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Brand: Selectarc
Selectarc B84 E8018-C2 3.5% Ni Cryogenic Steel Electrode
Description
3.5% nickel weld metal for cryogenic and LPG service
The Selectarc B84 is a low-hydrogen basic electrode with more than 3% nickel in the deposit. It is designed for fine-grain steels operating between -60 and -80 °C, and the data sheet also states impact energy at -100 °C. Its classification is AWS A5.5 E8018-C2 and ISO 2560-A / EN 499 E 46 6 3Ni B 4 2 H5.
Selectarc names cryogenic and petrochemical industries as the main users, in particular the storage and distribution of liquefied gases and volatile products. Typical equipment includes refrigerated tanks, low-temperature process piping, flare and blowdown lines that can cool sharply during depressurisation, and associated pressure vessels.
Technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / product | Selectarc / B84 |
| Process | SMAW (manual metal arc) |
| AWS classification | A5.5 E8018-C2 |
| ISO / EN classification | ISO 2560-A and EN 499 E 46 6 3Ni B 4 2 H5 |
| Coating | Basic, low hydrogen |
| Typical weld metal, % | C under 0.10, Si 0.3, Mn 0.9, Ni 3.5, P under 0.025, S under 0.025, Fe remainder |
| Yield strength Re | Above 460 MPa |
| Tensile strength Rm | Above 550 MPa |
| Elongation A5 | Above 19% |
| Impact energy KV | Above 80 J at -73 °C; above 30 J at -100 °C |
| Sizes and typical current | 2.5 × 350 mm, 80 A; 3.2 × 350 mm, 115 A; 4.0 × 450 mm, 150 A; 5.0 × 450 mm, 190 A |
| Current type | DC, electrode positive |
| Redrying | 2 h at 350 °C if necessary |
| Post-weld heat treatment | Stress relief 620 °C / 1 h recommended in most cases |
Parent materials
B84 is matched to plate and tube in 3.5% nickel steel. Listed grades are 3.5 Ni 285 and 355 (12N14) to NF A 36-208, 10Ni14, 14Ni6 and 16Ni14 to DIN, and ASTM A203 Gr D and E plate, A352 LC3 castings, A334 Gr 3 tube and A350 LF3 forgings.
These steels are the usual material for ethylene and propane service and for equipment whose minimum design temperature lies below the reach of 1% or 2.5% nickel grades. Using a 3.5% Ni electrode on them keeps strength and Charpy performance of the joint consistent with the base metal. For 5% or 9% nickel steels, where toughness down to -196 °C is needed, nickel-base fillers such as ENiCrMo-3 types are normally chosen instead.
Heat treatment and welding practice
If the electrodes have taken up moisture, redry them for 2 hours at 350 °C. Any preheat depends on the parent metal thickness, and Selectarc recommends a stress relieving treatment at 620 °C for one hour in most cases. Confirm that the PWHT cycle agrees with the base metal specification and the governing code before production.
Toughness at -100 °C is sensitive to weld metal microstructure. Narrow stringer beads, moderate current and tight interpass control favour the fine-grained structure that gives good Charpy values, while oversized weave beads coarsen it. Keep opened electrodes in a heated container, remove slag carefully between runs, and plan impact tests of weld and HAZ at the design temperature as part of procedure qualification. Nickel steels can be sensitive to arc blow from residual magnetism, so demagnetising the joint or adjusting the earth position may be necessary.
Documents and quotation
The Selectarc B84 technical data sheet is attached. For other stick electrodes see our Welding Electrodes category.
Request a quotation with diameters, quantities and certificate requirements.
Datasheets & Documents
- Datasheet Selectarc B84 technical data sheet (EN) Download
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About brand
Selectarc is a French manufacturer of welding and brazing filler metals, headquartered in Grandvillars, France. Its welding activity began in 1952 with Selectarc Industrie, a plant making covered electrodes, and the business is the welding and brazing division of the family group Viellard Migeon & Compagnie. In 2025 Framatome took a 40% stake in the company.
Selectarc welding and brazing products
The welding range covers covered electrodes for carbon, low-alloy, stainless and nickel-base steels, MIG and TIG wires, flux-cored wires and hardfacing products, with brazing alloys made at the former Reboud-Roche foundry. Selectarc lists the nuclear, defence and aerospace industries among its key markets, and welding production is concentrated at its Grandvillars site, which also houses the research laboratory.
Ordering Selectarc filler metals: what we need
Give the product name, for example Selectarc Ni625, and the AWS or ISO classification in your procedure, the diameter and length, and the quantity. Seven Star LLC, an independent supplier in Muscat, checks the grade against the Selectarc technical data sheet and can provide the data sheet and the certificates issued with the order on request.
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Frequently Asked Questions
What is the classification of Selectarc B84?
AWS A5.5 E8018-C2 and ISO 2560-A / EN 499 E 46 6 3Ni B 4 2 H5.
Down to what temperature is it intended?
Selectarc gives a service range of -60 to -80 °C, with impact values stated down to -100 °C.
Which steels does it match?
3.5% Ni steels such as 12Ni14 / 10Ni14 and ASTM A203 Gr D and E, A352 LC3, A334 Gr 3 and A350 LF3.
Is post-weld heat treatment recommended?
A stress relief at 620 °C for 1 hour is recommended in most cases.
What current and sizes are available?
DC+; 2.5, 3.2, 4.0 and 5.0 mm at about 80, 115, 150 and 190 A.
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