AWS A5.14 / ASME SFA-5.14 · Nickel alloy wire and rod (GMAW / GTAW)

Alloy C-276 Welding Wire (ERNiCrMo-4)

ERNiCrMo-4 is a low-carbon nickel-chromium-molybdenum filler metal of the Alloy C-276 type, carrying nominally 16 % chromium, 16 % molybdenum and 3.5 % tungsten, used for welding and overlaying UNS N10276 and comparable alloys in aggressively corrosive service — sour natural gas recovery, flue gas scrubbers, chlorine and hypochlorite, sulphuric acid coolers — with weld metal typically giving 490 to 540 MPa yield and retaining 140 J or more at −196 °C.

Alloy C-276 — UNS N10276 / 2.4819, sour gas, reducing acids
Nickel alloy wire and rod (GMAW / GTAW)
EN ISO 18274 S Ni 6276
4 ESAB grades

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Price on request. POFIS is an ESAB Authorized Distributor & Service Centre in Abu Dhabi — quotations include confirmed lead time and delivery terms.

The designation

What ERNiCrMo-4 means

ER: A bare wire or rod under AWS A5.14, usable as MIG electrode or TIG filler depending on the form supplied.
Ni: Nickel-based. Nickel is the balance of the alloy, giving immunity to the chloride stress corrosion cracking that austenitic stainless steels are vulnerable to.
Cr: Nominally 16 % chromium — lower than Alloy 625 at 22 %. Chromium resists oxidising attack, and this is the axis on which C-276 gives ground to 625 and to Alloy 22.
Mo: Nominally 16 % molybdenum, the defining feature. Against 9 % in Alloy 625 and 2 to 3 % in 316L, this is what gives C-276 its resistance in reducing media and its very high pitting and crevice resistance.
W: Approximately 3.5 % tungsten, which reinforces the molybdenum contribution to localised corrosion resistance. C-276 carries no niobium, unlike 625.
-4: The composition designator. Within the NiCrMo family, -3 is 625, -4 is C-276, -10 is Alloy 22, -13 is Alloy 59 and -14 is Alloy 686. Each targets a different corrosive environment and substituting one for another on familiarity is a recognised and expensive error.

Reading the ERNiCrMo-4 designation, left to right.

How it behaves

ERNiCrMo-4 in practice

Oxidising versus reducing is the whole selection question

Nickel alloy choice turns on which kind of corrosive attack the service presents. Chromium protects against oxidising conditions; molybdenum protects against reducing ones. C-276 carries 16 % molybdenum against 625's 9 %, and 16 % chromium against 625's 22 % — it has deliberately traded oxidising performance for reducing performance. ESAB describes it as having excellent wet corrosion resistance in oxidising and especially in reducing media. If the service chemistry is not known with confidence, that is the thing to establish before anything else.

Sour gas service

ESAB names the recovery of sour natural gas directly as an application, along with components in sour-gas service. Hydrogen sulphide environments are reducing, which is exactly where C-276 is strongest, and the nickel base removes the chloride stress corrosion cracking vulnerability that rules austenitic stainless out of the same duty. For UAE and wider Gulf gas processing this is the most relevant single sentence in the chapter.

The other named applications

Beyond sour gas, ESAB lists chemical processing, pollution control, pulp and paper, waste treatment, bleaching vessels, flue gas scrubber systems, sulphuric acid coolers, and chlorine, hypochlorite and chlorine dioxide atmospheres. The common thread is halogen chemistry and reducing acids — the environments where even a 6Mo super-austenitic stainless or a super duplex will not survive, and where the economics of a nickel alloy stop being a question.

Cryogenic toughness comes free

Like 625, C-276 weld metal stays tough to very low temperature: ESAB publishes 175 J at −196 °C for OK Tigrod NiCrMo-4 and 200 J for Exaton Ni56 in TIG form. ESAB also lists 9 % nickel steel and similar high-toughness low-temperature steels among the parent materials for these wires. The alloy is rarely bought for cryogenic duty alone — 625 is cheaper for that — but where a component sees both cold and aggressive chemistry, it covers both.

