G-TECH 309L

SMAW
  • AUSTENITIC STAINLESS STEELS
309L

Description

Rutile coated low carbon electrode for dissimilar joining and buffer layer
Its basic-rutile coating ensures an excellent combination of welding performance in all positions, except for vertical down, and a high resistance to cracking providing smooth arc transfer. These electrodes are mainly used under high dilution conditions, particularly dissimilar welds between stainless and C-Mn steels. Also overlays on C-Mn steel or low alloy steel and for joining clad plate. Other application is welding of similar metal joints (23Cr-12Ni type). Excellent weldability with a spatter free arc and self-releasing slag result in a very smooth bead appearance.
Specifications
ISO 3581-A
E 23 12 L R 32
AWS A5.4
E309L-16
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

8-15 FN

Pren

23.83

Hardness

85HRB
Chem. Comp. %
DEFAULT
C
0.03
Mn
0.8
Ni
13
Cr
23.5
P
0.02
S
0.01
Mo
0.1
Si
0.6
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
510
560
Yield strength Rp0.2 MPa
320
400
Elongation A (L0=5d0) %
25
30
Impact Charpy ISO-V
-
45J @ -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

Commonly employed for buffer layers and overlays on CMn, mild steel, or low alloy steels, and for joining 304L/321 clad plates, as well as in dissimilar welds. Subsequent layers are applied using a suitable filler to align with the cladding, such as 308L or 347. In dissimilar joints, the capacity to tolerate dilution is leveraged when joining stainless types 410, 304L, 321, and 316L to mild and low alloy steels, including stiffeners, brackets, and other attachments. Typically, service temperatures exceeding 400°C are avoided. This filler metal is also utilized for welding 12%Cr ‘utility ferritics’ like Cromwell 3CR12, to itself and other steels. If the service demands corrosion resistance below 400°C, it is feasible to weld wrought and cast steels of the 23Cr-12Ni type (e.g., ASTM 309 and CH8, BS 309S24, and 309C30). However, for high-temperature structural service, it is advisable to use weld metal with carefully managed higher carbon and lower ferrite. Preheat and interpass temperatures depend on 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

24%Cr-13%Ni (309L) austenitic stainless for dissimilar joint buffer layers etc.

Microstructure

Austenite with ferrite in the range 8-20FN. GMAW tends to have lower ferrite (8-15 FN) than the MMA and FCW consumables.

Materials

Mainly used under high dilution conditions, particularly dissimilar welds between stainless and CMn steels.

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