Alloy 309LMo SAW & Flux

AWS A5.9 ER309LMo SAW Wire & Flux Supplier in Mumbai, India

Name: Alloy 309LMo SAW & Flux
Brand: Nicorex Alloys

Nicorex Alloys is an ISO 9001 and ISO 14001 certified supplier and stockist of ER309LMo SAW wire and flux in Mumbai, India. We import this molybdenum-enhanced 309LMo stainless steel submerged arc welding consumable for dissimilar joints and corrosion-resistant overlay on carbon steel substrates in accordance with AWS A5.9..

ER309LMo filler wire is a special grade of stainless steel filler wire classified as UNS S30986 as per the AWS A5.9. High chromium (23-25%), nickel (12-14%), and molybdenum (2.0-3.0%) help stop halide pitting. This grade provides reliability as a protective buffer layer whenever the need arises to clad carbon steel for industrial use.A high-alloy filler, ER309LMo is composed of 23% chromium, 13% nickel, and 2.5% molybdenum to name its constituent elements. CRA cladding and dissimilar junctions are the primary applications for this material in the oil and gas and chemical industries. It performs an effective compensatory function for base metal dilution, so ensuring that critical corrosion resistance is maintained.

ER309LMo welding wires are typically available in diameters ranging from 0.8mm to 1.2mm for MIG and 1.6mm to 3.2mm for TIG rods. This particular wire is compatible with both agglomerated and fused flux types, and the chemistry of the flux has a direct impact on the composition of the deposit, the amount of ferrite present, and the corrosion performance. ER309LMo SAW wire with suitable flux is available for purchase from Nicorex Alloys. This wire is backed by mill test certifications that comply with EN 10204-3.1 and has full heat-lot traceability.

ER309LMo SAW Welding Wire & Flux Specification

Check this comprehensive guide for ER309LMo SAW wire and flux specifications, including AWS, UNS, and other required information

Wire Specification

AWS	ER309LMo A5.9
ASME	SFA-5.9 (BPVC Section II Part C)
UNS	S30986
Form	Solid bare wire (continuous electrode for SAW)

Flux Specification

No dedicated AWS classification covers stainless steel SAW flux. Both agglomerated and fused flux types pair with ER309LMo. Agglomerated flux can add alloying elements but is moisture-sensitive; fused flux cannot adjust chemistry but offers greater batch consistency. The wire-plus-flux pairing must be qualified per ASME Section IX or ISO 15614-1.

What Does ER309LMo Mean? - AWS A5.9 Classification Explained

Understand the AWS A5.9 classification to learn how each element in ER309LMo enhances your specific welding project performance.

Prefix/Designator	Meaning & Technical Significance
E	Electrode: Indicates the filler metal can conduct electricity in the welding arc.
R	Rod: Suitable as a filler rod for TIG (GTAW) or a wire for MIG (GMAW) processes.
309	23Cr-12Ni Base: High alloy content designed for joining stainless to carbon steel.
L	Low Carbon: Maximum 0.03% C to prevent carbide precipitation and corrosion.
Mo	+ Molybdenum: Added 2.0–3.0% Mo for superior resistance to pitting.

ER: dual use as electrode (GMAW, SAW) and rod (GTAW). 309: higher Cr and Ni than 308 or 316, compensating for overlay dilution. L: low carbon (0.03% max), preventing sensitisation.

Mo: 2.0–3.0% molybdenum for pitting resistance in chloride and halide environments, the key differentiator from standard ER309L.

Chemical Composition of ER309LMo (AWS A5.9)

Examine the precise chemical composition of ER309LMo to confirm that its qualities suit your project’s stringent metallurgical criteria.

