Stainless steel MIG welding wire is used for welding stainless steel components where corrosion resistance, weld strength, and clean bead appearance are critical. Designed for use with MIG welders and wire feed welding machines, stainless MIG wire provides stable arc performance and consistent penetration across stainless fabrication and industrial welding applications. WeldingMart supplies professional stainless steel wire for MIG welding from trusted manufacturers like Lincoln Electric in multiple diameters and spool sizes suited for fabrication shops and production welding environments.
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Lincoln Blue Max 308LSi MIG (GMAW) Stainless Steel Welding Wire
From $542.85Unit price /Unavailable
Lincoln Blue Max 308LSi MIG GMAW Stainless Steel Welding Wire
From $417.00Unit price /Unavailable
Harris 308 Stainless Steel MIG 0.035 inch GMAW Welding Alloy
From $140.01$195.00Unit price /Unavailable
Harris 308 Stainless Steel MIG 0.035 inch GMAW Welding Alloy
$147.01$204.00Unit price /Unavailable
Lincoln ER308LSi (Murex) MIG Stainless Steel Welding Wire
From $472.23Unit price /Unavailable
Harris 316LSi Stainless MIG (GMAW) Welding Wire
From $150.56$206.40Unit price /Unavailable
Harris 309LSi Stainless Steel MIG 0.035 inch GMAW Welding Alloy
From $145.01$201.60Unit price /Unavailable
Lincoln Blue Max 309LMo_MOD MIG GMAW Stainless Steel Welding Wire
From $651.75Unit price /Unavailable
Lincoln Blue Max 312 MIG GMAW Stainless Steel Welding Wire
From $667.59Unit price /Unavailable
Lincoln Blue Max 316LCF MIG GMAW Stainless Steel Welding Wire
From $719.40Unit price /Unavailable
Lincoln Blue Max 630 MIG GMAW Stainless Steel Welding Wire
From $695.64Unit price /Unavailable
Lincoln Blue Max LNT 4462 N MIG GMAW Stainless Steel Welding Wire
From $1,164.24Unit price /Unavailable
Lincoln Blue Max 320LR MIG GMAW Stainless Steel Welding Wire
From $1,325.28Unit price /Unavailable
Lincoln Blue Max 2594 MIG GMAW Stainless Steel Welding Wire
From $1,403.16Unit price /Unavailable
Lincoln Blue Max 330 MIG GMAW Stainless Steel Welding Wire
From $1,637.46Unit price /Unavailable
Lincoln Blue Max 385 MIG GMAW Stainless Steel Welding Wire
From $911.79Unit price /Unavailable
Lincoln BlueMax 308H MIG GMAW Stainless Steel Welding Wire
From $556.05Unit price /Unavailable
Harris 347 Stainless Steel MIG Welding Wire (ER347)
From $372.88$590.00Unit price /Unavailable
Harris 309LT1-1 Dynacore Stainless Flux-Cored Welding Wire
From $455.25$607.00Unit price /Unavailable
Harris 309L Stainless Steel MIG GMAW Welding Alloy
From $124.88$196.80Unit price /Unavailable
Harris 308L Stainless Steel MIG GMAW Welding Alloy
From $73.05Unit price /Unavailable
Lincoln ed035071 blue max 309L mig gmaw stainless steel welding wire, 0.035 in, 33 lb spool
$631.95Unit price /UnavailableStainless Steel MIG Wire — 308L, 309L, 316L and Duplex
Part of WeldingMart's MIG Welding Wire silo — also see Mild Steel MIG Wire, Aluminum MIG Wire.
Stainless steel MIG wire has to carry the alloy chemistry of the base metal through into the deposit, or the weld becomes the first place the part corrodes. This collection holds 85 active stainless wire products — 72 Lincoln Electric and 13 Harris — including 308L and 308LSi for 304 and 304L, 309L and 309LSi for stainless-to-carbon dissimilar joints and cladding, 316L and 316LSi for chloride and chemical service, 347 stabilised, 410 and 410NiMo martensitic, and Blue Max 2209 duplex. Match the wire classification to your base metal grade first, then pick diameter for material thickness: .030 in. and .035 in. for sheet and light gauge, .045 in. and 1/16 in. for plate and production runs.
Whether you're laying beads on food-grade processing equipment, pharmaceutical piping, marine hardware, or exhaust systems, stainless steel welding wire delivers the corrosion resistance and mechanical strength those applications demand. Browse the full collection above, or keep reading to find the exact alloy, diameter, and spool size that fits your welding process.