Dilution is the overlay failure mode

As with any nickel overlay on steel, iron picked up from the parent dilutes the chromium, molybdenum and tungsten that the surface exists to provide. On C-276 the stakes are higher because the applications are more aggressive and the alloy is more expensive. Overlay procedures specify a maximum iron content at a stated depth, and meeting it generally means two layers, controlled heat input and disciplined bead placement. A diluted C-276 surface is not C-276.

What POFIS supplies

ESAB ERNiCrMo-4 grades

Every grade below carries the ERNiCrMo-4 classification, which is why a WPS naming ERNiCrMo-4 can be satisfied by any of them. They are not interchangeable in practice — the differences in current type, hydrogen level and impact toughness are what decide which one belongs on your job. Figures are the manufacturer's typical as-welded values.

**ERNiCrMo-4 grades supplied by POFIS** — typical as-welded properties. Blank cells are values the manufacturer does not publish for that grade, not zeros.
Grade	Classification	Yield	Tensile	Elong.	Impact (lowest published)
Exaton Ni56 (GTAW) POFIS recommends	ERNiCrMo-4 (AWS A5.14) S Ni 6276 NiCr15Mo16Fe6W4 (EN ISO 18274)	540 MPa	780 MPa	44 %	200 J at −196 °C
Exaton Ni56 (GMAW)	ERNiCrMo-4 (AWS A5.14) S Ni 6276 NiCr15Mo16Fe6W4 (EN ISO 18274)	500 MPa	735 MPa	43 %	140 J at −196 °C
OK Tigrod NiCrMo-4	ERNiCrMo-4 (AWS A5.14) S Ni 6276 NiCr15Mo16Fe6W4 (EN ISO 18274)	530 MPa	760 MPa	44 %	175 J at −196 °C
OK Autrod NiCrMo-4	ERNiCrMo-4 (AWS A5.14) S Ni 6276 NiCr15Mo16Fe6W4 (EN ISO 18274)	490 MPa	732 MPa	42.5 %	112 J at −196 °C

Exaton Ni56 (GTAW) ERNiCrMo-4 (AWS A5.14)

The dedicated C-276 TIG grade and the strongest and toughest on this page: 540 MPa yield, 780 MPa tensile, 240 J at room temperature and 200 J at −196 °C. The grade ESAB names for sour gas recovery, scrubbers and chlorine service.

Alloy type: Alloyed nickel — 16 % Cr, 16 % Mo, 3.7 % W, 5.9 % Fe, low C
Type: TIG rod (GTAW), shielding I1
Source: ESAB Filler Metal Handbook, page 5-40

Exaton Ni56 (GMAW) ERNiCrMo-4 (AWS A5.14)

The MIG and mechanised form of the same C-276 grade, 0.8 and 1.2 mm, also used for overlay by plasma, hot wire TIG and mechanised TIG. Suited to dissimilar joining of nickel alloys, stainless and low-alloy steels.

Diameters: 0.8 mm, 1.2 mm
Alloy type: Alloyed nickel — 16 % Cr, 16 % Mo, 3.7 % W, 5.9 % Fe, low C
Type: Solid MIG wire (GMAW), shielding I1 / I3 / M12
Source: ESAB Filler Metal Handbook, page 5-30

OK Tigrod NiCrMo-4 ERNiCrMo-4 (AWS A5.14)

Exceptional low-temperature toughness — 175 J at −196 °C and 170 J at −110 °C — with 530 MPa yield under pure argon. For TIG roots in sour or cryogenic service, and for 9 % nickel steel.

Alloy type: Alloyed nickel — 16 % Cr, 16 % Mo, 3.7 % W, 5.9 % Fe, low C
Type: TIG rod (GTAW), shielding I1
Source: ESAB Filler Metal Handbook, page 5-24

OK Autrod NiCrMo-4 ERNiCrMo-4 (AWS A5.14)

The general-purpose solid wire in 1.0 and 1.2 mm under M12 shielding, for high-alloy, heat-resistant and corrosion-resistant steels and 9 % nickel steel, with good resistance to stress corrosion cracking.

