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Brand: Böhler Welding
Böhler Thermanit MTS 3 LNi EB91 P91 Submerged Arc Wire
Description
P91 creep-resistant SAW wire for power generation
Böhler Thermanit MTS 3 LNi is a solid wire for submerged arc welding of creep-resistant P91 steel in power generation, with the data sheet noting a limited Mn plus Ni content below 1 %. It is classified AWS A5.23 / SFA-5.23 EB91 and EN ISO 24598-A S S ZCrMo91. The typical analysis is a modified 9Cr-1Mo composition with vanadium, niobium and nitrogen, so the weld metal matches P91 base material in main steam piping, headers, superheater and reheater components.
Technical specifications
| Parameter | Specification |
|---|---|
| Product type | SAW wire, low alloyed, creep resistant, solid |
| AWS classification | A5.23 / SFA-5.23 EB91 |
| EN ISO classification | 24598-A S S ZCrMo91 |
| Typical wire analysis, wt % | C 0.11; Si 0.25; Mn 0.65; Cr 9.0; Mo 0.95; V 0.20; Nb 0.06; N 0.045 |
| Special feature | Mn + Ni below 1 % |
| Application | Creep-resistant P91 steel in power generation |
| Diameters, inch (US data sheet) | 3/32; 1/8 |
| Approvals on data sheet | None listed |
Flux and procedure
For the related Thermanit MTS 3 wire, Böhler’s global data sheet recommends , and Marathon 543 is described as a flux for P91, P92 and similar 9 % Cr steels. For this LNi version the US data sheet itself gives no flux, so confirm the pairing with your WPS. The usual P91 discipline applies: controlled preheat and interpass range, defined cooling before PWHT, tempering at the qualified temperature, and hardness or impact checks required by the code. A restricted Mn plus Ni content raises the temperature at which the weld metal begins to transform on heating, which leaves more margin when the post-weld treatment is performed, a point that depends on the specification of your project.
| Related Böhler SAW wire | AWS / EN ISO class | Typical steel |
|---|---|---|
| Union S 2 CrMo | EB2R / S S CrMo1 | 1.25Cr-0.5Mo boiler and vessel steel |
| Union S 1 CrMo 2 | EB3R / S S CrMo2 | 2.25Cr-1Mo, grade 22 hydrocrackers |
| Union S 3 NiMo 1 | EF3 / S3Ni1Mo | Fine-grained steels, Ni-Mo wire |
Storage and wire handling
Copper-coated SAW wire protects itself from rust only while it stays dry and clean. Keep spools and coils in their original packing until use, store them off the floor in a dry room, and do not leave an opened spool on the machine overnight in humid conditions. Surface rust and dust shorten contact tip life, disturb feeding and add hydrogen to the weld. Before ordering, confirm the diameter, spool or coil type and the certificate level (for example EN 10204 type 3.1) that your project requires.
Documents and quotation
The Böhler Welding data sheet for Thermanit MTS 3 LNi (SAW, US edition, 05/2021) is attached. See the SAW Wire category. For a quotation, send diameter, packaging, quantity and the certificate and PMI requirements.
Datasheets & Documents
- Datasheet Böhler Welding Thermanit MTS 3 LNi SAW wire data sheet (US edition, 05/2021) Download
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About brand
Böhler Welding is the welding consumables brand of voestalpine Böhler Welding, part of the voestalpine group, with a portfolio that covers stick electrodes, TIG rods, solid wires, gas-shielded and self-shielded flux-cored wires and submerged-arc wires and fluxes. The company states more than 100 years of experience. Seven Star LLC, an independent supplier in Muscat, lists Böhler Welding consumables and welding machines, including pipeline electrodes, and sources Böhler Welding consumables for fabricators and pipeline contractors.
Böhler Welding product groups
Beyond the consumables above, Böhler Welding lists strip cladding, wire arc additive manufacturing, metal powders, arc spraying cored wires, ceramic weld backing, brazing consumables and welding automation such as orbital welding and collaborative robots. The pipeline range includes cellulosic FOX CEL electrodes and basic vertical-down FOX BVD electrodes for large-diameter line pipe.
Ordering Böhler Welding consumables: what we need
Give the product name, the AWS or EN classification, the diameter and length, and the packaging you need. For pipeline electrodes also state the pipe grade, wall thickness, welding position and whether sour-service test values are required, because the Böhler Welding data sheets note that some test values are available on request.
Related products
Frequently Asked Questions
What is the classification of Thermanit MTS 3 LNi?
AWS A5.23 EB91 and EN ISO 24598-A S S ZCrMo91.
Which steel does it weld?
Creep-resistant P91 steel in power generation.
What does LNi mean on this wire?
The data sheet notes Mn plus Ni below 1 %.
Which diameters does the US sheet list?
3/32 and 1/8 inch.
Which flux is recommended?
Marathon 543 for the related Thermanit MTS 3 wire; confirm the pairing for your WPS.
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