Top Stainless Steel Welding Wire Alloys
Not all stainless steel welding wire is the same. The alloy classification determines corrosion resistance, heat tolerance, and weld-deposit properties. Here are the grades you'll find most in our collection:
ER308L — The Workhorse of Stainless Welding Wires
ER308L is the most widely used stainless steel mig wire on the market. The "L" designation means low carbon content — typically 0.03% or less — which dramatically reduces the risk of intergranular corrosion in the heat-affected zone. ER308L is designed for welding 304 and 308 base metals, the two most common stainless steel alloys in fabrication shops and industrial facilities.
Use ER308L welding wires for:
- Food and dairy processing equipment
- Chemical storage tanks and piping
- Architectural and decorative stainless steel fabrication
- General-purpose stainless steel welding across most industries
ER316L — Superior Corrosion Resistance for Harsh Environments
ER316L stainless steel mig wire adds molybdenum to the alloy mix, which gives it excellent corrosion resistance against chlorides, acids, and marine environments where standard 304/308 wire would eventually fail. Its low carbon content equally prevents intergranular corrosion, making it the preferred filler metal for critical welds in pharmaceutical manufacturing, marine hardware, and coastal industrial facilities.
Use ER316L welding wires for:
- Marine and offshore applications
- Pharmaceutical and medical equipment
- Piping that carries chloride-containing fluids
- Chemical processing where pitting resistance is essential
ER308LSi and ER316LSi — Enhanced Fluidity Variants
The "Si" suffix means added silicon, which improves weld pool fluidity and bead wetting. These welding wires produce flatter, smoother beads with less cleanup — ideal for automated or semi-automated applications where appearance and consistency are important.
Other Types of Stainless Welding Wire in Our Catalog
Beyond the core 308L and 316L grades, our catalog includes other types such as ER309L (for joining stainless to carbon steel), ER347 (for high-temperature service), and duplex grades for specialized industrial use. Check the full collection to see every option available.
Match the Filler Metal to Your Base Metal Grade
Choosing the correct stainless steel mig wire starts with understanding the base metal you're welding. Here's a quick decision framework:
- Welding 304 or 308 stainless? Use ER308L. It's the standard filler metal for these grades and provides excellent corrosion resistance at a competitive price point.
- Welding 316 or 316L stainless? Use ER316L. The molybdenum addition ensures the weld deposit matches the corrosion resistance of the base metal.
- Joining stainless to mild steel or carbon steel? Use ER309L. Its higher chromium and nickel content bridges the metallurgical gap between the two materials.
- High-temperature service above 800°F? Look at ER347 or other stabilized grades designed for elevated-temperature resistance.
- Automated welding lines? Consider the "Si" variants for better arc stability and improved bead appearance.
Feeder, Liner, and Drive-Roll Setup
Always check your wire feeder's drive roll and liner specifications when switching diameters. Using the wrong liner and contact tip combination leads to feeding problems that compromise weld quality. The stainless MIG wire stocked here runs from 0.025 in. through 1/16 in., and the diameter-by-diameter guidance is in the selection guide further down this page.
Shielding Gas for Stainless Steel MIG Wire
Shielding gas selection is critical for stainless steel welding. The right shielding gas blend protects the weld pool from atmospheric contamination and directly affects bead appearance, arc stability, and corrosion resistance of the finished weld.
Recommended Shielding Gas Blends
Shielding gas is specified per wire and per transfer mode, not once for the whole family. For short-circuiting transfer, Lincoln and Harris publish a 90% helium / 7.5% argon / 2.5% CO₂ tri-mix on the Si-bearing stainless solid wires sold here. For axial spray transfer, Lincoln specifies 98% argon with the balance oxygen, and Harris specifies argon with 1–2% oxygen. Several Lincoln wires in this collection — including Blue Max® MIG 316L, 347, 312 and 2209 — are specified with 98% argon / 2% oxygen. Take the blend from the data sheet for the exact wire you are running.
None of the solid stainless wires in this collection is specified for straight CO₂. The one wire here specified for CO₂-bearing gas is the flux-cored Harris Dynacore® 309LT1-1, which Harris states is generally used with 100% CO₂ or an argon/CO₂ mixture, typically 75%/25%. Do not carry a mild-steel CO₂ setting across to a solid stainless wire — use the gas printed on that wire's data sheet.
Keep shielding gas coverage continuous and maintain a consistent work distance to protect the weld pool from atmospheric contamination. Set flow rate, contact-tip-to-work distance and gas blend from the manufacturer's data sheet for the specific product — those figures differ between solid, metal-cored and flux-cored wire.
