DAIKOWS 309LMo

SAW
  • AUSTENITIC STAINLESS STEELS
309LMo

Description

23%Cr – 13%Ni – 2,5%Mo solid wire
Mainly used under high dilution conditions, particularly for welding dissimilar joints between duplex and stainless steels with low-alloyed steels. Very good wetting characteristics and high resistance against cracking. Suitable for overlay welding of unalloyed and low alloyed steels and for welding of dissimilar steels such as 316L to unalloyed and low alloyed steels when Mo is essential. Suitable for service temperatures between –40°C and 300°C. There are no comparable base materials.
Specifications
EN ISO 14343-A
S 23 12 2 L
AWS A5.9
(ER309LMo)
Shielding
DAIKOFLUX 900-W
Positions
PA, PB, PC
Current
DC/AC
Packaging Type
K415 spool and drums.
Asme qualifications
F-No (QW432)
6
A-No (QW442)
8

Ferrite

10-30 FN

Pren

29.98

Hardness

85HRB
Chem. Comp. %
DEFAULT
C
0.01
Mn
1.5
Ni
15
Cr
21.4
P
0.015
S
0.01
Mo
2.6
Si
0.4
Cu
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
600
Yield strength Rp0.2 MPa
350
440
Elongation A (L0=5d0) %
25
35
Impact Charpy ISO-V
-
80J @ 20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.4 mm
Ampere
300A - 400A
Voltage
27V - 33V
Packaging
Ø 2,0÷4,0mm
Packaging Type
K415 spool and drums.
Description

Application


Bearing layers and coated steels: Ideal for overlays on carbon-manganese steel, mild steels, and low-alloy steels. Also used for joining 316L clad plates. Subsequent layers are deposited with selected electrodes to match the cladding material, such as 316L or 318. Perfect also as an intermediate layer before the application of hard facing with chromium carbide.
Dissimilar joints: Dilution tolerance allows the joining of stainless steel 410, 304L, 321, and 316L with mild and low-alloy steels, ideal for reinforcements, brackets, and various accessories. It is advisable to avoid service temperatures above 300 °C. In some applications, a more economical variant such as 309L or 307 may be suitable.
Hardenable steels: The high alloy and ferrite content allows tolerating dilution from various alloyed and hardenable steels, ensuring crack-free welds. Preheat and interpass temperatures vary based on the hardenability of the material. Indicatively, preheating is not required on mild steels, while it can go up to 250 °C on hardenable steels.

Alloy Type

23%Cr-13%Ni-2.5%Mo (309Mo) austenitic stainless steel.

Microstructure

Austenite with ferrite normally in the range 10-30FN.

Materials

Mainly used under high dilution conditions, particularly dissimilar welds between stainless and CMn steels. There are no comparable base materials.

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