HYW ER309LSi High-Silicon Stainless Steel MIG Welding Wire
HYW ER309L stainless MIG welding wire 2 lb spool

HYW ER309L Stainless Steel MIG Welding Wire

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HYW ER309L Stainless Steel MIG Welding Wire is a low-carbon (L) austenitic stainless MIG wire (23% Cr / 13% Ni) engineered for dissimilar-metal joints and overlay work. Its higher alloy content makes it the standard choice for joining stainless to carbon or low-alloy steel and for buffer / cladding layers, while the low carbon level guards against intergranular corrosion.

Key Features

  • › Low-carbon (L) chemistry minimizes carbide precipitation and intergranular corrosion
  • › High-silicon formulation for smooth wetting, a stable arc and reduced spatter
  • › Bright, clean, X-ray quality welds with easy slag / oxide cleanup
  • › Precision-wound layer spools for consistent, tangle-free feeding

Ideal Applications

  • › Joining stainless steel to carbon or low-alloy steel (dissimilar joints)
  • › Buffer / first-layer cladding and overlay welding
  • › Welding 309 / 309S stainless base metals
  • › Heat- and corrosion-resistant fabrication
  • › Repair and maintenance of mixed-metal assemblies

Technical Specifications

AWS Classification AWS A5.9 / A5.9M ER309L
Tensile Strength 85,000 psi (586 MPa) typical (as-welded)
Wire Type Solid low-carbon austenitic stainless steel (23% Cr / 13% Ni)
Process MIG / MAG (GMAW)
Polarity DC+ (DCEP / reverse polarity)
Shielding Gas 98% Ar / 2% O₂, or tri-mix (90% He / 7.5% Ar / 2.5% CO₂) for short-circuit
Packaging 2 lb & 25 lb plastic spools (single rolls and multi-roll packs)

Typical Chemical Composition

Typical filler-wire analysis (wt %). Single values are maximums; iron is the balance.

Element Typical Wire (wt %)
Carbon (C) 0.03 max
Chromium (Cr) 23.0 – 25.0 (typ. 24.0)
Nickel (Ni) 12.0 – 14.0 (typ. 13.0)
Manganese (Mn) 1.0 – 2.5 (typ. 1.8)
Silicon (Si) 0.30 – 0.65 (typ. 0.45)
Molybdenum (Mo) 0.75 max
Phosphorus (P) 0.03 max
Sulfur (S) 0.03 max
Copper (Cu) 0.75 max
Iron (Fe) Balance

Mechanical Properties

Typical as-welded all-weld-metal properties; values meet or exceed AWS A5.9 minimums.

Tensile Strength typ. 88,000 psi (605 MPa)
Yield Strength (0.2% offset) typ. 60,000 psi (415 MPa)
Elongation (2 in / 50 mm) typ. 38%
Ferrite Number (FN) 8 – 15 typical

Available Sizes & Recommended Amperage

Diameter Recommended Amperage
.030" (0.8 mm) 40 – 145 A
.035" (0.9 mm) 50 – 180 A
.045" (1.2 mm) 75 – 350 A

Recommended amperage ranges are general guidelines; optimal settings vary with base-metal thickness, joint design, shielding gas, and welding position. Store wire in a dry location to prevent oxidation and ensure smooth feeding.

⚠ WARNING: This product and the fumes and gases produced when welding it can expose you to chemicals including nickel and hexavalent chromium compounds, which are known to the State of California to cause cancer, and manganese, which is known to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
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