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Thermanit 309L solid MIG/MAG wire: Böhler Welding wire on a BS300 spool, uncoppered
Thermanit, solid MIG/MAG wire, stainless and acid-resistant steels

Thermanit 309L solid MIG/MAG wire

EN ISO classification14343-A G 23 12 L
AWS classificationA5.9 / SFA-5.9 ER309L
Shielding gasM12: Ar with CO2 added (up to 5 %), M13: Ar with O2 added (up to 3 %)
ApprovalsTÜV (19604), DB (43.132.77), CE
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Authorised distributorvoestalpine Böhler Welding
Courier shippingfrom the warehouse in Krotoszyn
Data sheetcomposition, properties, specifications
Wire selectionhelp from a welding engineer
Manufacturer data sheet
Application Specifications Manufacturer datasheet Fits Substitute Bought together
Application

What Thermanit 309L solid MIG/MAG wire is used for

Thermanit 309L is a high-alloyed austenitic stainless solid wire. It works on pressure vessels, process piping and austenitic structures where corrosion resistance counts.

The typical parent material is S500N, and the deposit has an austenitic structure.

  • Classification EN ISO: 14343-A G 23 12 L
  • AWS classification: A5.9 / SFA-5.9 ER309L
  • Shielding gas: M12, M13
  • Diameters: 1.0 / 1.2 / 2.0 mm
  • Approvals: TÜV (19604), DB (43.132.77), CE

Keep the interpass temperature low and the beads narrow, overheating austenitic steel promotes carbide precipitation and distortion. Watch the wire stick-out from the contact tip, too long a one lowers the arc voltage and worsens the fusion. Set the gas flow so the pool is covered over the whole length of the bead, and shield the station when you work in wind. Match the diameter to the thickness and the position, thinner wires are easier to control in constrained positions.

Manufacturer datasheet

Chemical composition and properties from the manufacturer datasheet

Datasheet PDF

Typical weld metal values from the voestalpine Böhler Welding data sheet, issue 01/2025. 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.

Welding data and approvals
Polaritydirect current, electrode positive (DC+)
Shielding gas to EN ISO 14175M1
ApprovalsTÜV (19604), DB (43.132.77), DNV, CE
Datasheet edition01/2025
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 Impact energy KV, J at -80 °C
u 420 (min. 320) 570 (min. 510) 32 (min. 25) 90 (min. 47) 32
  • u: untreated, as-welded, shielding gas Ar + 2.5% CO 2
Fits

For which materials and machines

Base materials
  • S500N
Process and machines

Solid MIG/MAG wire, works on any sound machine for this process: welders. Shielding gas: M12: Ar with CO2 added (up to 5 %), M13: Ar with O2 added (up to 3 %).

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Technical substitute

A substitute for this consumable

We will find a substitute with the same classification, diameter and shielding gas over the phone: +48 669 162 833.

From the same group

Other consumables for the same material

For comparison before you buy. A technical substitute is listed above.

All: Solid MIG/MAG wires