Thermanit MTS 4 is a low-alloy, creep resistant submerged arc (SAW) wire. It is used in boiler making, on pressure vessels and petrochemical installations.
The wire works as a set with a matched flux, which decides the mechanical properties of the weld. Its deposit resists creep at elevated temperature.
Classification EN ISO: 24598-A S S CrMoWV12
AWS classification: A5.23 / SFA-5.23 EG
Shielding: flux matched to the wire, no shielding gas
Diameters: 2.5 / 3.0 / 4.0 mm
Plan the preheating and the post weld heat treatment to the WPS for the grade in hand, CrMo steels harden in the heat affected zone. Keep an even flux layer over the arc, too thin a layer exposes the arc and too thick a one spoils the bead shape. Watch the wire stick-out and the position of the head against the weld centre line, under a flux you cannot see the pool and a mistake shows only after the slag is chipped off. Match the diameter to the material thickness and the welding position.
Manufacturer datasheet
Chemical composition and properties from the manufacturer datasheet
Typical weld metal values from the voestalpine Böhler Welding data sheet, issue 02/2022. The minimum or the range guaranteed by the maker is given in brackets. The figures depend on the heat treatment condition and the shielding gas stated in the row and do not replace testing the joint to your own WPS.
Chemical composition, wt.-%
C
Si
Mn
Cr
Ni
Mo
W
V
N
0,25
0,15
0,9
11,2
0,60
0,90
0,50
0,25
0,30
Fits
For which materials and machines
Base materials
Material group: creep-resistant CrMo steels. The exact grades and thicknesses are in the manufacturer data sheet, and for an unusual joint call us, we will pick the filler metal.
Process and machines
Submerged arc wire, works on any sound machine for this process: welders.
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