Material / Element	Carbon (C)	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Manganese (Mn)	Silicon (Si)	Phosphorus (P)	Sulphur (S)	Copper (Cu)	Iron (Fe)
Weight %	0.03 max	23.0–25.0	12.0–14.0	2.0–3.0	1.0–2.5	0.30–0.65	0.03 max	0.03 max	0.75 max	Balance

Cr at 23–25% and Ni at 12–14% compensate for 10–50% dilution from carbon steel, yielding approximately 16–18% Cr and 8–10% Ni at the deposit surface – matching 316L. Mo at 2.0–3.0% provides pitting resistance that standard ER309L lacks. Low C (0.03% max) prevents intergranular carbide precipitation. In SAW, flux chemistry affects final deposit composition, so MTC deposit analysis may differ from wire analysis.

Mechanical Properties of ER309LMo Weld Deposit

Check the following parameters for mechanical strength and durability to be sure that ER309LMo fits your needs:

Property	Ultimate Tensile Strength	Yield Strength, 0.2% Offset	Elongation	Ferrite Number (FN)
Typical Value (As-Welded)	550–620 MPa (80–90 ksi)	380–480 MPa (55–70 ksi)	28–38%	6–18 FN (varies with flux, dilution, parameters)

A minimum of 3–5 FN prevents solidification hot cracking. Above 20 FN, corrosion resistance drops, and the sigma phase may form at 550–900°C service temperatures. Flux chemistry influences ferrite; agglomerated flux can shift FN up or down. Batch-specific data is reported on EN 10204-3.1 MTC.

Base Metals Compatible with ER309LMo SAW Wire

Identify the best base metal pairings for ER309LMo to achieve flawless transitions between stainless and carbon steel components.

Base Metal / Scenario	Typical Application
Carbon steel to 316/316L SS	Dissimilar joint – ER309LMo as transition filler
Carbon steel CRA overlay	First-layer overlay achieving 316L-equivalent surface after dilution
Low-alloy steel to austenitic SS	Dissimilar joints in pressure vessels and heat exchangers
Cr-Mo steel (P11, P22) to austenitic SS	Dissimilar joints in power generation
304/304L SS to carbon steel	Dissimilar joint with Mo-enhanced corrosion resistance
Clad plate weld restoration	Rejoining Mo-bearing SS clad layers to CS substrate
Buffer / butter layer	Before applying ER316L, ER317L, or ER347 in subsequent passes

For multi-layer overlays, the first layer is of ER309LMo, with the subsequent layers of ER316L or ER317L.

Recommended SAW Welding Parameters for ER309LMo

Utilise these optimised welding parameters to achieve deep penetration and consistent bead appearance with ER309LMo submerged arc applications.

Diameter	Position	Wire Feed (ipm)	Current (A)	Voltage (V)	CTWD
0.9 mm (0.035″)	Flat / Horizontal	365	130–140 A	24–25 V	13–19 mm
0.9 mm (0.035″)	Vertical-Up	310	110–120 A	22–23 V	13–19 mm
1.2 mm (0.045″)	Flat / Horizontal	215–550	140–380 A	23–35 V	13–25 mm
1.2 mm (0.045″)	Overhead	425	175–195 A	25–27 V	16–19 mm
1.6 mm (1/16″)	Flat / Horizontal	125–615	150–410 A	24–36 V	16–32 mm
1.6 mm (1/16″)	Vertical-Up	220	190–210 A	25–26 V	16–19 mm

AC polarity reduces penetration and dilution, benefiting single-layer overlay. If PWHT is required, ferrite may convert to sigma phase in the 550–900°C range.

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Industries and Applications of ER309LMo SAW Wire & Flux

The following are the industrial applications of ER309LMo SAW Wire & Flux

Oil & Gas: Creates corrosion-resistant overlays on pressure vessels and manifolds for sour and chloride service.
Petrochemical: Clads reactor vessels and heat exchangers to provide 316L-equivalent protection on carbon steel.
Chemical Processing: Protects vessels handling organic acids and chloride-bearing solutions from localized pitting.
Power Generation: Used for boiler drum overlays and joining dissimilar metals like Cr-Mo to stainless steel.
Pulp & Paper: It protects digesters and bleach plant equipment from severe chemical recovery operations.
Offshore / Marine: Coats subsea equipment and seawater-exposed structures to prevent saltwater degradation.
Clad Plate Fabrication: Essential for the restoration and repair of the bond zone in 316L-clad steel plates.

