Which Ferroalloy Goes Into Which Welding Consumable

Every welding consumable is a small chemical plant that runs for a few seconds at a time. It has to generate a shielding atmosphere, strip oxygen and nitrogen out of a molten pool, form a slag with the right melting range and viscosity, deliver a precise alloy chemistry into a deposit that is solidifying while it is still being heated, and do all of that while producing an arc that a welder finds pleasant to use.

The raw materials that make this possible are a short list of ferroalloys, metal powders and minerals. What varies between an E6013 and an E11018-M is not really the ingredients — it is the proportions, the grades, and the physical form. This article maps the list onto the classifications, so that a consumable manufacturer, a distributor or a technically-minded buyer can see at a glance which materials belong in which product.

One caveat before we start: exact formulations are proprietary and vary considerably between manufacturers. Everything below describes the typical raw material basket for each class, which is what you need in order to plan sourcing. It is not a recipe.

1. Anatomy of a welding consumable

Shielded metal arc (stick) electrodes consist of a core wire — usually a plain low-carbon rimmed steel wire for carbon steel electrodes — with an extruded flux coating around it. For carbon and low-alloy electrodes, almost all of the alloying is carried in the coating, not the wire, because it is far cheaper to change a coating formulation than to stock a dozen wire chemistries. For stainless electrodes the logic reverses: the core wire is normally a matching stainless composition, with the coating making adjustments.

Flux cored wires are a formed steel strip wrapped around a powder core. Everything the coating would have supplied has to be inside that tube.

Submerged arc splits the job: a solid or cored wire supplies the metal and much of the alloy, while a separate granular flux, poured ahead of the arc, supplies the shielding and slag — and, depending on its design, may also add or remove alloying elements.

2. The five functional families of raw material

3. The sourcing matrix

4. Stick electrodes, class by class

Cellulosic — E6010, E6011 (AWS A5.1)

The pipeline welder's electrode. Around a quarter to a third of the coating is organic cellulose, which decomposes in the arc to a hydrogen-rich reducing atmosphere. That gives a forceful, deeply penetrating arc that runs vertical-down at speed, and very little slag. The hydrogen content is inherently high, so these are emphatically not low-hydrogen consumables.

Metallic basket: modest — medium carbon ferro manganese as the principal deoxidiser and alloy, a small ferro silicon addition, rutile and silicates for the small amount of slag. Iron powder is essentially absent, because it would kill the arc characteristics that define the class. E6011 substitutes potassium compounds for sodium to allow AC operation.

Rutile — E6012, E6013, E7014, E7024 (AWS A5.1)

The general-purpose family, built on titanium dioxide. Rutile gives a smooth, quiet, easily struck arc, a fluid and easily detachable slag and an attractive bead — which is why E6013 dominates general fabrication and maintenance work worldwide. Penetration is shallow and toughness is moderate.

Metallic basket: rutile plus silicates and carbonates; medium carbon ferro manganese and ferro silicon as deoxidisers; and iron powder in increasing quantity as you move up the family. E7014 carries roughly 30% iron powder in the coating for a higher deposition rate at the cost of some positional capability; E7024 carries around 50% and is a flat and horizontal-fillet electrode with very high deposition and a self-releasing slag.

Basic / low hydrogen — E7016, E7018, E7028, E7048 (AWS A5.1)

The structural workhorses. The coating is built on calcium carbonate and fluorspar. Calcium carbonate decomposes to CO₂ for shielding and CaO for the slag; fluorspar lowers the slag melting point and, importantly, reacts with hydrogen to form HF, which is swept away rather than dissolving in the weld pool. The result is a low oxygen, low hydrogen deposit with excellent low-temperature impact toughness — and a coating that must be baked and kept dry, because it will reabsorb moisture.

Metallic basket: this is where the specialty powders concentrate. Low carbon ferro manganese for manganese without carbon; stabilised and atomized ferro silicon for deoxidation without gassing the silicate-bound wet mix; iron powder at roughly 25–40% for deposition rate (E7018 is nominally an iron powder low-hydrogen electrode); and frequently ferro titanium and small aluminium additions as secondary deoxidisers and nitrogen scavengers, with ferro titanium also helping to generate the fine inclusion population on which acicular ferrite nucleates.

Low alloy — AWS A5.5

Same coating systems, different alloy content. The suffix tells you what to buy:

• -B2 (1.25Cr–0.5Mo), -B3 (2.25Cr–1Mo): creep-resistant electrodes for power plant and refinery piping. Basket adds low carbon ferro chrome and ferro molybdenum.
• -C1, -C2, -C3 (nickel-bearing): low-temperature toughness grades. Basket adds nickel powder.
• -A1 (0.5Mo): ferro molybdenum only.
• -M series (E9018-M, E11018-M): high-strength military and structural specifications. Basket combines nickel, molybdenum and small chromium additions, with tight control of manganese and silicon.
• Weathering grades (-W): copper, chromium and nickel additions.