Diameters: 1.0 mm, 1.2 mm
Alloy type: Nickel alloy — 16 % Cr, 16 % Mo, 5 % Fe, 3.5 % W, low C
Type: Solid MIG wire (GMAW), shielding M12
Source: ESAB Filler Metal Handbook, page 5-20

Diameters are listed from the manufacturer's deposition data. Ordering part numbers and pack sizes are confirmed with your quotation — send the grade and diameters you need to weldiv@pofis.ae.

Specifying

Which ERNiCrMo-4 grade to specify

For MIG and mechanised welding

OK Autrod NiCrMo-4 is the general-purpose solid wire in 1.0 and 1.2 mm under M12 shielding, giving 490 MPa yield, 732 MPa tensile and 112 J at −196 °C, suited to high-alloy, heat-resistant and corrosion-resistant steels and to 9 % nickel steel.

For TIG roots and manual work

OK Tigrod NiCrMo-4 gives 530 MPa yield and 760 MPa tensile under pure argon, with exceptional low-temperature toughness at 175 J at −196 °C and 170 J at −110 °C. For a root run that stays in sour or cryogenic service, this is the stronger and tougher option.

For the most demanding corrosion duty

Exaton Ni56 is ESAB's dedicated C-276 grade, available for both MIG and TIG, and it is the one whose documentation names the aggressive applications explicitly — sour gas recovery, scrubbers, chlorine and hypochlorite, sulphuric acid coolers. The TIG form gives the highest figures on this page at 540 MPa yield, 780 MPa tensile and 240 J at room temperature. It is also used for overlay by plasma, hot wire TIG and mechanised TIG.

When Alloy 22 is the better answer

In oxidising chloride-containing environments, ESAB states that UNS N06022 — Alloy 22 — is preferred over C-276, with ERNiCrMo-10 as its matching consumable, supplied as Exaton Ni54. The distinction is oxidising versus reducing again. Where the service has both character and the choice is not obvious, that is the point to involve a corrosion engineer rather than default to the familiar alloy.

When 625 is sufficient

C-276 is more expensive than 625 and is not better in every environment — it has less chromium, so it is weaker in oxidising and high-temperature oxidising service, where 625 runs to 980 °C. For CRA overlay on valves and flanges in conventional produced-fluid service, 625 is usually the specified alloy. Reserve C-276 for the chemistry that genuinely requires it.

Storage & handling

Storing and handling ERNiCrMo-4 consumables

Sulphur, lead and zinc embrittle nickel alloys

Contamination from marker pens, cutting fluid, grease, paint and galvanised fixtures causes cracking in nickel weld metal that looks metallurgically inexplicable until the source is traced. Degrease the joint and a generous margin either side, keep the consumable in gloved hands, and keep galvanised clamps and fittings away from the work.

Shielding and backing have to be right

Nickel alloys oxidise readily at welding temperature and the oxide does not self-remove. Gas coverage must extend over the cooling bead, and root runs need effective backing — oxidised root faces on nickel alloy pipework are a common and costly rework item. Confirm the shielding gas against the grade: ESAB specifies M12 for OK Autrod NiCrMo-4, pure argon I1 for the TIG rod, and I1, I3 or M12 for Exaton Ni56 depending on process.

Frequently asked

ERNiCrMo-4 — common questions

What is ERNiCrMo-4 used for?

It is the Alloy C-276 filler metal, used for welding and overlaying UNS N10276 and comparable nickel-chromium-molybdenum alloys in aggressively corrosive service. ESAB names sour natural gas recovery, chemical processing, flue gas scrubbers, bleaching vessels, sulphuric acid coolers, and chlorine, hypochlorite and chlorine dioxide atmospheres. It carries roughly 16 % chromium, 16 % molybdenum and 3.5 % tungsten.

Is ERNiCrMo-4 the same as Hastelloy C-276?