Storage and Handling of ER309LMo SAW Wire & Flux

Agglomerated flux is hygroscopic: store sealed at relative humidity below 50% and rebake per manufacturer instructions (typically 250–350°C, 1–2 hours) if exposed to moisture. Fused flux is less sensitive but should remain dry. Discard flux showing clumping or caking. Store wire in original sealed packaging, in a dry area free of oil and condensation. Handle with clean, dry gloves.

ER309LMo SAW Wire Sizes & Packaging

Browse available wire diameters and packaging weights to select the right ER309LMo supply for your high-volume production needs.

Form	Diameter / Size	Packaging
SAW Wire	2.0 mm (5/64″)	Spool: 12.5 kg, 15 kg, 25 kg
SAW Wire	2.4 mm (3/32″)	Spool: 12.5 kg, 15 kg, 25 kg
SAW Wire	3.2 mm (1/8″)	Coil / Drum: 100 kg, 250 kg
SAW Wire	4.0 mm (5/32″)	Coil / Drum: 100 kg, 250 kg
Strip (cladding)	0.5 × 60 mm	On request – single-layer strip cladding

How to Order ER309LMo SAW Wire & Flux from Nicorex Alloys

To place an order for ER309LMo SAW Wire & Flux from Nicorex Alloys, provide these 12 details:

AWS Classification and UNS - ER309LMo / UNS S30986
Product Form - SAW wire, SAW strip, flux, or wire + flux combination
Wire Diameter / Strip Size - 2.0, 2.4, 3.2, 4.0 mm wire or 0.5 × 60 mm strip
Flux Type - agglomerated or fused
Spool / Coil / Drum Packaging - weight and type
Applicable Standard - AWS A5.9 / ASME SFA-5.9 or project specification
Base Metal Application - CS overlay, dissimilar CS-to-SS joint, clad plate
Target Ferrite Number - if specified by project
Quantity - kg or number of packages
Documentation - EN 10204-3.1 MTC, CoC, SDS, batch test certificate
Additional Requirements - PMI, ferrite verification, moisture-sealed packaging
Packaging and Delivery Destination - sealed export or domestic; city/port

Frequently Asked Questions

What is the difference between ERNi-CI and ERNiFe-CI for Cast Iron Welding?

Both are 23Cr-12Ni austenitic stainless steel fillers, but ER309LMo adds 2.0–3.0% Mo for pitting and crevice corrosion resistance. ER309L contains no Mo. Use ER309LMo when the overlay must match 316L corrosion performance.

Can ERNi-CI Wire be used for MIG Welding Cast Iron to Mild Steel?

ER309LMo is over-alloyed at 23Cr-12Ni vs ER316L at 16Cr-10Ni. With 10–50% dilution from carbon steel, ER309LMo still delivers 316L-equivalent chemistry at the surface. ER316L directly on carbon steel would produce an under-alloyed, crack-prone deposit.

Should i use Agglomerated or Fused Flux for ER309LMo SAW?

Agglomerated flux can adjust deposit chemistry but needs moisture control. Fused flux is chemically consistent and less hygroscopic. Selection depends on ferrite target and storage capability.

What is the Maximum Interpass Temperature for ER309LMo SAW?

175°C per standard austenitic stainless steel practice.

Can ER309LMo SAW Be Used for Overlay in Sour Service per NACE MR0175?

Yes. ER309LMo first layer plus ER316L subsequent layers is a standard overlay sequence for NACE MR0175 / ISO 15156 compliant vessels.

What Documentation Does Nicorex Provide with ER309LMo SAW Wire?

EN 10204-3.1 mill test certificate, Certificate of Conformance, Safety Data Sheet, and batch test certificate with chemical analysis and ferrite verification where applicable.