ER 209 Welding Wire

ER 209 Welding Wire Supplier — Nitronic 50W | AWS A5.9 | UNS S20980

Nicorex Alloys is an ISO 9001 and ISO 14001 certified importer, stockist, and supplier of ER209 welding wire based in Mumbai, India. We supply ER 209 TIG rods and MIG spools manufactured to AWS A5.9 / ASME SFA-5.9.

Also known as Nitronic 50W, Alloy 209 is an AWS-classified nitrogen-strengthened austenitic stainless steel filler wire, delivering a yield strength of 434 MPa (62,900 psi). ER209 (UNS S20980) carries a nominal weld deposit chemistry of approximately 22Cr-11Ni-5.5Mn-2Mo-0.20N-0.20V. Nitrogen at 0.10–0.30% and vanadium at 0.10–0.30% are the two key strengthening elements. Nitrogen interstitially locks into the austenite lattice, and it also inhibits carbon diffusion to grain boundaries, making ER209 weld deposits resistant to sensitisation (chromium carbide precipitation) in the as-welded condition. No post-weld heat treatment (PWHT) is required for intergranular corrosion (IGC) resistance. Typical all-weld-metal tensile strength reaches 700 MPa (101,500 psi) with 36% elongation and Charpy impact of 73.5 J at −20°C (54.2 ft-lbs at −4°F). TIG cut lengths are available from 1.6 to 4.8 mm, and MIG spools are available from 0.8 to 1.6 mm on 25 lb (11.3 kg) packages. Welding runs in all positions on DCEN (TIG) or DCEP (MIG).

Primary base metals include UNS S20910 (Nitronic 50) and UNS S20400 (Nitronic 30), with full compatibility for dissimilar joints to 304/316L stainless steels and GMAW overlay on mild steel. The weld deposit has little or no ferrite, so low heat input and convex bead profiles are essential to prevent hot cracking. Key industries include marine and offshore, nuclear and power generation, food and pharmaceutical processing, and cryogenic service. Every shipment carries EN 10204/3.1B mill test certificates.

ER 209 Welding Wire Specifications

The ER209 specification table below lists classification, process, diameter, spool, shielding gas, and critical process restrictions.

AWS Classification	ER209
UNS Number	S20980
Base Metal UNS	S20910 (Nitronic 50), S20400 (Nitronic 30)
Welding Processes	GTAW (TIG), GMAW (MIG)
Polarity	(GTAW): DCEN (GMAW): DCEP
Welding Positions	All (F, V, H, OH)
TIG Rod Diameters	1.6, 2.0, 2.4, 3.2, 4.8 mm
TIG Rod Length	914 mm (36″)
MIG Wire Diameters	0.8, 0.9, 1.14, 1.6 mm
MIG Spool Size	25 lb (11.3 kg)
Shielding Gas	(GTAW): 100% Argon (GMAW): 90He/7.5Ar/2.5CO₂ or 69Ar/30He/1CO₂ or 75Ar/25He
Mild Steel Overlay	GMAW only — GTAW, EB not recommended

Understanding the ER209 AWS Classification

This section decodes every element of the ER209 AWS classification, explaining each symbol and its role:

Designator	Meaning
ER	Electrode/Rod that is a bare filler for GTAW and GMAW
209	20Cr-9Mn class of nitrogen-strengthened austenitic stainless steel

UNS S20980 is the unified numbering system designation for the wire deposit. The matching SMAW electrode is E209-16 (per AWS A5.4). Compared with ER308L (18Cr-8Ni austenitic, ASME P-8), ER209 delivers roughly double the yield strength through nitrogen and vanadium additions rather than relying on cold work or precipitation hardening. Unlike ER2209 (duplex, 22Cr-5Ni-3Mo), Alloy 209 filler wire is a fully austenitic grade (They are not interchangeable despite the similar-sounding names).

Weld Deposit Chemical Composition of ER209

The chemical composition of ER209 weld deposits per AWS A5.9 is listed below. Nitrogen and vanadium are the primary strengthening elements that separate this grade from standard 300-series stainless fillers.

Specification	Carbon (C)	Silicon (Si)	Manganese (Mn)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Nitrogen (N)	Vanadium (V)	Copper (Cu)	Phosphorus (P)	Sulphur (S)
AWS A5.9 Req. (%)	0.05 max	0.90 max	4.0–7.0	20.5–24.0	9.5–12.0	1.5–3.0	0.10–0.30	0.10–0.30	0.75 max	0.03 max	0.03 max
Typical (%)	0.04	0.50	5.5	22.0	11.0	2.0	0.20	0.20	—	0.02	0.01

Nitrogen (0.10–0.30%) is interstitially in the austenite lattice, raising yield strength without compromising on ductility. It also inhibits carbon diffusion to grain boundaries, which prevents chromium carbide precipitation and makes the weld resistant to sensitisation as-welded. Vanadium (0.10–0.30%) adds further solid-solution and precipitation strengthening. Manganese at 4–7% stabilises the austenitic structure and acts as a nitrogen solubility agent, keeping nitrogen in solution during solidification.

All-Weld-Metal Mechanical Properties of ER209

ER209 all-weld-metal mechanical properties, like tensile and yield strength, elongation, and other values in the as-welded condition, are given below.

Specification	Tensile Strength	Yield Strength (0.2%)	Elongation	Charpy Impact
Typical Value	700 MPa (101,500 psi)	434 MPa (62,900 psi)	36%	73.5 J at −20°C (54.2 ft-lbs at −4°F)

ER209 delivers approximately 70% higher yield strength than ER308L and ER316L while maintaining comparable ductility. That strength-to-weight ratio reduces section thickness in fabricated components.