Filler Metal Specifications and AWS Classifications
Every stainless steel mig wire in this collection carries an AWS (American Welding Society) classification. Most are ER-classified solid wires; the two metal-cored Primalloy® wires here are classified by Lincoln as AWS EC409 and EC439, and the Harris Dynacore® 309LT1-1 is a flux-cored T1-1 classification. Understanding these designations helps you select the correct filler metal and ensure your weld meets code or engineering requirements.
The "ER" prefix stands for Electrode or Rod — the wire can be used as either a bare electrode in MIG/GMAW or as a filler rod in TIG/GTAW applications. The number that follows (308, 316, 309, etc.) identifies the alloy composition. The "L" suffix confirms low carbon content. The "Si" suffix adds silicon for improved wetting and fluidity in the weld pool.
When a project requires certified filler metal — common in pressure vessel, aerospace, or code-compliance work — check the individual product page and confirm document availability with our team before you order. This collection is supplied by Lincoln Electric and Harris; we do not promise a certified material test report on any product until that document has been confirmed for the specific lot.
Stainless Steel Welding Tips for Better Results
Stainless steel welding requires a slightly different technique compared to mild steel. Keep these practical tips in mind:
- Control heat input. Stainless steel is a poor heat conductor. Excess heat causes warping, distortion, and sensitization in the heat-affected zone. Use stringer beads and intermittent welding technique to control heat buildup in thin sections.
- Clean the base metal. Stainless steel is sensitive to contamination. Use dedicated stainless steel brushes and clean rags — never share tools with carbon steel to avoid carbon steel contamination that causes rust.
- Match your liner and drive rolls. Stainless steel mig wire is stiffer than mild steel wire. Use a proper stainless-compatible liner — typically Teflon or nylon — and U-groove drive rolls appropriate for your wire diameter to maintain smooth feeding and consistent deposition.
- Maintain proper shielding gas coverage. Even a small gap in shielding can cause porosity and surface oxidation (sugaring) on the back side of the weld. Back purging with argon is standard on open root pipe joints.
- Match filler to base metal. Using the right stainless steel mig wire alloy for your base material is the single most important factor in achieving high quality welds that maintain corrosion resistance in service.
Stainless Steel Welding Applications
Stainless steel mig wire serves a broad range of industries where corrosion resistance, hygiene, and long service life are essential:
Food and Beverage Processing
Stainless steel fabrication dominates food-grade equipment — conveyors, tanks, mixers, and processing lines. ER308L and ER316L are the usual choices here because their low-carbon chemistry resists the intergranular corrosion that would compromise a cleanable weld surface. Confirm any regulatory or sanitary requirement against your own project specification.
Chemical and Petrochemical Processing
Piping and pressure vessel fabrication in chemical plants demands filler metals that resist aggressive media. ER316L's resistance to pitting and crevice corrosion makes it a first choice for chloride and acid service. Stainless steel welding in these environments often requires certified filler metal with full documentation.
Marine and Coastal Fabrication
Saltwater is relentless on carbon steel and even standard 304 stainless. ER316L provides the molybdenum-boosted resistance that marine hardware, boat fittings, and offshore equipment require to survive coastal and open-water environments.
Pharmaceutical and Medical
Biocompatibility and cleanability drive stainless steel use in pharmaceutical manufacturing and medical device fabrication. Low carbon content grades (ER308L, ER316L) prevent intergranular corrosion that could compromise the hygiene of the finished weld surface.
Exhaust Systems and Automotive
Stainless exhaust systems — from performance headers to aftermarket cat-back systems — use stainless steel mig wire on thin-wall tube and components where heat resistance and rust prevention are critical. The lighter diameters stocked here — 0.025 in. and 0.030 in. — and good heat control are key on this type of work. Lincoln also specifies its metal-cored Primalloy® T-409Ti and T-439Ti for single-pass welding of automotive exhaust components such as catalytic converters.
Architectural and Decorative Fabrication
Handrails, cladding, signage, and decorative panels require stainless steel welding wires that produce clean, aesthetically consistent beads. Si-grade wire variants are popular here because they improve bead wetting and reduce post-weld grinding and polishing time.
Why Buy Stainless Steel MIG Wire from WeldingMart?
WeldingMart is an authorized Lincoln Electric Elite dealer, and stocks stainless MIG wire from Lincoln Electric and Harris. We're based in Appleton, WI, and focused exclusively on the welding industry — meaning our product knowledge and support are built specifically for welders, not generalists.
- 85 stainless steel MIG wire products in this collection, in package sizes from 2 lb spools to 1000 lb reels.
- Two manufacturers — Lincoln Electric (72 products) and Harris (13 products), with the manufacturer data sheet behind every specification on this page.
- Expert support — our team understands welding applications and can help you confirm the right alloy, diameter, and spool size for your project.
