Thermanit 304 H Cu is a medium alloyed TIG rod for high temperature service. It works on pressure vessels, pipework and austenitic steel structures where corrosion resistance matters.
The base material is 1.4907. The rod also suits cladding runs on steel and is intended for joints working at elevated temperature.
Classification EN ISO: 14343-A W Z 18 16 1 Cu H
AWS classification: A5.9 ER308H (mod.)
Shielding gas: I1
Diameters: 0.8 / 1.0 / 1.2 / 2.0 / 2.4 mm
Approvals: TÜV (11219), CE
Keep the interpass temperature low and the beads narrow, overheating austenitic steel promotes carbide precipitation and distortion. Keep the rod inside the gas shield even after you lift it from the pool, a cold oxidised end will contaminate the next drop. Set the gas post-flow long enough for the pool and the electrode to cool under the shield.
Manufacturer datasheet
Chemical composition and properties from the manufacturer datasheet
Typical all-weld metal values from the voestalpine Böhler Welding datasheet, edition 01/2025. Manufacturer minimum in brackets. Values depend on the heat treatment condition and shielding gas given for each row and do not replace testing of your joint according to your WPS.
Chemical composition, wt.-%
C
Si
Mn
Cr
Ni
Mo
Nb
N
Cu
0,1
0,4
3,2
18
16,0
0,8
0,4
0,2
3,0
Welding data and approvals
Polarity
direct current, electrode negative (DC-)
Shielding gas to EN ISO 14175
I1
Approvals
TÜV (11219), CE
Datasheet edition
01/2025
Mechanical properties of the all-weld metal, typical values
Condition
Yield strength Re, MPa
Tensile strength Rm, MPa
Elongation A, %
Impact energy KV, J at 20 °C
u
380 (min. 350)
590 (min. 550)
25
47
u: untreated, as-welded, shielding gas Ar
Fits
For which materials and machines
Base materials
1.4907
Process and machines
TIG rod, works on any sound machine for this process: welders. Shielding gas: I1: 100 % argon.
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