ER316LMN Welding Wire
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ER316LMN Welding Wire Supplier - Zero-Ferrite Cryogenic Stainless Filler | AWS A5.9 | UNS S31682
Nicorex Alloys is an ISO 9001 and ISO 14001 certified, Mumbai-based supplier and stockist of ER316LMn welding wire, classified under AWS A5.9 / ASME SFA-5.9 with the UNS designation S31682 and Werkstoff Nr. 1.4404. Make it the lowest-ferrite classification in AWS A5.9. Standard ER316L deposits around 5 FN.
The wire carries a nominal chemistry of ~21% Cr, ~16.5% Ni, ~3.15% Mo, ~7% Mn, and ~0.19% N with carbon held to 0.03% max. High manganese at 5-8%. The high manganese content keeps the weld metal fully austenitic and essentially ferrite‑free, which is critical for toughness at cryogenic temperatures. While nitrogen at 0.10-0.20% adds solid-solution strengthening that pushes tensile strength to 690 MPa (100 ksi), which is roughly 21% higher than ER316L. Cryogenic impact toughness holds at 25 ft-lbs at -213°C (-350°F) and 15 mils lateral expansion at -269°C (-452°F). Compatible processes include GTAW, GMAW, and SAW for welding 316L, 304L, 201, and 3% and 9% nickel steels in LNG and cryogenic service. The wire also serves urea synthesis plants, where ammonium carbamate corrodes delta ferrite, and non-magnetic applications where zero magnetic permeability is required.
Sold commercially as OK Autrod 316LMN (ESAB), Ugiweld 4455, and Midalloy ER316LMn, the wire ships in TIG rods (2.4 and 3.2 mm), MIG spools (0.9 and 1.14 mm), and SAW coils. Every shipment from Nicorex Alloys includes EN 10204/3.1B mill test certificates with recorded ferrite measurements from our ISO 9001 and ISO 14001 certified facility.
ER316LMn Welding Wire Specifications
The following table briefly provides ER316LMn filler wire standards, process parameters, dimensions, and other required details.
| Applicable Standard | AWS A5.9 / ASME SFA-5.9 |
|---|---|
| UNS Designation | S31682 |
| SAW Wire Diameter | 2.4, 3.2 mm (3/32″, 1/8″) |
| Shielding Gas (GTAW) | 100% Argon |
| Shielding Gas (GMAW – Short Arc) | 69% Ar / 30% He / 1% O₂ |
| Shielding Gas (GMAW – Spray) | 92% Ar / 8% CO₂ or 98% Ar / 2% O₂ |
| SAW Flux | Record IND 24 or IND 27 |
| Welding Positions | All positions |
Understanding the ER316LMn AWS Classification
| Designator | Meaning |
|---|---|
| ER | Electrode / Rod suitable for both MIG (GMAW) and TIG (GTAW) processes |
| 316 | 18Cr–12Ni–2Mo base alloy providing high corrosion resistance |
| L | Low Carbon (≤0.03%) to minimise carbide precipitation and prevent intergranular corrosion |
| Mn | High Manganese (~7%) for fully austenitic, ferrite-free weld and cryogenic toughness |
| N | Nitrogen addition for solid-solution strengthening and higher tensile loads |
ER316LMn (UNS S31682) is a low-carbon, manganese-enhanced austenitic stainless steel wire. Its high manganese content (~7%) eliminates delta ferrite, while nitrogen additions provide a superior 690 MPa tensile strength, making it distinct from standard ER316L.
Weld Deposit Chemical Composition of ER316LMn
Chemical composition of AWS A5.9 ER316LMn is detailed below. High manganese (5-8%) and nitrogen ensure zero ferrite and austenite stability.
| Specification | Carbon (C) | Silicon (Si) | Manganese (Mn) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) | Nitrogen (N) | Copper (Cu) | Niobium (Nb) | Phosphorus (P) | Sulphur (S) | Ferrite Number |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Requirement (wt%) | 0.03 max | 1.00 max | 5.0–8.0 | 19.0–22.0 | 15.0–18.0 | 2.5–3.5 | 0.10–0.20 | 0.75 max | 0.10 max | 0.03 max | 0.03 max | — |
| Actual (%) | 0.012 | 0.44 | 7.03 | 21.0 | 16.50 | 3.15 | 0.186 | 0.068 | 0.005 | — | — | 0.5 FN max |
Chromium (19-22%) and nickel (15-18%) are both higher than standard ER316L (18-20% Cr, 11-14% Ni) to maintain pitting corrosion resistance despite the reduced ferrite. Molybdenum at 2-4% exceeds the ER316L range of 2-3%, adding further resistance to chloride pitting.