Add the product you need to your cart, or contact our team if you need help confirming the right specification. We're here to make stainless steel mig wire selection fast and confident, so you can get back to welding.
Stainless Steel MIG Welding Wire — ER308L, ER309L, and ER316L for Corrosion-Critical Welds
Stainless MIG wire selection starts with base metal matching: ER308L for 304/304L, ER316L for 316/316L applications with higher chloride resistance, and ER309L for dissimilar joints between stainless and carbon steel. Using the wrong grade risks sensitization or property shortfalls in food service, chemical processing, and marine environments.
Application Guide
- Food service and sanitary equipment: ER316L on 316L base metal resists chloride pitting. Low-carbon "L" grades prevent sensitization during welding.
- Chemical processing and pressure vessels: Specify certified wire with mill test reports for code work.
- Marine: ER316L for saltwater; ER308L is acceptable for freshwater environments.
- Dissimilar metal joints: ER309L bridges stainless-to-carbon steel without cracking at the fusion zone.
Process and Setup
- Shielding gas: Tri-mix or 98% Ar/2% O₂ are standard. Avoid high CO₂ blends — they cause carbon pickup and oxidation.
- Wire diameter: 0.030–0.035 in. for most fabrication; 0.045 in. for higher-deposition structural passes.
- Contamination control: Use dedicated stainless brushes and grinding wheels to prevent carbon steel contamination.
Browse all wire types in the parent MIG Welding Wire collection. For gun and torch equipment, see MIG Welding Guns. WeldingMart ships Lincoln Electric Blue Max stainless wire from Wisconsin.
Have more questions? See the FAQ below for guidance on ER308L vs. ER316L, shielding gas blends, and low-carbon "L" grade importance.
Choosing Stainless MIG Wire by Alloy, Diameter, and Package
Most stainless MIG wire selection comes down to four decisions: the alloy that suits the joint, the wire diameter your gun and joint thickness can run, the package size that fits your duty cycle, and the shielding gas the wire's manufacturer specifies. The stainless steel MIG welding wire in this collection is supplied by Lincoln Electric and Harris, and every alloy below links to the matching product page.
Match the alloy to the joint
Alloy choice drives corrosion resistance and crack resistance far more than brand does. The descriptions below are the manufacturers' own stated applications for the specific wires sold here.
- 308L / 308LSi — Lincoln states Blue Max® MIG 308LSi is a versatile electrode designed to weld CrNi austenitic stainless steels and is used primarily to weld equipment made with 304 type stainless steel, with higher silicon for improved wetting and potentially higher travel speeds than standard 308L products. Harris lists its 308LSi for base metals of similar composition such as 201, 202, 301, 302, 304, 305 and 308, including the L series. See Lincoln Blue Max 308LSi and Harris 308L.
- 309L / 309LSi — Lincoln states Blue Max® MIG 309L is ideal for joining stainless steels to themselves or to carbon or low alloy steels and can be used at temperatures up to 700°F (371°C); the 309LSi grade is described as designed for joining stainless steel to mild or low alloy steel. This is the usual choice for dissimilar-metal joints. See Lincoln Blue Max 309L and Harris 309L.
- 316L / 316LSi — Lincoln states the 2–3% molybdenum in Blue Max® MIG 316L improves pitting corrosion resistance of the weld deposit and that its low carbon content reduces the possibility of carbide precipitation and intergranular corrosion, with typical applications in power generation and chemical and petrochemical processing. Harris lists its 316L for molybdenum-bearing alloys and similar alloys containing 0.03% maximum carbon. See Lincoln Blue Max 316LSi and Harris 316L.
- 347 — Lincoln states the niobium addition in Blue Max® MIG 347 reduces intergranular corrosion in severe operating conditions, with typical applications in high temperature stainless work, pharmaceutical equipment, food processing, and welding 321 and 347 type stainless and stainless clad steels. Harris lists its 347 for base metals of similar composition such as 347 and 321. See Lincoln Blue Max 347 and Harris 347.
- 312 — Lincoln states Blue Max® MIG 312 weld deposits exhibit high tensile strength and offer some resistance to abrasion, that applications should be limited to 800°F (420°C), and lists tool steels, hard to weld steels, cast and wrought alloys, and dissimilar metals as typical applications. A common pick for repair and maintenance work on unknown or difficult steels. See Lincoln Blue Max 312.
- 2209 duplex — Lincoln states Blue Max® MIG 2209 welds offer excellent resistance to stress corrosion, cracking and pitting, that the weld metal microstructure consists of austenite and ferrite, and lists welding 2205 duplex stainless steel plus offshore, oil and gas, chemical, and petrochemical applications. See Lincoln Blue Max 2209.
