AWS Class ER330 MIG & TIG

ER330 TIG Filler Rod & MIG Wire Supplier in India

Name: AWS Class ER330 MIG & TIG
Brand: Nicorex Alloys

Nicorex Alloys is a Mumbai-based ISO 9001 and ISO 14001 certified supplier and stockist of ER330 welding wire, classified under AWS A5.9 and ASME SFA 5.9 as a bare stainless steel electrode and rod for GTAW (TIG) and GMAW (MIG) welding.

ER330 is a high-alloy austenitic stainless steel solid wire for welding wrought and cast materials of the AISI 330 / HT family, a specialised metallic blend of iron, nickel, and chromium. The weld deposit contains ~35% Nickel, 15.5% Chromium, 1.5% Manganese, 0.60% Silicon, and 0.20% Carbon. That high carbon range (0.18- 0.25%) is intentional. ER330 provides superior elevated-temperature creep strength, ensuring structural stability and long-term performance in high-heat industrial applications. The fully austenitic microstructure remains stable at all temperatures with no sigma phase embrittlement and no ductility loss from thermal cycling. Typically, as-welded tensile strength reaches 583 MPa (84,500 psi), yield strength 386 MPa (56,000 psi), and elongation 29%.

ER330 weld metal can withstand carburisation, oxidation, and sudden temperature changes up to 980°C (1800°F), which makes it the main choice for radiant tubes, muffles, retorts, carburising fixtures, and furnace conveyor belts. We stock TIG rods (1.6 to 4.0 mm) and MIG spools (0.8 to 1.6 mm) compatible with AISI 330 and ASTM A297 cast alloys. Every order includes MTC 3.1 certification to ensure full material traceability and industrial quality compliance.

ER330 Welding Wire Specifications

The following table shows the detailed specification table covering classification, process, and dimensional data for ER330

AWS Classification	ER330 per AWS A5.9
Welding Processes	GTAW (TIG), GMAW (MIG), SAW
Polarity	DCEN (GTAW); DCEP (GMAW)
Welding Positions	All: 1G, 2G, 3G, 4G
Shielding Gas (GTAW / GMAW)	100% Ar (GTAW); 75Ar/25He preferred (GMAW)
TIG Rod Diameters	1.6, 2.0, 2.4, 3.2, 4.0 mm
MIG Wire Diameters	0.8, 0.9, 1.2, 1.6 mm
TIG Rod Length	1000 mm (36″)

AWS Classification Explained: What Does ER330 Mean?

The following table provides the full ER330 classification, showing how its high nickel and carbon content set it apart for high-heat applications.

Prefix/Designator	Meaning & Technical Significance
ER	Electrode / Rod: Solid wire suitable for both TIG (GTAW) and MIG (GMAW) processes.
330	35Ni-15Cr Alloy: High Nickel content (34–37%) providing superior resistance to carburization and oxidation.

ER330 is a high-nickel (35% Ni) and chromium (16% Cr) filler metal designed for extreme heat. Its controlled carbon content is essential for maintaining creep strength at service temperatures exceeding standard stainless limits.

Chemical Composition of ER330 Weld Deposit (%)

Refer to the following table for the ER330 chemical composition required for high-temperature welding and technical fabrication.

Material / Element	Carbon (C)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulphur (S)	Copper (Cu)
AWS A5.9 Requirement	0.18 – 0.25%	15.0 – 17.0%	34.0 – 37.0%	0.75% max	1.0 – 2.5%	0.30 – 0.65%	0.03% max	0.03% max	0.75% max

The wire has lower Cr and Si than base metal AISI 330 (Cr 17- 20%, Si 0.75- 1.50%), reducing hot cracking susceptibility in the weld deposit.

Mechanical Properties of ER330 MIG Welding Wire

AWS A5.9 classifies ER330 by chemical composition only. The values below are typical manufacturer data for the as-welded condition.

Property	Tensile Strength	Yield Strength (0.2%)	Elongation	Hardness
Typical Value (As-Welded)	583 MPa (84,500 psi)	386 MPa (56,000 psi)	29%	~85-90 HRB

ER330 retains useful strength above 650°C (1200°F) and still delivers creep-rupture resistance at 870°C (1600°F) that ER308L or ER316L cannot match.

Base Metal Compatibility and ASME Section IX Data for ER330

ER330 is a matching filler for AISI 330 and equivalent high-temperature alloys.

Base Metal	UNS	P-Number	Joint Type
AISI 330 / RA330	N08330	P-45	Similar to P-45
Cast HT (ACI HT)	J94605	—	Wrought-to-cast or cast-to-cast
Cast HK (ACI HK40)	J94204	—	Dissimilar (HT to HK repair)

Recommended Welding Parameters for ER330 TIG & MIG Wire

Consult the following table for the optimised voltage, amperage, and shielding gas settings for both TIG and MIG processes.

GTAW (TIG) Parameters

Thickness	Tungsten	Filler Dia.	Amps (A)	Volts (V)	Gas
0.8- 1.6 mm	1.6 mm	1.6 mm	35- 60	9- 12	100% Ar
1.6- 3.2 mm	1.6- 2.4 mm	1.6-2.4 mm	50- 95	9- 12	100% Ar
3.2- 6.0 mm	2.4- 3.2 mm	2.4- 3.2 mm	75- 150	10- 13	100% Ar
6.0 mm+	2.4- 3.2 mm	2.4- 3.2 mm	95- 200	10- 13	100% Ar

GMAW (MIG) Short-Circuit Parameters

Wire Dia.	Amps (A)	Volts (V)	WFS (in/min)	Thickness	Gas
0.9 mm	70- 90	17- 20	150- 200	1.3- 4.8 mm	75Ar/25He
1.2 mm	75- 160	18- 22	175- 225	3.2- 19 mm	75Ar/25He

Use convex stringer beads only; concave beads crack. Fill all craters completely. Keep interpass below 121°C (250°F). No preheat required. Always add filler metal with GTAW. Do not use Ar-O₂ or 75Ar/25CO₂ gas for MIG. Use dedicated stainless steel brushes and grinding wheels to prevent carbon steel contamination.

