G-TECH 309LMoR

SMAW
  • AUSTENITIC STAINLESS STEELS
309LMo

Description

Rutile coated electrode for309Mo austenitic stainless steels
Electrodes mainly used under high dilution conditions, particularly dissimilar welds between stainless and CMn steels. The addition of 2.0 percent to 3.0 percent molybdenum increases its pitting corrosion resistance in halide-containing environments. The primary application for this filler metal is surfacing of CMn steel or low alloy steel to improve their corrosion resistance. High current carrying capacity, minimum spatter formation and virtually self-cleaning slag produce a concave bead with minimal ripple as well as a smooth and clean weld profile.
Specifications
ISO 3581-A
E 23 12 2 LR
AWS A5.4
E309LMo-17
Shielding
-
Positions
PA, PB, PC, PD, PE, PF
Current
DC+, AC
Packaging Type
Carton box
Asme qualifications
F-No (QW432)
5
A-No (QW442)
8

Ferrite

10-30 FN

Pren

31.75

Hardness

85HRB
Chem. Comp. %
DEFAULT
C
0.03
Mn
0.8
Ni
12.5
Cr
23.5
P
0.015
S
0.02
Mo
2.5
Si
0.6
Cu
0.15
Mechanical Properties
min
variant
Tensile strength Rm MPa
550
650
Yield strength Rp0.2 MPa
350
450
Elongation A (L0=5d0) %
25
30
Impact Charpy ISO-V
-
48J @ -20°C
Impact Charpy ISO-V
-
-
Welding Parameters
2.5 mm
3.2 mm
4 mm
5 mm
Ampere
50A - 80A
80A - 110A
110A - 150A
160A - 210A
Voltage
-
-
-
-
Packaging
56 pcs/kg
28 pcs/kg
19 pcs/kg
12 pcs/kg
Packaging Type
Carton box
Carton box
Carton box
Carton box
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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