All-Weld-Metal Mechanical Properties of ER316LMn
Mechanical properties of ER316LMn all-weld-metal in the as-welded condition, along with cryogenic impact data, are listed below.
| Property | Tensile Strength | Yield Strength (0.2% Offset) | Elongation | Impact at -196°C (-320°F) | Impact at -213°C (-350°F) | Impact at -269°C (-452°F) |
|---|---|---|---|---|---|---|
| Value | 690 MPa (100,000 psi) | 434 MPa (63,000 psi) | >30% | 35–38 mils lateral expansion | 25 ft-lbs | 15 mils lateral expansion |
Base Metal Compatibility
ER316LMn filler wire is qualified for welding the following base metals and dissimilar combinations.
| Base Metal | UNS | P-No. | ER316LMn Use |
|---|---|---|---|
| 316L / 316 | S31603 / S31600 | P-8 | Matching filler for corrosion-resistant welds |
| 304L / 304 | S30403 / S30400 | P-8 | Cryogenic service and general fabrication |
| 201 | S20100 | P-8 | Mn-austenitic stainless steel welding |
| 3% Nickel Steel | K31940 (Typical) | P-9A | Cryogenic storage (LNG/LPG tanks) |
| 9% Nickel Steel (A553/A353) | K81340 / K81341 | P-11A Grp 1 | Critical cryogenic joints in LNG tanks |
| Carbon Steel to Stainless Steel | — | — | Dissimilar welding and overlay cladding |
| Urea-Grade Stainless Steel | Various | — | Urea synthesis and corrosion-resistant applications |
The 9% nickel steel application is particularly important. ER316LMn is one of the few stainless filler wires qualified for joining ASTM A553 and A353 steels in LNG storage tank construction, where the weld must maintain impact toughness well below -196°C.
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Industrial Welding Applications of ER316LMn Filler Metal
The following are the industrial applications of ER316LMn welding wire
- In cryogenic systems, this wire eliminates the risk of brittle fractures by maintaining a zero-ferrite structure, ensuring superior toughness and impact strength at extreme sub-zero temperatures.
- For urea synthesis reactors and carbamate condensers, its zero-ferrite composition prevents ammonium carbamate solutions from creating corrosion micro-channels, meeting strict licensing requirements for chemical processing.
- In medical and scientific facilities, such as MRI rooms and particle accelerators, it provides weld deposits with zero magnetic permeability, essential for sensitive magnetic measurement equipment.
Available Forms & Packaging
ER316LMn filler wire is stocked in the following product forms, diameters, and packaging options:
| Form | Diameter Range | Packaging |
|---|---|---|
| TIG Rod (Cut Length) | 2.4, 3.2 mm (3/32”, 1/8”) | 10 lb tubes / 60 lb cartons |
| MIG Spool Wire | 0.9, 1.14 mm (0.035”, 0.045”) | 30 lb spools |
| SAW Coil | 2.4, 3.2 mm (3/32”, 1/8”) | 60 lb coils |
How to Order ER316LMN Welding Wire from Nicorex Alloys
To place an order for ER316LMn welding wire, provide the following details:
- AWS Classification: ER316LMn
- Form: TIG rod, MIG spool, or SAW coil
- Diameter (mm or inches)
- Quantity (kg, lb, or number of spools/coils)
- Spool size preference
- Required approvals (if any)
- EN 10204/3.1B MTC required (Yes/No)
- Ferrite measurement confirmation (≤0.5 FN)
- Delivery destination (domestic/export)
Frequently Asked Questions
What is the Price of ER316LMn Welding Wire per Kg in India?
ER316LMn is a speciality zero-ferrite cryogenic filler priced above standard ER316L due to its higher nickel, manganese, and nitrogen content. Contact Nicorex Alloys for current pricing and bulk discounts.
What is the Difference between ER316LMn and ER316L?
ER316LMn’s composition of ~7% Manganese and ~0.19% Nitrogen ensures a 0.5 FN maximum ferrite level for essential applications. It is designed for cryogenic service down to -269°C and high-pressure urea plant conditions with more Chromium (21%), Nickel (16.5%), and Molybdenum (3.15%) than regular ER316L.
Why is Zero Ferrite Important for Cryogenic Welding?
Because delta ferrite undergoes a brittle transition at cryogenic temperatures, even standard levels can cause fractures. By maintaining a 0.5 FN maximum, ER316LMn removes these initiation sites, allowing for safe service down to -269°C (-452°F).
Can ER316LMn Weld 9% Nickel Steel for LNG Service?
Yes. ER316LMn is one of the primary fillers for joining 9% nickel steel (ASTM A553/A353) in LNG tank construction.
Why do Urea Plants Require Zero-Ferrite Welding Wire?
In urea synthesis, ammonium carbamate solutions preferentially corrode ferrite, creating micro-channels that lead to stress corrosion cracking. The zero-ferrite structure of ER316LMn eliminates this attack vector, meeting the strict mandates of major urea process licensors.
What is the ESAB Trade Name for ER316LMn?
OK Autrod 316LMN is the ESAB designation for this wire.