It is the welding consumable equivalent. Hastelloy is a trade name; the material is UNS N10276, also designated 2.4819, and ERNiCrMo-4 under AWS A5.14 is the bare wire or rod that matches it. ESAB supplies it as OK Autrod NiCrMo-4, OK Tigrod NiCrMo-4 and Exaton Ni56.

What is the difference between Alloy 625 and Alloy C-276?

Chromium and molybdenum are traded against each other. Alloy 625 has about 22 % chromium and 9 % molybdenum plus 3.5 % niobium; C-276 has about 16 % chromium and 16 % molybdenum plus 3.5 % tungsten and no niobium. Chromium resists oxidising attack, molybdenum resists reducing attack — so 625 is stronger in oxidising and high-temperature service, and C-276 in reducing media such as sour gas and acid environments.

Which nickel alloy is best for sour gas service?

C-276, welded with ERNiCrMo-4, is the alloy ESAB names for the recovery of sour natural gas and for components in sour-gas service. Hydrogen sulphide environments are reducing, which is where the 16 % molybdenum of C-276 is strongest, and the nickel base removes the chloride stress corrosion cracking vulnerability that rules austenitic stainless out of the same duty.

When should Alloy 22 be used instead of C-276?

In oxidising chloride-containing environments. ESAB states that UNS N06022 — Alloy 22 — is preferred there, with ERNiCrMo-10 as the matching consumable, supplied as Exaton Ni54. The selection comes back to oxidising versus reducing: C-276 is optimised for reducing conditions, Alloy 22 handles oxidising chlorides better.

Can C-276 filler be used on 9 % nickel steel?

Yes. ESAB lists 9 % nickel steels and similar steels with high notch toughness at low temperature among the parent materials for OK Autrod and OK Tigrod NiCrMo-4, and publishes 175 J at −196 °C for the TIG rod. In practice Alloy 625 is more commonly specified for cryogenic duty on cost grounds; C-276 earns its place where the component sees aggressive chemistry as well as low temperature.

What shielding gas is used for nickel alloy welding?

It depends on the grade and process, and the handbook is specific: M12 for OK Autrod NiCrMo-4, pure argon (I1) for OK Tigrod NiCrMo-4, and I1, I3 or M12 for Exaton Ni56 depending on whether it is run as MIG or TIG. Nickel alloys oxidise readily and the oxide does not self-remove, so gas coverage must extend over the cooling bead and root runs need effective backing.

Who supplies Alloy C-276 welding wire in Abu Dhabi?

POFIS supplies the ESAB OK Autrod, OK Tigrod and Exaton nickel ranges from Abu Dhabi across the UAE and the wider GCC, as an ESAB Authorized Distributor and Service Centre, approved ADNOC vendor and ISO 9001 certified supplier. Send the service chemistry — particularly whether it is oxidising or reducing — and we will confirm the alloy before quoting. Email weldiv@pofis.ae.

Procurement & supply

Buying the ERNiCrMo-4 consumables through POFIS

The ERNiCrMo-4 consumables is supplied from Abu Dhabi by Perfect Oilfield & Industrial Supply LLC as an ESAB Authorized Distributor and Service Centre. The information below covers what procurement and QA/QC departments normally need before raising a purchase order.

Lead time

Stock items dispatch from Abu Dhabi within 24–48 hours. Indent items are quoted with a confirmed lead time at the time of offer.

Approved vendor status

POFIS is an approved ADNOC vendor and is listed on the approved vendor lists (AVL) of major operators and EPC contractors across the GCC. We can complete supplier registration and prequalification documentation on request.

Payment terms

Standard credit terms are available to registered corporate accounts. LPO, LC and advance payment are all accepted.

Delivery terms

Delivery across the UAE and the wider GCC. Quotations can be issued on EXW, FOB, CIF or DDP terms to suit your project.

Warranty

Full manufacturer warranty, honoured locally. As an ESAB Authorized Service Centre we carry out warranty work and repairs in Abu Dhabi rather than returning equipment abroad.

Service & spares

In-UAE service, commissioning, operator training and spare parts backing for every machine we supply.

ISO 9001 Certified
Approved ADNOC Vendor
ESAB Authorized Distributor & Service Centre

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