DAIKOFCW 904LP

FCAW
  • SUPERAUSTENITIC STEELS
904L

Description

Rutile all position flux cored wire for 904L steel
Rutile flux-cored wire with fast-freezing slag for welding and cladding in all positions austenitic stainless alloys of the 20% Cr, 25% Ni, 5% Mo, 1.5% Cu, low C types. Its weld metal has good resistance to stress corrosion and intergranular corrosion and shows very good resistance to attack in non-oxidising acids. The resistance to crevice corrosion is better than that of ordinary 18% Cr, 8% Ni, Mo steels. The alloy is widely used in many applications related to the process industry.
Specifications
ISO 17633-A
T 20 25 5 Cu N L P M21 2
Shielding
M21
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+
Packaging Type
BS300 spool

Pren

38.81
Chem. Comp. %
DEFAULT
C
0.03
Mn
1.6
Ni
25.3
Cr
20.9
N
0.15
P
0.024
S
0.005
Mo
4.7
Si
0.65
Cu
1.5
Mechanical Properties
min
variant
Tensile strength Rm MPa
-
660
Yield strength Rp0.2 MPa
-
420
Elongation A (L0=5d0) %
-
35
Impact Charpy ISO-V
-
60J @ -196°C
Impact Charpy ISO-V
-
-
Welding Parameters
1.2 mm
1.6 mm
Ampere
130A - 280A
200A - 350A
Voltage
22V - 30V
28V - 32V
Packaging
Ø 1,2÷1,6mm
Ø 1,2÷1,6mm
Packaging Type
BS300 spool
BS300 spool
Description

Application

Known for delivering a fully austenitic, low-carbon weld metal enriched with Mo and Cu, these consumables exhibit exceptional resistance to corrosion in sulphuric, phosphoric, and various inorganic and organic acids. Not the typical choice for environments demanding resistance to concentrated nitric acid, they excel in scenarios involving severe chloride pitting media, where opting for overmatching nickel base weld metal, such as alloy 625, is recommended. Noteworthy as the preferred weld metal for certain lower alloy austenitics like Creusot UHB 34L and UHB 734L, especially in wet process phosphoric acid service, these consumables find versatile applications. Their usage spans tanks, process vessels, piping systems, agitators, rotors, and cast pumps and valves, catering to the needs of fertilizer, phosphoric, sulphuric, and acetic acid plants. Additionally, they prove invaluable in salt and seawater environments and are enlisted in select offshore applications, including overlays on mild and low alloy steels. The welding process mandates no preheat or post-weld heat treatment (PWHT), with interpass temperatures carefully regulated to a maximum of 150°C. It's crucial to exercise control over heat input, especially when utilizing larger diameter shielded metal arc welding (SMAW) electrodes.

Alloy Type

904L is a nominally 20%Cr-25%Ni-5%Mo-2%Cu alloy with good corrosion resistance.

Microstructure

In the as-welded condition the weld metal microstructure is fully austenitic.

Materials

Suitable for copper-free variants of the listed alloys and also to overmatch leaner alloys such as 317L, 317LN, 317LM, 317LMN, 1.4439, 1.4440 and S31726.
EN W.Nr.: 1.4505 (X4NiCrMoCuNb20-18-2), 1.4506 (X5NiCrMoCuTi 20-18), 1.4536 (GX2NiCrMoCuN25-20), 1.4539 (X1CrNiMoCuN25-20-5), 1.4585 (G-X7CrNiMoCuNb1818), 1.4500 (G-X7NiCrMoCuNb2520).
ASTM: N08904.
PROPRIETARY: Uddelholm 904L (voestalpine), 2RK65 (Sandvik), Cronifer 1925LC (VDM), 254SLX (Outokumpu), Uranus® B6, B6M (Industeel).

DO YOU NEED HELP?

Go to our dedicated section or 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