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Brand: Böhler Welding
Böhler Thermanit Chromo 9 V Mod E9015-B91 P91 Electrode
Description
E9015-B91 electrode for grade 91 creep-strength-enhanced steel
The Böhler Thermanit Chromo 9 V mod is a basic-coated covered electrode for shielded metal arc welding of 9Cr-1Mo-V-Nb steel, classified AWS A5.5 E9015-B91 H4 and EN ISO 3580-A E Z CrMo91 B 4 2 H5. Böhler Welding states a fully tempered martensitic microstructure after post-weld heat treatment, and an application range that covers joint welding of similar-alloyed creep-strength-enhanced ferritic steels such as ASTM grade 91 tube, pipe, plate, forgings and castings in thermal power and petrochemical plants. The composition is optimised for a highly creep-resistant, ductile deposit with a low level of trace elements, and the Mn plus Ni content is held below 1.0 wt % so that the Ac1 temperature stays above 1436 °F.
Technical specifications
| Parameter | Specification |
|---|---|
| AWS classification | A5.5 / SFA-5.5 E9015-B91 H4; A5.5M E6215-B91 H4 |
| EN ISO classification | 3580-A E Z CrMo91 B 4 2 H5; 3580-B E6215-9C1MV H5 |
| Typical analysis, wt % | C 0.1; Si 0.2; Mn 0.8; Cr 9.0; Ni 0.1; Mo 1.1; V 0.2; Nb 0.05; N 0.04 |
| Yield strength, tempered 1400 °F / 2 h | 86 ksi at 68 °F (minimum 77); 60 ksi at 1022 °F (minimum 41) |
| Tensile strength, tempered | 106 ksi at 68 °F (minimum 90); 69 ksi at 1022 °F (minimum 48) |
| Elongation A (L0=5d0) | 19 % at 68 °F (minimum 17); 17 % at 1022 °F (minimum 15) |
| Impact energy ISO-V, tempered | 59 ft-lb at 68 °F (minimum 35); 45 ft-lb at 32 °F (minimum 27) |
| Polarity | DC+ |
| Sizes and current | 3/32 in x 14 in: 70 to 100 A; 1/8 in x 14 in: 100 to 145 A; 5/32 in x 14 in: 140 to 190 A; 3/16 in x 18 in: 160 to 240 A |
| Approvals | None listed on the data sheet |
Base materials and selection
The data sheet names 1.4903 X10CrMoVNb9-1, 1.4955 GX12CrMoVNbN9-1, ASTM grade 91, T91, P91, F91, FP91, WP91 and C12A, 10Cr9Mo1VNbN, and STPA28 and STBA28. This is the stick-electrode member of a P91 welding set: main steam piping, hot reheat lines and headers are typically welded with a TIG root and then SMAW, and the
wire covers the submerged-arc route for thick sections. Procedure qualification for P91 is demanding, as post-weld heat treatment must be done in a narrow temperature window to keep the Ac1 margin, so base the numbers on the code and the welding procedure rather than on the data sheet.| Related Böhler Welding electrode | Classification (AWS A5.1 / A5.5 / A5.4) | Typical use |
|---|---|---|
| FOX DCMS Kb | E8018-B2 H4 | 1 % Cr, 0.5 % Mo boiler, plate and tube steel |
| FOX CM 2 Kb | E9018-B3 H4R | 2.25 % Cr, 1 % Mo refinery and power-plant steel |
| FOX NiMo | E10018-D2 | Cast steel, valves and oil tools |
Handling and what to confirm
No redrying or approvals are given on the data sheet, so ask for the packaging details and the batch certificate type (for example EN 10204 3.1) at quotation. State the pipe or forging grade, wall thickness, diameters in inches or millimetres and the quantity, and whether the order also needs matching TIG rods or wire.
Documents and quotation
The Böhler Welding data sheet for Thermanit Chromo 9 V mod is attached to this page and carries the classifications, analysis, mechanical values and operating data quoted above. Related items are listed under welding electrodes. A quotation needs diameter, pack type, quantity, base material and certificate type.
Datasheets & Documents
- Datasheet Böhler Welding Thermanit Chromo 9 V mod product data sheet (SMAW, US edition) 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 Chromo 9 V mod?
AWS A5.5 E9015-B91 H4 and EN ISO 3580-A E Z CrMo91 B 4 2 H5.
Which steels is it for?
Grade 91 (9Cr-1Mo-V-Nb) steels such as P91, T91, F91 and 1.4903.
Why is the Mn plus Ni content limited?
Below 1.0 wt %, which keeps the Ac1 temperature above 1436 °F according to the data sheet.
Which polarity does it use?
DC positive.
Does the data sheet list approvals?
No approvals are listed.
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