DAIKOWT 309LMo

GTAW
  • AUSTENITIC STAINLESS STEELS
309LMo

Description

Rod with 23% Cr – 13% Ni – 2.5% Mo
Rod primarily used in high dilution conditions, especially for welding dissimilar joints between duplex steels, stainless steels, and low-alloy steels. It provides excellent wettability and crack resistance characteristics. It is ideal for overlay welding of unalloyed and low-alloy steels, as well as for joining dissimilar steels such as 316L to unalloyed and low-alloy steels, where the presence of molybdenum is essential. Suitable for service temperatures between -40 °C and +300 °C.
Specifications
EN ISO 14343-A
W 23 12 2 L
AWS A5.9
(ER309LMo)
Shielding
I1
Positions
PA, PB, PC, PD, PE, PF
Current
DC-
Packaging Type
5kg carton tube
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
1.6 mm
2.4 mm
Ampere
80A - 100A
110A - 160A
Voltage
-
-
Packaging
Ø 1,0÷4,0 mm
Ø 1,0÷4,0 mm
Packaging Type
5kg carton tube
5kg carton tube
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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