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Brand: Böhler Welding
Böhler FOXcore C 9 MV RC E91T1-B91M P91 Flux-Cored Wire
Description
Rutile-basic flux-cored wire for T91 and P91 out-of-position welding
The Böhler FOXcore C 9 MV RC is a rutile-basic flux-cored wire for welding creep-resistant, tempered 9 % chromium steels in turbine, boiler and pipework construction and in the foundry industry, classified AWS A5.29 E91T1-B91M-H4 and EN ISO 17634-A T ZCrMo9VNb P M21 1 H5. Böhler Welding states that the wire is especially designed for the ASTM steels T91 and P91 and for out-of-position welding technology, and that the chemistry meets the low-nickel requirement (Ni plus Mn below 1 wt %). It is the flux-cored route for grade 91 welding; the
wire covers submerged arc and the electrode covers SMAW.Technical specifications
| Parameter | Specification |
|---|---|
| AWS classification | A5.29 / SFA-5.29 E91T1-B91M-H4; A5.36 E91T1-M21PY-B91-H4 |
| EN ISO classification | 17634-A T ZCrMo9VNb P M21 1 H5; 17634-B T69T1-1M21-9C1MV-H5 |
| Typical analysis, M21, wt % | C 0.10; Si 0.2; Mn 0.7; Cr 9.0; Ni 0.2; Mo 1.0; V 0.2; Nb 0.04; N 0.04 |
| Stress relieved 1400 °F / 4 h (EN) | Yield 84 ksi (minimum 82); tensile 104 ksi (100 to 110); elongation 18 % (minimum 14); 44 ft-lbf at 68 °F (minimum 24) |
| Stress relieved 1400 °F / 2 h (AWS) | Yield 86 ksi (minimum 82); tensile 106 ksi (100 to 110); elongation 18 %; 30 ft-lbf at 68 °F (minimum 24) |
| Shielding gas | Argon plus 18 % CO2 |
| Diameter | 0.045 in |
| Power source | Conventional or pulsed; slightly trailing torch, angle about 80 degrees; stick-out 15 to 20 mm; arc length 3 to 5 mm |
| Preheat and interpass | 392 to 572 °F; cool below 176 °F after welding to finish the martensite transformation |
| Post-weld heat treatment | Annealing at 1400 °F for 3 to 10 h; heating and cooling rates below 1022 °F max. 302 °F/h, above 1022 °F max. 176 °F |
| Approvals | TÜV (19235) |
Base materials and selection
Base materials named are 1.4903 X10CrMoVNb9-1, G-X12CrMoVNbN9-1, and ASTM A335 Gr. P91, A336 Gr. P91, A369 Gr. FP91, A387 Gr. 91, A213/213M Gr. T91, A234 WP91 and A182 F91. The data sheet cautions that for greater wall thickness or complex components the possibility of residual stress must be considered. Fabricators typically use a cored wire for fill passes after a TIG root; check the project code and qualify the whole combination, including toughness, which the data sheet states with a minimum of 24 ft-lbf at 68 °F only.
| Related Böhler Welding cored wire | Classification | Typical use |
|---|---|---|
| FOXcore 71 RC | AWS A5.20 E71T-1 family | All-position rutile wire for mild steel, 0.045 to 1/16 in. |
| diamondspark X70 RC-Pipe | AWS A5.29 E91T1-K2M | Rutile NiMn wire for X70 and X80 pipeline welding |
Handling and what to confirm
Confirm base steel, wall thickness, heat-treatment plan, gas, spool format, and whether the project requires separate trace-element or toughness certification, as the data sheet lists only one diameter and a single approval.
Documents and quotation
The Böhler Welding data sheet for FOXcore C 9 MV RC is attached to this page and carries the classifications, analysis, mechanical values and operating data quoted above. Related items are listed under flux-cored welding wire. A quotation needs diameter, pack type, quantity, base material and certificate type.
Datasheets & Documents
- Datasheet Böhler Welding FOXcore C 9 MV RC product data sheet (FCW, US edition) Download
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About brand
Böhler Welding is the welding consumables and equipment brand of voestalpine Böhler Welding, part of the Austrian steel and technology group voestalpine. Its roots go back to 1870, when the brothers Albert and Emil Böhler founded the Böhler company in Vienna; in 1894 they bought the steel works in Kapfenberg, Styria, which became the home of Böhler special steels and, later, Böhler welding filler metals. Welding became a separate division of the newly formed Böhler-Uddeholm group in 1991. voestalpine took over Böhler-Uddeholm in 2007, and the welding business, headquartered in Düsseldorf, Germany, has been part of voestalpine's Metal Engineering Division since 2013.
