DAIKOWT 312

GTAW
  • AUSTENITIC STAINLESS STEELS
312

Description

Rod for dissimilar joints and hard-to-weld steels
This rod is used for the welding of steels with similar composition and for medium and high carbon hardenable steels. It is characterized by a considerable dilution tolerance and proves useful for welding steels of unknown composition. Even with significant dilution, thanks to austenitizing elements like nickel, the microstructure of the deposit remains biphasic and thus highly resistant to cracks and fissures. The deposit may be subject to work hardening and offers good wear resistance. Applications include tool steels, shafts, gear teeth, free machining steels, dissimilar welds, bearing and overlay layers.
Specifications
EN ISO 14343-A
W 29 9
AWS A5.9
ER312
Certifications
CE
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

% 40

Pren

30.33

Hardness

300HV
Chem. Comp. %
DEFAULT
C
0.1
Mn
1.8
Ni
9.5
Cr
30
P
0.02
S
0.005
Mo
0.1
Si
0.4
Cu
0.1
Mechanical Properties
min
variant
Tensile strength Rm MPa
650
790
Yield strength Rp0.2 MPa
450
640
Elongation A (L0=5d0) %
15
10
Impact Charpy ISO-V
-
50J @ 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
product.packaging_types.product.packaging_types.product.packaging_types.5kg carton tube
product.packaging_types.product.packaging_types.product.packaging_types.5kg carton tube
312
Description

Application

Designed for welding hardenable steels with medium and high carbon content, with or without specific requirements, such as tool steels, shafts, gears, free-cutting steels, dissimilar alloys, bearing layers, overlays, and other similar applications. The combination of high alloy content and ferrite (40-50 FN) ensures exceptional tolerance to dilution across a wide range of hardenable steels and alloys, even with minimal or no preheat. It is particularly effective for welding free-cutting steels or steels with a low Mn:S ratio (especially if <20), where other welding solutions may not prevent hot cracking due to boundary liquation in the fusion zone. The weld deposit is prone to work hardening, providing excellent wear and friction resistance. It is also effective against corrosion and high temperatures up to about 1000 °C. However, it is not recommended for structural applications above 300 °C or for welds requiring post-weld heat treatment due to the risk of embrittlement. Not indicated for heavy joint filling, nor for sub-zero applications where high notch toughness is required.

Alloy Type

Austenite-ferrite weld metal composition of nominally 29%Cr-9%Ni for dissimilar joints and difficult to weld steels.

Microstructure

Duplex austenite-ferrite microstructure with about 40% ferrite.

Materials

Medium and high carbon hardenable steels, tool steels and free-cutting steels.

Welding & PWHT

The procedure varies based on the base material. Preheat is generally not necessary for small components and bearing layers, but is recommended for thicker high carbon steels to prevent quench cracking in the HAZ and to control maximum hardness, between 100-250 °C. Although 29.9 alloys offer good high-temperature oxidation resistance, the high ferrite content weld metal is susceptible to 475 °C embrittlement at temperatures above 300 °C and sigma phase embrittlement at high temperatures. Therefore, this alloy is not suitable for high-temperature structural applications or where PWHT is expected.

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