Base Metal Compatibility for ER209 Welding Wire

Alloy 209 filler wire is matched to nitrogen-strengthened austenitic base metals and also serves dissimilar and overlay joints.

Base Metal	UNS	P-No.	ER209 Use
Nitronic 50	S20910	P-8	Primary matching filler
Nitronic 30	S20400	P-8	Matching filler
304/304L SS	S30400/S30403	P-8	Dissimilar — higher-strength joint
316L SS	S31603	P-8	Dissimilar — higher-strength joint
321/347 SS	S32100/S34700	P-8	Dissimilar — compatible
Mild Steel (overlay)	P-1	—	Corrosion overlay; GMAW only

For direct overlay on mild steel, use the GMAW (MIG) process only. GTAW and electron beam processes are not recommended for direct ER209 application on mild steel due to dilution and cracking concerns.

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Industrial Welding Applications of ER209

Nitrogen-strengthened austenitic weld deposits from ER209 serve four primary industries where high strength, IGC immunity, and corrosion resistance are required simultaneously.

Propeller shafts, valve stems, pump components, and anchor chain fittings operate in seawater where fatigue life and chloride corrosion resistance determine service intervals.
Reactor vessel internals, fuel storage racks, and primary coolant piping components require weld metal that is resistant to intergranular corrosion without solution annealing after fabrication.
Mixing vessels, conveyor components, and processing equipment where galling resistance and FDA-compliant corrosion resistance are both required benefit from the nitrogen-strengthened austenitic deposit.
LNG storage tanks, cryogenic transfer piping, and cold boxes demand impact toughness at sub-zero temperatures alongside high strength.

Storage, Handling & Cleaning Procedures for ER 209

Store ER209 TIG rods and MIG spools in clean, dry, temperature-controlled conditions. Keep wire in original sealed packaging until ready for use. Before welding, clean the base metal and filler wire with acetone or a suitable solvent to remove oil, grease, paint, cutting fluids, and marking inks. Contaminants containing sulphur, phosphorus, or lead cause cracking and porosity.

Use dedicated stainless steel tooling only, like wire brushes, grinding wheels, and handling equipment previously used on carbon steel must not contact ER209 or its base metals. Iron contamination degrades corrosion performance. After welding, brush the weld with a stainless steel wire brush while still warm to remove oxide scale. Chemical pickling or passivation, if required, should be the final finishing operation.

Available Forms & Packaging

ER209 welding wire is stocked in 2 product forms to cover GTAW and GMAW requirements.

Form	Diameter Range	Packaging
TIG Rods (cut lengths)	1.6–4.8 mm, 914 mm (36″) length	10 lb tubes
MIG Spools	0.8–1.6 mm	25 lb (11.3 kg) spools

How to Order ER209 Welding Wire

To order ER209 nitrogen-strengthened stainless welding wire from Nicorex Alloys, provide the following details for a quotation within 24 hours:

AWS Classification (ER209)
Product Form (TIG rod, MIG spool)
Diameter (mm or inches)
Quantity (kg or number of spools/tubes)
Spool/Tube Size
Required Approvals (DNV, ABS, Lloyds, NORSOK)
Mill Test Certificate (EN 10204/3.1B)
Delivery Destination (domestic / export)

Matching consumable sets (ER209 wire + E209-16 electrode) are available on request.

Frequently Asked Questions

What is the Price of ER209 Welding Wire per Kg in India?

ER209 (Nitronic 50W) is a specialty nitrogen-strengthened grade priced higher than standard 300-series fillers like ER308L or ER316L. Contact Nicorex Alloys with your diameter and quantity requirements for a competitive quotation.

Why is ER209 Nearly Twice as Strong as ER308L in Yield Strength?

ER209 achieves ~434 MPa yield vs ~255 MPa for ER308L through nitrogen (0.10–0.30%) and vanadium (0.10–0.30%) solid-solution strengthening. Nitrogen remains interstitially in the austenite lattice, raising strength without any heat treatment.

Does ER209 Require Post-Weld Heat Treatment for IGC Resistance?

No. Nitrogen inhibits carbon diffusion to grain boundaries, preventing chromium carbide precipitation (sensitisation). ER209 welds are resistant to intergranular corrosion in the as-welded condition. This is a major advantage over standard 300-series fillers that may need solution annealing.

What is the F-Number and A-Number of ER209 Per ASME Section IX?

F-Number of ER209 is 6 (stainless steel bare wire per QW-432). A-Number is 8 (austenitic Cr-Ni-Mn weld metal per QW-442).

Is ER209 the same as Nitronic 50W?

Yes. Nitronic 50W is the trade name for ER209 (UNS S20980). The “50W” indicates it is the weld wire version of Nitronic 50 (UNS S20910) base metal.

What Shielding Gas is Recommended for GMAW with ER209?

Shielding gas options recommended for ER209 include 90%He/7.5%Ar/2.5%CO₂, 69%Ar/30%He/1%CO₂, or 75%Ar/25%He for short-circuit transfer. All use DCEP polarity. For GTAW, use standard 100% Argon with DCEN.

What is the Difference between ER209 and ER2209 Welding Wire?

Despite similar-sounding names, these are completely different alloys. ER209 (UNS S20980) is a nitrogen-strengthened austenitic stainless filler (22Cr-11Ni-5.5Mn-2Mo-0.2N). ER2209 (UNS W39209) is a standard duplex stainless filler (22Cr-8.5Ni-3Mo-0.16N). ER209 welds Nitronic base metals; ER2209 welds 2205 duplex base metals. These are not interchangeable.