Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide

← Back to Knowledge Center

What is Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

Hastelloy C-4 (AWS ERNiCrMo-7) is a low-carbon nickel-chromium-molybdenum welding wire for welding Hastelloy C-4 and similar alloys. Provides excellent resistance to a wide range of corrosive environments with good weldability.

What welding parameters are recommended for Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

Parameter	GTAW	GMAW
Shielding Gas	Argon (99.995%)	Ar + 2% He or Ar + 2% CO2
Gas Flow Rate	8-15 L/min	15-25 L/min
Wire Diameter	1.6-3.2 mm	0.8-1.6 mm
Current Type	DCEN	DCEP
Welding Position	All positions	Flat / Horizontal

Where is Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide used?

Hastelloy C-4 welding wire is used in a wide range of demanding applications:

• Chemical Processing: Welding of C-4 process equipment and piping.
• Aggressive Media: Welding for environments with mixed acids.
• Flue Gas Systems: Welding of scrubber components.
• Pharmaceutical: Welding of high-purity process systems.
• Pollution Control: Welding of waste gas treatment equipment.

Which product forms are available for Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

Hangbo Alloy Group supplies Hastelloy C-4 welding wire in the following forms:

• TIG Wire: Straight lengths 1000 mm, diameters 1.6 mm, 2.0 mm, 2.4 mm, 3.2 mm.
• MIG Wire: Precision-wound spools (D200, D300), diameters 0.8 mm, 1.0 mm, 1.2 mm, 1.6 mm.
• SAW Wire: Coils for submerged arc welding, diameters 2.4 mm, 3.2 mm, 4.0 mm.

Which standards cover Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

Standard	Description
AWS A5.14	ERNiCrMo-7
ISO 18274	S Ni 6455
EN ISO 18274	S Ni 6455
DIN 1736	SG-NiCr16Mo16

General references: Nickel Institute · AMPP · SAE International · ASTM International

Chemical Composition of ERNiCrMo-7 Welding Wire (wt%)

Element	Content (%)
Nickel (Ni)	Balance
Chromium (Cr)	14.0 – 18.0
Molybdenum (Mo)	14.0 – 17.0
Titanium (Ti)	0.70 max
Iron (Fe)	3.0 max
Carbon (C)	0.015 max

What are the mechanical properties of Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide deposited metal?

Property	Typical Value
Tensile Strength	690 MPa (100 ksi) min
Yield Strength (0.2%)	300 MPa (44 ksi) min
Elongation	35% min
Service Temperature	up to 1040°C (1900°F)

Values above are typical for as-welded Hastelloy C-4 (ERNiCrMo-7) deposited metal under AWS A5.14 classification requirements. Actual results vary with welding process, heat input and shielding gas.

Why Choose Hastelloy C-4 Welding Wire

• Titanium-stabilised with ultra-low carbon, giving exceptional resistance to intergranular corrosion after welding.
• Outstanding thermal stability — retains ductility after prolonged exposure to 650–1040°C.
• Resists strong oxidising acids including nitric acid and mixed acid streams.
• Lower iron content reduces formation of detrimental secondary phases in the weld metal.

What are the best practices for welding Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

Follow these practical guidelines to obtain sound, corrosion-resistant welds with this filler metal:

• No preheat is required; keep interpass temperature below 150°C (300°F).
• Use low heat input (0.5 – 1.5 kJ/mm) with stringer beads to preserve thermal stability.
• Shield with high-purity argon; for GMAW, argon-helium blends improve wetting and bead profile.
• For heavy sections or restraint, consider a buttering layer to absorb shrinkage strain.

How do you select the right filler wire for Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

Hastelloy C-4 (ERNiCrMo-7) is the matching filler for its base alloy and is specified for joints where its particular corrosion or high-temperature performance is required. Match the wire form and diameter to the welding process and section thickness:

• GTAW: 1.6-2.4 mm wire for root passes and thin sections; 3.2 mm for heavy fill.
• GMAW: 0.8-1.6 mm spooled wire for high-deposition fabrication of scrubbers and flue-gas equipment.
• SAW: 2.4-4.0 mm coils for long seams on thick chemical-process vessels.

C-4 is titanium-stabilised with very low iron, so it retains ductility after prolonged exposure to 650-1040°C — choose it over C-276 when the weldment must stay tough in high-temperature service. Compare C-series options in our C-276 vs C-22 comparison.

Which base metals are compatible with Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide?

ERNiCrMo-7 is the matching filler for Hastelloy C-4 and welds C-4 to itself and to other nickel-chromium-molybdenum alloys. Its titanium stabilisation and low iron content make it the preferred choice where the weldment must resist intergranular attack in the as-welded condition at temperatures up to about 1040°C.

How should Hastelloy C-4 (ERNiCrMo-7) Welding Wire Guide be stored, handled and certified?

Nickel-alloy filler metals are sensitive to moisture, surface contamination and trace impurities, so proper storage and handling are essential to weld integrity:

• Store spools and cut lengths in a clean, dry area and keep original packaging sealed until use to avoid condensation and humidity pickup.
• Remove oil, grease, sulphur, lead and phosphorus before welding — these impurities can cause hot cracking or embrittlement in nickel weld metal.
• Use dedicated stainless-steel wire brushes and tools reserved for nickel alloys only, to prevent iron contamination.
• For GTAW, keep the filler within the argon shield and maintain a short arc to prevent oxidation of the hot weld pool.

Hangbo Alloy Group supplies Hastelloy C-4 (ERNiCrMo-7) welding wire with full EN 10204 3.1 material certificates, cast/lot traceability and chemical and mechanical test reports. Contact our sales team for batch-specific certification or technical support.

Frequently Asked Questions

Contact Us for Hastelloy C-4

Hangbo Alloy Group supplies Hastelloy C-4 (ERNiCrMo-7) welding wire with full material certifications. We ensure consistent wire quality with precise diameter control, clean surface finish, and uniform feeding performance.

For quotations, material certifications, or technical consultation, contact our sales team or call +86 13611656360.