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Industrial High-Temperature Applications of ER330 Filler Wire

The following are the industrial applications of ER330:

Heat Treatment: Radiant tubes, muffles, retorts, furnace rollers, alloy baskets, trays, conveyor belts, carburising fixtures, and salt pot equipment.
Petrochemical & Refining: Reformer tube outlet manifolds, cracker tube hangers, catalyst support grids, and ethylene cracker internals at 850- 1050°C.
Steel & Metals Processing: Annealing furnace rolls, galvanising bath hardware, and walking beam furnace skid pipes.
Cement and Lime: Used in kiln internals and clinker coolers because they stand up to oxidation and sulphur-heavy atmospheres without breaking down.
Glass Industry: Perfect for furnace tools and annealing ovens, as it survives repeated thermal shock and rapid temperature swings.
Waste-to-Energy: Essential for incinerator grates and boiler supports, providing the durability needed to handle aggressive, waste-burning conditions.
Aerospace and Defence: Used in exhaust systems and heat shields to ensure parts keep their shape and strength under intense, cyclic heat.

Storage and Handling of ER330 TIG Welding Rod

Store in original sealed packaging at 15- 30°C, humidity below 60% RH. Keep wire away from carbon steel, copper, zinc, and low-melting-point metals; even trace carbon steel dust triggers hot cracking. Clean TIG rods with acetone before use. Use dedicated stainless steel or nylon brushes and grinding wheels. Shelf life is indefinite if stored correctly.

Available Forms, Diameters and Packaging of ER330 Filler Wire

Nicorex Alloys stocks ER330 in the forms below. All wire ships with MTC 3.1 per EN 10204. ER320LR TIG & MIG welding wires are available in the following diameters, forms and packaging:

Form	Diameters	Packaging
TIG Rod (GTAW)	1.6, 2.0, 2.4, 3.2, 4.0 mm	5 kg / 10 lb tubes, 1000 mm lengths
MIG Spool (GMAW)	0.8, 0.9, 1.0, 1.2, 1.6 mm	5 kg, 15 kg, 25 kg spools (D200/D300)
SAW Wire	1.6, 2.4, 3.2 mm	25 kg coils or spools

How to Order ER330 Welding Wire from Nicorex Alloys

Please provide the following 10 details to place an order for ER330 welding wires from Nicorex Alloys:

Wire Type - GTAW / GMAW; AWS A5.9 / ASME SFA-5.9: ER330
Size - GTAW: 1.6, 2.4, 3.2 mm cut lengths; GMAW: 0.9, 1.0, 1.2 mm spools
Current Type - GTAW: DCEN; GMAW: DCEP, 100% Ar or Ar/CO₂ shielding gas
Welding Position - All positions (1G, 2G, 3G, 4G, 6G)
Material Grade - 330; UNS N08330; W.Nr. 1.4864; EN ISO 14343-A: W 35 16
Quantity - GTAW: 5 kg packs; GMAW: 15 kg spools - specify count
Standard - AWS A5.9 / ASME SFA-5.9; EN ISO 14343-A: W 35 16; ASME Section IX
Documentation - MTC EN 10204 3.1/3.2; FN Report; TPI certificate
Packaging - GTAW: rigid plastic tubes/cardboard box; GMAW: vacuum-sealed foil bag with silica gel; ISPM 15 export cartons
Delivery Destination - Domestic / International - specify port or delivery address

Frequently Asked Questions

What is the Difference between ER330 and ER310 for Furnace Welding?

ER330 excels in carburising atmospheres because high Ni resists carbon diffusion. ER310 has 21% Ni / 26% Cr. ER310 excels at oxidising atmospheres (high Cr generates a stable oxide scale). ER330 is suitable for carbon-rich furnace gas, ER310 for air or lean combustion.

Why should ER330 not be used in High-Sulphur Environments?

The 35% nickel reacts with sulphur to form nickel sulphide (Ni₃S₂), a low-melting eutectic (~645°C) that causes intergranular attack. This is why ER330 should not be used in high-sulphur environments.

What is the Maximum Service Temperature for ER330?

980°C (1800°F) in continuous service is the maximum service temperature for ER330. Above this, oxidation resistance drops.

Is the ER330 Weld Deposit Fully Austenitic?

Yes. Nickel at 34-37% fully stabilises austenite with zero ferrite. Low heat input, stringer beads, and interpass below 121°C are mandatory.

What Spool Sizes Are Available for ER330?

The MIG wire is supplied in 12.5 kg spools in size D200 and 15 kg spools in size D300. TIG rods are supplied in sizes of 1000 mm in bundles of 5 kg. Also, 25 kg coils of SAW wire are supplied along with 3.1 Mill Test Certificates for traceability.

When Should ER330 Not Be Used?

Avoid ER330 in high-sulphur environments, for oxidation-critical service above 980°C, for standard corrosion service, or for multi-pass welds without a low-heat-input technique.