family of 800 type alloys, this product distinguishes itself through elevated chromium and nickel contents. This unique composition translates to improved carburization and oxidation resistance, making it a preferred choice for demanding applications. Applications range from welding centrifugally cast pyrolysis coils to reformer tubes, return bends, and tees. The alloy's exceptional performance in resisting harsh environmental conditions positions it as a reliable solution for critical components in high-temperature environments, ensuring longevity and efficiency in demanding industrial settings.

Alloy Type

25% Cr – 24% Ni – austenitic alloy.

Microstructure

Fully austenitic structure with carbide precipitations.

Materials

Joining and cladding of fully austenitic heat resistant CrNi-steels of the same kind and similar Cast steels.
EN W.Nr.: 1.4855 (GX40CrNiSiNb24-24), 1.4845 (X8CrNi 25-21), 1.4830 (X35CrNiNb25-24).
ASTM: 310S.

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