DAIKOWT 307Si

GTAW
  • AUSTENITIC STAINLESS STEELS
307

Description

Solid rod for dissimilar joints and buffer layers
Mixed welding applications including the welding of C-Mn, stainless, hardenable and armour steels to themselves or each other. Suitable also for depositing stress relaxing buffer layers on crack sensitive base metals and hardfacing jobs. Weld metal has a high degree of corrosion resistance and resistant to operating temperatures up to 300°C and non-scaling up to 850°C. Resistance to hot cracking is provided by the high manganese content. The increased silicon results in increased weld pool fluidity to give a smooth deposit appearance.
Specifications
ISO 14343-A
W 18 8 Mn
AWS A5.9
(ER307Si)
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)
-

Ferrite

~5 FN

Pren

18.525
Chem. Comp. %
DEFAULT
C
0.085
Mn
7
Ni
8
Cr
17.7
P
0.02
S
0.01
Mo
0.25
Si
0.85
Cu
0.25
Mechanical Properties
min
variant
Tensile strength Rm MPa
500
620
Yield strength Rp0.2 MPa
350
420
Elongation A (L0=5d0) %
25
40
Impact Charpy ISO-V
-
50J @ -80°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
307
Description

Application

These consumables are versatile for mixed welding applications, including mild, stainless, hardenable, and armor steels, with or without preheat. Their high manganese content provides tolerance to dilution, resisting hot cracking. This makes them a viable alternative to high nickel weld metal in joints between cast iron and stainless steels. Post-weld heat-treated weldments maintain ductility with satisfactory toughness down to -50°C. They offer reasonable scaling resistance up to 850°C. These consumables can function as buffer layers for welding or reclaiming 13% Mn steel in rock crushing plants and earth-moving equipment. They also work well as buffer layers on cast iron before hard surfacing. Additionally, they serve as surfacing consumables, work-hardening from 200 to 400 HV, suitable for repairing alloy rails, crossing parts, frogs, etc., without requiring preheat. However, note that the work-hardening rate is lower than 13% Mn steel, and overlays of more than one layer may collapse under heavy rolling loads.

Alloy Type

Strong tough austenitic weld metal composition for dissimilar joints and buffer layers.

Microstructure

Consists of austenite with approximately 5FN.

Materials

Dissimilar combinations of C-Mn, stainless, hardenable, wear-resistant and armour steels. Suitable for 13% Mn steel also known as Hadfield steel.

Welding & PWHT

Preheating is typically unnecessary unless dealing with substantial section thickness, with an exception for higher carbon hardenable steels where consideration of Heat-Affected Zone (HAZ) properties in relation to service conditions is imperative. When welding 13%Mn steels, the objective is to minimize embrittlement and cracking, necessitating the implementation of specific controls. These controls include avoiding preheating, restricting the maximum interpass temperature to 150°C, adhering to low heat input practices, employing small weld beads, and resorting to water cooling if deemed necessary.

DO YOU NEED HELP?

Go to our dedicated section or contact us
Daiko supporting the environment
Questo sito si avvale di cookie necessari al suo funzionamento ed utili alle finalità illustrate nella cookie policy.

Carrello

Il carrello è vuoto