DAIKOWM 309LMo

GMAW
  • 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
ISO 14343-A
G 23 12 2 L
AWS A5.9
(ER309LMo)
Shielding
M12, M13
Positions
PA, PB, PC, PD, PE, PF, PG
Current
DC+
Packaging Type
Drums, B300, D200 and D100 spools.
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
1 mm
1.2 mm
Ampere
160A - 220A
200A - 270A
Voltage
25V - 29V
26V - 30V
Packaging
Ø 0,8÷1,6mm
Ø 0,8÷1,6mm
Packaging Type
Drums, B300, D200 and D100 spools.
Drums, B300, D200 and D100 spools.
Description

Application

Typically utilized for buffer layers and overlays on C-Mn, mild steel, or low alloy steels, and for joining 316L clad plates. Subsequent layers are added with an appropriate filler to align with the cladding, such as 316L or 318. Additionally, it functions as a buffer layer before engaging in hardsurfacing with chromium carbide types. Its ability to tolerate dilution is harnessed when joining stainless types 410, 304L, 321, and 316L to mild and low alloy steels, including stiffeners, brackets, and other attachments. Service temperatures exceeding 300°C are generally avoided. For some applications, a more economical alternative like 309L or 307 may be suitable. The high level of alloying and ferrite content allows dilution from a wide range of alloyed and hardenable steels, ensuring crack-free welds. Preheat and interpass temperatures are influenced by the base material hardenability, with no preheat typically required for mild steels, and it can extend up to 250°C for 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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