- 410NiMo — Lincoln states Blue Max® MIG 410NiMo is used to overlay mild and low alloy steels, that a preheat and inter-pass temperature of 300°F (150°C) or greater is recommended during welding, and that post-weld heat treatment should not exceed 1150°F (620°C) because higher temperatures may result in hardening. See Lincoln Blue Max 410NiMo.
The "L" in 308L, 309L, and 316L marks a low carbon grade. Lincoln states that reduced carbon levels of 0.03% maximum offer increased resistance to inter-granular corrosion, which is why low carbon stainless steel welding wire is the default for corrosion-critical fabrication. An "Si" suffix on the same alloy means higher silicon: Lincoln describes 309LSi as the same composition as 309L with higher silicon content to improve bead appearance and increase welding ease, and Harris notes higher silicon contents improve the wetting and washing behavior of the weld metal.
Pick a wire diameter that suits the joint and the gun
Stainless steel MIG wire in this collection is offered in 0.025 in., 0.030 in., 0.035 in., 0.040 in., 0.045 in., and 1/16 in. diameters, though not every alloy is offered in every size. Thinner wire suits sheet and light gauge work; larger diameters carry more current for heavier plate and higher deposition. Amperage and voltage ranges are diameter-specific: Harris publishes short-circuiting parameters of 60–125 A at 17–22 V for 0.030 in. wire, 75–160 A for 0.035 in., and 100–200 A for 0.045 in., and spray-transfer ranges that run considerably higher. Confirm the range on the data sheet for the exact wire you buy, and check that your gun liner and contact tip are sized for the diameter.
Choose a spool or bulk package to match run length
Package size is a downtime decision. This collection carries 2 lb, 10 lb, 25 lb, 33 lb, and 44 lb spools for shop and field work, plus bulk formats for high-volume production: 250 lb, 500 lb, and 750 lb drums, 10 lb and 500 lb boxes, and 500 lb and 1000 lb reels. A 10 lb spool suits occasional repair work and small machines; production cells changing spools several times a shift are the case for bulk. Manufacturer product codes differ by package, so verify the code on the product page against your purchasing records.
Set shielding gas from the wire's data sheet
None of the solid stainless wires in this collection is specified for straight CO2: Lincoln and Harris publish either a 90% helium / 7.5% argon / 2.5% CO2 tri-mix for short-circuiting transfer or an argon-oxygen mix for spray transfer. For Blue Max® MIG 308LSi, 309LSi, and 316LSi, Lincoln specifies 90% helium / 7.5% argon / 2.5% CO2 for short circuiting transfer and 98% argon with the balance oxygen for axial spray transfer. For Blue Max® MIG 316L, 347, 312, and 2209, Lincoln specifies 98% argon / 2% oxygen. Harris publishes the same 90% helium + 7.5% argon + 2.5% CO2 tri-mix for short-circuiting transfer on its 308LSi, 309LSi, 316L, and 347 wires, and argon with 1–2% oxygen for spray transfer. Take the gas from the data sheet for the specific wire rather than applying one mix across the whole family.
Solid, metal-cored, and flux-cored wires are set up differently
Most of this collection is solid GMAW wire, but not all of it. Harris Dynacore® 309LT1-1 is flux-cored and runs on a different gas: Harris states this material is generally used with 100% CO2 or a mixture of argon and CO2, typically 75%–25%, with recommended wire stick out of 5/8 in. to 3/4 in. Harris lists it for joining dissimilar steels and materials of AISI 309 composition, and recommends it as a first layer in single or multilayer surfacing of non-alloy and low alloy steels to give a 304L deposit.
Lincoln's Primalloy® T-409Ti and Primalloy® T-439Ti are metal-cored (GMAW-C) wires, classified by Lincoln as AWS EC409 and EC439 respectively. Lincoln specifies 98% argon / 2% oxygen for both, gives a 5/8 in. contact-tip-to-work distance for T-409Ti, and lists both as designed for joining components of automotive exhaust systems such as catalytic converters, in single pass welding. Take gas and stickout from the data sheet for the exact product, not from the solid-wire settings.
Related welding wire and MIG equipment
- All MIG welding wire — solid and flux-cored spools across alloys.
- Mild steel MIG wire — ER70S-6 and ER70S-3 for carbon steel work.
- Aluminum MIG wire — 4043, 5356, and 5556.
- Welding wire and filler metals — MIG, TIG, and stick consumables, including stainless welding wire for other processes.
- MIG welding guns — check liner and contact tip sizing against your wire diameter.
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