ER 309 / ER 309LSi Welding Wire

OVERVIEW OF ER 309/ ER 309LSi

ER 309 / ER 309LSi welding wire is an austenitic stainless steel filler metal specially formulated for welding dissimilar metals and stainless steel to carbon steel joints. With a higher chromium and nickel content than ER 308, this grade provides excellent oxidation resistance, crack resistance, and high-temperature strength.

The ER 309LSi variant features low carbon (L) and increased silicon (Si) levels, improving weld metal fluidity, minimizing carbide precipitation, and delivering a smoother, more uniform weld bead. These wires are commonly used in MIG (GMAW) and TIG (GTAW) welding applications.

CHEMICAL COMPOSITION

Element ER 309 ER 309LSi
Carbon (C) ≤ 0.08 ≤ 0.03
Chromium (Cr) 22.0 – 24.0 22.0 – 24.0
Nickel (Ni) 12.0 – 14.0 12.0 – 14.0
Manganese (Mn) ≤ 2.0 ≤ 2.0
Silicon (Si) ≤ 0.65 0.65 – 1.00
Phosphorus (P) ≤ 0.03 ≤ 0.03
Sulfur (S) ≤ 0.03 ≤ 0.03

MECHANICAL PROPERTIES

Property Value
Tensile Strength ≥ 550 MPa
Yield Strength ≥ 400 MPa
Elongation ≥ 30%
Impact Toughness Good at both ambient and elevated temperatures

PHYSICAL PROPERTIES

Property Value
Density ~7.9 g/cm³
Melting Range 1400 – 1450°C
Electrical Conductivity Low
Magnetic Properties Non-magnetic (annealed condition)
Oxidation Resistance Excellent at high temperatures

APPLICATIONS

  • Welding stainless steel to carbon or low-alloy steel
  • Buffer layers in hardfacing applications
  • Pressure vessels and boilers
  • Power plants and thermal equipment
  • Heat-resistant steel fabrication
  • Chemical and petrochemical industries
  • Furnace parts and high-temperature components
  • Structural fabrication and repair welding

EQUIVALENT GRADES

Standard Equivalent Grade
AWS ER309 / ER309LSi
EN ISO 23 12 L Si
DIN SG X2CrNi23-12
JIS YS309 / YS309LSi
BS 309S31
GOST Sv-08Kh23N13

 

ER 309/ER 309LSi TIG Wire

ER 309/ER 309LSi MIG Wire

 

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