Böhler Welding company profile
| Origins | 1870, Vienna, Austria: Albert and Emil Böhler found the Böhler company; Kapfenberg steel works acquired in 1894 |
|---|---|
| Welding business | Separate division of Böhler-Uddeholm from 1991 (the same year it acquired UTP) |
| Ownership | voestalpine AG (Linz, Austria), which took over Böhler-Uddeholm in 2007; welding integrated into the Metal Engineering Division in 2013 |
| Headquarters | Düsseldorf, Germany (voestalpine Böhler Welding); Austrian company seated in Kapfenberg |
| Brands in the group | Böhler Welding (joining consumables and welding machines), UTP Maintenance (repair and hardfacing), Fontargen Brazing; product lines such as FOX, Thermanit, Union, diamondspark, FOXcore, Marathon and UV fluxes |
| Product families | Stick electrodes, TIG rods, MIG/MAG solid wires, flux-cored and metal-cored wires, submerged arc wires and fluxes, welding machines and plasma cutters |
Milestones
- 1870: Albert and Emil Böhler found the company in Vienna.
- 1894: The Kapfenberg cast steel works is purchased.
- 1991: Böhler Welding becomes a separate division of Böhler-Uddeholm and acquires UTP.
- 2007: voestalpine makes its takeover offer for Böhler-Uddeholm.
- 2013: The welding business is integrated into voestalpine's Metal Engineering Division as voestalpine Böhler Welding.
Choosing Böhler welding consumables
The filler metal must match the base metal and the service. Carbon steel pipe is often welded with a cellulosic root (FOX CEL+, AWS E6010) because it penetrates well in vertical-down welding, followed by low-hydrogen fill and cap passes (FOX EV 50, E7018-1, or FOX BVD vertical-down electrodes). Creep-resistant chromium-molybdenum steels need matching consumables and controlled preheat and post-weld heat treatment: for example FOX DCMS Kb (E8018-B2) for 1.25Cr-0.5Mo, FOX CM 2 Kb (E9018-B3) for 2.25Cr-1Mo and Thermanit Chromo 9 V Mod for P91. Duplex stainless steel uses an over-alloyed 2209 filler (FOX CN 22/9 N-B, Thermanit 22/09) to keep the ferrite-austenite balance. Low-hydrogen electrodes must be stored dry and re-baked according to the data sheet.
Where Böhler Welding products are used
In Oman and the GCC, Böhler consumables are used on cross-country pipelines, oil and gas facilities, refineries and petrochemical plants, power and desalination plants with P91 and Cr-Mo piping, pressure vessel and tank fabrication, and structural steel work.
Böhler Welding products we list
| Family | Examples |
|---|---|
| Stick electrodes | FOX CEL+ E6010, FOX EV 50, FOX EV PIPE, FOX BVD 85, FOX DCMS Kb, FOX CM 2 Kb, FOX CN 22/9 N-B, Thermanit Chromo 9 V Mod |
| TIG rods | EMK 6, Union ER 80S-B2, Union ER 90S-B3, Thermanit GE-316L, Thermanit 22/09, Thermanit 309L |
| Flux-cored and metal-cored wires | FOXcore 71 RC, diamondspark 52 RC, diamondspark X70 RC-Pipe, FOXcore 316L-T1, FOXcore 2209-T1 |
| Submerged arc wires and fluxes | Union S 2 Si, Union S 3 Si, Union S 1 CrMo 2, Thermanit MTS 3 LNi, UV 418 TT, Marathon 543 |
| Welding and cutting machines | TERRA 500 RC, TERRA NX 400 TLH, TERRA NX 500 PME, SABER 70 CHP |
Ordering Böhler Welding products: what we need
Send the product name and AWS or EN classification (for example FOX EV 50, AWS A5.1 E7018-1), the diameter and the quantity in kg. For project work, tell us the base material, welding process and any certificate needed, such as an EN 10204 3.1 inspection certificate.
Facts checked against voestalpine's published company histories, October 2026.
Browse Böhler Welding products by category: Welding Electrodes, TIG Welding Wire, Flux-Cored Welding Wire, Submerged Arc Welding Wire, Submerged Arc Fluxes, Cellulosic Pipeline Electrodes.
FAQ
Questions about the Böhler FOXcore C 9 MV RC E91T1-B91M P91 Flux-Cored
Answers from our engineering team on installation, compatibility and integration.
01What is the classification of FOXcore C 9 MV RC?
AWS A5.29 E91T1-B91M-H4 and EN ISO 17634-A T ZCrMo9VNb P M21 1 H5.
02Which steels is it designed for?
The ASTM creep-resistant steels T91 and P91, plus similar 9Cr-1Mo-V-Nb steels.
03What preheat and interpass range is given?
392 to 572 °F.
04Which gas and diameter are listed?
Argon plus 18 % CO2 and 0.045 inch.
05Which approval is printed?
TÜV (19235).
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