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.

Products of the line 307

Product name Process AWS specifications EN ISO specifications
DAIKOWT 307 GTAW
AWS A5.9
(ER307)
EN ISO 14343-A
W 18 8 Mn
DAIKOWT 307Si GTAW
AWS A5.9
(ER307Si)
EN ISO 14343-A
W 18 8 Mn
G-TECH 307B SMAW
AWS A5.4
E307-15
EN ISO 3581-A
E 18 9 Mn Mo
G-TECH 307HR SMAW
AWS A5.4
E307-26
EN ISO 3581-A
E 18 9 Mn R 73
G-TECH 307 SMAW
AWS A5.4
E307-16
EN ISO 3581-A
E 18 9 Mn Mo R 12
DAIKOFCW 307 FCAW
AWS A5.22
(E307T0-1/4)
EN ISO 17633-A
T 18 8 Mn R M21 3
DAIKOWM 307Si GMAW
AWS A5.9
(ER307Si)
EN ISO 14343-A
G 18 8 Mn
DAIKOWS 307 SAW
AWS A5.9
(ER307)
EN ISO 14343-A
S 18 8 Mn

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