Stainless — AWS A5.4

Here the alloy mostly lives in the core wire, which is drawn to a matching or slightly over-alloyed composition. The coating is typically a lime–titania or titania system, and its metallic additions fine-tune the deposit: low carbon ferro chrome, nickel, ferro molybdenum for 316-type deposits, and ferro niobium for stabilised grades such as 347. Carbon control is severe, because carbon promotes chromium carbide precipitation and sensitisation — which is why "L" grades exist and why every metallic addition to a stainless electrode has to be a low-carbon grade.

Hardfacing — AWS A5.13 and A5.21

The most ferroalloy-intensive family by a wide margin, because here the alloys are the product rather than a trace adjustment. Depending on the wear mechanism being addressed:

• Abrasion resistance — high carbon ferro chrome in large quantity to form chromium carbides, often with ferro boron, ferro vanadium, ferro niobium and ferro molybdenum to generate additional hard phases; tungsten carbide for extreme abrasion.
• Impact and work-hardening — austenitic manganese deposits at 12–16% Mn, built from high carbon ferro manganese and manganese metal, for rail crossings, crusher components and dredge parts.
• Metal-to-metal wear and build-up — moderate chromium and molybdenum martensitic deposits.

Cast iron — AWS A5.15

Nickel and nickel–iron cored electrodes, with graphite in the coating, designed to give a soft, machinable, crack-tolerant deposit on a substrate that cracks readily.

5. Flux cored wires, class by class

Flux cored wire classifications (AWS A5.20 for carbon steel, A5.29 for low alloy, A5.22 for stainless, and the combined A5.36 system) sort into four practical families.

Cored wire families and their fill chemistry

Scroll the table sideways to see every column

Two things follow from this for a powder supplier. First, self-shielded wires are the largest per-tonne consumers of aluminium and magnesium powder in the welding industry, because those elements are doing the nitrogen-fixing work that a shielding gas would otherwise do. Second, metal cored wires are the most demanding on powder flow and consistency, because with almost no slag system, the deposit chemistry is entirely a function of the fill.

Low-alloy and stainless cored wires extend the same logic: ferro chrome and nickel for stainless, ferro molybdenum and nickel for creep-resistant and high-strength wires, and ferro chrome, ferro boron, ferro vanadium and ferro niobium for hardfacing cored wires, which are now a very large part of the wear-plate and component-rebuild market.

6. Submerged arc: wire, flux and the neutrality question

Submerged arc consumables are specified as a wire–flux combination, because the flux is not chemically inert. Fluxes are classified by their tendency to alter deposit chemistry as welding parameters change:

• Neutral fluxes produce a deposit chemistry that stays close to the wire chemistry regardless of voltage. Used for multipass welding of thick sections.
• Active fluxes contain deliberate additions of ferro manganese and ferro silicon and transfer them to the weld, which improves resistance to porosity on rusty or scaled plate — but the amount transferred rises with voltage, so chemistry drifts if parameters are not controlled. Best for single or two-pass welds.
• Alloy fluxes carry substantial ferroalloy additions and are used with plain carbon wire to produce low-alloy deposits — an economical way to make alloy welds without stocking alloy wire.

Fluxes are made either as fused types (melted, quenched and crushed — glassy, non-hygroscopic, but unable to carry ferroalloys because they would oxidise in the melt) or agglomerated / bonded types (dry-mixed, bonded with silicate and baked at low temperature — able to carry deoxidisers and ferroalloys, but more hygroscopic). This is why essentially all alloying SAW fluxes are agglomerated, and why agglomerated flux storage and re-drying discipline matters.

7. What each element is actually doing

8. Sourcing implications

Reading the matrix as a purchasing document rather than a technical one produces a few clear conclusions.

• Ferro silicon and ferro manganese are the two universal materials. They appear in almost every column. If a plant qualifies only two powders rigorously, these are the two — and the qualification should cover form (atomized, stabilised, milled) and sieve analysis, not just assay.
• Iron powder volume tracks your product mix, not your tonnage. A shift from E6013 to E7018 and E7024 changes iron powder consumption dramatically.
• Carbon grade is the single most common specification error. High carbon ferro manganese and high carbon ferro chrome are cheaper and entirely wrong for low-hydrogen, stainless and toughness-critical products — and entirely right for hardfacing.
• The specialty ferroalloys — Ti, Mo, V, Nb, B, W — are low-volume, high-value and long-lead. They deserve dual sourcing and safety stock far more than the commodity grades do.
• Moisture control is a product requirement, not warehouse housekeeping. For basic electrodes, low-hydrogen cored wires and agglomerated SAW fluxes, moisture that arrives with a powder ends up as diffusible hydrogen in a customer's weld.
• Change control matters more than price. A qualified consumable formulation is sensitive to sieve analysis and morphology. Insist that suppliers notify you before changing process route, and re-qualify when they do.

The bottom line

There is no mystery about which ferroalloy goes into which consumable — there is a logic, and it runs from the shielding system, to the slag system, to the deposit chemistry the classification demands. Work down that chain and the raw material basket falls out of it. AIM ALLOYS LLP has manufactured powders for the Indian welding consumables industry for over three decades and supplies most of the materials in the matrix above to customer-specific chemistry and sieve analysis. If you are developing a new product line, send us the classification you are targeting and we will tell you what we would recommend.